A radio signal fusion monitoring method for receiving front end

Abstract

The present invention discloses a radio signal fusion monitoring method for a receiving front end, which belongs to the field of wireless communication. The method performs a first down-conversion process on the radio signal to obtain a first frequency conversion signal, and performs resident monitoring on the radar signal according to the first frequency conversion signal to obtain radar monitoring data; during the resident monitoring time period, the first frequency conversion signal performs a second down-conversion process to obtain a second frequency conversion signal, and performs synchronous monitoring on the communication signal according to the second frequency conversion signal to obtain communication monitoring data; the radar monitoring data and the communication monitoring data are collected to complete radio signal monitoring. The present invention realizes the synchronous collection of radar signals and communication signals, and at the same time, integrates the digital collection of radar signal processing and communication signal processing, and shares processing resources such as FPGA.

Description

Technical Field

[0001] The invention relates to the field of wireless communications, and in particular to a radio signal fusion monitoring method for a receiving front end. Background Art

[0002] Modern electronic warfare mainly includes electronic reconnaissance, electronic interference, electromagnetic attack, etc., among which electronic reconnaissance is the leading basis for implementing other electronic warfare. However, the radar signal reconnaissance and communication signal reconnaissance equipment in current electronic reconnaissance equipment are independent of each other in hardware, and the reconnaissance result data obtained after signal processing are also unrelated to each other, which not only increases the space occupied by equipment and costs, but also makes it difficult to achieve mutual support and comprehensive application of intelligence. Summary of the invention

[0003] The purpose of the present invention is to overcome the problem of independent collection of radar signals and communication signals in the prior art, and to provide a radio signal fusion monitoring method for a receiving front end.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A radio signal fusion monitoring method for a receiving front end is mainly provided, and the method comprises:

[0006] receiving radio signals, the radio signals including radar signals and communication signals;

[0007] Performing a first down-conversion process on the radio signal to obtain a first frequency conversion signal, and performing resident monitoring on the radar signal according to the first frequency conversion signal to obtain radar monitoring data;

[0008] During the resident monitoring period, performing a second down-conversion process on the first frequency conversion signal to obtain a second frequency conversion signal, and synchronously monitoring the communication signal according to the second frequency conversion signal to obtain communication monitoring data;

[0009] The radar monitoring data and communication monitoring data are collected to complete radio signal monitoring.

[0010] As an option, the bandwidth of the first frequency conversion signal is 1 GHz, and the bandwidth of the second frequency conversion signal is 200 MHz.

[0011] As an option, the synchronous monitoring includes:

[0012] During the resident monitoring period, multiple second frequency conversion processes are completed.

[0013] As an option, the method further comprises:

[0014] The collected radar monitoring data and communication monitoring data are fused and displayed in an integrated manner on the same interface.

[0015] Specifically, the fusion processing of the collected radar monitoring data and communication monitoring data includes:

[0016] With the spectrum of communication monitoring data as the background, the frequencies with radar pulses are marked and displayed according to the radar monitoring data.

[0017] Specifically, radar monitoring data and communication monitoring data are integrated and displayed on the same interface, including:

[0018] The radar monitoring data and communication monitoring data are sorted, and the sorting results are uniformly displayed on the data sorting interface.

[0019] The present invention also provides a receiving front end, comprising a first filter, a first low noise amplifier, a first mixer, a second mixer, a radar signal acquisition device and a communication signal acquisition device;

[0020] The input end of the first filter receives a radio signal, the output end of the first filter is connected to the input end of the first low-noise amplifier, the output end of the first low-noise amplifier is connected to the input end of the first mixer, and the output end of the first mixer is connected to a radar signal acquisition device; the output end of the first mixer is also connected to the input end of the second mixer, and the output end of the second mixer is connected to the communication signal acquisition device;

[0021] The first mixer is used for performing a first down-conversion process on the radio signal, and the second mixer is used for performing a second down-conversion process on the first frequency-converted signal.

