一种组合模糊度搜索方法的研究

Study of a Combined GPS Carrier Phase Ambiguity Search Algorithm

GPS数据质量直接影响模糊度搜索的正确与否。首先对GPS数据质量进行控制,利用现有的几种模糊度 搜索方法的优点,组合成一种模糊度搜索方法,并从三个方面对其进行检验,即RATIO检验、OVT检验、多项式拟合残差 检验。为验证该算法,用单频GPS接收机进行了实验,利用文中的方法在31s以内正确确定了模糊度,其基线长误差小 于1cm,表明该方法不但可以改进模糊度的搜索速度,而且可以进一步提高可靠性和成功率。该方法可广泛应用于定向 及姿态测量。

The quality of GPS data directly influence the rightness of the ambiguity search.Firstly,the quality of GPS data is controlled,an combined ambiguity search method is constituted when made use of the advantage of the existing fast ambiguity search method,and the ambiguity is tested from the three different aspects,namely ratio test, OVT test and polynomial fit of phase residuals test.We had made an experiment with single frequency receiver to verify the algorithm.When the experiment data was processed by the method,the ambiguity can be fixed rightly in 31s,and the error of its baseline is within 1cm.The results of our tests indicate that the above algorithm can improve the ambiguity search speed and its reliability.the method can be extensively applied to Orientation and attitude measure.