A technique of on-line calibration based on SYSCAL for CINRAD weather radar adopts is introduced,which can dynamically test and adjust the measurement errors for the performance variation of transmitting and receiving channels in a running radar,and the calibration has a good performance and an appropriate time interval.A detailed analysis is presented by the theoretical deduction of the on-line calibration technique of CINRAD weather radar reflectivity factor.The realization methods of the technique and corresponding calibration methods and its derivation in CINRAD/SA weather radar are described.The actual effect is tested and analyzed with a calibration example of the Wuhan weather radar.Some problems of the on-line calibration are listed.To master the principles and the technique of the online calibration is useful for correctly implementing calibration,ensuring the echo quality and improving the ability to diagnose the radar faults.%CINRAD天气雷达采用了一种基于SYSCAL的反射率因子在线标定技术,能够在雷达运行中动态检测和校正发射和接收通道的性能变化导致的反射率因子测量偏差,且标定具有良好的性能和时效.通过理论推演详细解析了CINRAD天气雷达反射率因子在线标定的原理,介绍了其在CINRAD/SA天气雷达中的技术实现方式和相应的标定方法及由来.以武汉CINRAD/SA天气雷达的一次在线标定为例对标定实效进行检验和分析,指出了CINRAD天气雷达反射率因子在线标定技术中存在的一些问题.掌握天气雷达反射率因子在线标定原理和技术,对于正确实施标定,保证回波质量和提高雷达故障诊断分析能力,十分必要.
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