一种基于场强差的移动台定位改进算法

An Improved Mobile Station Positioning Algorithm Based on Field Strength Difference

为了解决传统的移动台定位过程中信号的传播误差对定位精度的影响,提出了一种基于移动台与服务基站之间的场强差来确定移动台位置的改进算法。小波变换在信号消噪处理中可以取得良好的效果,通过选择合适的小波函数和分解层数,对测量得到的场强差进行分解和重构,然后用经典Chan算法确定移动台位置,大大降低了传播误差对定位精度的影响。仿真表明,该算法能很好地抑制传播误差,其定位效果比直接使用Chan算法更加稳定。

In order to solve the influence of signal propagation error on mobile station positioning precision, an improved algorithm is proposed which is based on field strength difference between the mobile station and the base station to get the position of the mobile station. The wavelet transform has a good effect on the signal de-noising. By selecting the suitable wavelet function and decomposition layers, the measured field difference is decomposed and reconstructed. Then the classical Chan algorithm is used to get the position of mobile station, which can greatly reduce the effect of the propagation error on the positioning precision. The simulation results show that the algorithm can effectively suppress the propagation error and its performance is more stable than that of directly using Chan algorithm in the same environment.