一种面向全空域覆盖阵列的和差比幅测角跟踪方法

A Sum-Difference Amplitude-comparison Angle Estimation and Tracking Method for Phased Array with Hemispherical Coverage

针对和差比幅方法在全空域相控阵系统应用扩展中出现的辅助波束指向计算、角度估计问题,分别给出了一种基于辅助坐标系的指向计算方法和一种基于方向图高斯拟合的目标角度解算方法,并针对角度跟踪滤波环节的角误差向量估计方法进行了优化。仿真分析结果表明,面向子阵化全空域阵列,和差比幅方法表现出了优越的差波束性能,且在和差比相方法跟踪失效的条件下,该方法仍然能够实现优于0.1倍波束宽度的角跟踪精度。

The amplitude-comparison monopulse(ACM)method is studied for hemispherical coverage phased arrays(HCPA).In order to solve the problems of auxiliary beam pointing calculation and angle estimation in application expansion,a pointing calculation method based on auxiliary coordinate system and a target angle calculation method based on Gaussian fitting of beam pattern are given respectively.Meanwhile,the angle error vector estimation method for angle filtering and tracking is optimized.The simulation results show that the ACM method for subarray based HCPA presents superior difference beam performance,and the ACM method can still achieve angular tracking accuracy better than 0.1 times the beam width while the phase comparison method is fail to track.