随机PRI的LPI波形相参积累

随机脉冲重复频率(PRI)脉冲波形能够增加电子支援措施（ESM）利用重频分选侦收雷达辐射源信号的难度，提高雷达复杂对抗环境下的抗侦收能力。利用非均匀离散傅里叶变换(NUDFT)对这种低截获概率（LPI）波形进行脉冲多普勒（PD）处理时，距离模糊引起目标所处距离门走动，导致目标能量分散至多个模糊距离单元。为此，提出一种基于时间窗口的离散傅里叶变换(TWDFT)算法，实现了距离模糊条件下目标能量的相参积累。对TWDFT算法和加权副瓣抑制的性能进行了分析。仿真结果表明，基于TWDFT的PD处理在距离模糊时不存在目标能量分散问题，通过优化波形设计能够改善加权后目标主副瓣比。

Coherent accumulation of LPI waveform with random PRI

Random PRI(Pulse Repetition Interval) pulse waveform can increase the difficulty of radar emitter interception for ESM(Electronic Support Measures) using PRI sorting and improve the ability of anti-interception under complex countermeasure environment.Range ambiguity will cause the migration of target range-gate and lead to target energy dispersion across multiple ambiguous range units,while using NUDFT(Non-Uniform Discrete Fourier Transform) algorithm to process this LPI(Low Probability of Intercept) waveform.This paper presents a time-window based DFT algorithm(TWDFT),which implements the coherent accumulation of target energy under the condition of range ambiguity.With this algorithm,the coherent accumulation of target energy is implemented under the condition of range ambiguity.The principle of the algorithm and performance of weighted side lobe reducing is analyzed.Experimental results show that there is no target energy dispersion in TWDFT-based PD(Pulse Doppler) processing with range ambiguity.Optimizing the waveform design can improve the weighted main-to-side ratio.