相位差变化率的快速高精度测量及精度分析

由于阵元间相位差变化率这一观测量与通道不一致性关系不大,信号到达两阵元间的相位差变化率常用于无源定位测量中。提出了一种新的快速高精度的相位差变化率测量方法,利用分时间片思想,首先通过对无模糊相位差进行一次相位平移,得到各个时间片含模糊的相位差值;然后对得到的各个时间片的含模糊相位差进行一次相位平移,得到各时间片间相对无模糊的相位差;最后对相对无模糊相位差采用最小二乘算法求得相位差变化率。理论分析和仿真实验表明,本算法可以很好地解决测量中由于相位模糊造成的相位差抖动问题,能够在短时间内得到高精度相位差变化率信息,可以满足定位要求。

A Fast and Accurate Estimator and Precision Analysis for Phase Difference Rate from Two-element Antenna Array

Passive location with the information of the phase difference rate of change has many advantages,such as high precision,quick location and so on. While the phase difference rate of change is very difficult to estimate since it is very subtle and the noise and the inconsistency of channels have an effect on measuring the phase difference. A fast and accurate estimator for phase difference rate of change is put forward with the thoughts of time slices. Firstly, remove the unambiguous phase difference to get the ambiguous phase difference of every time slice. Then,the ambiguous phase difference is removed to get the relatively unambiguous phase difference. Finally,the phase difference rate of change is estimated by the least square. The theoretical analysis and simulation results show that this method can solve the problem of of the phase jitter because of ambiguous phase and the phase difference of change can be acquired accurately in short time. And the requires of passive location can be met .