用信号子空间法校准天线阵各通道增益和相位的不一致性

Calibration of Sensor Gain and Phase Uncertainties Using Signal Subspace Methods

基于阵列协方差矩阵特征分解的测向技术,在天线阵各通道特性不一致时,其性能会急剧下降。本文提出了一种校准非线性阵列各通道增益和相位不一致性的新方法,即利用两个未知精确方向校准信号源的信号,分别作特征分解处理,然后通过用迭代算法求解非线性方程组以估计各通道的增益和相位因子。模拟结果表明,本文的方法是成功的。

For the eigen-based direction finding technique, array sensor gain and phase uncertainties degrade severely its performance. This paper presents a new technique of calibrating the sensor gain and phase uncertainties of nonlinear array. At first we extract signal subspace ultilizing two radiating sources (time-disjoint) whose directions are not known accurately, then develop new iterative algorithms to solve nonlinear equations for estimation of sensor gain and phase factors. Simulation results demonstrate the pro-posd new technique's performance.