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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.

Active Publication Date: 2017-05-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

But RTI is not suitable for complex environments, because the basic assumption of RTI is that when the target blocks the link, the RSS of the link will experience a large shadow fading, which is difficult to establish in an indoor environment, and the method based on fingerprint recognition does not need this limitation , so the fingerprinting method is more robust than the RTI method
However, in an indoor environment, although not all links that are blocked by the target will attenuate, there are still some links that are attenuated relatively, especially the links with stronger power. These links are called shadow fading links road

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  • Shadow fading assistance carry-free equipment positioning method
  • Shadow fading assistance carry-free equipment positioning method

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[0063] The present invention will be described in detail below with reference to the drawings and embodiments, and the technical problems and beneficial effects solved by the technical solution of the present invention will also be described. The flow chart of the shadow fading assisted non-portable device positioning method proposed by the present invention is as follows figure 1 As shown, it specifically includes the following implementation steps:

[0064] Step 1: Deploy wireless measurement nodes and construct a monitoring area:

[0065] K wireless measurement nodes working in the same frequency band and supporting the same communication protocol form a measurement node array and K≥2, place the measurement node array and 1 base station node in a 2-dimensional plane, and these nodes have the same physical structure , the area surrounded by the measurement node array constitutes the monitoring area D such as figure 2 shown; the coordinates of the K measuring nodes that co...

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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.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00G01S5/02
CPCG01S5/02H04W64/00
Inventor 许胜新刘珩陈思思王正欢卜祥元安建平辛怡
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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