A wireless signal direction finding method and related apparatus

Abstract

The application provides a wireless signal direction finding method and related equipment, which utilizes an antenna array sharing a radio frequency link, and effectively avoids the high cost caused by separately configuring radio frequency and digital circuits for each channel through sharing a radio frequency front end and a digital signal processing link. Although a large number of antenna units are used, the cost of a single antenna unit can be greatly reduced after mold forming, so that the overall hardware cost is greatly optimized under the premise of ensuring performance. The scheme can simultaneously support wireless signal sensing and direction finding in low, medium and high full-band ranges, overcoming the limitation that the traditional direction finding system is usually limited to specific frequency bands. This feature significantly improves the application range and environmental adaptability of the system, meeting the monitoring and positioning requirements in multiple frequency bands and multiple scenarios.

Description

Technical Field

[0001] This application relates to the field of wireless signal monitoring technology, and in particular to a wireless signal direction finding method and related equipment. Background Technology

[0002] In practical applications, various wireless communication systems exist in industry scenarios, including navigation glide slope signals used to guide aircraft takeoff and landing, LTE private network signals supporting intelligent personnel dispatch, AeroMACS signals providing high-speed interconnection services, and WiFi signals used for the Internet of Things and wireless access. These wireless signals cover a wide frequency band from 100MHz to 6GHz, are easily interfered with, and are difficult to locate. Once interfered with, it can affect industry operational efficiency at best, and may even cause safety incidents at worst.

[0003] The industry currently faces diverse types of wireless interference, such as interference from drone countermeasure systems, specific frequency band interference from devices like lawnmowers, interference from radio signals from neighboring countries, and interference from illegally set up private radio stations. This type of interference is typically characterized by its sudden onset, wide frequency band distribution, large affected area, and unpredictable signal direction, posing significant challenges to interference troubleshooting.

[0004] Traditional interference monitoring methods mainly rely on manual inspection using spectrum analyzers and directional antennas. This approach is not only inefficient but also struggles to detect sporadic interference in a timely manner. Furthermore, it is difficult to achieve full-band, real-time, and efficient spectrum monitoring and interference localization. Therefore, there is an urgent need for a wireless signal direction-finding device and method that supports the entire frequency band, is cost-effective, and can accurately determine the direction of interference and record spectral characteristics, in order to achieve rapid detection, localization, and handling of wireless interference. Summary of the Invention

[0005] This application aims to at least solve one of the aforementioned technical defects. In view of this, this application provides a wireless signal direction finding method, apparatus, device, and readable storage medium to solve the technical defect of difficulty in efficiently monitoring wireless signals in the prior art.

[0006] A wireless signal direction finding method includes: deploying at least two wireless signal direction finding devices in a target area based on wireless signal information to be monitored in the target area, and constructing an antenna array of a shared radio frequency link for each wireless signal direction finding device in the target area; acquiring wireless signals in the target area across the entire frequency band through the antenna array of the shared radio frequency link of each wireless signal direction finding device; and analyzing the wireless signals in the target area across the entire frequency band acquired by all wireless signal direction finding devices to determine relevant information of target interference signals in the target area.

[0007] Preferably, based on the wireless signal information to be monitored in the target area, at least two wireless signal direction finding devices are deployed in the target area, and an antenna array for a shared radio frequency link of each wireless signal direction finding device in the target area is constructed. This includes: determining the number of wireless signal direction finding devices to be deployed in the target area based on the wireless signal information to be monitored in the target area; setting the parameters of each wireless signal direction finding device in the target area based on the parameters of all operating wireless signals in the target area; constructing a low-frequency antenna array, an intermediate-frequency antenna array, and a high-frequency antenna array for the shared radio frequency link of each wireless signal direction finding device based on the parameters of all operating wireless signals in the target area and the parameters of each wireless signal direction finding device; wherein, the number of antennas in each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device is set according to the size of the antenna array in each frequency band; the number of low-frequency antenna arrays is a preset first threshold, the number of intermediate-frequency antenna arrays is a preset second threshold, and the number of high-frequency antenna arrays is a preset third threshold. The third threshold is set; the coverage area formed by the antenna arrays of each frequency band of the shared RF link of each wireless signal direction finding device is a preset first angle; the horizontal beamwidth of the constructed low-frequency antenna array is set to a preset second angle; the horizontal beamwidth of the intermediate-frequency antenna array is set to a preset third angle; the horizontal beamwidth of the high-frequency antenna array is set to a preset fourth angle; the initial position of the antenna array of each frequency band is set to the coordinate position corresponding to the preset fifth angle; the antenna arrays of each frequency band of the shared RF link of each wireless signal direction finding device are arranged according to a preset layout strategy; the antenna arrays of each frequency band of each wireless signal direction finding device are deployed according to the layout strategy of the antenna arrays of each frequency band of the shared RF link of each wireless signal direction finding device; according to the number of wireless signal direction finding devices required in the target area, each wireless signal direction finding device is deployed in the target area in sequence and the coordinate information of each wireless signal direction finding device in the target area is recorded to comprehensively collect all wireless signals in the target area.

[0008] Preferably, each wireless signal direction finding device includes a signal control system, and each signal control system includes a main control unit, a switching array, and a digital intermediate frequency board. The system collects wireless signals across the entire frequency band of the target area through the antenna array of the shared radio frequency link of each wireless signal direction finding device. This includes: using the main control unit of the signal control system of each wireless signal direction finding device to control the switching array, sequentially connecting the antenna arrays of each frequency band of the shared radio frequency link of each wireless signal direction finding device according to the wireless signal direction finding requirements of the target area; the main control unit, based on the frequency of the target frequency band antenna array currently connected to the switching array, controls the digital intermediate frequency board to adjust the local oscillator of the frequency conversion module of the target frequency band to the intermediate frequency point or zero frequency point, wherein the digital intermediate frequency board includes a dual-channel AD chip; and based on the intermediate frequency point or zero frequency point of the antenna array of the target frequency band, the dual-channel AD chip collects the target wireless signal of the target area, which includes the main operating signal and various interference signals of the target area.

[0009] Preferably, analyzing the full-band wireless signals of the target area collected by all wireless signal direction finding devices to determine the relevant information of the target interference signal in the target area includes: analyzing the full-band wireless signals collected by each wireless signal direction finding device in each target area to obtain the wireless signal analysis results of each wireless signal direction finding device; comprehensively analyzing the wireless signal analysis results of all wireless signal direction finding devices in the target area to determine the relevant information of the target interference signal in the target area; wherein, the digital intermediate frequency board of each wireless signal direction finding device further includes a first digital filter, a second digital filter, a wireless direction finding module, a wireless decoding module, a first power statistics module, and a second power statistics module; then analyzing the full-band wireless signals collected by each wireless signal direction finding device in each target area to obtain the wireless signal analysis results of each wireless signal direction finding device includes: filtering the wireless signals of the target area collected by each wireless signal direction finding device through the first digital filter and the second digital filter to obtain first wireless signal data and second wireless signal data, wherein the bandwidth of the second digital filter of each wireless signal direction finding device is set to the target area being detected The bandwidth of the measured spectrum, specifically the bandwidth of the spectrum detected in the target area, is set according to the wireless signal detection requirements of the target area. The first wireless signal data corresponding to each wireless signal direction finding device is output to the first power statistics module for analysis to obtain third wireless signal data, which includes the power of the main operating signal in the target area. The second wireless signal data is output to the second power statistics module for analysis to obtain fourth wireless signal data, which includes the sum of the powers of all wireless signals in the target area. Based on the sum of the powers of all wireless signals in the target area and the power of the main operating signal, the target power value with the highest power value among all wireless interference signals in the target area is determined. The third and fourth wireless signal data are output to the wireless decoding module for decoding processing to obtain the first characteristic data of the wireless signal in the target area. The third and fourth wireless signal data are output to the wireless direction finding module for direction finding analysis to obtain the second characteristic data of the wireless signal in the target area. Based on the first characteristic data, the fourth characteristic data, and the target power value, the relevant information of the target wireless interference signal with the strongest interference in the target area is determined.

[0010] Preferably, the bandwidth of the spectrum detected in the target area is set to three times the bandwidth corresponding to the main operating signal in the target area; the calculation formula for the main operating signal power of the target area obtained by the first power statistics module of each wireless signal direction finding device analyzing the first wireless signal data includes: ,in, Indicates the power of the main operating signal in the target area; This represents the data in channel I after passing through the first digital filter; This represents the data from the Q-channel after passing through the first digital filter; N represents the number of sampled data points, where the range of the number of sampled data points is set to [10K, 100K]; the second power statistics module analyzes the second wireless signal data to obtain the following formula for calculating the sum of the power of all wireless signals in the target area: ,in, This represents the sum of the power of all wireless signals in the target area; This represents the data in channel I after passing through the second digital filter; This represents the data in the Q channel after passing through the second word filter; the formula for calculating the target power value with the largest power value among all wireless interference signals in the target area, based on the power of all wireless signals in the target area and the power of the main operating signal, includes the following: ,in, This represents the target power value with the highest power value among all wireless interference signals in the target area.

[0011] Preferably, based on the first feature data, the fourth feature data, and the target power value, relevant information of the target wireless interference signal with the strongest interference in the target area is determined; it is determined whether the target power value exceeds a preset sixth threshold; if the target power value exceeds the preset sixth threshold, the wireless signal corresponding to the target power value is determined as the target interference signal that needs to be monitored in a directional manner, and relevant information of the target wireless interference signal with the strongest interference in the target area is determined based on the first feature data, the fourth feature data, and the target power value.

[0012] Preferably, the method further includes: after each wireless signal direction finding device determines the main operating signal power and the sum of the power of all wireless signals in the target area, each wireless signal direction finding device performs power retrieval analysis on all wireless signals in the target area except for the main operating signal in sequence from low frequency band to high frequency band, based on a preset seventh threshold as the step unit, and determines the frequency point of the wireless signal with the maximum operating frequency in the detected spectrum range of the target area and its corresponding bandwidth as the interference frequency point and interference signal bandwidth of the wireless interference signal in the target area.

