测绘学报

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函数极值法求解三频GNSS最优载波相位组合观测量

李金龙1,杨元喜2,何海波3,徐君毅4,郭海荣1   

  1. 1. 信息工程大学测绘学院
    2. 北京海淀区北三环中路69号导航办
    3. 北京环球信息应用开发中心;61081部队
    4. 解放军信息工程大学测绘学院
  • 收稿日期:2011-10-19 修回日期:2012-02-27 出版日期:2012-12-25 发布日期:2013-04-17
  • 通讯作者: 李金龙

Optimal Carrier-phase Combinations for Triple-frequency GNSS Derived From an Analytical Method

  • Received:2011-10-19 Revised:2012-02-27 Online:2012-12-25 Published:2013-04-17

摘要:

GNSS三频载波相位组合观测量可以提高模糊度解算成功率和周跳探测与修复的可靠性。本文将载波相位组合观测量的噪声放大系数表示为与组合观测量波长和电离层延迟影响系数相关参数的函数,提出基于函数极值法求解特定波长和电离层延迟影响系数下的噪声最优线性组合系数。理论推导和计算结果表明,波长较长且以周为单位噪声放大系数较小的三频载波相位组合观测量,其以周为单位的电离层延迟放大系数随组合系数之和的增大而增大,约为线性组合系数之和的2.3倍;而电离层延迟影响较小且以周为单位噪声放大系数较小的三频载波相位组合观测量,其波长随线性组合系数之和的增大而减小。

关键词: 全球卫星导航系统, COMPASS, 三频, 函数极值法, 最优组合

Abstract:

Triple-frequency carrier-phase combinations can improve the success rate of ambiguity resolution and the reliability of cycle-slips detection and repair. In this paper, noise amplification factor of combinations is expressed as the function of two parameters which are related to the wavelength and ionospheric scale factor of combinations respectively, and then an analytical method for solving optimal linear coefficients with minimal noise amplification factor is presented, when the wavelength and ionospheric scale factor of combinations are given. It is shown that the ionospheric amplification factor of combinations with long wavelength and low noise increased when the sum of the linear coefficients increased, and the ionospheric amplification factor is about 2.3 times of the sum. Furthermore, the wavelength of combinations with small ionospheric amplification factor and low noise decreased when the sum of linear coefficients increased.

Key words: GNSS, COMPASS, triple-frequency, analytical method, optimal combination