一种新的相位编码信号多普勒补偿算法研究

摘要

相位编码信号是一种多普勒频率敏感信号,而且码长越大,对多普勒频率越敏感,严重影响了雷达对高径向速度目标和远距离目标探测的能力.该文在分析伪码序列与多普勒容限关系的基础上,提出一种新的伪码调相准连续波雷达的多普勒补偿算法.该算法将回波信号取平方后送到动目标检测(MTD)滤波器中,通过提取回波信号中的多普勒频率信息,进行多普勒补偿.从仿真结果可以看出,该算法能够有效地降低多普勒频率对脉冲压缩结果的影响,验证了方法的可行性.%Phase-coded signal is a Doppler frequency sensitive signal and the signal with longer code length is more sensitive to Doppler frequency, which seriously affects the detection capacity of radar on targets with high radial velocity and remote targets. This paper puts forward a new Doppler compensation algorithm of pseudo-random code phase modulation quasi continuous wave (CW) signal radar based on the analysis of the relation between PN code and Doppler tolerance. The algorithm squares the echo signal and then sends it to MTD filter, and conducts Doppler compensation by extracting Doppler frequency information in the echo signal. The simulation results indicate the algorithm may, effectively reduce the impact of Doppler frequency on pulse compression result, so the feasibility of the algorithm is verified.