37 results about "Narrowband interference" patented technology

The invention discloses a 5G microwave amplifier performance test method based on automatic spectrum analysis, and relates to the technical field of data analysis, by introducing a disturbance excitation and recovery behavior comparison mechanism, the short-time dynamic response of an amplifier spectrum is actively induced, the point-by-point difference of a reference spectrum, a disturbed spectrum and a recovery spectrum is analyzed, and the performance of a 5G microwave amplifier is tested. A response-recovery ratio indicator is constructed to identify a local indentation region that is difficult to perceive in the steady-state spectrum. Compared with a traditional method depending on a frequency spectrum smoothing strategy, the method has the advantages that the problem of slight indentation in a high-frequency bandwidth is easy to cover, specific frequency point response is excited through frequency perturbation, power fluctuation or narrow-band interference, and the disturbance response and recovery capability difference of the amplifier become an evaluation basis; therefore, the recognition accuracy of nonlinear response and early failure characteristics is improved, and the stability pre-judgment capability of the 5G amplifier is enhanced.

The present disclosure discloses a wireless communication method, a wireless device and a computer storage medium. The wireless communication method includes generating a protocol data unit PPDU and performing a frequency domain resource duplication on the protocol data unit PPDU in units of a resource unit RU to obtain a final protocol data unit PPDU. This method can effectively solve the problem of narrowband interference caused by HB BLE devices to wireless devices.

Methods, devices, and systems for mitigating the impact of high power narrowband interference on hybrid automatic repeat request (HARQ) performance in URLLC systems. In a first aspect, this application relates to implementation of frequency bundled transmissions (FBT) that may enable a device to transmit different individual redundancy versions (RVs) of the same uplink data for multiple preconfigured frequency resources simultaneously or near simultaneously. In a second aspect, the application relates to implementation of FBT with frequency domain repetition, which may enable a device to transmit a redundant version bundle of the same uplink data simultaneously or near simultaneously on multiple pre-configured frequency resources.

When an OFDM radio system which uses a wide frequency band is interfered with by another narrow-band radio system, the interference can frequently be compensated but the transmission quality decreases drastically. Thus, narrow-band interferers in an OFDM radio system are determined according to the invention whereby none of the subscribers of the radio system transmits in a defined time slot or scan slot but all switch at the same time into the receiving mode. If there is interference (P1, P2), it is detected in this time slot. Countermeasures are taken individually in all the mobile devices, in particular the detection of the frequency and strength of the narrowband interference (P1, P2) and the configuration of a flexible notch filter (140) in the time range to the detected frequency and strength. The scanned received signal (RXS) is then filtered in the time range, i.e. before the FFT (120) and the OFDM channel estimation (130) by the correspondingly configured notch filter (140). The notch (S1, S2) of the notch filter thereby acts in the transmission function like a natural break when receiving data.

The embodiment of the present disclosure discloses a power line communication narrowband interference detection and suppression device, method and chip, and relates to the technical field of power line communication. The device comprises: a narrowband detection and suppression unit acquires an OFDM signal and synchronization state information; when it is determined that the current state of the channel is an idle state based on the synchronization state information, the OFDM signal is detected in a parallel mode, a first detection result is obtained and sent to a master control unit; in response to the working mode being switched to a series mode, narrowband interference suppression is performed and the suppressed OFDM signal is detected, a second detection result is obtained and sent to the master control unit; the master control unit receives the first detection result and the second detection result; when it is determined that there is narrowband interference based on the first detection result, the working mode of the narrowband detection and suppression unit is switched to the series mode; and whether the narrowband interference disappears is determined based on the second detection result. The accurate detection and suppression of narrowband interference are realized by a simple device with low performance requirements.

This invention relates to the field of smart meter communication data acquisition technology, and discloses a method for anti-interference data acquisition in smart meter communication based on multi-carrier modulation technology. The method includes using multi-carrier modulation to perform frequency division processing on the signal during data transmission, combining channel state perception and dynamic subcarrier allocation strategies to avoid interference frequency bands in real time, and enhancing data robustness through time-frequency joint coding. This application can effectively suppress narrowband interference and impulse noise, improving the communication reliability and data acquisition accuracy of smart meters in complex electromagnetic environments.