[0013] Preferably, the digital intermediate frequency board of each wireless signal direction finding device further includes an interference signal judgment module. The method further includes: analyzing the bandwidth and frequency information of the target interference signal through the interference signal judgment module of each wireless signal direction finding device; determining the antenna array of the target frequency band where the maximum power of the target interference signal is obtained in each wireless signal direction finding device based on the frequency information of the target interference signal; determining the direction corresponding to the antenna array of the target frequency band as the azimuth of the target interference signal based on the coordinate information of each wireless signal direction finding device in the target area; cross-verifying the direction of the target interference signal determined by each wireless signal direction finding device; and determining the azimuth of the target interference signal as the intersection area of ​​the directions of the target interference signals determined by all wireless signal direction finding devices. During the process of direction finding the target interference signal through a network of multiple wireless signal direction finding devices, it is necessary to set the initial position antenna arrays of the low-frequency, intermediate-frequency, and high-frequency antenna arrays of each wireless signal direction finding device, and to set the antenna arrays of each frequency band... In this process, all antenna arrays except the initial position antenna array are offset in direction relative to the initial position. The process for each wireless signal direction finding device to determine the azimuth of the target wireless interference signal is as follows: the baseband filter of the target frequency band is set to the bandwidth of the target interference signal; the main control unit polls each antenna array in the corresponding target frequency band to obtain the power of the interference wireless signal received by each antenna array in the target frequency band; comparing the power of the interference wireless signal received by each antenna array in the target frequency band, the azimuth of the wireless signal with the highest power value is determined as the azimuth of the target interference signal; sequentially, for all wireless signals requiring directional monitoring in the target area, excluding the target interference signal and the main operating signal whose azimuth map has been determined, the operation of analyzing the relevant information of the target interference signal through the interference signal judgment module to determine the bandwidth and frequency of the target interference signal is repeated until the azimuth of all wireless interference signals requiring directional monitoring in the target area is determined sequentially.

[0014] A wireless signal direction finding device includes: one or more processors and a memory; the memory stores computer-readable instructions, which, when executed by one or more processors, implement the steps of any of the wireless signal direction finding methods described above.

[0015] A readable storage medium storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of any of the wireless signal direction finding methods described above.

[0016] As can be seen from the above introduction, this application utilizes an antenna array with a shared radio frequency link, effectively avoiding the high costs associated with configuring separate radio frequency and digital circuits for each channel by sharing the radio frequency front-end and digital signal processing link. Although a large number of antenna elements are used, the unit cost of the antennas can be significantly reduced after molding, thereby achieving a great optimization of the overall hardware cost while ensuring performance. This solution can simultaneously support wireless signal sensing and direction finding across the low, medium, and high frequency bands, overcoming the limitation of traditional direction finding systems that are usually limited to specific frequency bands. This feature significantly improves the system's applicability and environmental adaptability, meeting the monitoring and positioning needs in multiple frequency bands and scenarios. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort. Figure 1 The flowchart of the wireless signal direction finding method provided in this application; Figure 2 This is a schematic diagram of the wireless signal direction finding system architecture as an example of this application; Figure 3 A schematic diagram of the antenna array layout of the shared radio frequency link of the wireless signal direction finding device as an example of this application; Figure 4 This is a schematic diagram illustrating the effect of two wireless signal direction-finding devices jointly determining interference signal A, as exemplified in this application. Figure 5 This is a schematic diagram of signal analysis after combining two filters in a wireless signal direction finding device. Figure 6 This is a hardware structure block diagram of the wireless signal direction finding device disclosed in this application. Detailed Implementation

[0018] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] This wireless signal direction finding method utilizes an antenna array with a shared radio frequency link. By sharing the radio frequency front-end and digital signal processing link, it effectively avoids the high costs associated with configuring separate radio frequency and digital circuits for each channel, while ensuring omnidirectional and full-band wireless signal monitoring. This solution can simultaneously support wireless signal sensing and direction finding across low, medium, and high frequency bands, overcoming the limitations of traditional direction finding systems that are typically limited to specific frequency bands. This feature significantly improves the system's applicability and environmental adaptability, meeting the monitoring and positioning needs in multiple frequency bands and scenarios.

[0020] The following is combined with Figure 1 This paper describes the flow of the wireless signal direction finding method provided in this application, such as... Figure 1 As shown, the process may include the following steps: Step S101: Based on the wireless signal information to be monitored in the target area, deploy at least two wireless signal direction finding devices in the target area and construct an antenna array for each wireless signal direction finding device with a shared radio frequency link.

[0021] Specifically, in actual monitoring, it may be necessary to monitor multiple signals of different frequency bands simultaneously at the same location. Setting up a separate antenna system for each task would result in bulky equipment and high costs. When performing wireless signal interference direction finding in a target area, at least two wireless signal direction finding devices can be deployed in the target area based on the wireless signal information to be monitored. An antenna array sharing a radio frequency link for each wireless signal direction finding device can be constructed to achieve high-precision time difference of arrival (TDOA) positioning. A single direction finding device can typically only roughly determine the signal direction using amplitude comparison or interferometry, but cannot accurately determine the signal distance. By deploying two or more spatially separated direction finding devices, TDOA technology can be used for positioning. TDOA positioning requires extremely high time synchronization. By sharing a radio frequency link, independent clock drift between different devices can be eliminated, ensuring the comparability of signal arrival times measured by each station, thereby achieving accurate intersection positioning. Single-station direction finding often faces the problem of front / back / left / right mirror ambiguity. For example, a simple array may not be able to distinguish whether a signal comes from in front of or behind the antenna. When two devices in different locations simultaneously measure the direction line, the unique intersection of these two direction lines is the true location of the signal source, thus eliminating the ambiguity of single-station direction finding. If the antenna elements within each direction-finding device do not share a radio frequency link, effective phase interference cannot be formed. By constructing an array with a shared radio frequency link, the array aperture can be expanded, angular resolution improved, and the direction line provided by each single station narrower and more accurate. Interference signals are often accompanied by multipath effects and fading. Sharing the local oscillator and clock ensures phase consistency across multiple antenna channels, thus enabling beamforming techniques. The array can use digital signal processing to form a receiving beam in the direction of the interference source, while simultaneously creating nulls in other directions with strong interference, suppressing environmental noise and intentional interference, and improving the signal-to-noise ratio. Direction-finding accuracy is related to the antenna spacing. Generally, the longer the baseline, the higher the angular resolution. Wireless signals in the target area may contain frequency-hopping signals, burst signals, or broadband signals. Antenna arrays with shared radio frequency links ensure amplitude and phase consistency across all channels throughout the entire frequency band, which is crucial for processing broadband signals. Multiple direction finding stations increase the probability of capturing sudden signals, ensuring that at least two stations can simultaneously intercept the same sudden signal for cross-location.

[0022] Step S102: Collect wireless signals across the entire frequency band of the target area through the antenna array of the shared radio frequency link of each wireless signal direction finding device.

[0023] Specifically, in practice, interference signals are "full-band and sudden." After constructing an antenna array with a shared radio frequency link based on environmental parameters, to resolve the core contradiction in wireless monitoring, the antenna array with the shared radio frequency link can be used to collect wireless signals of different frequency bands in the target area. This allows for the construction of a wide-bandwidth, high-precision, and holographic electromagnetic environment sensing system. This is not only to find signals at known frequencies, but also to discover unknown threats and analyze signal mechanisms in complex electromagnetic environments through full-domain data, and to provide qualified coherent data for high-precision direction-finding algorithms.

[0024] Step S103: Analyze the full-band wireless signals of the target area collected by all wireless signal direction finding devices to determine the relevant information of the target interference signals in the target area.

[0025] Specifically, the raw data collected is chaotic and unfiltered. It collects full-band signals, meaning the equipment receives all electromagnetic energy within the target area: legitimate broadcast signals, base station signals, WiFi signals, industrial radiation, and genuine interference signals. To determine the wireless interference signals affecting the target area, all wireless signals collected by the wireless signal direction finding equipment across the entire frequency band can be analyzed to identify relevant information about the target interference signals. Through analysis, normal communication signals are removed or marked from the data, preventing the direction finding equipment from tracking a legitimate television signal while ignoring the truly illegal interference sources. Interference signals typically have unique fingerprints that distinguish them from normal communication signals. For example, normal 4G / 5G signals have a specific frame structure, while interference signals may be irregular noise floor increases, single-carrier blocking signals, or periodic pulses. Analysis can extract these anomalous features from the complex spectrum environment. Antenna array direction finding relies on the phase difference of the signal. However, the calculation of the phase difference must be based on the specific frequency and modulation characteristics of the signal. The center frequency and bandwidth of the interference signal need to be analyzed. For example, if the interference is broadband noise, it may be necessary to select a clean carrier segment within the noise band as the direction-finding reference; if the interference is a frequency-hopping signal, its frequency-hopping pattern needs to be analyzed to perform tracking and direction finding at each frequency-hopping point. When multiple signals coexist, if the waveform characteristics of the target interference signal are not analyzed and extracted, the direction-finding equipment may be unable to distinguish between two signals of the same frequency, causing the direction-finding result to point to the power centroid of the two signals, rather than the actual location of the interference source. Is the interference signal horizontally polarized, vertically polarized, or circularly polarized? If the antenna array polarization of the direction-finding equipment does not match the interference signal, it will result in extremely weak signal reception and a large direction-finding error. Analyzing the acquired IQ data can infer the polarization characteristics of the signal. Different modulation methods (such as CW, AM, FM, and digital modulation) have different requirements for the intermediate frequency bandwidth setting of the direction-finding receiver. An excessively wide bandwidth setting will introduce out-of-band noise, reducing the direction-finding signal-to-noise ratio; an excessively narrow bandwidth setting will cut off the effective energy of the signal, leading to phase distortion. Determining the accurate bandwidth through analysis is a prerequisite for ensuring direction-finding accuracy. By performing time-domain and frequency-domain analysis on the full-band signal, a preliminary assessment can be made to determine whether severe multipath interference exists. This can be achieved by analyzing the signal's delay spread or correlation peaks. If severe multipath interference is present, directly performing direction finding on the original signal may yield the direction of a reflection source, rather than the actual interference source. The analysis process helps operators select algorithms with stronger multipath resistance or identify direct and reflected waves. In particular, since at least two direction-finding devices are deployed in the target area, it is crucial to ensure that both devices are measuring the same wireless signal during direction finding. If device A analyzes and determines the interference to be a 1MHz pulse, while device B analyzes and determines it to be a 1.1MHz continuous wave, then the intersection of the two devices' analyses will be incorrect.By analyzing the data, the unique characteristics of the interference signal (such as precise frequency, modulation characteristics, and time window of occurrence) can be extracted. These characteristics can then be used as mission parameters and uniformly distributed to all direction finding stations to ensure that everyone is tracking the same physical target.

