线性调频-Costas频率步进信号分析及宽带合成处理

针对宽带宽角扫描相控阵雷达系统高精度测距、测速应用需求,提出了脉间Costas编码跳频、脉内线性调频调制的信号形式。通过对信号建模及距离-多普勒二维模糊度函数的分析表明,该信号形式综合了线性调频信号和Costas编码的优点,具有接近理想图钉型的模糊函数,可实现距离-速度的二维高分辨率。推导了线性调频-Costas频率步进信号宽带合成的处理方法,并通过仿真验证了该算法的有效性。

Analysis and Synthetic Wideband Processing of Costas-coded Chirp-subpulse Stepped Frequency Radar Signal

Costas-coded chirp-subpulse stepped frequency signal model is proposed for high precision range and velocity measurement in a wide-band wide-angle scanning phased-array radar system. Simulation modeling and two dimensional ambiguity function of this type of signal model is elaborated in this paper, which demonstrates that Costas-coded chirp-subpulse stepped frequency signal has thumbtack-shaped ambiguity function and can realize the high joint resolution of range and velocity. Then a synthetic wideband processing method is proposed and its feasibility and validity is validated by simulation.