[0022] As an option, a second filter is provided between the first low noise amplifier and the first mixer, a third filter is provided between the first mixer and the second mixer, and a second low noise amplifier is provided between the second mixer and the communication signal acquisition device.

[0023] The present invention also provides a monitoring system composed of the above-mentioned receiving front end, and the system also includes:

[0024] An antenna array, wherein the antenna array is used to receive radio signals;

[0025] A control end, the control end is used to send a signal of a certain frequency to the receiving front end according to the radio signal, and the control end is also used to control the operation of the receiving front end;

[0026] The host computer is used to receive, analyze and display the data sent by the front end.

[0027] As an option, a gesture detection device is also integrated into the system.

[0028] It should be further explained that the technical features corresponding to the above options can be combined or replaced with each other to form a new technical solution if there is no conflict.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The present invention performs a first down-conversion process on a radio signal to obtain a first frequency-converted signal, and monitors the radar signal according to the first frequency-converted signal. During the time period of monitoring the radar signal, a second down-conversion process is performed to obtain a second frequency-converted signal, and the communication signal is monitored according to the second frequency-converted signal, thereby realizing synchronous collection of radar signals and communication signals.

[0031] (2) The integrated RF front end simultaneously outputs two independent intermediate frequency signals for the acquisition and processing of radar signals and communication signals respectively, so that the processing flows of radar signals and communication signals share FPGA and other processing resources, saving space and reducing costs.

[0032] (3) The collected radar monitoring data and communication monitoring data are integrated and processed, and displayed in an integrated manner on the same interface to achieve mutual support between the two signals and comprehensive application of intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a flow chart of a radio signal fusion monitoring method of a receiving front end.

[0034] Figure 2 It is a structural schematic diagram of the receiving front end of the present invention;

[0035] Figure 3 A flow chart of the monitoring system of the present invention for monitoring radio signals;

[0036] Figure 4 A spectrum diagram for monitoring communications of the present invention;

[0037] Figure 5 It is the communication radar monitoring fusion graph of the present invention;

[0038] Figure 6 This is a diagram showing the radar sorting information display effect of the present invention. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are directions or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The present invention mainly integrates the processing flow of radar signals and communication signals to realize the synchronous collection and resource sharing of radar signals and communication signals.

[0044] Example 1

[0045] In an exemplary embodiment, if Figure 1 As shown, a radio signal fusion monitoring method for a receiving front end is provided, and the method includes the following contents:

[0046] receiving radio signals, the radio signals including radar signals and communication signals;

[0047] Performing a first down-conversion process on the radio signal to obtain a first frequency conversion signal, and performing resident monitoring on the radar signal according to the first frequency conversion signal to obtain radar monitoring data;

[0048] During the resident monitoring period, performing a second down-conversion process on the first frequency conversion signal to obtain a second frequency conversion signal, and synchronously monitoring the communication signal according to the second frequency conversion signal to obtain communication monitoring data;

[0049] The radar monitoring data and communication monitoring data are collected to complete radio signal monitoring.

[0050] Specifically, since radar / communication monitoring equipment is generally a broadband system, microwave front-ends, receivers, power amplifiers, etc. generally overlap each other in terms of frequency bands. In the integrated design of radar and communication, the receiver is generally required to accurately monitor radar and communication signals in the full frequency band with high sensitivity and high intercept probability, while high intercept probability requires the receiving front end to have a large instantaneous working bandwidth, which is a set of conflicting requirements with high sensitivity.

[0051] Radar signals and communication signals have different requirements for bandwidth and sensitivity. The bandwidth of radar signals can reach several hundred MHz to 1GHz and the power is generally high; while the bandwidth of communication signals is relatively narrow, generally not exceeding 200MHz at most, and the power is generally low. Therefore, the monitoring of radar signals requires a large bandwidth and relatively low sensitivity requirements; while the monitoring of communication signals requires a small bandwidth and high sensitivity requirements. Therefore, it is necessary to consider the different requirements of communication signals and radar signals for bandwidth and sensitivity.

