Compass系统TGD与IFB分离解算方法.pdfVIP

CSNC2010 第一届中国卫星导航学术年会 北京 Compass 系统TGD 与IFB 分离解算方法 吴晓莉 1,2 刘利 1 平劲松 2 董恩强 1 (1 北京环球信息应用开发中心 北京 100094； 2 中国科学院上海天文台 上海 200030) 摘 要：分析推导了 Compass 系统中硬件延迟频间偏差参数的定义，利用模拟的双频观测数据，对卫星的硬件延迟频 间偏差参数 TGD 与接收机的硬件延迟频间偏差参数 IFB 的分离解算进行了分析，分别采用标定接收机IFB 初值与观 测卫星 TGD 和为零的约束条件进行求解。试验结果表明，不考虑电离层模型误差，标定接收机的约束条件，TGD1 解算均方差为 1.371ns，TGD2 解算均方差为 0.608ns ；观测卫星TGD 和为零的约束条件，TGD1 解算均方差为 1.821ns， TGD2 解算均方差为 0.827ns 。 关键词：硬件延迟；频间偏差参数；TGD ；IFB Separation methods of TGD and IFB for Compass System 1,2 1 2 1 Wu xiao-li Liu li Ping Jing-song Dong En-qiang (1 Beijing Global information center of application and exploration, Beijing 100094, China 2. ShangHai Astronomical Observatory, Chinese Academy of Sciences, ShangHai 20030,China ) Abstract: The definition of hardware-induced timing bias inter-frequency parameters for Compass system is deduced in this paper. Using simulated dual-frequency observation data, the separate TGD parameter of satellite a d IFB parameter of receiver are calculated, under the restriction of special receiver’s IFB calibration value and the restriction that the sum of observational satellite TGD is equal to zero. Without ionosphere model error, the experiment results indicate that with the restriction of calibration receiver value, the RMS of TGD1 is 1.371ns and the RMS of TGD2 is 0.608 ns. While with the restriction that the sum of observational satellite TGD is equal to zero, the RMS of TGD1 is 1.821ns and the RMS of TGD2 is 0.827ns. Key words: hardware-induced timing bias, inter-frequency parameter, TGD, IFB 1 引言 为消除电离层延迟的影响，导航卫星通常播发多个频点的导航信号，如早期的 GPS 卫星播发 L1,L2 频点信号，BLOC