[0026] Therefore, this application can provide, as Figure 2 A wireless signal direction finding system is shown, applicable to the described method. The system includes: an antenna array module sharing a radio frequency link, a switching array module, and a signal control system. The signal control system can be connected to the antenna array module sharing the radio frequency link via the switching array module. The antenna array module sharing the radio frequency link may include several low-frequency antennas, several intermediate-frequency antennas, and several high-frequency antennas. The antennas of different frequency bands in the antenna array module sharing the radio frequency link are responsible for sequentially receiving wireless signals of different frequency bands from the target area and transmitting them to the signal control system. The signal control system receives the wireless signals of different frequency bands sequentially received by the antenna array of the shared radio frequency link and analyzes the received wireless signals of different frequency bands based on the operational signal parameters of the target area to determine relevant information about wireless interference signals existing in the target area.

[0027] As described above, this application can deploy at least two wireless signal direction finding devices in a target area based on the wireless signal information to be monitored in the target area, and construct an antenna array with a shared radio frequency link for each wireless signal direction finding device. The process is described below, and includes: Step S201: Based on the wireless signal information to be monitored in the target area, determine the number of wireless signal direction finding devices that need to be deployed in the target area.

[0028] Specifically, in the task of direction finding in the face of wireless signal interference, the information of the wireless signal to be monitored (such as frequency, bandwidth, modulation method, signal strength, frequency hopping, etc.) directly determines the technical requirements and deployment strategy of the direction finding system. To improve the accuracy of wireless signal direction finding in the target area and save costs, the number of wireless signal direction finding devices to be deployed in the target area can be determined based on the wireless signal information to be monitored. The positioning accuracy of the direction finding devices largely depends on the baseline length between the stations. For low-frequency signals such as long waves and medium waves, the wavelength is relatively long, and the phase change is slow. If two direction finding devices are too close, the phase difference of the signals received at different locations is extremely small, resulting in a large direction finding error. This requires the stations to be spaced very far apart. However, if the stations are too far apart, the signal may not be received (insufficient signal-to-noise ratio). For high-frequency and ultra-high-frequency signals, the wavelength is very short. If the stations are too far apart, the phase difference will be blurred, resulting in integer ambiguity. Depending on the signal's frequency characteristics, it may be necessary to deploy more than three stations (e.g., in a triangular or diamond pattern). Ambiguity is resolved through redundant baselines between multiple stations, ensuring both sufficient baseline length for improved accuracy and adequate proximity for stations to receive strong signals. Is the signal to be monitored a narrowband continuous wave or a wideband frequency-hopping signal? This determines the operating mode of the direction-finding system. For narrowband continuous signals, two direction-finding devices (dual-station cross-positioning) can typically provide an approximate location. For wideband / frequency-hopping signals, if the signal is frequency-hopping, a single station may only capture fragmented pulses, making continuous tracking impossible. Deploying multiple stations (3-4) that share clock and data links enables distributed coherent reception. This means multiple stations simultaneously capture different copies of the same frequency-hopping pulse, and through comprehensive processing, reconstruct the complete signal path, achieving high-precision positioning. Signals attenuate during propagation and are blocked by buildings. If the signal to be monitored is very weak, or the target area has a complex electromagnetic environment, any single station may fail to receive the signal due to obstruction. The effective monitoring radius of a single station needs to be calculated based on the estimated signal strength (inferred from signal information). This radius is then used to cover the target area, and geometric calculations determine the minimum number of stations required to achieve seamless coverage. Typically, at least three stations are needed to ensure that any point in the target area can be simultaneously seen by at least two (ideally three) stations, thus enabling effective cross-location.

[0029] Step S202: Based on the parameters of all operating wireless signals in the target area, set the parameters of each wireless signal direction finding device in the target area.

[0030] Specifically, the target area is filled with various operational signals, which can be very strong. The antennas and receivers of wireless signal direction finding devices have frequency ranges. To improve the identification of wireless signals in the target area, before deploying each wireless signal direction finding device, the parameters of each device in the target area can be set according to the parameters of all operational wireless signals in the target area. For example, there may be a high-power broadcast signal (e.g., 100MHz, 100kW) among the operational signals in the target area. If the wireless signal direction finding device is monitoring weak interference at 101MHz, but without enabling targeted bandpass filtering, the strong 100kW signal will directly flood the amplifier at the receiver front end, causing blocking interference or even burning out the low-noise amplifier. However, by setting a notch filter according to the parameters of the operational signals, these known operational signals can be filtered out, protecting the equipment and exposing the target signal. Secondly, different wireless signals occupy different bandwidths. The intermediate frequency bandwidth of the wireless signal direction finding device must match the bandwidth of the target signal. If the target signal is 20MHz wideband interference, but the device's intermediate frequency bandwidth is only set to 25kHz, only a very small portion of the signal energy will be detected, with a large amount of signal energy blocked, resulting in a very poor signal-to-noise ratio and making direction finding impossible. If the target signal is 25kHz narrowband interference, but the device is set to 5MHz bandwidth, a large amount of out-of-band noise and adjacent channel operating signals will flood in, causing unstable direction finding phase and decreased accuracy. Based on the signal's modulation parameters (AM / FM / PM / IQ), a suitable demodulator should be set to ensure that the demodulated audio or data can be used for monitoring confirmation or subsequent processing. Based on the parameters of all operating wireless signals in the target area, the parameters of each wireless signal direction finding device in the target area should be dynamically adjusted with gain control to prevent auditory distortion and ensure that the scanning strategy and timing are synchronized to ensure successful detection.

[0031] Step S203: Based on the parameters of all operating wireless signals in the target area and the parameters of each wireless signal direction finding device.

[0032] Specifically, to ensure that the deployed wireless direction-finding equipment can accurately collect all wireless signals in the target area, the parameters of all operational wireless signals in the target area and the parameters of each wireless direction-finding device can be used. If the equipment is deployed directly to the site, it may result in a situation where the wireless direction-finding equipment is powered on but cannot effectively capture interference signals. For example, if there is a strong broadcast signal (operational signal) in the target area, and the goal is to capture a weak frequency-hopping interference signal, theoretical calculations will show that if the level of the target interference signal reaching the direction-finding equipment is much lower than the residual level of the filtered operational signal in that frequency band, then the interference signal is submerged in the normal signal.

[0033] Step S204: Based on the wireless signal information to be monitored in the target area, construct a low-frequency antenna array, a medium-frequency antenna array, and a high-frequency antenna array for the shared radio frequency link of each wireless signal direction finding device.

[0034] Specifically, in reality, there is no single antenna that can maintain high efficiency, consistency, and high gain across the entire 10kHz to 40GHz range. To cover the various frequencies of signals that may be monitored in the target area, frequency band design is necessary based on the signal information. Based on the wireless signal information to be monitored in the target area, low-frequency, intermediate-frequency, and high-frequency antenna arrays can be constructed for each wireless signal direction-finding device, forming a shared RF link. The physical size of the antenna is proportional to its operating wavelength. Efficient radiation typically requires the antenna length to be between one-quarter and one-half of the wavelength. Low-frequency signals can have wavelengths of tens or even hundreds of meters. Efficient reception requires a large antenna. High-frequency signals have wavelengths of only a few centimeters to millimeters. Antennas can be made very small. If a large low-frequency antenna is used to receive high-frequency signals, the antenna pattern will split into countless lobes due to its excessive electrical size, leading to multi-valued ambiguity in direction finding. If a small high-frequency antenna is used to receive low-frequency signals, the radiation efficiency will be extremely low due to its small electrical size, resulting in almost no signal reception. The frequency range of the signal to be monitored directly determines the physical size of the antenna array required. For example, monitoring FM broadcast interference (~100MHz) requires an intermediate frequency (IF) antenna; monitoring 5G interference (~3.5GHz) requires a high-frequency (HF) antenna. The accuracy of array direction finding (especially phase comparison) is related to the ratio of antenna aperture to wavelength. Generally, a larger aperture results in higher angular resolution. By dividing the array into frequency bands, dedicated, narrowband RF devices can be selected for each band. These devices have excellent flatness and consistency within their specific frequency band, ensuring inter-channel amplitude and phase consistency of the shared RF link. The bandwidth information of the signal to be monitored determines the instantaneous bandwidth required for each band array, thus guiding the selection of matching RF front-end devices. Wireless signals have different polarization methods (vertical polarization, horizontal polarization, circular polarization). Low-frequency bands typically use vertically polarized whip antennas or loop antennas. High-frequency bands (such as satellite communications) may use circularly polarized helical antennas. If a fixed-polarization antenna is used to receive all signals, signal attenuation of more than 20dB may occur due to polarization mismatch. By analyzing the polarization information of the signal to be monitored, an antenna array with a specific polarization in that frequency band can be constructed to ensure efficient energy reception.In this system, the number of antennas in each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device is set according to the size of the antenna array in each frequency band; the number of low-frequency antenna arrays is a preset first threshold, the number of intermediate-frequency antenna arrays is a preset second threshold, and the number of high-frequency antenna arrays is a preset third threshold; the coverage area formed by the antenna arrays of each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device is a preset first angle; the horizontal beamwidth of the constructed low-frequency antenna array is set to a preset second angle; the horizontal beamwidth of the intermediate-frequency antenna array is set to a preset third angle; the horizontal beamwidth of the high-frequency antenna array is set to a preset fourth angle; the initial position of the antenna array of each frequency band is set to the coordinate position corresponding to a preset fifth angle; and the antenna arrays of each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device are arranged using a preset layout strategy.

