时频变换下的天气雷达异常回波信号增强系统设计

Design of weather radar abnormal echo signal enhancement system based on time-frequency transform

为了解决干扰回波识别算法和零滞后相关系数应用方法无法精准跟踪信号,及伪信号干扰信号识别精准度的问题,提出了时频变换下的天气雷达异常回波信号增强系统设计。使用PXIe-8135 RT嵌入式控制器,控制PXI机箱与各个模块之间安全通信。设计PXIe-5645R异常回波信号收发仪,在消除正信号和负信号出现噪声的前提下,收发异常回波信号。设计增强电路,保证系统安全运行,计算C波段雷达多普勒探测频率,对信号进行增益处理,达到对伪信号衰减的目的。设计完整跟踪环,完成载波剥离。由实验结果可知,该系统捕获和跟踪结果与实际结果一致,说明该系统能够高效收发异常回波信号。

In order to solve the problem that the jamming echo recognition algorithm and the application method of zero lag correlation coefficient can not accurately track the signal and the recognition accuracy of pseudo signal jamming signal,the design of weather radar abnormal echo signal enhancement system under time-frequency transformation is proposed. PXIe-8135 RT embedded controller is used to control the safe communication between PXI chassis and each module. PXIe-5645R abnormal echo signal transceiver is designed to transmit and receive abnormal echo signal on the premise of eliminating the noise of positive signal and negative signal. The enhancement circuit is designed to ensure the safe operation of the system,calculate the Doppler detection frequency of C-band radar,and process the signal gain to attenuate the pseudo signal. A complete tracking loop is designed to complete carrier stripping. The experimental results show that the acquisition and tracking results of the system are consistent with the actual results,which shows that the system can send and receive abnormal echo signals efficiently.