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RIPS系统通过测量干涉信号的相位提供了一种精度高、设备简单的无线传感器网络定位方法.但利用相位进行测距和定位的方法不可避免地存在相位模糊问题,RIPS系统采取的方式是在多个频率下对某一距离差进行相位测量,根据各相位测量值来搜索实际距离差.为了避免RIPS系统中这种繁复的搜索过程,文中提出了一种高效的距离差估计方法.该方法基于中国余数定理(CRT)通过闭式一次直接计算得出距离估计值,从而避免了搜索过程,极大地降低了节点运算能耗并且提高了定位系统的实时性.同时,为了克服传统CRT算法对噪声敏感的缺点,利用算法中加权系数具有的一些性质来减小噪声对估计结果的影响,提高了算法的鲁棒性.仿真结果表明该方法鲁棒性好,估计精度高,在无线传感器网络中具有良好的可行性.
The RIPS system provides a high accuracy and simple device positioning method for wireless sensor networks by measuring the phase of the interferometric signals.But the phase ambiguity problem inevitably exists in the method of ranging and positioning using phase, and the RIPS system adopts the method of more And the actual distance is searched according to the measured value of each phase.In order to avoid this complex search process in RIPS system, an efficient method of distance difference estimation is proposed in this paper.The method is based on The Chinese Remainder Theorem (CRT) obtains the distance estimation through the direct computation of a closed-loop method, thus avoiding the search process, greatly reducing the node energy consumption and improving the real-time performance of the positioning system.At the same time, in order to overcome the noise Sensitivity of the proposed method, some of the properties of the weighting coefficients are used to reduce the effect of noise on the estimation results and improve the robustness of the algorithm.The simulation results show that the proposed method is robust and has high estimation accuracy. In wireless sensor networks With good feasibility.