On-the-fly ambiguity resolution by restricting coordinates predicted by Doppler
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摘要: 利用GPS(Global Positioning System)相位观测进行动态定位的主要困难就是法方程不适定问题(秩亏或病态问题),导致模糊度浮动解及其协方差阵不准,以此构造的模糊度搜索范围比较大,使得模糊度的搜索非常困难.提出利用Doppler高精度测速预报近似坐标并对其附加约束,解决法方程求逆中的不适定问题,提高模糊度浮动解及其方差阵的准确性,缩小模糊度的搜索范围,提高模糊度搜索的成功率.结果表明,短基线情况,新方法在模糊度动态解算中取得了明显效果.Abstract: The main difficulty of kinematic positioning using carrier phase observations is the ill-posed problem of normal matrix. The float ambiguity and its covariance matrix are inaccurate, so impact the success rate of ambiguity resolution. A new method was put forward for resolving the ill-posed problem in kinematic positioning by restricting the coordinates predicted by Doppler observations. The float ambiguity and its covariance matrix were improved because the coordinates predicted by Doppler were more accurate than that determined by pseudo-range observations, so the success rate of ambiguity searching was advanced. The results indicate that the effect of the new method for on-the-fly ambiguity resolution of the short baseline is clear.
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Key words:
- Doppler /
- ill-posed /
- On-the-fly ambiguity /
- coordinates restriction
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