[0052] Furthermore, for the received radio signal containing both communication signals and radar signals, a first down-conversion process is performed to obtain a first frequency-converted signal. The first frequency-converted signal is an intermediate frequency signal after down-conversion, and has two uses. First, the first frequency-converted signal meets the bandwidth and sensitivity requirements for monitoring radar signals and can be used for monitoring radar signals. Second, the first frequency-converted signal is subjected to a second down-conversion process to obtain a second frequency-converted signal with a lower frequency. The bandwidth of the second frequency-converted signal meets the sensitivity requirements for monitoring communication signals and is used for monitoring communication signals.

[0053] The key is that when monitoring the radar signal, it will stay for a period of time, during which time the communication signal needs to be monitored to achieve synchronous collection and resource sharing of radar signals and communication signals.

[0054] Example 2

[0055] Based on Example 1, a radio signal fusion monitoring method for a receiving front end is provided, wherein the bandwidth of the first frequency conversion signal is 1 GHz, and the bandwidth of the second frequency conversion signal is 200 MHz. The synchronous monitoring includes:

[0056] During the resident monitoring period, multiple second frequency conversion processes are completed.

[0057] Specifically, the intermediate frequency of the intermediate frequency signal of the first frequency conversion is relatively high, and the bandwidth can reach 1GHz, which can be used for monitoring radar signals, while the intermediate frequency of the intermediate frequency signal of the second frequency conversion is relatively low, and the bandwidth can reach 200MHz, which can be used for monitoring communication signals, meeting the different requirements of communication signals and radar signals for bandwidth and sensitivity. When the bandwidth of the first frequency conversion signal is 1GHz, the intermediate frequency signal after the first frequency conversion will stay for at least 50 milliseconds for monitoring radar signals. Generally speaking, it only takes 2 to 4 milliseconds to collect and process a 200MHz signal, and the collection and processing of 5 200MHz bandwidth signals can be completed within the radar monitoring residence time.

[0058] Example 3

[0059] A radio signal fusion monitoring method for a receiving front end is provided based on embodiment 1, and the method further includes:

[0060] The collected radar monitoring data and communication monitoring data are fused and displayed in an integrated manner on the same interface.

[0061] Furthermore, the fusion processing of the collected radar monitoring data and communication monitoring data includes:

[0062] With the spectrum of communication monitoring data as the background, the frequencies with radar pulses are marked and displayed according to the radar monitoring data.

[0063] Furthermore, radar monitoring data and communication monitoring data are integrated and displayed on the same interface, including:

[0064] The radar monitoring data and communication monitoring data are sorted, and the sorting results are uniformly displayed on the data sorting interface. Sorting is to obtain the parameter information of the signal. For example, radar sorting is to obtain the operating frequency, pulse width, pulse amplitude, pulse arrival time and other parameter information of the radar signal, while communication sorting is to obtain the operating frequency, modulation mode, signal bandwidth, signal amplitude and other information of the communication signal.

[0065] The results of this integration demonstrate the mutual support of the two signals and the comprehensive application of intelligence.

[0066] Example 4

[0067] In this embodiment, a receiving front end is provided, such as Figure 2 As shown, it includes a first filter, a first low noise amplifier, a first mixer, a second mixer, a radar signal acquisition device and a communication signal acquisition device;

[0068] The input end of the first filter receives a radio signal, the output end of the first filter is connected to the input end of the first low-noise amplifier, the output end of the first low-noise amplifier is connected to the input end of the first mixer, and the output end of the first mixer is connected to a radar signal acquisition device; the output end of the first mixer is also connected to the input end of the second mixer, and the output end of the second mixer is connected to the communication signal acquisition device;

[0069] The first mixer is used for performing a first down-conversion process on the radio signal, and the second mixer is used for performing a second down-conversion process on the first frequency-converted signal.

[0070] Furthermore, a second filter is provided between the first low noise amplifier and the first mixer, a third filter is provided between the first mixer and the second mixer, and a second low noise amplifier is provided between the second mixer and the communication signal acquisition device.

