分布式无源定位技术的定位精度提高方法

为了提高无线传感器网络在无源定位时的定位精度,提出一种基于偏移圆圆心估计的定位误差校正(positioning error correction, PEC)算法。在PEC算法中，利用两步定位法在传感器获取的目标距离信息中获得的目标位置估计作为初值。在极坐标系中，将沿极径方向的固定偏移量引入到测距残差中形成偏移圆。利用偏移圆圆心的位置矢量对目标位置初始估计进行校正,从而获得更精确的目标位置估计。与经典分布式无源定位算法相比, PEC算法对传感器布局具有更强的适应性和更高的精度,在不同的传感器测距精度下均有较优异的性能,具有良好的工程应用前景。

Method of improving locating precision of distributed passive localization technology

To improve the locating accuracy of wireless sensor networks in passive localization, a positioning error correction (PEC) algorithm based on the estimation of offset circle center is proposed. In the PEC algorithm, the target position estimation, which is obtained by two-step locating method via the target range information extracted by the sensors, is taken as the initial value. In the polar coordinate system, a fixed offset along the polar direction is added to the range residual to form the offset circle. The position vector of the offset circle center is used to correct the initial target position estimation for obtaining a more accurate position estimation. Compared with the classical distributed passive localization algorithm, the PEC algorithm has strong adaptability and higher accuracy to sensor layout, and which has excellent performance under different sensor ranging accuracy and a good prospect of engineering application.