[0035] For example, in the design, the number of antennas in each frequency band of the antenna array sharing the RF link can be set according to the antenna size of each frequency band; the number of low-frequency antenna arrays can be set to a preset first threshold, the number of intermediate-frequency antenna arrays can be set to a preset second threshold, the number of high-frequency antenna arrays can be set to a preset third threshold, the element width of the low-frequency antenna array can be set to a preset fourth threshold, the element width of the intermediate-frequency antenna array is a preset fifth threshold, and the element width of the high-frequency antenna array is in the range of [0, 8cm]. The antenna array of the shared RF link consists of dual-polarized antennas in each frequency band. The spacing between the antenna elements in each frequency band is set to be greater than half the wavelength of the lowest frequency band in that band. Each antenna array outputs two RF terminals. The coverage area formed by the antenna arrays of each frequency band is a preset first angle. The horizontal beamwidth of the constructed low-frequency antenna array is set to a preset second angle; the horizontal beamwidth of the intermediate-frequency antenna array is set to a preset third angle; and the horizontal beamwidth of the high-frequency antenna array is set to a preset fourth angle. The initial position of each frequency band antenna array is set to the coordinate position corresponding to a preset fifth angle. The antennas of each frequency band in the shared RF link antenna array are arranged using a preset layout strategy. The preset first threshold can be set to 6; the preset second threshold can be set to 8; the preset third threshold can be set to 12; the preset fourth threshold can be set to 15cm; and the preset fifth threshold can be set to 10cm. The preset second, third, and fourth angles can be calculated based on the number of low-frequency, intermediate-frequency, and high-frequency antenna arrays, respectively. For example, the preset first angle can be set to 360°; the preset second angle can be set to 60°; the preset third angle can be set to 45°; the preset fourth angle can be set to 30°; and the preset fifth angle can be set to the actual coordinates corresponding to the 0-degree horizontal position. For example, the frequency band of the low-frequency antenna can be 900MHz-1800MHz, the frequency band of the intermediate-frequency antenna can be 1800MHz-2700MHz, and the frequency band of the high-frequency antenna can be 2700MHz-3500MHz. Figure 3As shown, the antenna array for a shared RF link constructed in a certain area can have 6 low-frequency antennas (numbered 0-5), with limited size. The number of intermediate-frequency (IF) antennas can also be 6 (numbered 0-5, but in practice, 8 (numbered 0-7) depending on the application scenario), and the number of high-frequency antennas can be 12 (numbered 0-11). The width of the low-frequency antenna array can be designed to be approximately 15cm, the IF antenna array approximately 10cm, and the high-frequency antenna array approximately 8cm. To control the overall device size, considering the antenna size, it should be housed in a single enclosure. Increasing the number of high-frequency arrays also improves sensing accuracy. Therefore, when constructing the antenna array for the shared RF link, multiple arrays need to be combined. The antenna arrays for the three frequency bands are all dual-polarized antennas. The spacing between the antenna arrays in each frequency band is greater than half the wavelength of the lowest frequency band in that band. Each antenna outputs two RF terminals. Each antenna is a dual-polarized antenna; only when two antennas exceed half the wavelength can the MIMO characteristics be demonstrated. Multiple antennas of different frequency bands can form a 360° coverage area; based on this, the horizontal beamwidth of the low-frequency antenna can be set to 360 / 6=60°; the horizontal beamwidth of the intermediate-frequency antenna can be set to 360 / 8=45°; and the horizontal beamwidth of the high-frequency antenna can be set to 360 / 12=30°. In practice, the beamwidth of the antennas of each frequency band can be designed to be different by the number of elements and the backplane design. Multiple antennas of different frequency bands can be planted using low, medium, and high frequency transparency technology to reduce the overall size of the device. Because low-frequency antennas have a long wavelength, they can be designed for transparency, allowing them to radiate to low frequencies bypassing high-frequency antennas. Therefore, high-frequency antennas can be deployed at the end, medium-frequency antennas in the middle of low-frequency antennas, and low-frequency antennas at the front. Each antenna has two ports interconnected with the antenna switching array. In practice, the A and B ports of the switching array serve as the interface with the RF board. The RF board ensures the radiation angle and gain of each antenna. The RF board plus the antenna array forms a standard unit for a plate antenna. The switching array is a multi-level array composed of multiple switches, controlled by the main control unit to achieve switching and polling of each antenna. To perform direction finding of the wireless signal in the target area, a relative 0° reference position must first be set. Therefore, the low-frequency, medium-frequency, and high-frequency antennas are all set to the 0° position.After setting the 0 position, the baseband board can determine which frequency band antenna is currently connected when switching antennas. Then, based on the base station number, the current orientation is determined, completing the initial direction finding based on the sector number. A second iteration using an algorithm then performs higher-precision direction finding, superimposing angles clockwise. Antennas are categorized as follows: low-frequency antennas (numbered 0-5), intermediate-frequency antennas (numbered 0-5), and high-frequency antennas (numbered 0-11). This establishes a correspondence for RF connectors 1-52. The 0-degree position refers to the actual coordinates of the 0-degree horizontal position, equivalent to a manually determined initial direction finding position from a bird's-eye view of the entire airport.

[0036] Step S205: Deploy the antenna arrays of each frequency band of each wireless signal direction finding device according to the antenna array layout strategy of each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device.

[0037] Specifically, after constructing antenna arrays for each frequency band of the shared radio frequency link antenna array for each wireless signal direction finding device, it is demonstrated that each wireless signal direction finding device possesses the function of data acquisition. Therefore, the antenna arrays for each frequency band of each wireless signal direction finding device can be deployed according to the arrangement strategy of the antenna arrays for each frequency band of the shared radio frequency link antenna array. This allows for the acquisition of wireless signals in the target area through each wireless signal direction finding device.

[0038] Step S206: Based on the number of wireless signal direction finding devices required in the target area, deploy each wireless signal direction finding device in the target area in sequence and record the coordinate information of each wireless signal direction finding device in the target area to comprehensively collect all wireless signals in the target area.

[0039] Specifically, as mentioned above, the number of wireless direction-finding devices required for the target area has been determined based on the direction-finding requirements of the target area. Therefore, based on the required number of wireless signal direction-finding devices, each device can be deployed sequentially in the target area, and the coordinate information of each device can be recorded to comprehensively collect all wireless signals in the target area. Recording the coordinate information of each device facilitates subsequent direction-finding analysis of the wireless signals in the target area, allowing for the determination of the location information of any wireless interference signals present in the target area.

[0040] In practice, each wireless signal direction finding device includes a signal control system. As mentioned above, each signal control system includes a main control unit, a switching array, and a digital intermediate frequency board. The process of acquiring wireless signals across the entire frequency band of the target area through the shared radio frequency link antenna array of each wireless signal direction finding device can be as follows: First, the main control unit of the signal control system of each wireless signal direction finding device controls the switching array. Then, according to the wireless signal direction finding requirements of the target area, the antenna arrays of each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device are connected sequentially. Next, the main control unit controls the digital intermediate frequency board to adjust the local oscillator of the target frequency band radio frequency module to the intermediate frequency point or zero frequency point based on the frequency of the target frequency band antenna array currently connected to the switching array. The digital intermediate frequency board includes a dual-channel AD chip. Finally, based on the intermediate frequency point or zero frequency point of the target frequency band antenna array, the target wireless signal of the target area is acquired through the dual-channel AD chip. The target wireless signal includes the main operating signal and various interference signals of the target area.

[0041] Specifically, as mentioned above, low-frequency and high-frequency antennas are independent physical entities. If all antennas are directly connected in parallel without a switching array, high-frequency signals will interfere with the low-frequency antennas, and low-frequency signals will be loaded onto the high-frequency antennas, leading to severe impedance mismatch and mutual coupling effects, rendering the entire system malfunctioning. By controlling the switching array through the main control unit, it is ensured that only the antenna array targeting the target frequency band is connected to the back-end RF module at any given time. This prevents strong signals from other frequency bands from flooding the currently operating receiver, causing congestion or damage. Secondly, although the dual-channel AD chip has a high sampling rate, it cannot directly sample all signals from 10kHz to 40GHz. It has an optimal input frequency range (usually in the intermediate frequency or baseband). The role of the RF module is to shift the high-frequency target wireless signal to a lower frequency that the AD chip can handle. If the digital intermediate frequency board (IF board) requires an IF frequency (e.g., 70MHz or 140MHz), the main control unit must calculate the required local oscillator setting (e.g., 3.43GHz) based on the target frequency band antenna array (e.g., 3.5GHz 5G band) to convert the 3.5GHz signal into a 70MHz IF signal. If the desired frequency is zero (baseband I / Q signal), the local oscillator must be precisely set to the carrier frequency of the antenna receiving the signal (e.g., 3.5GHz), directly down-converting it to a 0Hz baseband signal. Whether the target area needs to monitor the main operating signal or interference signals determines how much bandwidth needs to be retained and whether image suppression is required. Zero-IF architecture is suitable for wideband signals, while superheterodyne IF architecture is suitable for narrowband high-sensitivity signals. The main control unit must determine which frequency conversion strategy to use based on the wireless signal direction finding requirements. The most crucial data for wireless signal direction finding is the phase difference between the signals received by the two antenna elements. A dual-channel AD chip ensures strictly synchronized sampling of two signals from a shared RF link. These two channels share a single clock source, ensuring perfectly synchronized sampling times. Using two independent AD chips would cause even a picosecond-level clock deviation to drastically reduce direction-finding accuracy. By adjusting the local oscillator to a specified frequency, the dual-channel AD chip can utilize its high-speed sampling rate to capture a tens-of-MHz-wide instantaneous bandwidth in a single pass. This allows for the acquisition of not only narrowband main operating signals but also a complete capture of broadband interference signals. Simply acquiring interference signals is insufficient for localization. Ideally, the main operating signal should be stable and known. When interference signals occur, they are superimposed on the main operating signal. The raw IQ data acquired by the dual-channel AD chip contains all the electromagnetic energy within that frequency band.To determine the relevant information of target interference signals in the target area, the full-band wireless signals collected by each wireless signal direction finding device in each target area can be analyzed to obtain the wireless signal analysis results of each device. By comprehensively analyzing the wireless signal analysis results of all wireless signal direction finding devices in the target area, the relevant information of target interference signals in the target area can be determined. For example... Figure 4 As shown, the first antenna of the first high-frequency antenna array for wireless signal direction finding calculates the directional coordinate of the interference signal A as the first coordinate; the eleventh antenna of the second high-frequency antenna array for wireless signal direction finding calculates the directional coordinate of the interference signal A as the second coordinate; by cross-checking the first and second coordinates, the true coordinates of the interference signal A can be determined. Each wireless signal direction finding device's digital intermediate frequency board further includes a first digital filter, a second digital filter, a wireless direction finding module, a wireless decoding module, a first power statistics module, and a second power statistics module. The process of analyzing the full-band wireless signals collected by each wireless signal direction finding device in each target area to obtain the wireless signal analysis results for each device can include the following: First, the wireless signals collected by each wireless signal direction finding device in the target area are filtered by the first and second digital filters to obtain first and second wireless signal data. The bandwidth of the second digital filter for each wireless signal direction finding device is set to the bandwidth of the detected spectrum in the target area, and the bandwidth of the detected spectrum in the target area is set according to the wireless signal detection requirements of the target area. Then, the first wireless signal data corresponding to each wireless signal direction finding device is output to the first power statistics module for analysis. The system obtains third wireless signal data, which includes the power of the main operating signal in the target area. The second wireless signal data is then output to the second power statistics module for analysis to obtain fourth wireless signal data, which includes the sum of the powers of all wireless signals in the target area. Based on the sum of the powers of all wireless signals in the target area and the power of the main operating signal, the target power value with the highest power among all wireless interference signals in the target area is determined. The third and fourth wireless signal data are then output to the wireless decoding module for decoding processing to obtain the first characteristic data of the wireless signals in the target area. The third and fourth wireless signal data are then output to the wireless direction-finding module for direction-finding analysis to obtain the second characteristic data of the wireless signals in the target area. Finally, based on the first and fourth characteristic data and the target power value, relevant information about the strongest interfering target wireless signal in the target area is determined.

