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由于天线阵元位置、射频(RF)放大器和模数转换器(ADC)等因素的影响,全球卫星导航系统(GNSS)抗干扰天线阵各通道间不可避免地存在着不一致性。首先,利用矩阵中的子空间理论分析了通道的幅度不一致性和相位不一致性对多重信号分类(MUSIC)算法的影响。理论分析结果表明:单干扰情况下通道幅度不一致性会降低MUSIC算法方向图的零陷深度,但不影响零陷位置,相位不一致性对MUSIC算法方向图零陷位置和零陷深度均有影响;多干扰情况下通道幅度不一致性和相位不一致性对MUSIC算法方向图零陷位置零陷和深度都有影响。因此在通道不一致性慢变化的条件下,MUSIC算法利用方向图进行性能评估时需要测出通道幅相偏差矩阵进行方向图纠正。然后,利用仿真的方法对不一致性的影响进行了实验分析,实验分析结果与理论分析结果一致。
Due to the influence of antenna element location, radio frequency (RF) amplifier and analog-to-digital converter (ADC), inevitably, there are inconsistencies among the channels of GNSS anti-interference antenna array. First, the influence of amplitude inconsistency and phase inconsistency on the MUSIC algorithm is analyzed using the subspace theory in the matrix. The results of theoretical analysis show that the channel amplitude inconsistency under single interference will reduce the nulling depth of the MUSIC algorithm, but it will not affect the nulling position and the phase inconsistency will affect the nulling position and the nudging depth of the MUSIC algorithm. The channel amplitude inconsistencies and phase inconsistencies in multi-jamming cases have an impact on the nulls and depths of the nulls in the MUSIC algorithm. Therefore, under the condition of slowly changing channel inconsistency, the MUSIC algorithm needs to measure the amplitude and phase deviation matrix of the channel to correct the pattern when using the pattern to evaluate performance. Then, the influence of the inconsistency is simulated by the method of simulation. The experimental analysis is consistent with the theoretical analysis.