关键词: 模拟畸变, 相关峰, 功率谱, 相关损耗, S曲线锁定点偏差

Abstract: The failure for signal generated payload of satellite navigation will cause signal distortion. When signal of satellite navigation is distortional, the performance of navigation will be influenced. Therefore, the threat model for analog distortional signal of Beidou is researched and analyzed. The mathematical model for threat model B of Beidou is established and is analyzed theoretically. The formulas of cross-correlation function, power spectrum density and correlation loss are derived, and they are simulated and analyzed. In accordance with the mathematical model for Scurve and Scurve locking point bias of threat model B, S-curve and S-curve locking point bias are simulated and the impact on measurement performance is analyzed. The results demonstrate that the anomaly signal for Beidou will cause pseudorange measurement error. Furthermore, with the greater degree of distortion, the accuracies of Beidou including ranging accuracy and positioning accuracy are reduced, so does the integrity for augmentation system.

Key words: Threat model B, Correlation peak, Power spectrum, Correlation loss, S-curve locking point bias