基于无线局域网的三点定位模型

A Three Points Location Model Based on WLAN

目前的无线局域网定位模型并不成熟,主要有基于信号强度和依赖数据库的定位模型,缺乏大量实验的验证。基于信号强度的无线局域网物理定位模型由于信号常常受到环境因数干扰,难以准确描述信号强度与距离的变化规律,影响定位的精确性。提出了三点定位模型和基于插值的定位算法,算法能适当地描述信号强度和距离的相对变化规律,由此弥补了由信号强度波动引起的偏差,并且通过调整衰减比例得到比传统算法更好的精确度,同时降低了传统算法采样的复杂性。实验验证该模型可以满足无线定位的需求,具有较好的使用价值。

Current WLAN location model is not mature. There are mainly location models based on signal strength and dependent on database, and lack of substantial experimental verification. The physical location model based on signal strength of WLAN will be disturbed by environmental factors, so it＇s hard to accurately describe the changes of signal intensity and distance, thus affecting the accuracy of positioning. This paper proposes a three points location model and location algorithm based on interpolation, and the algorithm can describe the relative changes be- tween signal intensity and distance, thus making up the deviation caused by signal intensity fluctuations, and get better accuracy than the traditional algorithm by adjusting the ratio of decay, while reducing the complexity of traditional algorithm. Experiment verifies that the model can meet the demand for wireless location and is of application value.