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北斗长河组合导航伪时差测量与ASF修正
引用本文:陈洪卿,王宏远,吕彩田,张峰云,李孝辉,袁海波.北斗长河组合导航伪时差测量与ASF修正[J].宇航计测技术,2004,24(3):3-5.
作者姓名:陈洪卿  王宏远  吕彩田  张峰云  李孝辉  袁海波
作者单位:1. 中国科学院国家授时中心,西安,710600
2. 海军92678部队,天津,300042
基金项目:国家自然科学基金资助项目,编号49974018 60374068。
摘    要:通过时间比对手段把长河二号和北斗一号两个导航系统的原子钟组成一个参考时间尺度,测量导航信号由天线发出时刻相对于同一参考时间尺度的时差改正数,通过卫星微波或地面长波信号把改正数发送给用户接收机,经解调解码,就可以进行北斗长河组合导航的伪时差测量,从而解算接收机的位置和钟差。用模式计算和实测相结合的方法解决长河信号的传播的ASF改正问题,是提高组合导航定位准确度的有效手段。

关 键 词:组合导航  伪卫星  时差改正数  附加二次相位因子(ASF)
文章编号:1000-7202(2004)03-0003-03
修稿时间:2003年10月20

Discussion of the ASF Correction in Measuring Pseudo-time Difference for Developing the Integrated Navigation System of the Beidou 1 and Changhe 2
CHEN Hong-qing MANG Hong-yuan LU Cai-tian ZHANG Fen - yun LI Xiao-hui YUAN Hai-bo.Discussion of the ASF Correction in Measuring Pseudo-time Difference for Developing the Integrated Navigation System of the Beidou 1 and Changhe 2[J].Journal of Astronautic Metrology and Measurement,2004,24(3):3-5.
Authors:CHEN Hong-qing MANG Hong-yuan LU Cai-tian ZHANG Fen - yun LI Xiao-hui YUAN Hai-bo
Abstract:A time reference used for navigation will be composed of the atmic clocks between two navigation systems of the Beidou 1 and Changhe 2 by time measuring and time comparing of the clocks. The correction of time difference between the same time reference and the time of navigation signals transmitted from antennas will be measured and transmitted to user receiver by Beidou 1 signal or Changhe 2 signal. It will be carried out by demodulating and decoding that measuing the pseudo - time difference of the navigation signals both Beidou 1 and Changhe 2 and getting the position of a receiver and the clock difference relative to the same time reference. The additional second - phase factor(ASF) of ground wave of LF radio signal has influence mainly on the error of the pseudo - time difference measurement and correction for Changhe 2 navigation system. It is useful and efficient for improving the positioning accuacy for the integrated navigation system of the Beidou 1 and Changhe 2, to make the ASF correction by use of combining the way of modular ASF calculation with the way of actual ASF measurement.
Keywords:Integrated navigation Pseudo satellite Correction of time difference Additional second - phase factor(ASF)
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