Position fingerprint locating method performing self-adaption adjusting based on access point (AP) weight

A self-adaptive adjustment and fingerprint positioning technology, which is applied to location information-based services, electrical components, wireless communications, etc., can solve the problem of low positioning accuracy and achieve the effect of improving positioning accuracy

Active Publication Date: 2012-11-28
BEIJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

However, almost all existing positioning systems and algorithms treat the impact of each AP on the matching algorithm equally, and the positioning accuracy is not high

Method used

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  • Position fingerprint locating method performing self-adaption adjusting based on access point (AP) weight
  • Position fingerprint locating method performing self-adaption adjusting based on access point (AP) weight
  • Position fingerprint locating method performing self-adaption adjusting based on access point (AP) weight

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Embodiment 1

[0055] In a typical rectangular indoor scene, the entire area to be located is about 30m×21.5m. There are hundreds of reference points and a dozen wireless access points evenly distributed in the area. After obtaining the measured signal strength of the target point, the approximate location of the target point is preliminarily estimated according to the nearest neighbor algorithm commonly used in position fingerprint positioning technology, taking it as the center of the circle, and Select the adjacent reference point set S of the target point for the circular area of ​​radius. The resolution parameters of each access point to the reference points in the set S are calculated according to formula (4). From the above calculation results, it is known that the ratio of the maximum value to the minimum value of the resolution parameter is about 80, then the function Make the ratio of the maximum value to the minimum value of the transformed f(ζ) lower than the threshold value ...

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Abstract

The invention relates to the technical field of wireless location and discloses a position fingerprint locating method performing self-adaption adjusting based on access point (AP) weight. The position fingerprint locating method performing self-adaption adjusting based on AP weight calculates weight of each access point according to resolving power nearby target point preliminary estimating positions, has certain self-adaptivity, and can improve locating accuracy based on position fingerprint locating technology. Besides, monotone increasing function is adopted to perform smoothing of resolution parameters, thereby avoiding effectiveness loss of certain access points caused by local big difference brought by directly using the resolution parameters.

Description

technical field [0001] The invention relates to the technical field of wireless positioning, in particular to a position fingerprint positioning method based on AP weight self-adaptive adjustment. Background technique [0002] Existing wireless positioning technologies can be broadly classified into ranging-based positioning and non-ranging-based positioning technologies. For example, traditional positioning technologies based on TOA (Time of Arrival) / TDOA (Time Difference of Arrival) / RSS (Received Signal Strength) are calculated based on these time or signal strength parameters. The approximate distance between the base station and the target point (such as a mobile station), and then use the geometric position relationship between the base stations to locate the target point. These ranging-based positioning technologies are easily interfered by non-line-of-sight situations, and their positioning accuracy and stability are poor for wireless channels with high complexity an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/02H04W64/00
Inventor 崔琪楣张平邓金刚张雪菲史玉龙
Owner BEIJING UNIV OF POSTS & TELECOMM
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