摘要
频率步进雷达固有的时延-多普勒耦合现象严重影响了运动目标的距离-速度二维联合分辨率.使用具有近似"图钉型"模糊图的跳频脉冲串信号可以消除时延-多普勒耦合,从而同时获得距离和速度的高分辨特性.本文首次推导了跳频脉冲串信号统一形式的模糊函数,分析了编码跳频信号的模糊性和分辨特性,并针对宽带信号下的高速目标提出了一种新的Costas编码跳频信号STRETCH处理方法,有效抑制了传统方法的高旁瓣问题.仿真实验表明Costas编码跳频信号具有较好的测速以及高分辨距离成像性能.
The inherent delay-Doppler coupling of stepped-frequency radar has a severe impact on the united resolution of range and velocity.In order to achieve high resolution ability of range and velocity simultaneously,jumped-frequency radar signal which has thumbtack-shaped ambiguity function is used to resolve the delay-Doppler coupling.In this paper the uniform ambiguity function of jumped-frequency radar signal is deduced for the first time,and then the ambiguity and resolution characteristics of coded-frequency signal are analyzed.Then a novel STRETCH processing method is put forward for high velocity targets on the occasion of wideband Costas-coded stepped-frequency signal,which can resolve high-sidelobe problem effectively.Simulations with MATLAB indicate that the Costas-coded stepped-frequency signal performs well in the velocity measurement and high range resolution imaging.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2010年第10期2426-2429,共4页
Acta Electronica Sinica
关键词
雷达
宽带
测速
模糊函数
COSTAS编码
radar
wideband
velocity measurement
ambiguity function
Costas-coded
