基于参数估计的动平台雷达等效轴系参数准实时标定方法

Study on Equivalent Axis Parameter Calibration for Radar System on Moving Platform Based on Parameter Estimation

针对基于动平台的外测设备状态易发生变化与在轨卫星跟踪时对测量精度要求高的矛盾,在标定光电偏差与重力下垂参数的基础上,通过对跟踪在轨星的外测数据处理,利用基于嵌入协作策略的参数估计方法实现了船载外测设备等效轴系参数的标定。实际应用检验表明,该方法可实现经外测设备参数的快速标定,经校飞评估使用新标定的等效轴系参数后船载外测设备测角数据精度均优于40″。经分析验证,该方法不受初始轴系参数、惯导零值标定误差、光电偏差标定误差和定向灵敏度误差等外界因素的影响,可推广至各类动态平台雷达的参数标定。

In the satellite tracking process, the moving platform has a great impact on the precision of the devices. Using the parameter estimation method based on embedding collaboration, the calibration of the equivalent axis parameter for the ship-borne devices is achieved with the previous calibration results of the optical-electrical axis non-parallelism and the weight distortion error.A flying test is implemented to evaluate this calibration method. The result shows the angle measurement precision is better than 40＂. In addition, this method is robust to the external factors such as the previous calibration error of the initial axis parameter, the zero value of the inertial navigation system, the optical-electrical axis non-parallelism as well as the directional sensitivity error.Moreover,this method can be used for radar parameter calibration on other moving platforms.