4results about How to "Improve interference effect" patented technology

The application provides a synthetic aperture radar active composite jamming method and system, the method comprising: acquiring intermediate frequency radar signals to be jammed, radar related parameters and control parameters; calling DSP and multiple FPGA calculation boards to calculate modulation coefficients corresponding to each false scattering point according to pre-downloaded deception templates and radar related parameters; generating deception jamming signals corresponding to the intermediate frequency radar signals according to the intermediate frequency radar signals and the modulation coefficients corresponding to each false scattering point; generating suppression jamming signals corresponding to the intermediate frequency radar signals according to the control parameters; and determining composite jamming signals corresponding to the intermediate frequency radar signals according to the deception jamming signals and the suppression jamming signals corresponding to the intermediate frequency radar signals. The application can obtain composite jamming signals, has better jamming effect, is not easy to expose the position of the jammer, and has lower cost of the jammer. The signal processing architecture of DSP and FPGA is adopted, the calculation performance of the system is improved, and the real-time performance of system simulation is ensured.

The invention discloses a coherent comb spectrum suppression interference method, and relates to the field of electronic countermeasures. The method comprises the following steps: receiving a radar signal, and converting the radar signal into a digital IQ signal; a plurality of coherent suppression interference modules are used for carrying out parallel modulation processing on the digital IQ signals in a digital domain, each module independently carries out modulation, and I-path signals and Q-path signals output by all the modules are added to generate coherent comb spectrum suppression interference signals, the modulation processing comprises the following steps: performing Doppler frequency modulation on the signal after amplitude modulation; performing Doppler noise modulation on the signal after Doppler frequency modulation; the modulated signal is converted into an analog signal, and the analog signal is radiated to a radar after up-conversion and amplification; wherein the coherent comb spectrum suppression interference signal is used for suppressing a real target signal at a radar receiving end. The method has the advantages of high coherence, quick response and adaptive adjustment, real target signals can be effectively submerged, and the interference effect is improved.

The invention discloses a deception jamming method and device for an azimuth phase coding SAR (synthetic aperture radar), and belongs to the technical field of electronic support system synthetic aperture radar countermeasure. The method comprises the following steps: intercepting an SAR signal, carrying out two-dimensional structured phase stripping by constructing an inverse distance modulation operator and an inverse azimuth modulation operator, and estimating to obtain an azimuth phase sequence; carrying out complex domain differential operation on the estimated azimuth phase sequence, constructing a phase consistency measurement index and minimum consistency order mapping, and identifying a coding structure of the phase consistency measurement index and the minimum consistency order mapping; constructing a linear least square problem based on an identification result, and reconstructing an azimuth phase sequence; and performing phase consistent modulation including convolution modulation on the intercepted signal to generate a deception jamming signal. According to the method, complete matching of the interference signal and the SAR receiving filter is realized, and effective deception interference can be implemented on a new system SAR adopting random, primary, secondary and grouped phase coding.

The application discloses a kind of multi-jammer cooperative resource allocation method and equipment for networking radar, the method includes: determining multi-jammer cooperative jamming networking radar scene;Scene contains opposite radar, our target and our jammer;Obtain the position and speed of each opposite radar, our target and our jammer at current time;According to position and speed, determine the measurement value of each opposite radar to each our target at current time;According to measurement value, calculate the bayesian information matrix of each our target at current time;Based on the resource constraint of our jammer and the bayesian information matrix of each our target at current time, construct multi-jammer cooperative resource allocation model;Using augmented lagrange multiplier method, solve multi-jammer cooperative resource allocation model, obtain the solution result that the interference residence time of each our jammer to each opposite radar at current time is characterized.The application can quickly allocate the resource of our jammer, and the calculation complexity is low.