Positioning method based on RSSI dynamic path loss

A positioning method and dynamic path technology, applied in the positioning field of wireless sensor network field, can solve the problems of large impact on positioning accuracy, RSSI dynamic path loss, etc.

Inactive Publication Date: 2014-09-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The present invention overcomes the shortcomings of prior art that environmental factors have a g

Method used

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  • Positioning method based on RSSI dynamic path loss
  • Positioning method based on RSSI dynamic path loss
  • Positioning method based on RSSI dynamic path loss

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Embodiment Construction

[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] A positioning method based on RSSI dynamic path loss, the steps are as follows:

[0037] (1) Calculate the path loss index of the environment where the card reader i is located through k card readers with a similar distance to the card reader i, assuming that the environment of the k unknown points with a similar distance to the same reader i is highly similar, That is, the path loss index height approximation formula of k tags to be located within a certain size range is expressed by the formula:

[0038] n i = kPL ( d 0 ) - Σ j = 1 ...

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Abstract

The invention relates to a positioning method based on RSSI dynamic path loss. The method comprises steps that: a path loss index of a location environment of a card reader i is calculated through k card readers having a short distance from the card reader i; the first step is repeated, each acquired n value and a corresponding RSSI value are recorded in a database; the card readers are arranged in a special environment, a label to be positioned is moved, RSSI values of h card readers detecting minimum signal attenuation are selected to calculate a distance; distances between the label to be positioned and each card reader can be acquired through substitution of Pm, P0 and nm values; according to a distance formula, relations between the label to be positioned and the h card readers are expressed; the coordinate (x,y) of the label to be positioned can be acquired through a minimum mean square deviation estimate X = (ATA) -1ATb.

Description

technical field [0001] The invention relates to a positioning method used in the field of wireless sensor networks, in particular to a positioning method based on RSSI dynamic path loss. Background technique [0002] Wireless positioning refers to the use of radio wave signals to determine the position of a mobile device in a certain reference coordinate system. With the rapid rise of wireless sensor network technology, a large number of wireless sensor network positioning algorithms have been proposed, which are mainly divided into positioning technology without ranging and positioning technology based on ranging. In an actual positioning system, a Received Signal Strength Indication (RSSI) is commonly used for distance measurement, and a trilateration method is used for positioning. The advantages of RSSI are low cost, low power consumption, and easy implementation. The propagation path of the signal may encounter walls, obstacles, etc. Due to the obstruction of obstacle...

Claims

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Application Information

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IPC IPC(8): H04W64/00H04W84/18
Inventor 陈河军何熊熊卢昱
Owner ZHEJIANG UNIV OF TECH
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