This invention addresses the problem that the direct zeroing method used in existing satellite navigation signal processing frequency domain FFT notch filtering easily leads to power loss near interference frequencies, affecting signal integrity. It proposes a narrowband interference suppression system and method for BeiDou navigation. The narrowband interference suppression system includes a BeiDou RF front-end module, a high-speed ADC sampling module, a digital down-conversion (DDC) module, a signal distributor and buffer module, an interference detection and parameter estimation unit, an interference suppression execution unit, a baseband correlation and demodulation module, and a navigation and positioning result output module. A cascaded array of IIR notch filters is constructed using a cascaded array module. A steep transition band is achieved through small-order serial units, and the stopband width of the notch filters can be flexibly adjusted via a convergence factor. This enables precise suppression of extremely narrow stopband interference at different bandwidths, filtering out signals only at interference frequencies, effectively avoiding impact on surrounding useful BeiDou signals and preventing spectrum leakage.

The invention discloses a self-adaptive narrowband interference suppression method and device for power line communication, and the method comprises the following steps: S1, receiving a mixed signal, and carrying out the decorrelation processing of the mixed signal, so as to obtain a decorrelation signal; s2, inputting the decorrelated signal into a filter, and estimating the narrowband interference signal at the current moment by the filter according to the filter coefficient at the current moment to obtain a narrowband interference estimation signal; s3, calculating the energy of the decorrelation signal; s4, subtracting the received signal at the current moment from the narrowband interference estimation signal to obtain an error signal; and S5, according to the filter coefficient at the current moment, the error signal and the energy of the decorrelation signal, calculating the filter coefficient at the next moment by using a power normalized least mean square algorithm, so that the algorithm maintains the characteristic of insensitivity to the power change of the input signal, the calculation resource consumption is greatly reduced, and the calculation efficiency is improved. And the feasibility and efficiency of the algorithm in practical application are improved.

The utility model provides a Beidou No.3 miniaturized Beidou positioning communication device and communication equipment. The device comprises a clock circuit, a power supply circuit, and a radio frequency front-end circuit, a radio frequency chip, a baseband chip and an interface circuit which are connected in sequence, the power supply circuit is connected with the clock circuit, the radio frequency front-end circuit, the radio frequency chip, the interface circuit and the baseband chip, and the clock circuit is connected with the baseband chip; the radio frequency front-end circuit comprises a signal receiving circuit and a signal transmitting circuit which are connected with a radio frequency chip; the signal receiving circuit comprises a first receiving channel and a second receiving channel, the first receiving channel is used for receiving a B3 intermediate frequency signal of the Beidou RNSS, and the second receiving channel is used for receiving an S intermediate frequency signal of the RDSS; the signal transmitting circuit is used for transmitting a first radio frequency signal received from the radio frequency chip to the antenna so as to transmit the first radio frequency signal. The integrated design of the RNSS and the RDSS can be realized, and the RNSS signal is supported to resist narrowband interference and forwarding deception interference.

The invention provides a power Internet of Things communication method and device, and the method comprises the steps: dynamically distributing a frequency hopping point for each sub-channel in each bit interval at a transmitting end, enabling the frequency of a sub-carrier borne by data to jump along with time, enabling the subsequent transmission to automatically jump to other frequency points even if a specific frequency band is interfered at a certain moment, and enabling the transmission efficiency to be improved. Therefore, narrowband interference is actively avoided; meanwhile, after a receiving end detects that the current micro-slot transmission fails, retransmission is triggered immediately in the next available micro-slot without waiting for a traditional scheduling period, and retransmission data is mapped to a new frequency point in combination with a frequency hopping mechanism, so that continuous retransmission failure caused by continuous existence of interference is effectively avoided, accumulated retransmission time delay is remarkably shortened, and the transmission efficiency is improved. And reliable transmission is ensured to be completed in a time delay window allowed by the service.

Techniques are provided for overcoming narrowband interference with notch filters. An example method for determining, with a receiver, a distance to a satellite vehicle includes receiving a signal from the satellite vehicle, determining one or more notch filter configurations, determining a pseudo-random noise code and a Doppler frequency associated with the signal, determining a code phase correction value based at least on the one or more notch filter configurations, the pseudo-random noise code, and the Doppler frequency, and calculating the distance to the satellite vehicle based at least in part on the signal and the code phase correction value.

The application discloses a wireless communication method, a wireless device and a computer storage medium, and the wireless communication method comprises the following steps: generating a protocol data unit (PPDU); and performing frequency domain resource replication on the PPDU in a resource unit (RU) to obtain a final PPDU. The method can effectively solve the problem of narrowband interference of an HB BLE device on a wireless device.