[0042] Specifically, the first digital filter can be a narrowband filter, which extracts the clean main operational signal. Main operational signals (such as base stations and broadcasts) typically occupy a specific bandwidth and conform to standards. Narrowband filtering removes out-of-band noise and adjacent-channel interference, resulting in a relatively clean signal for accurate power measurement and decoding. The second digital filter can be a wideband filter, with its bandwidth set to the bandwidth of the detected spectrum, covering the entire monitoring frequency band. This captures all electromagnetic energy within the band, including main operational signals, spurious emissions, wideband noise interference, and impulse interference. This is for statistical analysis of the overall occupancy of the frequency band. By setting two filters with different bandwidths, a multi-view observation of the same signal source is achieved. The first power statistics module calculates the power of the main operational signal after narrowband filtering. This represents the legitimate, known electromagnetic environment background. The second power statistics module calculates the sum of the power of all wireless signals after wideband filtering. This sum includes the main operational signal + noise floor + various interference signals. By comparing the total power across the entire frequency band with the known power of the main operational signal, the overall strength of the interference signals can be deduced. In interference troubleshooting, the principle of tackling strong interference first and then weak interference is generally followed. The most powerful interference signal is often the most serious and easiest to locate threat to normal communication. By calculating the power of all wireless signals and the difference between the power of the main operating signal and the power of the main operating signal, the interference intensity of the current frequency band can be initially determined. Although the specific characteristics of the interference are not yet known, the strength of the interference is known, which sets the priority for subsequent processing. The main operating signal after narrowband filtering and the full-band signal after wideband filtering are demodulated and decoded. If the signal is of a known standard (such as LTE, GSM), the wireless decoding module can read the base station ID, broadcast content, etc. If it is an interference signal, the wireless decoding module may find that it is undemodulated noise, a continuous carrier, or a sudden pulse, thereby extracting the modulation characteristics of the interference. Using the phase difference data collected by the dual-channel AD chip, combined with the filtered signal, the angle (angle of arrival) of each signal source relative to the direction finding device is calculated. Since there are two filters, the wireless direction finding module can give the direction of arrival of the main operating signal and the direction of arrival of the full-band energy respectively. If the energy in a certain direction is abnormally high, that may be the source of interference. The third wireless signal data includes the power of the main operational signal in the target area. The calculation formula for the main operational signal power in the target area obtained by the first power statistics module from the first wireless signal data includes: ,in, Indicates the power of the main operating signal in the target area; This represents the data in channel I after passing through the first digital filter; This represents the data from the Q-channel after passing through the first digital filter; N represents the number of sampled data points, where the range of the number of sampled data points is set to [10K, 100K]. The second power statistics module analyzes the second wireless signal data to obtain the following formula for calculating the sum of the power of all wireless signals in the target area: ,in, This represents the sum of the power of all wireless signals in the target area; This represents the data in channel I after passing through the second digital filter; This represents the data in the Q channel after passing through the second word filter. Based on the power of all wireless signals in the target area and its comparison with the main operating signal power, the formula for determining the target power value with the highest power among all wireless interference signals in the target area is as follows: ,in, This represents the target power value with the highest power value among all wireless interference signals in the target area.

[0043] In complex electromagnetic environments, there can be numerous interference sources. The processing capabilities of direction-finding modules, decoding modules, and the final interference location system are all limited. It's impossible to simultaneously track hundreds of interference sources with high precision. Often, the single most powerful interference accounts for 80% of the total interference energy and is the primary cause of communication quality degradation. The power of the interference signal directly determines its destructive power. The most powerful interference is most likely to suppress the main operating signal, causing receiver saturation or a sharp drop in the signal-to-noise ratio. To find this most powerful interference, the contributions of the main signal and background noise need to be separated from the total power. After obtaining the total interference, the system combines the scanning results of the second digital filter at different bandwidths, or utilizes the separation capability of the wireless direction-finding module for incoming waves from different directions, to decompose the mixed interference into individual independent interference source powers. By scanning in the frequency domain using a narrowband filter, the power value at each frequency point can be measured. If the power at a certain frequency point is much higher than that of adjacent frequencies and does not belong to the main signal, then it is a candidate interference source. The system sorts the power of all detected individual interference sources and selects the target power value with the highest power. The interference corresponding to this maximum value is usually the one closest to the monitoring point, with the highest transmission power, or the best propagation conditions. Determining this maximum target power value and its corresponding frequency triggers the subsequent precise processing flow. Based on this information, the main control unit instructs the switching array to stably connect the antenna channel to the frequency band where the interference occurs, and instructs the wireless direction-finding module to continuously track this strongest interference source and calculate its precise angle of arrival (AOA). The system allocates the main computing resources (FPGA resources, CPU time) to processing this strongest interference, while maintaining low-priority polling monitoring for those interferences with very low power and temporarily harmless nature.

[0044] To achieve comprehensive monitoring, the bandwidth of the detected spectrum in the target area can be set to three times the bandwidth of the main operating signal in the target area. In practice, the starting point for power statistics in the digital domain is the digitized IQ signal output by the AD chip. Since the RF switch is switched to the corresponding antenna under the control of the main control unit, the IQ signal obtained at this time is the IQ signal obtained by a specific antenna. Simultaneously, the down-conversion frequency is also controlled by the main control unit, so the IQ signal obtained at this time is the IQ signal of a specific frequency band corresponding to a specific antenna. At the same time, the main control unit also sends two data points to the power judgment module: firstly, for digital filter 1, the bandwidth of the digital filter corresponding to the detected useful signal; secondly, for digital filter 2, the bandwidth of the useful signal multiplied by three. Figure 5As shown, the LTE signal has a useful bandwidth of 1790MHz-1800MHz. Therefore, digital filter 1 has a bandwidth of 10MHz and a center frequency of 1795MHz; digital filter 2 has a bandwidth of 30MHz and a center frequency of 1795MHz [TT16.1]. The reason for setting filter 2 in this way is that interference from adjacent channels may affect the main signal. Although the main operating signal operates on a specific frequency, interference signals do not necessarily fall exactly within this frequency. Many destructive interferences occur precisely next to the main signal. When a strong signal is transmitted in a channel adjacent to the main signal, due to the non-ideal selectivity of the receiver, the energy of this adjacent channel signal will "leak" into the main signal band, leading to a decrease in the signal-to-noise ratio. If the monitoring bandwidth is only set to the bandwidth of the main signal (1 times), then the system will not be able to see this approaching adjacent channel threat at all. When two strong signals from different frequency bands (such as F1 and F2) are mixed on a nonlinear device, new frequency combinations are generated, such as "2F1-F2" or "2F2-F1". These products often fall near the main signal. Extending the monitoring range to three times the bandwidth of the main signal is generally sufficient to cover the potential range of third-order intermodulation interference generated by strong out-of-band signals falling into the main signal region. Real signals are not ideally rectangular; they have roll-off and adjacent-channel leakage. The main signal itself has side lobes in addition to the main lobe. These side lobes extend beyond the main signal bandwidth. To accurately assess the impact of the main signal on adjacent channels, and the impact of adjacent channel signals on the main signal, a larger range needs to be observed. Expanding the monitoring bandwidth to three times can capture most of the out-of-band radiation of the main signal, as well as the main energy of adjacent channel signals. Co-channel interference: falls within the main signal band (within 1 times the bandwidth). Adjacent-channel interference: falls on channels adjacent to the main signal (between 1 and 2 times the bandwidth). Blocking interference: a wideband strong signal that may cover the main signal and its sides (3 times the bandwidth or wider). Setting the monitoring bandwidth to three times can cover most of the common interference types mentioned above. Setting it too wide (e.g., 10 times) provides a more comprehensive view but leads to a surge in data volume and increased processing pressure; setting it too narrow (e.g., 1.5 times) may miss strong adjacent-channel interference located at a slightly greater distance. From a digital signal processing perspective, this 3x setting is also related to the sampling rate. To monitor a signal with a bandwidth of "B" without distortion, the sampling rate needs to be at least "2B". However, to monitor a bandwidth of "3B", the sampling rate needs to be increased to "6B".

[0045] As can be seen from the above description, this application can determine the relevant information of the target wireless interference signal with the strongest interference in the target area based on the first feature data, the fourth feature data and the target power value. The process will be described below, and the process may include the following: Step S301: Determine whether the target power value exceeds the preset sixth threshold.

