分布式阵列雷达基线位置和相位误差的卫星标校方法

在采用相位干涉测角的分布式阵列雷达系统中，系统阵面相位中心位置误差和相位误差对测角精度影响很大，且阵面相位中心位置与物理中心位置通常不一致，因此需要对其进行精细标准补偿。传统的雷达系统误差校正方法通常采用远场辐射源来对雷达进行校正，但是对于单元间距很大的分布式阵列空间目标监视雷达而言，要实现远场辐射校准往往很难。该文提出一种利用多弧段的精轨卫星精密星历对阵面相位中心位置误差引起的相位误差进行白化，然后搜索相位中心坐标和相位差使匹配方差最小的校正方法，无需使用特定仪器测量，且能很好地标定误差；计算机仿真以及实测数据验证了使用该文校正方法后，测角精度得到了显著提升。

A Satellite Calibration Method for the Baseline Coordinate and Phase Difference of Distributed Radar Array

In the system of distributed radar array system using phase interference angle measurement, the phase center coordinate error of arrays and the phase difference error have relatively large influence on the angle measurement. The phase center position is often inconsistent with physical center position. Thus it is necessary to compensate these errors precisely. Far field radiation sources are often used to calibrate radar in traditional calibration methods. However, it is usually hard to achieve far field radiation sources for distributed radar array with large space between units surveilling space targets. In this paper, a calibration method based on the precise ephemeris of refined orbit satellites without measuring with special instruments is proposed. The phase error caused by coordinate error can be whitened by the precise ephemeris of multiple arcs, and the coordinate and phase difference will be searched out by matching the minimum variance. This method can get the errors easily. The simulation results and actual data verify that angle measurement accuracy gets large improvement by the method.