The invention relates to the technical field of frequency hopping communication anti-interference, and discloses a frequency domain narrowband interference suppression threshold correction method and system. The method comprises the following steps: cutting off a zero intermediate frequency time domain signal according to N points and carrying out fast Fourier transform to obtain a spectrum data sequence, calculating a spectrum mean value and multiplying the spectrum mean value by a threshold factor to obtain an initial threshold value sequence, correcting by comparing a ratio of a current threshold value to a previous cache threshold value, judging and zeroing an interference frequency point according to the corrected threshold value, and outputting a time domain signal through inverse fast Fourier transform. According to the method and the device, the problems of interference missing detection and useful signal misjudgment caused by threshold value fluctuation at the moment of frequency hopping switching are solved, and the accuracy and the stability of frequency domain narrowband interference suppression are improved.

The application discloses a laser air speed tube device based on Rayleigh scattering laser radar and belongs to the field of laser remote sensing, which comprises an outgoing light path composed of a pulsed fiber laser, a first beam splitter, a beam expander and a launching barrel; a receiving light path comprising an arranged telescopic receiving system, a 2*1 polarization maintaining fiber coupler, a collimating lens, a narrowband interference filter, a polarization beam splitter prism and an F-P etalon, one output of the F-P etalon being provided with a first focusing lens, a second beam splitter and a first signal channel detector, and the other output of the F-P etalon being provided with a third focusing lens, a third beam splitter and a first signal channel detector; and a close-range signal detection light path comprising a common receiving section light path between the 2*1 polarization maintaining fiber coupler of the receiving light path and the second beam splitter and the third beam splitter; the first focusing lens is arranged between the first beam splitter beam splitting light path and the 2*1 polarization maintaining fiber coupler; and the first and second close-range signal detectors are arranged at the rear of the second and third beam splitting light paths respectively.

The invention relates to the technical field of radio compass angle resolving, in particular to an automatic gain control radio compass angle resolving method, which comprises the following steps of: introducing two-stage automatic gain control through a complete process of signal acquisition, digital-to-analog conversion, frequency domain conversion, two-stage gain control, frequency conversion and azimuth angle calculation; the first-stage gain control realizes feedback control based on a frequency domain judgment result, and narrow-band interference and pulse noise in a frequency domain can be filtered in a targeted manner; the second-stage gain control realizes fine gain adjustment based on time domain signal amplitude judgment, and further stabilizes the signal amplitude; meanwhile, through the synergistic effect of two-stage gain control, subsequent frequency conversion and resolving links can be carried out based on stable and clean signals, the resolving process is simplified, resolving errors caused by signal interference are avoided, high-precision resolving of the azimuth angle is achieved, the overall process logic is clear, engineering implementation is easy, and the method is suitable for large-scale popularization and application. The method is suitable for aviation navigation and other scenes with high reliability requirements.

The invention discloses a cable partial discharge signal denoising method based on RSVD and an improved wavelet packet threshold method. The cable partial discharge signal denoising method comprises the following steps: decomposing a noisy partial discharge PD signal into K IMF components through CEEMDAN; constructing Hankel matrixes for the IMF components one by one, decomposing the Hankel matrixes through random singular value decomposition RSVD, then performing zero setting on singular value abrupt change components, and eliminating narrowband interference; by calculating and comparing cross correlation coefficients of the IMF components, selecting a proper feature component closest to an original signal; and reconstructing the feature components obtained by screening, and eliminating the residual white noise in the superposed signal by adopting a wavelet packet threshold function method of an improved threshold function to obtain a new partial discharge PD signal. According to the method, the effects of extracting the signal-to-noise ratio and the waveform reduction degree of partial discharge PD are good, and the calculation efficiency is better than that of a singular value decomposition SVD algorithm.

