Multi-path mitigation in rangefinding and tracking objects using reduced attenuation rf technology

A technology of distance and user equipment, applied in the field of systems including RTLS, can solve problems such as high work, low accuracy, and unresolved impact on positioning accuracy, and achieve the effect of improving accuracy and positioning accuracy

Active Publication Date: 2016-01-20
QUALCOMM TECHNOLOGIES INC
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  • Abstract
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  • Application Information

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Problems solved by technology

Also, with active DAS, the optimal accuracy (lower error limit) is limited to 50 meters
Finally, Chen et al. do not address the impact of multipath on positioning accuracy in indoor environments, where multipath is most severe (compared to outdoors) and in many cases produces much larger (2X -4X) positioning error
[0024] Modifications to indoor wir

Method used

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  • Multi-path mitigation in rangefinding and tracking objects using reduced attenuation rf technology
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  • Multi-path mitigation in rangefinding and tracking objects using reduced attenuation rf technology

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Embodiment Construction

[0061] Reference will now be made in detail to preferred embodiments of the present embodiment, examples of which are illustrated in the accompanying drawings.

[0062] The present embodiments relate to methods and systems for RF-based identification, tracking and localization of objects, including RTLS. According to an embodiment, methods and systems employ narrow bandwidth ranging signals. Embodiments operate in the VHF band, but can also be used in the HF, LF and VLF bands as well as the UHF band and higher frequencies. An embodiment employs a multipath mitigation processor. The use of a multipath mitigation processor increases the accuracy of tracking and positioning achieved by the system.

[0063] Embodiments include a small, highly portable base unit that enables a user to track, locate and monitor multiple people and objects. Each unit has its own ID. Each unit broadcasts an RF signal with its ID, and each unit can send back a return signal which may include its ID...

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Abstract

Methods for determining a LOB of one or more user equipment (UE) in a wireless system employing Time Difference of Arrival (TDOA) is described. TDOA techniques are based on estimating the difference in the arrival times of reference signals from multiple receivers or from multiple emitters to a receiver. A particular value of the time difference estimate defines a hyperbola between the two receivers on which the handset may exist. When the distance between the receiving antennas is small relative to the distance of the emitter source (the handset) being located, then the TDOA is equivalent to the angle between the baseline of the sensors (receivers antennas) and the incident RF energy from the emitter. If the angle between the baseline and true North is known, then the line of bearing (LOB) and/ or angle of arrival (AoA), can be utilized to determine the location of the UE.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 61 / 736,458, filed December 12, 2012, entitled "MULTI-PATHMITIGATIONINRANGEFINDINGANDTRACKINGOBJECTSUSINGREDUCEDATTENUATIONRFTECHNOLOGY." technical field [0003] The present embodiments relate to wireless communication and wireless network systems and systems including RTLS (Real Time Location Service) for radio frequency (RF) based identification, tracking and location of objects. Background technique [0004] RF-based identification and positioning systems for determining the relative position or geographic location of objects are commonly used to track single objects or groups of objects as well as to track individuals. Traditional positioning systems have been used for position determination in open outdoor environments. Typically RF based Global Positioning System (GPS) and Assisted GPS are used. However, conventional positioning system...

Claims

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Application Information

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IPC IPC(8): H04W4/02H04W8/02H04W48/04H04W4/20
CPCG01S3/74G01S5/06G01S5/10G01S5/0036H04W4/20G01S5/0218
Inventor 费利克斯·马尔霍夫斯基杜鲁门·普雷瓦特
Owner QUALCOMM TECHNOLOGIES INC
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