CAJ | 학술논문

干扰和多径是影响接收机导航定位性能的两个主要因素。针对卫星导航接收机的抗干扰问题，提出了一种基于两级滤波结构的卫星导航天线阵抗干扰算法。第一级滤波采用功率倒置算法抑制干扰，通过相关解扩提高卫星信号的信噪比，并估计出其空间特征矢量。第二级滤波用估计得到的卫星信号空间特征矢量对第一级滤波输出信号进行加权处理，从而形成指向卫星信号方向的主波束来进一步提高信噪比。仿真结果表明，该算法的性能明显优于功率倒置算法，且非常接近传统的波束形成算法，不需要阵列校正以及姿态测量单元辅助，其实现代价远小于传统的波束形成算法。
간우화다경시영향접수궤도항정위성능적량개주요인소。침대위성도항접수궤적항간우문제，제출료일충기우량급려파결구적위성도항천선진항간우산법。제일급려파채용공솔도치산법억제간우，통과상관해확제고위성신호적신조비，병고계출기공간특정시량。제이급려파용고계득도적위성신호공간특정시량대제일급려파수출신호진행가권처리，종이형성지향위성신호방향적주파속래진일보제고신조비。방진결과표명，해산법적성능명현우우공솔도치산법，차비상접근전통적파속형성산법，불수요진렬교정이급자태측량단원보조，기실현대개원소우전통적파속형성산법。
Interference and multipath were the two dominant factors that affect the guidance and positioning performance of GNSS (Global Navigation Satellite System).According to the problem of anti-interference,a two-stage anti-jamming algorithm was proposed for GNSS antenna array.In the first stage,the PI (power inversion)algorithm was applied to suppress the interference.Then,the SNR (Signal-to-Noise-Ratio)of GNSS signal was improved by dispreading processing,and the spatial signature vector was estimated.In the second stage,the estimated spatial signature vector was used to weight and sum the output signal of the first stage.The proposed algorithm could null the interference and steer beams in the direction of GNSS signals simultaneously.Simulation results show that the performance of the proposed algorithm is better than PI algorithm, and it is similar to MVDR (Minimum Variance Distortionless Response)algorithm.The proposed algorithm requires no array calibration and aided altitude measurement unit,which has less implementation cost than MVDR algorithm.