Design Of Indoor Moving Target Location System Based On Ultra Wide Band

At present,the technology of Wireless Sensor Networks-WSN is developing rapidly.The Location Based Service-LBS technology in indoor environment has become a new research hotspot.Most of the existing location technologies are ranging and no distance measurement.The former is simple,but it is vulnerable to the influence of NLOS.The latter has more stringent requirements for location algorithm.Ultra Wide Band-UWB is a short distance wireless communication technology.It has the characteristics of high transmission rate,high time and space resolution,low power consumption,good secrecy and low cost.In this paper,based on ultra wideband technology and embedded system design indoor positioning system,the accurate positioning and track tracking of the moving target can be realized.The indoor mobile target positioning system based on ultra wideband(UWB)uses embedded system to complete the hardware design of location base station and mobile tag.The location of the base station is fixed and the location tag is installed on the mobile target.The location base station and mobile tag exchange data in real time by sending and receiving UWB data synchronously,and measure the location data information of the moving target,and complete the real-time location of the mobile object.The algorithm is optimized by the standard TDOA(arrival time difference)location algorithm.The measurement signals between the base station and label the arrival time difference and the establishment of hyperbolic cross model to achieve real-time positioning of the moving target,with Calman filtering and observation system state of the system input and output data of the optimal estimation,and combined with the actual target location parameter test of positioning accuracy is modified to reduce the positioning error and improve the system the accuracy,reliability and stability.The development of host computer application software is based on Qt(C++ graphical user interface application development framework),which can realize data transmission and remote information interaction with location base station,and display the moving track of location target in real time.Building a test platform,locating and tracking the moving target trajectory,comparative analysis of deviation of moving target trajectory and actual trajectory planning for system testing,the results show that the system overall communication stability,positioning error is about 20 cm,the realization of mobile target positioning and tracking.