Application And Research On The Scalability Of Network Based On UWB Positioning System

With the rapid development of wireless communication technology and the increasing demand for location-based services, outdoor positioning GPS and GSM technology are affected by roof occlusion, which can not meet the requirements of indoor location services.Although like infrared, Bluetooth, WiFi these technologies have been applied to indoor positioning and achieved some good results. However, in the face of increasingly saturated spectrum resources and positioning for the precision of the system, data transmission rate and higher scalability, the research of short distance wireless communication technology gradually entered the bottleneck. Under such background, ultra wideband wireless communication technology with high time resolution and wide bandwidth has highlighted the advantages of high indoor positioning performance.Because of the low transmitting power of ultra wideband wireless technology, the transmission distance of UWB signals is short. Therefore, most of the current research on positioning applications is carried out in a single area or a smaller area. In order to increase the range of UWB positioning system, this paper will be on the UWB indoor positioning system scalability study, mainly from the positioning results of stationary and wireless clock synchronization and network expansion to carry out research of the three parts. The technical research route includes three points: Kalman-filtering, the time synchronization of the base station and the wireless network. The research is based on the Hainan-EVK 2000 hardware platform, using the TDOA positioning algorithm, in the test of a floor containing four extended areas. In the test, the location performance of the two different motion states of the tag node is measured and moved. Based on a large number of positioning errors, moving trajectory stability and other characteristics of the test data, the result shows that even in the case of obstacles such as occlusion, UWB indoor positioning system can achieve better positioning results in the various regions, the error is relatively small.