Capacitive seat occupancy detection and classification system (16), in particular vehicle seat occupancy detection and classification system (16), comprising an impedance measurement circuit (18) and a control and evaluation unit (30), characterized in that the impedance measurement circuit (18) comprises the following: - a signal voltage source (20) designed to apply periodic electrical measurement signals to an output terminal (22), wherein a capacitive sensor (36) can be electrically connected to the output terminal (22) to receive the electrical measurement signals, and wherein the signal voltage source (20) is designed to generate periodic measurement signals of N different fundamental frequencies, where N is a natural number of at least 3, - a sensing current measuring circuit (24) designed to determine complex sensing currents generated in the capacitive sensor (36) by the provided periodic measurement signals of at least N different fundamental frequencies, - a signal processing unit (26) designed to to determine a complex impedance from each of the specified sensing currents with reference to a complex reference potential, and to provide output signals (28) that are representative of the complex impedances that have been determined at at least N different fundamental frequencies, and that the control and evaluation unit (30) is designed to to receive the output signals (28) provided by the signal processing unit (26), to compare each of the complex impedances that have been determined at at least N different fundamental frequencies with predetermined threshold values, based on the result of the comparison, to determine a seat occupancy class for each of the complex impedances that have been determined at at least N different fundamental frequencies and to determine a final seating class derived by a majority decision from the seating classes determined for each of the complex impedances determined at one of the at least N different fundamental frequencies, where N is equal to [(2 xn) + 1], where n is a natural number greater than 1, representing the number of potential resonances or electromagnetic (EM) narrowband interferences.

A method implemented by a Wireless Transmit / Receive Unit (WTRU) is disclosed. The method may include mapping resource allocation information for data transmission to a set of virtual resource block bundles. The method may further include mapping the set of virtual resource block bundles to a set of first physical resource block bundles based on a first mapping function. Additionally, the method may include mapping the set of first physical resource block bundles to a set of second physical resource block bundles. The second physical resource block bundle set may include both the first and second physical resource block bundles. The first physical resource block bundles may be usable for data transmission, while the second physical resource block bundles may not be usable for data transmission.

The invention discloses a method and a system for identifying and suppressing narrowband interference of a power line, and belongs to the technical field of power line carrier communication. The method comprises the following steps: segmenting a power line signal output by an ADC (Analog to Digital Converter), and carrying out time-frequency conversion on each segment of power line signal; converting the amplitude of the frequency domain signal to obtain converted data and differential data; performing dual judgment to obtain a plurality of narrowband interference estimated frequency points; respectively calculating correlation ratios for the plurality of narrowband interference estimated frequency points, and when the maximum correlation ratio exceeds a correlation ratio threshold value, identifying the narrowband interference estimated frequency point corresponding to the maximum correlation ratio as a narrowband interference frequency point; based on the narrowband interference frequency point, performing single frequency point suppression on the power line signal to obtain a suppressed power line signal; and iteratively executing the steps on the suppressed power line signal to obtain a final suppressed power line signal. According to the method and the system, the influence of signal distortion, high bit error rate and stability reduction caused by narrowband interference on the transmission system is solved, and the reliability of the transmission system is improved.

The invention relates to the technical field of unmanned aerial vehicle interference, in particular to a method and device for interfering an unmanned aerial vehicle. The method comprises the following steps: dividing a collected time domain signal into a plurality of data frames according to a preset frame length, and sending the time domain signal to an unmanned aerial vehicle by a control device; performing fast Fourier transform on each data frame to obtain a complex frequency spectrum sequence of each data frame; obtaining a first power value of each frequency in each data frame based on the complex frequency spectrum sequence of each data frame, and calculating average power between the first power values belonging to the same frequency in each data frame; determining a target frequency corresponding to the average power greater than a preset power threshold, and matching the target frequency with a preset frequency hopping frequency set; and when the target frequency is matched with a target frequency hopping frequency in the frequency hopping frequency set, sending a narrowband interference signal to the unmanned aerial vehicle based on a frequency control word of the target frequency hopping frequency. The method can improve the interference effect.

The utility model discloses a receiving optical system with an unlimited incident light angle of an optical filter, belongs to the technical field of detection imaging, and aims to solve the problem that the performance of a narrow-band interference optical filter of the conventional receiving optical system is influenced by the incident angle of the incident light. Comprising a first lens group, an aperture diaphragm, a second lens group, a first micro-lens array, a narrow-band interference filter and a second micro-lens array which are coaxially and sequentially arranged from front to back, a micro-lens unit of the second micro-lens array is a positive lens, the aperture diaphragm is located on an object space focal plane of the second lens group, an image space telecentric imaging lens group is imaged on a primary image plane, and the image space telecentric imaging lens group is located on a secondary image plane. The primary image plane coincides with the image space focal plane of the first micro-lens array, and the micro-mirror units of the first micro-lens array and the micro-mirror units of the second micro-lens array are in one-to-one correspondence and are aligned front and back. The image space telecentric imaging lens group can modulate the main light of each imaging view field to be parallel to the optical axis, thereby preventing the performance of the narrow-band interference optical filter from being affected by the incident angle of the incident light.

