Angle of arrival positioning system for tracking objects

Abstract

Systems and methods for determining user equipment (UE) locations within a wireless network using reference signals of the wireless network are described. The disclosed systems and methods utilize a plurality of in-phase and quadrature (I / Q) samples generated from signals provided by receive channels associated with two or more antennas of the wireless system. Based on received reference signal parameters the reference signal within the signals from each receive channel among the receive channels is identified. Based on the identified reference signal from each receive channel, an angle of arrival between a baseline of the two or more antennas and incident energy from the UE to the two or more antennas is determined. That angle of arrival is then used to calculate the location of the UE. The angle of arrival may be a horizontal angle of arrival and / or a vertical angle of arrival.

Description

[0001] This application is a divisional application of the Chinese invention patent application 201680066742.1 entitled "Arrival Angle Positioning System for Tracking Objects" filed on October 7, 2016. The related application of its parent application is incorporated herein by reference. technical field [0002] Embodiments of the present invention relate to wireless communication and wireless networking systems, and systems for radio frequency (RF) based identification, tracking, and location of objects, including real-time location services (RTLS). Background technique [0003] RF-based identification and location finding systems for determining the relative or geographic location of objects are generally used for tracking single objects or groups of objects and for tracking individuals. Traditional location finding systems have been used for localization in open outdoor environments. Typically RF based Global Positioning System (GPS) and Assisted GPS are used. However, ...

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Problems solved by technology

Furthermore, in the case of active DAS, the best accuracy (lower limit of error) is limited to 50 meters

Finally, Chen et al. do not address the impact of multipath on positioning accuracy in indoor environments, which are most severe (compared to outdoors) and in many cases lead to positioning errors much larger than claimed More (2 times -4 times)

[0023] The modifications made by Chen et al. for indoor wireless network antenna systems are not always feasible due to the enormous effort and cost involved in upgrading existing systems

Furthermore, in the case of an active DAS, the best theoretical accuracy is only 50 meters, and in practice this accuracy will be significantly lower due to RF propagation phenomena involving multipath

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