理论分析窄带干扰抑制对伪距测量偏差的影响

Analysis of Pseudorange Bias due to Suppression of Narrow Bandwidth Interference

卫星导航定位所处频段复杂,接收机容易受干扰,特别是窄带干扰的影响。接收机通常会采用干扰抑制算法消除窄带干扰的影响,但是在干扰被抑制后,可能会引起测距零值发生变化。针对不同窄带干扰情况,通过改进模型理论分析了存在典型群时延失真情况下,干扰抑制引起的鉴相曲线过零点偏移,得到了群时延失真与不同位置窄带干扰抑制对鉴相曲线过零点偏移的影响,为接收机设计、接收通道群时延设计提供了参考和支撑。

The navigation receiver is vulnerable to the interference due to the complex of the navigation frequency band,especially for the narrow bandwidth interference.Thus,interference suppression algorithm is usually used.However,this may bring the diverse of zero value in receiver for different cases of interference.Focusing on this issue,the S-curve bias is analyzed due to the different location of interference suppression in the presence of several typical cases of group delay distortions in RF channel by extending the previous model.Some conclusions about the relation between the types of interference and distortions of group delay are obtained and can provide some guides for optimizing the RF channel for receiver.