This invention provides a method and system for echo interference detection in a multi-satellite close-range formation distributed SAR system. Specifically, it includes: first, inputting raw echo data from the multi-satellite close-range formation distributed SAR system, assuming the system has M satellites; then, performing channel equalization on the raw echo data and transforming it to the azimuth time-range frequency domain; extracting azimuth and range samples from the processed results; then, detecting time-continuous narrowband interference using a covariance matrix constructed based on the azimuth samples; detecting broadband interference using a covariance matrix constructed based on the range samples; then, fusing the interference detection results; and finally, outputting the final interference detection result. This invention solves the problem of echo interference detection in multi-satellite close-range formation distributed SAR systems and provides important support for on-board and ground-based imaging processing in such systems.

The application discloses a kind of sequential optimization ISAR multi narrowband interference detection and suppression method, it is related to radar signal processing technical field, including: obtaining echo signal, constructs radar range imaging model under narrowband interference environment;Based on radar range imaging model, construct anti narrowband interference waveform optimization model;The spectrum of echo signal is divided into several equal-length sub-frequency bands, the amplitude modulation coefficient of each sub-frequency band is set to the same value, the amplitude modulation coefficient of each sub-frequency band is solved using GA algorithm, and the sub-frequency band where narrowband interference is located is roughly estimated;The proportion of each sub-frequency band in the spectrum is solved using PSO algorithm, and the frequency band where narrowband interference is located is precisely estimated;Based on the estimation result of the frequency band where narrowband interference is located, a spectral notch filter is constructed, and interference suppression is achieved after matched filtering.The present application can obtain accurate and optimized waveform power spectrum estimation result under multi narrowband interference environment.

The application relates to a satellite navigation narrow-band interference real-time suppression method based on power inversion. The method comprises the following steps: segmenting and windowing a continuous satellite navigation digital intermediate frequency signal, converting the signal to a frequency domain through FFT, realizing power inversion through unit circle projection to attenuate narrow-band interference, determining an effective frequency point index range according to a signal center frequency and a nominal bandwidth, zeroing out out-of-band spectral lines, recovering a time domain signal through IFFT, and finally recombining and outputting through overlapping post-processing. The method does not require prior information and threshold judgment throughout the process, can blindly and adaptively suppress interference, solves the problem of signal-to-noise ratio deterioration under a wide sampling bandwidth, has strong real-time performance, small signal distortion, and is suitable for multiple navigation systems.

The invention discloses a synthetic aperture radar (SAR) satellite echo interference feature enhancement and suppression method, which comprises the following steps of: transforming an original echo data matrix containing interference of a synthetic aperture radar to a distance frequency domain-azimuth time domain, and constructing an amplitude matrix of the distance frequency domain-azimuth time domain; determining a narrowband Gabor kernel matrix and a broadband Gabor kernel matrix by combining characteristics of narrowband interference and broadband interference in a distance frequency domain-azimuth time domain and combining narrowband Gabor transformation parameters and broadband Gabor transformation parameters, and performing convolution filtering processing on the amplitude matrix to obtain a narrowband interference characteristic enhancement matrix and a broadband interference characteristic enhancement matrix; determining a narrowband interference mask matrix and a broadband interference mask matrix by using respective corresponding mean values and standard deviations, constructing a final interference mask matrix based on the narrowband interference mask matrix and the broadband interference mask matrix, processing the distance frequency domain-azimuth time domain matrix, constructing the distance frequency domain-azimuth time domain matrix after interference suppression, and converting the distance frequency domain-azimuth time domain matrix into a two-dimensional time domain, and obtaining a two-dimensional time domain echo matrix after interference suppression.

