The Design and Implementation of a SDS-TWR Based Wireless Location System

摘要

In order to solve seamless positioning about indoor and outdoor, a SDS-TWR (Symmetric Double Side-Two Way Ranging) based wireless location system was proposed. The CSS (Chirp Spread Spectrum) signal, which has wide band characteristic, was used to obtain high-accuracy measurement of signal propagation delay. Least squares combining with linear Kalman filter algorithm was proposed in the positioning progress with linearization. Despite of increasing the complex of positioning algorithm, that improved the positioning accuracy, espe?cially the stability of dynamic positioning situation. Finally, a hardware prototype system was exploited. And some tests were carried in the real indoor and outdoor environment. The results show that ranging error would not change significantly with distance increasing. And both of static and dynamic positioning accuracy are under one meter.