中长基线GPS网络RTK模糊度快速解算的一种新方法

提出采用选权拟合的正则化方法。利用参考站坐标准确已知的条件作为约束,设计出正则化矩阵,使法矩阵的病态性得到了较大的改善,只用几个历元的数据求解,能较准确得到模糊度的浮点解。在此基础上,结合LAMBDA方法可以快速地确定整周模糊度。以4条中长基线的实测数据为例,本文方法用5个历元的单频L1数据就能求解出整周模糊度。与现有方法相比,新方法可采用单频GPS数据实现中长基线GPS网络RTK的整数模糊度快速解算,而且可靠性好,有良好的应用前景。

A New Approach for Fast Integer Ambiguity Resolution Suitable for Medium-long Baseline in GPS Network RTK

A new method is proposed based on the Tikhonov regularization principle and se-lected weight fitting thought and precisely known reference station coordinates,to work out the regularized matrix,which can mitigate the ill-condition of the normal matrix.The rela-tive float ambiguity can be computed only using several epochs ' data.Combined with the LAMBDA method,the new approach can fix the integer ambiguity correctly and quickly.Taking an example,using measured data sets coming from the four medium-long baselines,the new method can obtain the exact ambiguities only usingL1-frequency data of five epochs.Compared with the existing methods,the new method can solve the ambiguities of medium-long baseline GPS network RTK only usingL1-frequency GPS data reliably.In practice,it can save the cost for fast positioning by GPS and would be applied widely.