A single access point positioning method based on csi angle of arrival and time difference of arrival

Abstract

The invention discloses a arrival angle and arrival time difference single access point positioning method based on CSI. The method comprises the following steps: 1, dividing multiple antennas of a single access point into multiple groups, wherein the antenna group at a relatively long distance is used for acquiring arrival time difference positioning information, the antenna group at a close distance is used for acquiring arrival angle positioning information; 2, scanning a plurality of CSI samples of each antenna of the single access point; 3, calculating direct wave arrival time differencesof different antennas of the single access point of the to-be-positioned target; 4, calculating a direct wave arrival angle of each antenna array of the single access point of the to-be-positioned target; and 5, establishing a target position constraint equation based on the arrival time difference and the arrival angle, and calculating the target position according to the coordinates of each antenna of the single access point. The method is compatible with an existing communication protocol, and the complexity and cost of deployment of a single access point positioning system can be effectively reduced; and meanwhile, the complementary advantages of AOA and TDOA signals are utilized, so that an accurate and reliable positioning result can be ensured.

Description

technical field [0001] The invention relates to a positioning method for a single access point, in particular to a positioning method for a single access point based on a CSI-based angle of arrival and time difference of arrival, and belongs to the field of indoor positioning. Background technique [0002] Most of the existing Wi-Fi positioning methods require multiple access point signals to ensure that sufficient position calculation information is obtained. However, Wi-Fi first serves data communication, and its signal coverage area needs at least one available access point. Due to the influence of indoor obstacles, it is often impossible to ensure that multiple access points are available. Compared with multiple access point positioning, single access point positioning can significantly improve the availability and signal coverage of Wi-Fi positioning, and is currently a frontier research hotspot in Wi-Fi positioning. [0003] The principle of single access point positi...

AI Technical Summary

Problems solved by technology

However, the existing TOA estimation algorithm used in single access point positioning is affected by the CSI phase error, resulting in insufficient positioning accuracy, or the need to use frequency hopping technology to affect the normal communication function of Wi-Fi, which limits the large-scale application of single access point positioning

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