动基线时差测量系统多脉冲相参积累算法研究

Multi-Pulses Coherent Integration Algorithm for Moving-Baselines Time Difference Measuring System

主要研究了动基线时差测量系统采用多脉冲相参积累算法对低信噪比条件下运动目标的有效检测问题。通过分析雷达回波信号的特性,指出目标高速运动所引起的包络走动是影响积累性能的主要因素。选用了插值补偿包络走动后进行相参积累的算法。仿真结果表明,在低信噪比条件下,插值补偿相参积累算法能实现对运动目标弱小信号的有效检测,其积累性能优于未做补偿积累算法的性能。

How to detect moving target in low SNR condition for moving-baselines time difference measuring system is studied, using multi-pulses coherent integration algorithm. Firstly, the characteristic of radar＇ s return is analysed. The main factor that influences the performance of coherent integration is the envelope＇ s migration between range cells. Finally, a detection algorithm, which is based on envelope interpolation, replacement and compensation, is proposed to resolve this problem. Simulation results shows that using this algorithm can realize weak moving targets detection more effective than using FFT coherent integration in low SNR condition.