[0046] Specifically, to distinguish between "meaningful interference" and "harmless background noise," ensuring that computational resources and response actions are focused only on truly destructive targets, a sixth threshold can be determined after the target power value is identified. This sixth threshold can be set to -90dBm. In wireless communication, not all received signals need to be considered "interference." Thermal noise and extremely weak spurious signals are always present in the environment. In typical wireless communication systems, -90dBm is a critical value. Above -90dBm (e.g., -80dBm, -70dBm): signals are generally considered "significantly impactful." For many communication receivers, signals of this strength are sufficient to affect their automatic gain control (AGC) or directly raise the noise floor. Below -90dBm (e.g., -100dBm, -110dBm): signals are typically close to or below the lower limit of receiver sensitivity for many systems. Signals at this level are likely just long-range spurious emissions, harmless background noise, or the receiver's noise floor itself. The sixth threshold acts like a sieve, classifying weak signals with power below -90dBm as "background electromagnetic environment" and not triggering alarms; only signals above -90dBm are added to the "potential threat" list for further analysis. If the threshold is set too low (e.g., -120dBm), the system becomes extremely sensitive, and even a tiny spark or distant lightning could trigger an alarm. In a complex electromagnetic environment, there could be hundreds or even thousands of weak signals below -90dBm. If the system decodes, locates, and fuses all these signals, computing resources will be exhausted instantly, leaving the system too busy handling trivial tasks to detect truly large interference (-50dBm). If the monitoring screen constantly displays "weak interference detected" alarms, maintenance personnel will gradually become desensitized and eventually ignore all alarms. Setting a -90dBm threshold ensures that only signals with sufficient energy and the potential to cause real impact will attract attention. Setting the sixth threshold to -90dBm aligns with the "sensitivity" baseline for most communication systems. Many commercial communication systems (such as walkie-talkies, IoT terminals, and mobile phones) typically have a reference sensitivity between -95dBm and -105dBm. This means that when the interference signal power reaches -90dBm, it is close to or exceeds the noise floor of these receivers, capable of substantially impacting communication. For communication to be interrupted, the interference signal usually needs to be a certain multiple (e.g., 3dB to 10dB stronger) than the useful signal. If the main operating signal is around -100dBm, -90dBm interference has the potential to suppress the main signal. Therefore, -90dBm is a reasonable "starting line." This threshold acts as a "decision switch" in determining the strongest interference. If it is less than -90dBm, the system considers it merely "background," marks it as low priority, does not trigger an alarm, but still records it in the fourth feature data as the environmental baseline.If the value is greater than -90dBm: the system considers this a "threat" and immediately initiates advanced analysis, fusing the first and fourth feature data to generate a final interference report. In practice, this preset value of -90dBm can be fine-tuned according to environmental parameters. If the target area is an extremely quiet rural area, the threshold can be appropriately lowered; if it is a noisy urban area, the threshold can be appropriately raised to maintain the accuracy of the alarm. Therefore, if the target power value exceeds the preset sixth threshold, step S302 is executed.

[0047] Step S302: The wireless signal corresponding to the target power value is identified as the target interference signal that needs to be monitored in a directional manner. Based on the first feature data, the fourth feature data and the target power value, the relevant information of the target wireless interference signal with the strongest interference in the target area is determined.

[0048] Specifically, when the target power value exceeds the sixth threshold of -90dBm, the transition from "suspected" to "confirmed" is completed. At this point, the wireless signal corresponding to the target power value can be identified as the target interference signal that needs to be monitored and directed. Based on the first feature data, the fourth feature data, and the target power value, the relevant information of the strongest interference target wireless signal in the target area is determined. As mentioned above, -90dBm has reached or exceeded the sensitivity baseline of most communication receivers. Signals below the sixth threshold fall under the category of "environmental monitoring," and the system only needs to record them. Signals above the threshold enter the category of "threat response," and must be locked as targets, initiating the highest priority tracking, direction finding, and analysis resources. After identifying the target interference signal, the three sets of data can be fused to determine "how destructive" the target interference signal is through the target power value. A complete "target interference signal related information" usually contains the following six categories of information, forming a 360-degree threat profile: 1. Basic identity information includes signal type (whether it is single-tone interference, noise FM, pulse interference, or complex digital modulation interference (such as OFDM, QPSK)), modulation method (what are the specific modulation parameters? How much bandwidth? This helps to determine the type of interference source (is it illegal image transmission, cheating device or military jammer)), and protocol characteristics (if part of the frame structure can be decoded, it may contain device ID, MAC address or specific synchronization word).

[0049] 2. Intensity and energy information, including: received power (signal strength measured at the current monitoring point (e.g., -65dBm)), field strength estimation (derived from antenna parameters the electric field strength (V / m) generated by the interference source at the monitoring point), and distance estimation (derived from the propagation model the approximate distance (near / medium / far) of the interference source from the monitoring point).

[0050] 3. Spatial orientation information (from the wireless direction finding module, although not directly mentioned, but usually accompanied by the second feature data) includes: angle of arrival (AOA) (which horizontal direction the signal comes from (e.g., 30 degrees east of north)), pitch angle (whether the signal comes from a high or low place (helps to determine whether the interference source is ground equipment or a low-altitude drone)), and position estimation (if there are multiple stations coordinating, latitude and longitude coordinates can be given).

[0051] 4. Environmental impact assessment includes: energy percentage (the percentage of the power of the interfering signal in the total power of the frequency band (e.g., 85%)), frequency band pollution index (the extent of damage to the "cleanliness" of the target frequency band), and correlation analysis (the degree of correlation between the occurrence of the interfering signal and the decline in the quality of the main operating signal).

[0052] 5. Temporal behavior characteristics, including: start and end times (precise timestamp of the start of the interference, duration, and whether it occurs periodically), and power change trends (is the interference signal increasing or decreasing? Is it a stable transmission or a burst of pulses?).

[0053] 6. Threat level and response recommendations, including: hazard rating (high / medium / low (based on a comprehensive assessment of intensity, identity, and environmental proportion)) and recommended actions.

[0054] In practice, the digital intermediate frequency board of each wireless signal direction finding device also includes an interference signal judgment module. This module can also perform direction finding on target interference signals. The process is described below and may include the following: Step S401: The bandwidth and frequency information of the target interference signal are analyzed by the interference signal judgment module of each wireless signal direction finding device. At the same time, based on the frequency information of the target interference signal, the antenna array of the target frequency band that obtains the maximum power of the target interference signal in each wireless signal direction finding device is determined. Based on the coordinate information of each wireless signal direction finding device in the target area, the direction corresponding to the antenna array of the target frequency band is determined as the azimuth of the target interference signal.

[0055] Specifically, the conclusions drawn from wide and narrow band filtering and power statistics may only be mathematically hypothetical targets, not actually reflected in physical space. The interference signal judgment module, through precise analysis, can confirm whether the interference is narrowband or wideband. If it is wideband interference, subsequent direction finding may need to target its center frequency; if it is narrowband interference, it needs to target its precise frequency. By analyzing frequency information, false targets that appear to be interference but are actually harmonics or intermodulation products of known signals can be eliminated. Only by confirming its precise frequency and bandwidth characteristics can it be ensured that the target to be direction-finded is indeed the real interference source that needs to be eliminated. Each wireless signal direction finding device is equipped with multiple antenna arrays, including low-frequency, mid-frequency, and high-frequency arrays. The reception efficiency of signals in different frequency bands varies drastically on different arrays. Suppose that analysis reveals the interference signal's frequency to be 2.4GHz. If an intermediate-frequency antenna array is incorrectly used for reception, due to the mismatch between antenna size and wavelength, a large portion of the signal energy will be lost, resulting in noisy direction finding results. The phase center of the antenna array is only stably known when its operating frequency band matches the signal frequency. Using an antenna with an unmatched frequency band can result in a non-linear phase response, leading to completely incorrect azimuth measurements. In practice, signals are reflected. The same interference source may reach the direction-finding device simultaneously via direct waves and multiple reflected waves. A multi-band antenna array typically consists of antenna elements distributed in different locations in space. When interference signals arrive, the signal strength received by each antenna element is different due to reflection and phase superposition. The interference signal identification module compares the power of the signals received by each antenna element at the same frequency to find the element or subarray with the highest power. Generally, the direction with the highest power is closest to the direction of the direct wave of the signal. Simply synthesizing the signals from all antenna elements for direction finding might yield a direction pointing towards a reflector wall. However, by filtering by maximum power, the direction finding is prioritized based on the most reliable and strongest wavefront. The direction given by the antenna array is usually a relative angle to the device's own axis. Each wireless signal direction-finding device has precise GPS coordinates and orientation information. The interference signal detection module must convert the direction relative to the antenna array into an absolute azimuth relative to the north of the earth. Only after obtaining this absolute azimuth can the command center draw a line on the map between 45 degrees east of north measured by device A and 30 degrees west of north measured by device B. The intersection of the two lines is the true geographical location of the interference source.

[0056] Step S402: Cross-verify the direction of the target interference signal determined by each wireless signal direction finding device, and determine the intersection area of ​​the directions of the target interference signals determined by all wireless signal direction finding devices as the location of the target interference signal.

