【作者】 许憧； 孙超； 赵洪博； 冯文全； 雷长彪；

【Author】 Xu Chong;Sun Chao;Zhao Hongbo;Feng Wenquan;Lei Changbiao;School of Electronics and Information Engineering, Beihang University;Hefei Innovation Research Institute of Beihang University;North Electronic Equipment Research Institute;

【机构】 北京航空航天大学电子信息工程学院； 北京航空航天大学合肥创新研究院； 北方电子设备研究所；

【摘要】 全球卫星导航系统(Global Navigation Satellite System, GNSS)接收机可同时输出伪距测量值和载波相位测量值,通过Hatch滤波器得到载波平滑码伪距值,可有效抑制测量噪声,提高定位的精度和可靠性。然而电离层风暴和电离层闪烁会造成较大的载波相位和码相位测量误差,导致码和载波不一致(Code-CarrierDivergence,CCD)。本文针对码和载波相位不一致的机理进行详细分析,建立电离层风暴和电离层闪烁模型,推导出上述异常对载波平滑码伪距(Carrier-Smoothed-Code, CSC)测量值误差的影响。结果表明电离层风暴使得平滑后的伪距测量值会与码伪距测量值产生一个固定差值,电离层闪烁同样会影响平滑后的伪距测量值误差。更多还原

【Abstract】 Global Navigation Satellite System(GNSS) receiver can simultaneously output pseudo-range measurement values and carrier phase measurement values, and obtain the carrier smoothing code pseudo-range measurement values through Hatch filter, which can effectively suppress measurement noise and improve positioning accuracy and reliability. However, ionospheric storms and ionospheric scintillation can cause large carrier and code phase measurement errors, resulting in Code-Carrier Divergence(CCD). In this paper, the generation of Code-Carrier Divergence is analyzed in detail, the mathematical model of ionospheric storm and ionospheric scintillation is established, and the error of Carrier-Smoothed-Code(CSC) caused by the abnormal fault above is deduced. The result shows that ionospheric storm will cause a fixed difference between smoothed pseudo-range measurement and code pseudo-range measurement. Ionospheric scintillation will affect the error of carrier-smoothed-code pseudo-range measurement.更多还原