摘要
针对伪码调相连续波(PRC-CW)雷达信号的多普勒敏感性,提出了一种扩展多普勒容限的新方法。该方法将单频脉冲信号和伪码调相信号结合起来,采用两种波形交替发射,在利用插值快速傅里叶变换方法得到各目标对应多普勒频率的基础上,构造相应的多普勒补偿后的信号再进入距离波门进行脉压-快速傅里叶变换处理,消除了原有的多普勒容限的影响,使该体制雷达可以应用于近程高速目标的搜索和跟踪,多普勒频率估计方差接近单频回波时段的Cra-mer-Rao下限。
A novel method to expand the Doppler tolerance is presented to suppress the Doppler sen- sitivity of the pseudo random code continuous wave （PRC-CW） radar signal. It utilizes a composite signal which is a cascade of single frequency pulse and pseudo random phase-coded signal. The Doppler frequencies of targets are firstly estimated based on interpolated fast Fourier transform method and the Doppler compensated signal is constructed. The effect of Doppler frequency on the correlation detection can be efficiently suppressed by processing the compensated signal with pulse compression-fast Fourier transform, which makes the radar suitable for short-range high-speed target detection. The Doppler frequency estimation error is approaching Cramer-Rao lower bounds.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2009年第3期361-365,共5页
Journal of Nanjing University of Science and Technology
关键词
雷达
多普勒测量
容限扩展
伪随机码
脉冲压缩
插值快速傅里叶变换
目标
radars
Doppler measurement
tolerance expansion
pseudo random code
pulse compression
interpolated fast Fourier transform
targets
