摘要
常用的跳频宽带雷达大都是基于发射顺序步进载频的脉冲信号形式,而这种信号的模糊图为斜刀刃形,存在距离-速度耦合,容易造成测距不准和多普勒效应。为了改善高分辨力雷达测距测速性能,提出了在ISAR成像中采用Costas编码脉冲序列,推导并比较了Costas编码脉冲序列和常规步进频脉冲序列的模糊图,分析了Costas编码跳频雷达信号形式,指出它可以消除距离-速度耦合,具有更好的测距和测速性能,并给出了ISAR成像的算法步骤。最后仿真验证了该算法的正确性。
The normal frequency hopped radar is stepped frequency radar. The signal of such radar has knife-edged shape ambiguity figure. It brings on coupling of range and velocity, which may cause inaccurate range measuring and Doppler effect. To improve the performance of high-resolution radar on range/velocity measurement, it is put forward that to use the Costas coded array in ISAR imaging. The ambiguity functions of the Costas array pulse train signal is deduced and compared with the stepped frequency pulse train signal, the returned signal of Costas coded radar is analyzed. The Costas array coded radar signal may eliminate the range/ velocity coupling, and has better measurement performance. The effectiveness of such method is validated by computer simulation.
出处
《电光与控制》
北大核心
2007年第6期176-179,共4页
Electronics Optics & Control