[0057] Specifically, a single wireless direction-finding device can only provide the angle of arrival (AHA) of the target interference signal, i.e., a ray originating from the device's location and pointing towards the interference source. Due to multipath effects, environmental noise, or minor errors in the device itself, the direction line provided by a single station may not be perfectly accurate. Redundant observations can be created by introducing the direction lines from a second or third station. If the three lines intersect at a single point, the measurement is highly accurate; if they form a triangle, the most probable center point can be found using geometric algorithms, effectively suppressing random errors. Two non-parallel lines define a point on a plane. Therefore, when two direction-finding devices in different locations simultaneously aim at the same interference source, the unique intersection of their two direction lines is the physical location of the interference source. In real-world environments, due to signal fluctuations and measurement errors, multiple direction lines often do not perfectly intersect at a single point, but rather form an intersection area. Determining this area as the location of the target interference signal provides a probability range. This range is more realistic than an isolated point and better guides subsequent approximation searches. In complex terrain or urban environments, a device may be unable to directly see the interference source due to building obstructions, and its direction line may be based on reflected signals. By introducing the direction lines from a third or fourth device for cross-verification, it can be found that a certain line does not intersect with other lines significantly. In this case, the data from that station can be determined as unreliable and discarded, relying instead on the cross-verification results from the remaining two or three stations. This greatly improves the robustness of the positioning system. Specifically, in the process of direction finding the target interference signal using a network of multiple wireless signal direction finding devices, it is necessary to set the initial position antenna arrays for the low-frequency, mid-frequency, and high-frequency antenna arrays of each wireless signal direction finding device, and to offset the other antenna arrays in each frequency band relative to their initial positions in the corresponding directions. The process for each wireless signal direction finding device to determine the azimuth of the target wireless interference signal is as follows: First, the baseband filter of the target frequency band is set to the bandwidth of the target interference signal; then, the main control unit polls each antenna array of the corresponding target frequency band to obtain the power of the interference wireless signal received by each antenna array of the target frequency band; then, the power of the interference wireless signal received by each antenna array of the target frequency band is compared, and the azimuth of the wireless signal with the highest power value is determined as the azimuth of the target interference signal; and then, for all wireless signals in the target area that need to be monitored and oriented, excluding the target interference signal and the main operating signal whose azimuth map has been determined, the operation of analyzing the relevant information of the target interference signal through the interference signal judgment module to determine the bandwidth and frequency of the target interference signal is repeated until the azimuth of all wireless interference signals in the target area that need to be monitored and oriented is determined in sequence.

[0058] Specifically, each interference signal has its unique bandwidth. Before direction finding, the baseband filter bandwidth of the digital intermediate frequency board must be set to be exactly the same as the interference signal. If the filter bandwidth is set too wide, a large amount of out-of-band noise will flood the receiver, causing a decrease in the signal-to-noise ratio and unstable direction finding angles. If the bandwidth is set too narrow, only a small portion of the interference energy can be measured, failing to reflect the full picture of the interference, which will also lead to inaccurate direction finding. An antenna array in a frequency band is usually composed of antenna elements distributed in different locations in space. Due to multipath effects, interference signals may be reflected into these antenna elements from different directions. The main control unit polls the power received by each antenna element in turn. By comparison, it finds the element or subarray with the highest power value. Usually, the direction with the highest power is closest to the direct wave direction of the signal. Simply taking the average or combining of all antennas may result in a direction pointing towards the reflector wall. By filtering by the maximum power value, it can be ensured that the direction finding is based on the most reliable and strongest wavefront. The interference signal with the highest power is usually the most serious threat to normal communication and most likely to cause communication disruption, and should be eliminated immediately. Strong signals have a high signal-to-noise ratio, small direction-finding error, and the most accurate positioning. Addressing the strongest interference first allows for rapid restoration of basic communication order. In practice, the target area may contain numerous interfering signals. If the search stops after locating the strongest, weaker but equally illegal signals will be missed. Therefore, after determining the azimuth map of a target interference signal, the process can continue sequentially, analyzing the relevant information of the target interference signal through the interference signal judgment module, excluding the target interference signal and the main operational signal whose azimuth map has been determined, for all wireless signals requiring directional monitoring in the target area. This process determines the bandwidth and frequency of the target interference signal. The first loop identifies the strongest interference signal. In the second loop, the strongest interference signal and the known main operational signal are treated as background and subtracted from the total power. At this point, the secondary interference signals that were previously masked by the strong signal will emerge in the spectrum. Each identified interference signal is removed from the monitoring list, and the search continues until all interference signals meeting the criteria are located.

[0059] Amplitude comparison method: This method compares the amplitudes A1 and A2 received by antennas with different directional orientations (such as directional antennas) to determine the direction. Knowing the signal power (amplitude and phase) on each antenna, the system can not only determine direction but also perform beamforming in the digital domain. By adjusting the weighting of the received signals from each antenna, the array's received beam can be "pointed" in a specific direction. The specific process is as follows: 1. By statistically analyzing the power of each antenna, the direction of the interference signal can be calculated. The power calculation formula is as follows: P0= Where P0 is the sum of the power of the I and Q channels of the corresponding digital signal from the AD conversion; P=0 means switching to the corresponding antenna element (for example, a low-frequency antenna is composed of 6 elements in a low-frequency antenna array), and switching to the 0th low-frequency element has a time period, for example, the switch is held in the 0th element for 100ms, and the first digital signal is obtained during the 0th time period of these 100ms; P=n means that the AD signal obtains the last digital signal during the 100ms time period of the corresponding antenna element; this system realizes the switching of low, medium and high frequency antennas through polling, and a similar action is used to count the power when switching to each element.

[0060] 2. Calculate how much phase compensation needs to be applied to the signal of each antenna in order to form a receiving beam in this direction.

[0061] 3. After compensation is applied, interference signals from this direction will be superimposed in phase and enhanced; while signals from other directions (including the main operating signal, if the directions are different) will be weakened due to phase asymmetry.

[0062] Without separate power statistics, beamforming is impossible, and the system can only passively receive signals omnidirectionally, unable to spatially distinguish and suppress interference. Separately calculating the power of each antenna is crucial for system self-testing and calibration. During system initialization, the same calibration signal is injected into all antennas, and the power (amplitude) and phase of each channel are calculated separately. If a significant difference is found between the power statistics of a particular antenna and the others, the amplitude / phase inconsistency of that channel can be calculated and compensated for in subsequent processing. If an antenna is damaged or its feeder is loose, the power statistics it receives will be much lower than those of other antennas. The system can promptly detect and alarm for hardware faults by monitoring the independent power values ​​of each antenna in real time. For example, in actual measurements, the antenna arrays for low, medium, and high frequencies are strategically positioned to ensure that all antennas can achieve a 360° sensing range. For instance, ... Figure 3 As shown, a deployment method of 6, 6, 12 can be considered, where the deployment of transparent antennas can reduce the overall size of the system. Each low, medium, and high frequency antenna meets the requirements of the amplitude comparison algorithm, namely, the spacing between two elements exceeds half a wavelength. The system sets the initial training value (the initial value of the training uses the antenna 0 position as the starting position). For example, this system will set a large loop from low frequency to medium frequency to high frequency; then, the inspection range from low frequency to high frequency will be set for each frequency band in the low / medium / high frequency range. That is, first complete the 360° monitoring range of low frequency, then complete the 360° monitoring range of medium frequency, and finally complete the 360° monitoring of high frequency; for example, the low frequency supports 900-1800MHz, and the frequency points to be monitored are 927MHz±15kHz, 1000MHz±15kHz, and 1785MHz±10MHz, then the workflow is as follows: 1) First, set the monitoring start time, which is time 1, and number the timers clockwise to complete the numbering of low, medium and high frequency timers; 2) The control unit connects the RF switch array to interfaces 1 and 2, and connects it to antenna interfaces A and B. The mapping relationship between the two is accurate.

[0063] a) The control unit will control downconverters A and B to use 927MHz as the center frequency at time T1 to detect wireless signals. It will use the output data signals from the dual-channel AD converter to determine the amplitude of interference signals and white noise interference, and use the MUSIC algorithm unit to determine the direction of the interference signals.

[0064] b) The control unit will control downconverters A and B to use 1000MHz as the center frequency at time T2 to detect wireless signals. The output data signals from the dual-channel AD converter will be used to determine the amplitude of interference signals and white noise interference for one period, and the direction of interference signals will be determined using the MUSIC algorithm unit.

[0065] c) The control unit will control downconverters A and B to use 1785MHz as the center frequency at time T3 to detect wireless signals. The output data signals from the dual-channel AD converter will be used to determine the amplitude of interference signals and white noise interference, and the direction of interference signals will be determined using the MUSIC algorithm unit.

[0066] 3) The control unit connects the RF switch array to interfaces 3 and 4, and then to antenna interfaces A and B, ensuring accurate mapping between them. Steps a), b), and c) are repeated to complete the determination of the second low-frequency antenna.

[0067] 4) Repeat this process to determine the antennas for all frequency bands, complete one scan, and output the corresponding analysis results; 5) Even better, a grid design can be used for airports or areas to be detected, with each device deployed on a different grid, enabling real-time monitoring of the entire area. The direction finding focus grid of multiple devices is the location of the interference signal.

[0068] In practice, after determining the power of the main operating signal and the sum of the powers of all wireless signals in the target area, a power retrieval analysis can be performed on all wireless signals in the target area, excluding the main operating signal, sequentially from low frequency band to high frequency band, based on a preset seventh threshold as the step unit. This determines the frequency point of the wireless signal with the maximum operating frequency within the detected spectrum range of the target area and its corresponding bandwidth, which are then used as the interference frequency point and interference signal bandwidth of the wireless interference signal in the target area. The preset seventh threshold can be set to 1K.

[0069] Specifically, this method aims to thoroughly investigate weak or sudden interference that might be located in the high-frequency band. Assume there is a strong signal (high power) in the low-frequency band and a weak signal (low power) in the high-frequency band. The total power will primarily be contributed by the strong low-frequency signal, while the weak high-frequency signal will be completely "masked" in the sum. Moving point by point in the frequency domain with a seventh threshold as the step, it's equivalent to using a small window (resolution bandwidth) to peer into every corner of the spectrum. Even if the high-frequency signal is very weak, as long as it exceeds the background noise, this "small window" can extract it separately, preventing it from being masked by the strong low-frequency signal.

