在基于接收信号强度指示(RSSI)的无线传感器网络节点定位问题中,为了提高节点的定位精度,通过对无线电传播路径损耗模型的分析,提出了基于RSSI测距的改进距离估计公式。针对已有节点校正方法存在的不足,提出了将一次循环校正后所有校正坐标的质心作为新的节点位置的校正方法。实验结果表明,改进的距离估计公式有效地提高了节点间的距离精度,并在适当增加节点计算量前提下,节点位置校正使节点的定位精度更高,达到良好的定位效果。
To improve node localization accuracy in wireless sensor networks, an improved estimator formula for alstance is presnted based on RSSI-ranged localization model after the analysis of the radio propagation path loss model. Due to the shortcoming of the existing position correction method, a new method is proposed, whichthecenterofmassofallcorrectedcoordinatesisregardedasanewcorrected position after a loop position correction. The simulation results show that the improved distance formula can greatly enhance the distance accuracy, and the new correction in position also increases the localization accuracy of unknown nodes at the cost of increasing appropriate computation overhead, the improvements achieves perfect localization effects.