中文摘要：

针对改进的井下蒙特卡罗算法定位误差大的问题，提出一种基于信号强度的井下无线传感器网络蒙特卡罗移动节点定位算法。利用信号强度的变化来判断节点的运动方向，根据前一时刻的节点位置以及运动速度矢量来构建采样区域，采用一跳信标节点对样本进行过滤。仿真结果表明：该改进算法的定位精度得到了明显提高，适合于井下定位。

英文摘要：

Aiming at the localization error of the improved down hole Monte Carlo algorithm,a Monte Carlo mobile node localization algorithm for down hole wireless sensor networks based on signal strength is proposed.According to the change of signal intensity to judge the direction of motion of the node,the sampling area was constructed according to the node position and velocity vector of the previous time.Used one beacon to filer sampling.The simulation results show that the positioning accuracy of the improved algorithm is obviously improved,which is suitable for down hole positioning.