将自适应选权滤波应用到参数估计中,对于合理地选取未知参数及其方差一协方差阵的初值,提出了利用选权拟合的方法。算倒结果表明,采用新方法单点定位可以在较短的时间内达到dm甚至cm级的精度。
The current mathematical model and parameter estimation method in precise point positioning(PPP) are introduced, then the adaptive filtering by selection of the parameter weights in the parameter estimation is applied. The selecting weight fitting method is employed to determine the initial parameters and the corresponding variance-covariance components. Two numerical experiments demonstrate that the position precision can achieve decimeter to centimeter in a short time, and that the feasibility and validity of the new method can be ensured.