一种GPS快速定位技术研究

The Research on GPS Quickly Positioning Technique

用LAMBDA方法确定GPS载波相位测量的整周模糊度,需要较高精度的浮点解。但用短时间GPS观测值构建的法方程容易出现病态,以致法方程的解很不稳定。本文使用谱修正迭代法,消除法方程病态,进而用LAMBDA方法确定整周模糊度。我们的实验结果表明,对于1min左右的单频GPS载波相位测量,利用本文方法即可正确地解算出它的整周模糊度,从而实现厘米级定位。

When using the LAMBDA method to fix an integer ambiguity of GPS carrier phase measurements it is necessary to have a high accuracy of float solution. But the normal equation that is constituted by short time observables of GPS carrier phase measurements presents easily an abnormal state. It results in very instable solution for the normal equation. This paper proposes the algorithm that uses a spectrum correction iteration to eliminate the abnormal state of the normal equation, and then LAMBDA method is used to solve for the integer ambiguity of GPS carrier phase measurements. The results of our tests indicate that the above algorithm can solve precisely for the integer ambiguity of GPS carrier phase measurements of single frequency at around one minute, and acquire cm-level positioning.