基于IMM-UKF的航天测控雷达机动目标跟踪

摘要

The great tracking error of radar to maneuvering target exists in aerospace measurement & control if the exterior trajectory of a launcher is calculated directly according to the measured value of radar because of the high random error. An IMM-UKF based maneuvering target tracking method of radar which satisfies the motion characteristic of the carrier rocket better is presented. The simulation result shows that the IMM-UKF algorithm has higher accuracy of exterior ballistic tracking than that of the methods such as direct calculation method of target trajectory and UKF filtering method based on single motion model. In ad-dition,the convergence velocity of IMM-UKF algorithm can meet the real-time requirement of exterior ballistic tracking in aero-space measurement & control.%航天测控中雷达的测量值具有较大的随机误差，用雷达的测量值直接解算运载火箭的外弹道跟踪精度较低。提出基于IMM-UKF的雷达机动目标跟踪方法，适应了航天发射任务中运载火箭在不同时段具有不同机动特性条件下对机动目标稳定精确跟踪的需要。仿真结果表明和利用雷达测量值直接解算目标弹道的方法以及采用单一运动模型的UKF滤波方法相比，IMM-UKF算法具有更高的外弹道跟踪精度，并且算法的收敛速度满足航天测控外弹道跟踪的实时性要求。