“北斗”信号重构的导向矢量实时校正

针对导航应用中阵列天线导向矢量误差导致波束合成器性能恶化甚至失效的问题，提出了一种“北斗”信号重构的导向矢量实时校正算法。该算法利用重构的本地“北斗”参考信号与阵列天线接收信号进行相关解扩处理，然后利用信号子空间与信号正交补空间正交的特性，构造代价函数对各卫星方向的阵列导向矢量进行校正。仿真结果表明，经过校正的导向矢量相位误差从-100°~100°降低到-10°~10°范围内，幅度误差从-10~10 dB降低到-4~2 dB范围内；另外，导向矢量校正后，卫星信号波达方向估计误差在0.2°以内，估计精度大大提高。

Steering Vector Real-time Calibration Using Beidou Signals Reconstruction

Since the performance of the beamformer dramatically deteriorates and even becomes invalid due to errors of array steering vector,a steering vector real-time calibration algorithm using Beidou signals reconstruction is proposed.Firstly,the correlation of the reconstructed Beidou signals and received signals is processed.Then the cost function is defined by utilizing the orthogonality of the signal subspace and the signal orthogonal complement space.Finally,the signals steering vector is corrected.The simulation results show that the phase errors of corrected steering vector are reduced from -100°~100°to -10°~10°,and the amplitude errors are reduced from -10~10 dB to -4~2 dB.In addition,the error of direction-of-arrival estimation is within 0.2° by using the corrected steering vector and the estimation precision is greatly improved.