基于加权水平精度因子的伪卫星基站选择方法

Pseudolite’s Station Selection Method Based on Weighted Horizontal Dilution of Precision

提出一种以加权水平精度因子为依据的基站选择方法,该方法根据基站和用户的相对位置给予每个基站不同的权值,降低测量误差较大的基站被选中参与定位的可能性。通过对伪距测量误差数学模型的分析,推导伪卫星定位系统加权矩阵,并设计了基于基站对WHDOP贡献的基站选择方法。仿真结果表明,该方法能更加高效、准确地实现伪卫星基站的选择,降低接收机的计算量,提高系统的定位精度。

We propose a station selection method for pseudolite system based on weighted horizontal dilution of precision.This method gives different weights to each station according to the relative position of station and receiver,reducing the possibility that stationsthathave large measurement error areselected to participate in positioning.We analyze the mathematical models of pseudo-rangemeasurementerror,and the WHDOP expression is analyzed in detail.Station selection based on the contribution of WHDOP is designed.The simulations reveal that the method can select stations efficiently and accurately,thereby reducing the calculation amount of the receiver and improving the positioning accuracy of the system.