Costas阵列编码与线性调频SFR信号分析

线性调频-Costas频率步进雷达信号是一种很有研究价值的雷达信号。针对线性调频-Costas频率步进雷达信号的需要研究总结了一套生成N阶Costas序列的方法，同时结合实际需要生成了多组64阶Costas序列。这些Costas阵列是具有良好相关特性的最佳离散信号，将Costas阵列编码与线性调频频率步进雷达信号结合起来构成了线性调频-Costas频率步进雷达信号。通过对该信号的模糊特性的理论和仿真结果的分析表明，这种信号不仅能够较大地抑制信号的模糊旁瓣的幅度。而且能解决距离-速度的多普勒耦合问题。

Analysis of Coding With Costas Arrays and LFM-SFR Signal

LFM-Costas stepped frequency radar (SFR) signal is an important radar signal. This paper presents a method producing N-steps Costas sequence aiming at the need in LFM-Costas stepped frequency radar (SFR) signal, and builds many sets of 64-step Costa arrays according to practical needs. These Costas sequences are optimum discrete signals with good correlation characteristic. Coding with Costas arrays is combined with LFM stepped frequency radar (SFR) signal to generate LFM-Costas stepped frequency radar (SFR) signal. The ambiguity function is analyzed in detail. The results of theoretic analysis and simulation show that, by using this kind of signal, the ambiguity sidelobe is well suppressed and the range-velocity coupling in the stepped frequency radar is also significantly resolved.