济南CINRAD/SA雷达双偏振升级关键技术分析

Key techniques for dual-polarization upgrade of CINRAD/SA weather radar in Jinan

针对CINRAD/SA天气雷达双偏振升级,阐述了通过WRSP信号处理器、晶振频率源、标定技术、相位编码技术、信号处理新技术新算法等关键技术的升级,提升了雷达的整体性能。济南雷达升级后,接收机灵敏度由-109 dBm提升至-113 dBm,接收机动态范围由89 dB提升至101 dB,发射机输出改善因子由59.34 dB提升至61.64 dB,系统相位噪声由0.107°提升至0.041°,系统实际地物对消最大值由45.1 dB提升至49.7 dB,距离分辨率由1000 m提升至250 m,改善了雷达对弱信号的探测能力,增强了对电磁干扰、超折射的识别能力,增强了地物抑制能力;天线伺服系统通过改碳刷结构汇流环为金属丝免维护汇流环,减少了天线动态故障报警率,提高了伺服系统运行的稳定性和可靠性;通过CW与TS信号在线标定技术,检验了升级后双偏振雷达双通道的一致性。

With a view to the dual-polarization upgrade of CINRAD/SA weather radar in Jinan,the upgrade of key techniques such as WRSP(Weather Radar Signal Processor),frequency source of crystal oscillator,calibration technique,phase encoding technique,and new algorithm of signal processing technique is elaborated,and the performance of radar has improved.After upgrade,the sensitivity of receiver improves from-109 dBm to-113 dBm,the dynamic range of receiver from 89 dB to 101 dB,the output improvement factor of transmitter from 59.34 dB to 61.64 dB,the phase noise from 0.107°to 0.041°,the maximum value of actual ground clutter from 45.1 dB to 49.7 dB,and the range resolution from 1000 m to 250 m.The upgrade of radar system improves the detection of weak signals,strengthens the recognition of electromagnetic interference and superrefraction,and enhances the resistance of ground clutter.Through altering antenna servo system from carbon brush slip ring to metal wire maintenance-free slip ring,the alarm rate of antenna s dynamic fault has reduced and the stability and reliability of servo system have increased.The consistency of the two channels of the upgraded dual-polarization radar is testified through the online calibration technique of CW and TS signals.