Ultra-wideband aoa indoor positioning method based on ica and cs

Abstract

The present invention is an ultra-wideband AOA indoor positioning system and positioning method based on ICA and CS, including a positioning terminal, a base station, a server and a host computer. The positioning system adopts ultra-wideband AOA direction finding positioning to obtain positioning data, and the base station receives the positioning data of the positioning system. And transmit the positioning data to the server connected to the host computer to realize terminal positioning monitoring. The invention adopts the method of combining non-Gaussian independent component analysis (ICA) and compressed sensing (CS) theory to solve the multipath signal interference problem of ultra-wideband AOA positioning. The non-Gaussian Independent Component Analysis (ICA) algorithm utilizes the non-Gaussian nature of the signal, and has higher angular resolution and computational accuracy than the classical MUSIC algorithm. A method for sparse signal reconstruction, which solves the underdetermined problem of obtaining the directions of arrival of the direct and multipath components from the composite steering vector.

Description

technical field [0001] The invention relates to the technical field of positioning systems, in particular to an ultra-wideband AOA indoor positioning system and a positioning method based on ICA and CS. Background technique [0002] With the continuous improvement of people's living needs and the rapid development of modern wireless communication technology, wireless positioning technology has attracted more and more attention and attention. It is not only widely used in the military field, but also quickly enters our daily life. play an important role. For example: searching for children in supermarkets, searching for lost suitcases at airports, and searching and rescuing trapped people in rubble during earthquakes. How to improve positioning accuracy in these relatively closed and dense indoor environments is an important aspect of wireless positioning technology research. [0003] At present, there are a variety of relatively mature wireless positioning technologies, bu...

AI Technical Summary

Problems solved by technology

[0003] At present, there are a variety of relatively mature wireless positioning technologies, but these technologies and methods have different degrees of defects when used in indoor positioning: infrared signals are intelligently transmitted in a small range, easily affected by fluorescent lamps or lights in the room, and cannot reach High-precision positioning; GPS positioning system is a relatively mature system at present. It can achieve high positioning accuracy in outdoor environments. It uses satellite signals, so it has a wide coverage and does not require a signal generator. However, it is difficult for the signal to be attenuated in space. WIFI positioning is often used for indoor positioning because of its low cost, but it is easily interfered by other signals, which directly leads to a decrease in positioning accuracy, and The locator has relatively high energy consumption; Bluetooth technology is also suitable for small-scale positioning, with large fluctuations in positioning errors and large fluctuations due to noise signal interference

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