Research Of UWB Single Station Positioning Technology Based On Compressive Sensing

Ultra-wideband signal with low power density,anti-multipath capability,good robustness and high accuracy of ranging,widely used in communications,radar,imaging,high-precision positioning and other fields,based on ultra-wideband signal short-range target location is the current One of the industry hot research technology.Because of the high bandwidth,the traditional Nyquist sampling method has become the bottleneck of engineering implementation.The development of compression sensing theory provides a new theoretical support for solving this problem.This paper focuses on the research of UWB positioning technology based on compression perception,The main work is as follows:1,This paper studies the basic technical problem of Nyquist sampling for UWB signal.Based on the deepening of the theory of compression perception,this paper uses Bayesian compression sensing method to implement ultra-wideband positioning reference signal with sparse characteristics Compression sampling and reconstruction,in ensuring good signal recovery performance under the premise of greatly reducing the sampling frequency can be applied to the actual ultra-wideband positioning system.2,non-line-of-sight propagation error suppression is the key technology of signal delay estimation,but also the ultra-wideband signal delay estimation difficult.In this paper,based on the study of NLOS error characteristics and classical NLOS suppression method,a TOA estimation algorithm based on compression perception relative energy detection is proposed.The algorithm calculates the relative energy of the interval by compressing the sampled and reconstructed signal,and then uses the search algorithm to find the maximum value of the relative energy,and takes the corresponding time interval as the time delay estimation result.Compared with the traditional TOA estimation method,the algorithm has high complexity and high delay estimation accuracy.3,ultra-wideband multi-station positioning system is often on the station between the synchronization and information exchange requirements demanding,resulting in a huge system complexity,this paper discusses the antenna-based single base station positioning method,the method uses L-type UWB antenna array for signal reception And then use the CS-TOA algorithm for each channel of the array to do the delay estimation,and the bit algorithm to get the positioning results.This method can effectively reduce the difficulty of system deployment and improve the easy maintenance and easy implementation under the premise of ensuring the positioning accuracy.