舰船 RCS 测试内外结合定标方法

针对舰船 RCS 测试的定标问题，讨论从接收机前端注入标准微波信号或从发射机耦合发射功率输入接收机前端的2种内定标方法，作为修正外场定标的依据。根据雷达方程分析外场定标 RCS 测量设备、标准体加工、目标跟踪定位、测试区域环境等主要误差因素。讨论发射功率、系统非线性、系统稳定性、极化损耗等引入的误差，提出外场定标对标准体几何尺寸、表面光洁度以及所需信噪比等要求。通过内定标与外定标相结合的方法，解决由于定标与测试间隔时间过长接收机状态出现漂移导致测试误差的问题，保障舰船 RCS 长时间测试的精度和稳定度。

Methods of internal and extermal calibration for ship RCS testing

This paper is aimed at the problem of ship RCS test calibration, discussed from the front end of the receiver injection standard microwave signal or form a transmitter coupled emission power input receiver two calibration principle and method, as a basis for the correction of external field calibration. According to the radar equation, the main error factors are analyzed, such as external calibration RCS test equipmentstandard body processingtarget tracking and positioningtest area environment and so on. The error of transmission powersystem nonlinearitysystem stabilitypolarization loss and so on are discussed. The standard sizesurface finishand the required signal to noise ratio of the external field calibration are pro-posed. Through the method of internal calibration and external calibration combination, solve the problem of test error caused by the deviation of the state of the receiver in the time of calibration and test, the accuracy and migration of the RCS long time test are guaranteed.