基于相参性的雷达信号分选改进算法

Improved algorithm of radar signal sorting based on coherence

针对雷达信号参数及脉内调制特征相近甚至相同、或者同型编队运动平台雷达的分选问题,提出了基于雷达相参特性的相位差比较和多普勒差的改进分选算法.相位差比较法采用直接进行相参雷达脉冲间的相位差比较而不需要测量频率值的方式进行分选,避免了频率测量精度问题;多普勒差法利用不同位置接收机接收信号混频后的多普勒差信号,将信号下变频到基带再进行相位比较实现分选,一定程度上降低了频率测量误差对分选性能的影响,可以适用于相参雷达信号的分选.最后的仿真结果表明了本文算法的有效性.

In view of the radar signal parameters and intra-pulse modulation characteristics being similar oreven identical and or the sorting of the same type formation movement platform, a sorting algorithm is proposedin this paper, based on the phase difference comparison of the radar coherent characteristics and Dopplerdifference sorting algorithm. In the scheme of phase difference comparison, the phase difference comparisonbetween the coherent radar’s pulses is done directly, and the signals sorting are implemented without measuringthe frequency value, thus the problem of frequency measurement accuracy being avoided. And in the method ofDoppler difference, Doppler difference signals after being mixed are picked up by using the receivers at thedifferent positions, and the phase comparison is carried out for implementing the signals sorting after the signalsare down-conversion to the baseband, and therefore, the impacts of the frequency measurement error on thesorting performance can be lowered to a certain degree, thus being applicable to the radar signal sorting. Finally,simulation results show that the proposed algorithm is of availability.