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针对井下移动节点无线定位算法,在能量计算定位算法的基础上,设计了一种自适应分类选择的3点定位算法。算法将任意单点位置采集的N个点中能量距离信息通过排序的方法分类,将相似类中具有特征性强的保留并自适应选择3个特征强的位置点,再通过3个信标点定位算法获取目标点的准确位置。仿真计算了最小响应功率与路径损耗系数这2个重要参数对能量计算的影响。对不同环境下3个未知目标节点进行定位测试,测距结果显示随着距离的增大,测距精度降低,但在100 m范围内测距误差均低于4%。经3点定位算法分析计算后,被测目标的坐标与真实目标位置误差小于1.0 m。
Aiming at the wireless location algorithm of underground mobile node, based on the energy calculation and location algorithm, a 3-point location algorithm with adaptive classification and selection is designed. The algorithm classifies the energy distance information of N points collected at any single point position by the method of sorting, retains the characteristic similar strongholds and adaptively selects 3 strong feature points, and then locates them by 3 beacon points The algorithm gets the exact location of the target point. The influence of two important parameters, the minimum response power and the path loss coefficient, on the energy calculation is simulated. The localization test of three unknown target nodes in different environments shows that the ranging accuracy decreases with the increase of distance, but the ranging error is less than 4% in the range of 100 m. After 3-point positioning algorithm analysis and calculation, the measured target coordinates and the actual target position error is less than 1.0 m.