[0071] Specifically, the first filter receives the radio signal RF, the first mixer performs down-conversion to obtain an IF2 signal with a bandwidth of up to 1 GHz, the second mixer performs down-conversion on IF2 to obtain an IF3 signal with a bandwidth of up to 200 MHz, and the IF2 after the first frequency conversion will reside for at least fifty milliseconds for radar monitoring, during which time the second mixer can be set to perform frequency conversion. Generally speaking, it only takes 2 to 4 milliseconds to collect and process a 200 MHz signal, and the frequency setting and collection processing of the 200 MHz bandwidth signal can be completed five times within the radar monitoring residence time, thereby realizing the synchronous collection and processing of radar and communication signals.

[0072] Example 5

[0073] Based on Embodiment 4, a monitoring system consisting of the receiving front end is provided, and the monitoring system further includes:

[0074] An antenna array, wherein the antenna array is used to receive radio signals;

[0075] A control end, the control end is used to send a signal of a certain frequency to the receiving front end according to the radio signal, and the control end is also used to control the operation of the receiving front end;

[0076] The host computer is used to receive, analyze and display the data sent by the front end.

[0077] Specifically, Figure 3As shown in the figure, a schematic diagram of the working process of the monitoring system is given. When monitoring starts, the antenna array receives the radio signal, sets the frequency through the control end and sends an RF signal of a certain frequency to the receiving front end. After the first down-conversion at the receiving front end, the first frequency-converted signal is output to the radar signal acquisition device and used for the second frequency conversion. The radar signal acquisition device collects and sorts the radar signal, and the collection and processing time is 50ms.

[0078] Furthermore, after the second down-conversion, IF2 becomes the lower frequency IF3 and is output to the communication signal acquisition device. The communication signal acquisition device collects, sorts and processes the communication signal. The time for a single acquisition process is 5ms, and it takes a total of 25ms to complete 5 acquisitions. The communication signal acquisition can be completed within the acquisition and processing time of the radar signal.

[0079] Further, in the figure, frequency setting refers to setting the frequency of the first mixer, and frequency switching refers to setting the frequency of the second mixer. Figure 4 As shown in the figure, the horizontal axis represents frequency, the vertical axis represents amplitude, f0 represents the frequency of setting, and the entire horizontal axis represents the signal of 1GHz bandwidth. The horizontal axis in the figure is the bandwidth to be detected divided into 10 parts on average. There are 10 frequency points from f0-5 to f0+5, each part represents one tenth of the bandwidth. For example, if the bandwidth is 1GHz, each part is 100MHz, f0-4 represents the frequency point of f0-400MHz, and the other frequency points are calculated in sequence. The bandwidth is 800MHz, each part is 80MHz, and the vertical axis represents the amplitude value of the corresponding frequency point.

[0080] Further, Figure 3 The result of the communication monitoring part on the right side of the flowchart after 5 frequency cuttings (200MHz each time) is calculated based on 200MHz each time. The 5 frequency cuttings are f0-400MHz, f0-200MHz, f0, f0+200MHz and f0+400MHz, during which f0 of the first mixer remains unchanged.

[0081] Further, by Figure 3 From the flowchart, it can be seen that radar monitoring and communication monitoring are carried out in parallel. Figure 5 As shown in the figure, the radar sorting result data is first marked on the background of the communication monitoring spectrum data according to the frequency, and lines are drawn on the frequency points where there are radar pulse signals. In the figure, L1, L2, L3, and L4 represent 4 batches of radar signals respectively. The specific sorting result information of each batch of radar signals can be viewed by double-clicking Figure 5 The radar batch number pops up an identification box, such as Figure 6 As shown, double-click the L1 batch number to get the radar information display about the batch number.

[0082] Furthermore, frequency domain coverage is performed after the fusion display. Because the frequency band range, such as 1GHz to 18GHz, will be input during monitoring, and each frequency setting (f0) can only complete the monitoring of 1GHz bandwidth, 17 frequency settings are required. If the frequency band scan is not completed, the frequency will be set to f0+1GHz to continue looping the above flowchart until all monitoring frequency bands are covered.

