Anti-interrupted sampling and repeater jamming method for intra-pulse frequency and time delay agile radar
Utilizing fast and accurate sampling and forwarding,interrupted sampling and repeater jamming forms false target groups by using the matching filtering characteristics of pulse pressure radar,which seriously affects the performance of target detection and tracking.To solve this problem,an intra-pulse frequency-time-delay agile waveform is designed by combining waveform design and filtering.On this basis,an anti-interrupted sampling and repeater jamming method based on time-frequency analysis is proposed.Firstly,the linear frequency modulation(LFM)signal is divided into multiple sub-pulses,and the random time delay is added between the sub-pulses.Then,the undisturbed sub-pulse is extracted to judge the target location accurately.Combined with the prior information such as the sub-pulses frequency and random time delay,the iterative threshold segmentation algorithm is used to remove the intense jamming signal.Finally,sub-pulse filtering and time-domain filtering are processed by constructing time-frequency and time-domain bandpass filters respectively.Simulation results show that the proposed method has good interrupted sampling and repeater jamming performance under different jamming to signal ratio,signal to noise ratio,and asynchronous sampling conditions.
interrupted sampling and repeater jammingwaveform designtime frequency analysisiterative threshold segmentation algorithm
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