Autonomous direction finding using differential angle of arrival

A directional antenna and beacon signal technology, applied in the field of tracking, can solve problems such as complex antennas, and achieve the effect of reducing current consumption and simple antenna design

Inactive Publication Date: 2015-10-28
KONINKLJIJKE PHILIPS NV
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  • Claims
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Problems solved by technology

As another example, complex and / or bulky antennas (such as high-gain directional antennas) are required

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  • Autonomous direction finding using differential angle of arrival
  • Autonomous direction finding using differential angle of arrival
  • Autonomous direction finding using differential angle of arrival

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Embodiment Construction

[0030] To address direction and range in autonomous direction finding, this application describes a one-way tracking system that combines the use of radio frequency (RF) beacon transmitters on tracked objects with direction finding (DF) equipment combination. DF devices use differential time-of-flight (DToF), received signal strength indicator (RSSI), electronic compass, and directional antennas to provide bearing and range estimates to the object. The tracking system reduces tracking problems caused by multipath environments by determining a position from the signal with the shortest time-of-flight (ToF) and thus the fewest reflections. This enables the best estimation of the shortest path to the object and eliminates the need for two-way communication. This allows DF devices to achieve maximum link budget, and allows DF devices to operate in ranges where bi-directional communication is not possible.

[0031] In one embodiment, the tracking system is used to track Alzheimer...

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Abstract

A system (10) and a method (150) track a tracking device (14). A radio frequency (RF) receiver (52) is configured to receive a periodic beacon signal originating at the tracking device (14). The periodic beacon signal is received with a directional antenna (36) at multiple bearings over time. An estimator (70) is configured to estimate a bearing to the tracking device (14) as the bearing of the multiple bearings in which a time of flight (ToF) of the periodic beacon signal is lowest. The RF receiver (52) can further be configured to simultaneously receive multiple instances of the periodic beacon signal with the directional antenna (36) at a bearing of the multiple bearings. In such instances, the RF receiver (52) is further configured to correlate the instances to identify which of the instances has a lowest ToF.

Description

technical field [0001] This application generally relates to tracing. This application finds particular application in connection with, and will be described with specific reference to, Alzheimer's patients. However, it should be understood that the present application is also applicable to other usage scenarios, such as tracking commodities, goods, materials or vehicles, and is not necessarily limited to the above-mentioned applications. Background technique [0002] The home health care tracking system for wandering Alzheimer's patients allows the patient to be located once outside the Alzheimer's patient's defined safe zone or geofence. When a patient leaves the corresponding safety zone or geofence, an alarm signal and / or tracking service is enabled. For example, an alarm signal could trigger an alarm, such as a cellular alarm, to a caregiver or a remote call center where a Personal Response Assistant (PRA) points to an emergency. For example, the tracking service can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/38
CPCG01S3/38G01S5/06
Inventor S·莱丁厄姆K·C·J·韦杰布兰斯P·K·雷迪
Owner KONINKLJIJKE PHILIPS NV
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