Abstract: In wireless sensor network indoor positioning, different transmission power disturbs the accuracy of positioning which is wireless localization algorithm based on Log-normal model. Based on real RSSI values change of indoor environment, this paper proposes a kind of indoor location optimization algorithm of different transmission power. By determining the minimum dynamic area and optimizing the RSSI ranging method, this algorithm reduces the influence of different transmission power. Simulation and experimental results show that when practicing different transmission power this algorithm achieves same accurate positioning as what is under consistent beacon node transmission power.

Key words: path loss model, attenuation factors, dynamic area, Received Signal Strength Indicator（RSSI） distance measurement, indoor positioning

摘要： 在无线传感网络室内定位中，节点的发射功率不同会降低基于对数-正态模型的定位算法的定位精度。针对这一问题，基于真实室内环境下RSSI值的变化，提出了一种基于不同发射功率的室内定位优化算法。该算法通过确定最小动态区域，对RSSI测距方法进行优化，降低不同发射功率带来影响。仿真和实验结果证明，提出的新算法在参与定位的信标节点发射功率不一致的情况下，达到了信标节点发射功率一致情况下的定位精度。

关键词: 路径损耗模型, 衰减因子, 动态区域, 接收信号强度指示器（RSSI）测距, 室内定位