分布式相参雷达基线选择与标定误差分析

分布式孔径相参合成雷达一个显著的特点是能够对目标进行收发全相参合成探测,实现能量的最大化利用。要实现对目标的相参探测,单元雷达布站需遵循一定的基线选择准则,分别从回波相关、信号相参、目标分辨和阵面遮挡4个方面给出了雷达基线的选择准则;在此基础上,通过理伦分析和仿真验证得出基线标定误差不会对联合阵列波束指向产生影响,即基线标定误差不会引入角度指向误差;最后分析了阵面指向误差对联合阵列天线方向图和联合天线增益的影响,由于引入了相位差,使得联合阵列天线方向图副瓣电平随着阵面指向误差的增大而逐渐抬升,同时,造成联合天线增益出现损失。

Distributed coherent radar baseline selection and calibration error analysis

A significant advantage of the distributed aperture coherence synthesizing radar is transmit receive full coherence synthetic detection of the target, realizing the maximum utilization of energy. In order to achieve coherence synthetic detection, the unit radar must follow certain baseline selection criteria. This article gives radar baseline selection criteria respectively from four aspects, including echo correlation, signal coherence, target resolution and antenna array block. On this basis, it is concluded that the baseline calibration error will not affect the joint array beam direction, or the angle pointing error, through theoretical analysis and simulation verification. Finally, this article analyzes the influence of the array pointing error on the joint array antenna pattern and joint antenna gain. As the phase difference is introduced, the joint array antenna sidelobe is gradually raised with the increase of the array pointing error and the joint antenna gain is lost.