[0070] The wireless signal direction finding device provided in this application can be applied to wireless signal direction finding equipment, such as terminals: mobile phones, computers, etc. Optionally, Figure 6 The hardware structure block diagram of the wireless signal direction finding device is shown below. Figure 6The hardware structure of the wireless signal direction finding device may include at least one processor 1, at least one communication interface 2, at least one memory 3, and at least one communication bus 4. In this application, the number of processor 1, communication interface 2, memory 3, and communication bus 4 is at least one, and the processor 1, communication interface 2, and memory 3 communicate with each other through the communication bus 4. The processor 1 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement this application; the memory 3 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk storage device; wherein, the memory stores a program, and the processor can call the program stored in the memory, the program being used to implement various processing flows in the aforementioned terminal wireless signal direction finding scheme. This application also provides a readable storage medium that stores a program suitable for processor execution, the program being used to implement various processing flows in the aforementioned terminal wireless signal direction finding scheme. Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. The various embodiments can be combined with each other. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for finding the direction of a wireless signal, characterized in that, The method includes: Based on the wireless signal information to be monitored in the target area, at least two wireless signal direction finding devices are deployed in the target area, and an antenna array with a shared radio frequency link is constructed for each wireless signal direction finding device. The full-band wireless signals of the target area are collected through the antenna array of the shared radio frequency link of each of the wireless signal direction finding devices; Analyze the full-band wireless signals of the target area collected by all wireless signal direction finding devices to determine relevant information of the target interference signals in the target area.

2. The method according to claim 1, characterized in that, The step of deploying at least two wireless signal direction finding devices for the target area based on the wireless signal information to be monitored in the target area, and constructing an antenna array with a shared radio frequency link for each wireless signal direction finding device, includes: Based on the wireless signal information to be monitored in the target area, determine the number of wireless signal direction-finding devices that need to be deployed in the target area; Based on the parameters of all operating wireless signals in the target area, set the parameters of each wireless signal direction-finding device in the target area; Based on the parameters of all operating wireless signals in the target area and the parameters of each wireless signal direction-finding device; Based on the wireless signal information to be monitored in the target area, a low-frequency antenna array, an intermediate-frequency antenna array, and a high-frequency antenna array are constructed for the shared radio frequency link antenna array of each wireless signal direction finding device. The number of antennas in each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device is set according to the size of the antenna array in each frequency band. The number of low-frequency antenna arrays is a preset first threshold, the number of intermediate-frequency antenna arrays is a preset second threshold, and the number of high-frequency antenna arrays is a preset third threshold. The coverage area formed by the antenna arrays of each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device is a preset first angle. The horizontal beamwidth of the constructed low-frequency antenna array is set to a preset second angle; the horizontal beamwidth of the intermediate-frequency antenna array is set to a preset third angle; and the horizontal beamwidth of the high-frequency antenna array is set to a preset fourth angle. The initial position of the antenna array in each frequency band is set to the coordinate position corresponding to a preset fifth angle. The antenna arrays of each frequency band of the shared radio frequency link antenna array of each wireless signal direction finding device are arranged using a preset layout strategy. The antenna arrays of each frequency band of each wireless signal direction finding device are deployed according to the antenna array layout strategy of each frequency band of the shared radio frequency link of each wireless signal direction finding device. Based on the number of wireless signal direction finding devices required for the target area, each wireless signal direction finding device is deployed sequentially in the target area, and the coordinate information of each wireless signal direction finding device in the target area is recorded, so as to comprehensively collect all wireless signals in the target area.

3. The method according to claim 1, characterized in that, Each wireless signal direction finding device includes a signal control system, and each signal control system includes a main control unit, a switching array, and a digital intermediate frequency board. The process of acquiring full-band wireless signals from the target area via an antenna array connected to a shared radio frequency link of each of the wireless signal direction finding devices includes: The main control unit of the signal control system of each wireless signal direction finding device controls the switching array, and sequentially connects the antenna arrays of each frequency band of the shared radio frequency link of each wireless signal direction finding device according to the wireless signal direction finding requirements of the target area. The main control unit controls the digital intermediate frequency board to adjust the local oscillator of the radio frequency module of the target frequency band to the intermediate frequency point or the zero frequency point according to the frequency of the antenna array of the target frequency band currently connected to the switching switch array. The digital intermediate frequency board includes a dual-channel AD chip. Based on the intermediate frequency point or zero frequency point of the antenna array in the target frequency band, the target wireless signal in the target area is acquired by the dual-channel AD chip. The target wireless signal includes the main operating signal and various interference signals in the target area.

4. The method according to claim 3, characterized in that, The analysis of all wireless signal direction-finding devices collecting wireless signals across the entire frequency band of the target area, and the determination of relevant information regarding target interference signals in the target area, includes: Analyze the full-band wireless signals collected by each wireless signal direction finding device in each target area, and obtain the wireless signal analysis results of each wireless signal direction finding device. By comprehensively analyzing the wireless signal analysis results of all wireless signal direction finding devices in the target area, relevant information of target interference signals in the target area is determined; Each wireless signal direction finding device's digital intermediate frequency board further includes a first digital filter, a second digital filter, a wireless direction finding module, a wireless decoding module, a first power statistics module, and a second power statistics module. The analysis of the full-band wireless signals collected by each wireless signal direction finding device in each target area yields the wireless signal analysis results for each device, including: The wireless signals of the target area collected by each wireless signal direction finding device are filtered by the first digital filter and the second digital filter to obtain the first wireless signal data and the second wireless signal data. The bandwidth of the second digital filter of each wireless signal direction finding device is set to the bandwidth of the spectrum detected in the target area. The bandwidth of the spectrum detected in the target area is set according to the wireless signal detection requirements of the target area. The first wireless signal data corresponding to each wireless signal direction finding device is output to the first power statistics module for analysis to obtain the third wireless signal data, wherein the third wireless signal data includes the power of the main operating signal in the target area; The second wireless signal data is output to the second power statistics module for analysis to obtain the fourth wireless signal data, wherein the fourth wireless signal data includes the sum of the power of all wireless signals in the target area; Based on the power of all wireless signals in the target area and its power relative to the main operating signal, determine the target power value with the highest power value among all wireless interference signals in the target area; The third and fourth wireless signal data are output to the wireless decoding module for decoding processing to obtain the first feature data of the wireless signal in the target area. The third and fourth wireless signal data are output to the wireless direction finding module for direction finding analysis to obtain the second characteristic data of the wireless signal in the target area. Based on the first feature data, the fourth feature data, and the target power value, relevant information of the target wireless interference signal with the strongest interference in the target area is determined.

5. The method according to claim 4, characterized in that, The bandwidth of the spectrum detected in the target area is set to three times the bandwidth corresponding to the main operating signal in the target area; The calculation formula for the main operating signal power of the target area obtained by the first power statistics module of each wireless signal direction finding device through analyzing the first wireless signal data includes: in, This indicates the power of the main operating signal in the target area; This represents the data from channel I after passing through the first digital filter; This represents the data in the Q-path after passing through the first digital filter; N represents the sampled data points, where the number of sampled data points is set to [10K, 100K]. The second power statistics module analyzes the second wireless signal data to obtain the following formula for calculating the sum of the powers of all wireless signals in the target area: in, This represents the sum of the power of all wireless signals in the target area; This represents the data from channel I after passing through the second digital filter; This represents the data in the Q channel after passing through the second word filter; Based on the power of all wireless signals in the target area and its comparison with the main operating signal power, the formula for determining the target power value with the highest power value among all wireless interference signals in the target area includes the following: ,in, This represents the target power value that has the highest power value among all wireless interference signals in the target area.

6. The method according to claim 5, characterized in that, The relevant information of the target wireless interference signal with the strongest interference in the target area is determined based on the first feature data, the fourth feature data, and the target power value. Determine whether the target power value exceeds a preset sixth threshold; If the target power value exceeds the preset sixth threshold, the wireless signal corresponding to the target power value is determined as a target interference signal that needs to be monitored in a directional manner. Based on the first feature data, the fourth feature data, and the target power value, relevant information of the target wireless interference signal with the strongest interference in the target area is determined.

7. The method according to claim 4, characterized in that, The method also includes: After each wireless signal direction finding device determines the main operating signal power and the sum of the power of all wireless signals in the target area, each wireless signal direction finding device performs power retrieval analysis on all wireless signals in the target area, excluding the main operating signal, in order from low frequency band to high frequency band, based on a preset seventh threshold as the step unit. The frequency point of the wireless signal with the maximum operating frequency in the detected spectrum range of the target area and its corresponding bandwidth are determined as the interference frequency point and interference signal bandwidth of the wireless interference signal in the target area.

8. The method according to claim 6, characterized in that, Each wireless signal direction finding device's digital intermediate frequency board also includes an interference signal judgment module, and the method further includes: The interference signal judgment module of each wireless signal direction finding device analyzes the bandwidth and frequency information of the target interference signal. At the same time, based on the frequency information of the target interference signal, the antenna array of the target frequency band that obtains the maximum power of the target interference signal in each wireless signal direction finding device is determined. Based on the coordinate information of each wireless signal direction finding device in the target area, the direction corresponding to the antenna array of the target frequency band is determined as the azimuth of the target interference signal. The direction of the target interference signal determined by each wireless signal direction finding device is cross-verified, and the intersection area of ​​the directions of the target interference signal determined by all wireless signal direction finding devices is determined as the azimuth of the target interference signal. In the process of finding the direction of the target interference signal by networking multiple wireless signal direction finding devices, it is necessary to set the initial position antenna array of the low frequency, medium frequency and high frequency antenna arrays of each wireless signal direction finding device, and offset the other antenna arrays in each frequency band relative to the initial position antenna array in the corresponding direction. The process by which each wireless signal direction-finding device determines the location of the target wireless interference signal is as follows: Set the baseband filter of the target frequency band to the bandwidth of the target interference signal; The main control unit polls each antenna array in the corresponding target frequency band to obtain the power of the interfering wireless signal received by each antenna array in the target frequency band. By comparing the power of the interfering wireless signals received by each antenna array in the target frequency band, the azimuth of the wireless signal corresponding to the highest power value is determined as the azimuth of the target interfering signal. The process of analyzing the relevant information of the target interference signal through the interference signal judgment module and determining the bandwidth and frequency of the target interference signal is repeated for all wireless signals in the target area that need to be monitored and oriented, excluding the target interference signal and the main operating signal whose azimuth map has been determined, until the azimuth of all wireless interference signals in the target area that need to be monitored and oriented is determined in sequence.

9. A wireless signal direction finding device, characterized in that, include: One or more processors, and a memory; the memory stores computer-readable instructions that, when executed by the one or more processors, implement the steps of the wireless signal direction finding method as described in any one of claims 1 to 8.

10. A readable storage medium, characterized in that: The readable storage medium stores computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform the steps of the wireless signal direction finding method as described in any one of claims 1 to 8.

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