Analysis of the influence of time-domain anti-interference on correlation peaks under channel characteristics
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摘要: 天线、射频前端等模拟器件的非理想通道特性会导致全球卫星导航系统(GNSS)接收机内产生测距偏差，现阶段由传统的抗干扰算法导致的测距偏差已成为高精度测距接收机实现其精度提升的主要障碍. 通过理论推导证明在通道特性理想时，由于抗干扰滤波器系数在迭代下的时变特性以及干扰自相关值的不确定性，仍然会导致相关函数的非对称性；在实际通道特性下，基于单天线的传统时域抗干扰算法会导致原本不对称的相关峰畸变程度进一步恶化，并证明了在实际通道特性下，原本不对称的相关峰畸变程度恶化，是由于传统的抗干扰算法在迭代的过程中产生的不同时刻相关函数的叠加效应导致的.Abstract: Due to the non-ideal characteristics of analog components such as antennas and RF front-ends, ranging errors will occur in the Global Navigation Satellite System (GNSS) receiver. At present, the deviation of the ranging value caused by the traditional anti-jamming algorithm has become the main obstacle to the improvement of the accuracy of high-precision ranging receiver. In this paper, theoretical derivation proves that when the channel characteristics are ideal, the correlation function will still be asymmetric due to the time-varying characteristics of the anti-jamming filter coefficients under iteration and the uncertainty of the interference auto correlation value. When the channel characteristics are not ideal, the traditional time-domain anti-jamming algorithm based on a single antenna will further deteriorate the originally asymmetrical correlation peak distortion. It is proved that under the non-ideal channel characteristics, the asymmetric correlation peak distortion caused by the time-domain anti-interference filter is further deteriorated due to the superposition effect of the correlation functions of each delay.
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