[0083] The radar monitoring data and communication monitoring data collected synchronously are uploaded to the host computer for fusion display.

[0084] As electronic reconnaissance equipment used in marine environments, the equipment is required to be able to adapt to environments such as rivers, seas, and oceans, and to be able to work in environments with high salt fog, high temperature, and high humidity. However, electronic reconnaissance is currently mostly used in land environments, and there is a lack of integrated electronic reconnaissance equipment that is adapted to marine environments.

[0085] As electronic reconnaissance equipment used at sea, the equipment is required to be able to adapt to the irregular swaying of surface carriers (ships, floating platforms, etc.). When electronic reconnaissance equipment is carried on a ship or floating platform and works on the sea surface, it is affected by factors such as wind speed and waves, and the hull or floating platform will swing back and forth, shake left and right, and rise and fall in various complex movements. This shaking will change the position and polarization properties of the reconnaissance antenna, which will have a significant impact on various reconnaissance results, thereby affecting the correct judgment of intelligence information.

[0086] We adopt reasonable material selection, three-proof structure design, corrosion environment control, surface coating and chemical treatment, condensation treatment and biological and stress corrosion protection measures to ensure that the equipment can meet the use conditions of various offshore environments and can adapt to the marine tropical monsoon climate, temperature, humidity, salinity, biology, radiation, wind and other special environments.

[0087] In addition, the system is also integrated with attitude detection equipment. The attitude detection equipment includes inertial sensors and magnetometer sensors. The inertial sensor is composed of an accelerometer and a gyroscope, which can obtain the device's azimuth, pitch angle, roll angle and other attitude information in real time. By correlating data with attitude information, the impact of the environment on the reconnaissance results can be reduced, and more accurate intelligence information can be obtained.

[0088] The above specific implementation methods are detailed descriptions of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions and substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A radio signal fusion monitoring method for a receiving front end, characterized in that: The method comprises: receiving radio signals, the radio signals including radar signals and communication signals; Performing a first down-conversion process on the radio signal to obtain a first frequency conversion signal, and performing resident monitoring on the radar signal according to the first frequency conversion signal to obtain radar monitoring data; During the resident monitoring period, performing a second down-conversion process on the first frequency conversion signal to obtain a second frequency conversion signal, and synchronously monitoring the communication signal according to the second frequency conversion signal to obtain communication monitoring data; Collecting the radar monitoring data and the communication monitoring data, fusing the collected radar monitoring data and the communication monitoring data, and displaying them in an integrated manner on the same interface to complete radio signal monitoring; The collected radar monitoring data and communication monitoring data are integrated and processed, and displayed in an integrated manner on the same interface, including: Perform radar data sorting on radar monitoring data to obtain multiple batches of radar signal data, and perform communication data sorting on communication monitoring data to obtain communication monitoring spectrum data; Marking the radar signal data on the background of the communication monitoring spectrum data according to the frequency, and fusing the radar signal data and the communication monitoring spectrum data for display; After the fusion display, frequency domain coverage is performed, and the frequency domain coverage includes: Perform multiple frequency scans on the frequency bands that need to be monitored until all monitoring frequency bands are covered.

2. The radio signal fusion monitoring method of a receiving front end according to claim 1, characterized in that: On the background of the communication monitoring spectrum data, lines are drawn at the frequency points of the radar pulse signals, showing radar signals of different batches.

3. The radio signal fusion monitoring method of a receiving front end according to claim 2, characterized in that: Click on the batch number of the radar signal to get the radar information display of the corresponding batch number.

4. The radio signal fusion monitoring method of a receiving front end according to claim 1, characterized in that: The frequency band to be monitored is 1 GHz to 18 GHz. Each time the frequency is set, 1 GHz bandwidth is monitored, and 17 frequency settings are performed.

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