Methods and devices for narrowband interference detection and mitigation during reception of wireless signals. Exemplary interference detection methods or devices observe a frequency domain representation of a received wireless signal to measure power related values, identify a maximum power value and an associated sub-carrier, count sub-carriers having power related values below a threshold power value, detect and locate narrowband interference based on the counted number of sub-carriers. Accordingly, exemplary interference mitigation methods or devices modify the wireless signal based on sub-carriers determined to be affected by narrowband interference in a time domain, frequency domain, or both time and frequency domains. An embodiment of the method or device processes the wireless signal to suppress frequencies associated with the narrowband interference locations by one or more notch filters in the time domain, the device then modifies power related values associated with the sub carrier affected by narrowband interference in the frequency domain. 25 WIRELESS COMMUNICATION METHODS AND DEVICES FOR NARROWBAND2023202743 18 Jul 2023 ! "#$ %&'"($ ) %$ *$ %$ + ) ) ,-. / 01 ) ' 2"34 5 ,-. / 06 7%%" 8 9" 5) !":" 5 :"' * 9 5 5 20 23 20 27 43 0 3 M ay 2 02 3 1 / 10 100 102 104 May 118 114 116 RADIO HOST MAC PHY Processor Processor Processor RF RF Transmitter Receiver System Bus Peripheral Input / Output 112 Memories bus Interfaces 106 120 108 110 FIG. 1A 150 168 164 162 166 HOST MAC Upper Lower PHY PHY Rx Analog ADC Filters / Far Async Rx RF_RX FIFO row 152 154 156 158 160 FIG. 1B 1 / 10 114 106 120 108 110 150 164 162 166 HOST MAC Lower Rx ("""" ADC 152 154 156 158 160

This invention discloses a time-domain spread spectrum enhancement data anti-interference coding method and apparatus, belonging to the field of communications, comprising the following steps: obtaining a time-domain spreading code; configuring the L-STF, L-LTF, and L-SIG fields in the traditional preamble of a WiFi signal according to the WiFi standard protocol; performing time-domain spread spectrum once on all sequences after L-SIG in the configured WiFi signal preamble using the spreading code from the original frequency of the signal to obtain the spread signal; using the L-STF and L-LTF fields for time-frequency synchronization, and then multiplying the synchronized signal with the spreading code matrix for coherent merging to achieve time-domain despreading of the synchronized signal; performing channel estimation on the despread signal using the LTF field; and demodulating the data sequence signal after the despread LTF or L-LTF field based on the estimated channel to achieve data encoding. This application utilizes time-domain spread spectrum to solve narrowband interference, while frequency-domain spread spectrum has a weaker ability to solve narrowband interference; simultaneously, the benefits of both can be superimposed.

The invention discloses a power line communication anti-interference method, system and device and a storage medium, which are used in the technical field of power communication, and the method comprises the following steps: obtaining an initial time domain signal of a power line; performing pulse interference repair on the initial time domain signal, and converting the first time domain signal into a corresponding first frequency domain signal; constructing an ADMM model according to the first frequency domain signal, and performing joint estimation solution on the ADMM model to obtain an estimated channel response frequency domain vector and an estimated narrowband interference frequency domain vector; determining a narrowband interference type according to the estimated narrowband interference frequency domain vector, and performing anti-interference processing on the first frequency domain signal according to the narrowband interference type to obtain a second frequency domain signal; and performing iterative correction on the second frequency domain signal according to the estimated channel response frequency domain vector and the estimated narrowband interference frequency domain vector to obtain and output a final correction signal. According to the invention, the anti-interference capability of power line communication in a complex communication environment is improved.

The invention discloses an SC-FDE system interference detection method based on a segmented periodogram and frequency domain refinement search, and mainly solves the problems of low interference detection spectrum resolution and poor detection precision in the prior art. According to the implementation scheme, the method comprises the following steps: a transmitting end performs coding, constellation mapping, framing and up-conversion on a service data stream arriving at an upper layer to obtain a radio frequency signal to be transmitted, and the radio frequency signal is superposed with noise and single-tone interference through a channel to generate a receiving signal; the receiving end performs down-conversion and matched filtering on the received signal in sequence so as to recover a received baseband discrete signal; the receiving end determines a frame starting position according to the local pilot frequency sequence and the receiving baseband discrete signal, and extracts a plurality of effective data blocks from the receiving baseband discrete signal according to the frame starting position; estimating a coarse estimation value of the interference frequency by using the extracted data blocks; and searching near the coarse estimation value of the interference frequency to determine the frequency point where the interference is located. The method is high in interference detection precision, low in calculation complexity, easy in hardware implementation and high in data processing real-time performance, and can be used for narrowband interference detection under broadband frequency hopping communication.