Shadow fading assistance carry-free equipment positioning method

A technology of shadow fading and positioning method, which is applied in the field of wireless positioning in wireless networks, and can solve problems such as not suitable for complex environments, shadow fading, link attenuation, etc.
CN106793076AActive Publication Date: 2017-05-31BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2017-05-31

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Abstract

The invention discloses a shadow fading assistance carry-free equipment positioning method, and belongs to the technical field of wireless positioning in a wireless network. Wire nodes surrounding a monitoring region build a fingerprint database in an offline stage through the RSS (received signal strength) change of a measuring object in each training position; in the online stage, the shadow fading link detection is firstly performed; then, the positioning algorithm is selected according to different conditions of the shadow fading region intersection set. When an objective does not detect the shadow link in the position, a conventional fingerprint recognition method is still used; when the shadow fading link exists, the mode matching is only performed in a shadow fading region; when the shadow fading links are many, for example, the objective is positioned in the center of the monitoring region, the center of the intersection region is taken to be used as the objective position estimation. The method has the advantages that the shadow fading and the fingerprint recognition are combined; the shadow fading link is effectively utilized for assisting the fingerprint recognition, so that the target positioning is more precise.
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Description

technical field

[0001] The invention relates to a positioning method for a portable device, which is a positioning method for a portable device assisted by shadow fading, and belongs to the technical field of wireless positioning in a wireless network. Background technique

[0002] Target location information plays an important role in many applications, such as location-based services (LBS), smart home, and health care. Traditional positioning methods such as cameras, WiFi positioning, and inertial sensors all require the target to carry a positioning device. In many cases, it may be inconvenient for the subject (eg, a patient) to carry the device. Recently, a lot of attention has been paid to the device-free localization (DFL) method, which does not require any device to be carried by the target. It exploits target-induced changes in link Received Signal Strength (RSS), which can be obtained by wireless devices widely present in the environment.

[0003] At present, DFL...

Claims

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