脉间变频测量雷达正交误差的实时修正方法

针对脉间变频RCS测量雷达采用模拟正交解调方法获得同相分量和正交分量所引入的解调误差,提出了一种实时校准方法。该方法通过引入校准支路,将从测试信号耦合出的校准信号经固定延时和衰减后与回波信号在同一个脉冲周期内依先后顺序采集,由于校准支路信号只与系统内部状态有关而与测试目标和场地无关且间隔很短,可使用校准支路所得到的误差校准测试通道的信号。通过校准支路的应用可在系统整个工作时间内随时对解调误差进行修正。给出了校准支路的分析及设计,对使用模拟器测试的结果讨论了修正算法。

A Real Time Quadrature Demodulation Error Correction Method in Pulse to Pulse Frequency Shifting RCS Measurement Radar

A real time method for the calibration of the quadrature demodulation error of the RCS measurement radar receiver is proposed.Via the calibration branch,the calibration signal coupled from the testing signal is delayed and attenuated,then the calibration signal and the testing signal will be sampled in the same pulse period successively.Since the calibration signal is independent of the target and the test site,the error coefficient calculated from the calibration signal can be used to correct the test result during the entire test process.The analysis and design are presented and the correction method is discussed.