Research On Indoor Target Positioning System Based On Wireless Sensor Network

Accurate indoor target localization is the core foundation of indoor application projects. But there are many obstacles and multiple source of interference and other factors in the indoor positioning environment, it makes the positioning system difficult to build model and position timeliness. Aiming at the diversity of indoor positioning environment, through the advantages of wireless sensor networks in layout and networking mechanisms, deployment of an indoor beacon by a mobile target network with wireless signal device. We divided the indoor position process into three modules:RSSI distance estimation, target location initialization, target location optimization. Based on the theoretical analysis and simulation experiments, we research the key technology and algorithms in this paper. The main contributions of this paper are as follows:1. In the RSSI distance estimation module, it is proposed to introduce the strategy of environmental factor data in the inverse calculation model of the existing beacon organization control network map. This strategy can improve the range estimation accuracy and timeliness of the location system, breakthrough former indoor distance estimation scheme in the experience of environmental factors and solid state set, approximation of the true state of environment is the study in precise indoor distance estimation to solve the innovation of thinking level.2. Put forward on the foundation to obtain the target initial position increased Network iteration optimization step, the positioning problem of modeling for seeking the optimal solution of the nonlinear equations, and the distance between unknown nodes and beacon estimated value and the coordinates of unknown nodes and columns for solving for the unknowns in the equations. This strategy can be optimized at the same time to the unknown node coordinates and distance estimation, which is the innovation of this research in the aspect of algorithm modeling.The research results of this paper provide the method selection and strategy guidance for indoor target localization based on wireless sensor networks, and it has good practical value and application prospect.