Research On WSN Positioning Technology For Internet Of Things

Wireless Sensor Network(WSN)is composed of a large number of micro-devices with wireless communication functions.Because of its low power consumption,low cost,distributed and self-organizing characteristics,WSN has attracted much attention in recent years.Wireless sensor networks provide information feedback to the outside world through the terminal sensors,but because the nodes of wireless sensor networks are usually deployed in relatively complex geographical environment,how to obtain high-precision node localization has become one of the hot research issues of domestic and foreign scholars.This paper mainly introduces the principle of wireless sensor network and its characteristics,the analysis of research status at home and abroad,the application fields and hot research areas,how to locate and the advantages and disadvantages of existing location algorithms and algorithms.The principles of several positioning algorithms are analyzed emphatically: GPS positioning technology,OTT(Over The Top,OTT)positioning technology,centroid algorithm,APIT algorithm,DV-Hop algorithm.In this paper,the principle and process of traditional DV-Hop algorithm are introduced,and the main sources of positioning errors are analyzed.In order to effectively suppress the influence of random distribution of network topology,the C-DV-Hop algorithm is studied in detail,and the pseudo-range error factor is defined to eliminate the reference nodes which have large errors in the calculation of the average hop distance of anchor nodes,so as to improve the calculation accuracy of the average hop distance.In order to obtain higher positioning accuracy,CC-DV-Hop algorithm regards anchor node as an unknown node to obtain its own positioning coordinates,thus calculating the coordinate correction value of anchor node,and applying the coordinate correction value of some anchor nodes to the coordinate correction of unknown node,and verifying the positioning accuracy through simulation data.