CINRAD/SA天气雷达双PRF技术I/Q信号仿真及算法对比验证

Contrast Validating on Dual PRF Technology of CINRAD/SA Weather Radar with I/Q Signal Simulation and Algorithm

以CINRAD/SA天气雷达双PRF技术为研究对象,采用大气分层模型,建立基于端到端I/Q时域信号仿真算法,生成I/Q仿真信号并进行可靠性验证.对比分析不存在速度模糊、低重频下的速度模糊和双重频模糊情况下的快速傅里叶变换算法FFT和脉冲对算法PPP的评估精度,并分别采用标准解模糊算法和改进解模糊算法进行速度解模糊对比计算.统计分析结果表明:基于端到端I/Q信号仿真算法能对探测体内的风速细节进行很好的描述;当发生速度折叠时,脉冲对算法PPP的评估精度要高于快速傅里叶变换算法FFT的运算精度,同时改进解模糊算法精度高于标准解模糊算法,且与单PRF下的脉冲对算法PPP的评估精度相当.

To study the dual PRF technology of CINRAD/SA weather radar, an end to end I/Q signal simulation algorithm was developed using an atmosphere layered model. The I/Q signal was generated and its reliability was verified. The appraisal precision of the FFT algorithm and PPP algorithm under unfolded, folded in low PRF and folded in high PRF was compared. The velocity was unfolded with the original standard algorithm and the new algorithm. Statistical analysis results show that, the velocity details can be well described by the end to end simulation algorithm. When velocity folded, the accuracy of the PPP algorithm is better than the FFT algorithm. Meanwhile the accuracy of the new algorithm is better than the original standard algorithm, and is equivalent with the PPP algorithm.