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.
关键词
间歇采样转发干扰/波形设计/时频分析/迭代阈值分割算法
Key words
interrupted sampling and repeater jamming/waveform design/time frequency analysis/iterative threshold segmentation algorithm
万方数据