摘要
非线性调频信号具有低截获性的特点,其脉压具有信噪比损失小的优势,但其主副瓣比指标对多谱勒较敏感,当存在大的运动目标时会影响其附近的小目标的检测。文中在分析PD(脉冲多普勒)雷达的常规处理流程的基础上,通过交换脉冲压缩与FFT(快速傅里叶变换)的顺序,在频域的各滤波器组分别对脉压系数进行多谱勒频移补偿,大大改善了非线性调频信号的主副瓣比指标对多谱勒的敏感性。从理论仿真看,该方法可以有效改善非线性调频波形的主副瓣随多普勒的变化特性,同时对脉压的信噪比损失也有一定的改善;该方法计算量小,具有实时性。
NLFM signal has advantage of LPI and its pulse compression has the advantage of low SNR loss. But its performance of PSL is sensitive to Doppler, so the detection of a small target beside a strong one will suffer＇from it. Based on analysis of the common processing procedure of the PD radar and by exchanging the order of PC and FFT, the coefficient of PC is calibrated in every Doppler bank, which significantly reduces the sensitivity of PSL to Doppler. According to simulation results, this approach can effectively improve the PSL of NLFM pulse compression with changing of the Doppler frequency, and can decrease the loss of SNR of pulse compression. The computation of this approach is small and it can be realized in real time.
出处
《信息化研究》
2009年第5期45-46,50,共3页
INFORMATIZATION RESEARCH
