摘要
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。
In order to solve the problem of the anomaly signal of navigation satellite system, the digital distortion of Beidou navigation signal is researched and analyzed. Firstly, the mathematical model of the digital distortion for the ranging code of BDS is established. Then, the cross - correlation function and power spectrum function of ange bias, correlation loss Beidou navigation signal. digital distortion are deduced, simulated and analyzed. Finally, the pseudor- and S curve bias as the criteria which estimate the impact of digital distortion on The results demonstrate that the digital distortion of Beidou navigation signal can bring about pseudorange measurement error, reduces ranging precision and positioning precision of nav- igation system and leads to the integrity degradation for augmentation system.
出处
《航天控制》
CSCD
北大核心
2016年第2期38-43,共6页
Aerospace Control
基金
民航安全能力建设项目"北斗机载设备技术标准规定与应用研究"(AADSA0007)
中央高校基本科研业务费中国民航大学专项"基于北斗的通用航空指挥监控系统"(20001006)
中电科54所新技术研究高校合作项目"通航机载GNSS终端完好性技术研究"(KX14260033)
关键词
数字畸变
相关峰
功率谱
相关损耗
S曲线锁定点偏差
Digital distortion
Correlation peak
Power spectrum
Correlation loss
S curve locking point bias
