论文部分内容阅读
针对卫星导航信号异常问题,对北斗导航信号数字畸变进行了研究分析。首先建立了北斗信号数字畸变的数学模型;其次推导并仿真分析了北斗导航信号发生数字畸变的相关函数及功率谱密度函数;最后,用伪距偏差、相关损耗和S曲线偏差3个指标,对北斗导航信号发生数字畸变产生的影响进行评估。结果表明:北斗导航信号发生数字畸变会产生伪距测量误差,降低导航系统的测距精度和定位精度,进而降低增强系统的完好性。
Aiming at the anomaly of satellite navigation signal, the digital distortion of navigation signal of BeiDou is studied and analyzed. Firstly, the mathematical model of Beidou signal digital distortion was established. Secondly, the correlation function and power spectral density function of digital distortion of Beidou navigation signal were deduced and simulated. Finally, three indexes of pseudorange error, correlation loss and S-curve deviation were calculated. Beidou navigation signal digital distortion occurred to assess the impact. The results show that the digital distortion of Beidou navigation signal will lead to the measurement error of pseudorange, reduce the ranging accuracy and positioning accuracy of the navigation system, and then reduce the integrity of the augmented system.