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为解决基于GNSS卫星信号的星机多基SAR系统信噪比低的问题,提出几种改善系统信噪比的方法.分析了GNSS卫星信号源的信号特性及GPS信号的雷达模糊函数,研究其作为多基SAR系统发射信号的适用性,推导了雷达方程,并分别对点、面目标的信噪比进行分析.结果表明:作为系统照射源的GNSS信号具有良好的距离、速度分辨特性.采用适当的信号处理方法,可有效改善系统信噪比,满足多基SAR成像的要求.
In order to solve the problem of low signal-to-noise ratio (SNR) of satellite multi-base SAR system based on GNSS satellite signals, several methods to improve signal to noise ratio of the system are proposed.The signal characteristics of GNSS satellite signal and the radar ambiguity function of GPS signal are analyzed, As the applicability of transmitting signals in multi-base SAR system, the radar equation is deduced and the signal-to-noise ratio of point and plane targets are respectively analyzed.The results show that the GNSS signal as a system illumination source has good distance and velocity resolution characteristics, Appropriate signal processing methods can effectively improve the system signal to noise ratio to meet the requirements of multi-base SAR imaging.