Positioning method

A positioning method and technology for positioning nodes, applied in electrical components, wireless communication, etc., can solve problems such as limited model applicability

Inactive Publication Date: 2012-06-13
CHINESE ACAD OF SURVEYING & MAPPING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the parameters of the ordinary logarithmic model are relatively simple and...

Method used

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Embodiment 1

[0059] Embodiment 1, a ranging method, comprising:

[0060] Either one of the reference node and the node to be positioned is used as the wireless node of the transmitting end, and the other is used as the wireless node of the receiving end; the wireless node of the receiving end is obtained to obtain the received signal strength value PL ON ; Obtain the distance d between the receiving end and the wireless node of the transmitting end according to the parameters E0, E1, ..., Em3 obtained in the offline stage and the following formula:

[0061] PL on (d) = A-10 1+E0+E1+…+En · log(d) (6)

[0062] m3 is an integer greater than 2.

[0063] The method of this embodiment is proposed based on the following analysis.

[0064] According to the experimental results of many documents, it can be known that the path loss index factor N in the logarithmic model has a great correlation with the environment. As shown in Table 1, the value of N varies greatly in different environments. ...

Embodiment 2

[0096] Embodiment 2, a positioning method, such as figure 1 shown, including:

[0097] A. Select four wireless nodes with known positions as reference nodes; estimate the distance from the reference node to the node to be positioned according to the signal strength values ​​between the four reference nodes and the node to be positioned;

[0098] B. For the two-dimensional plane formed by every three reference nodes among the four reference nodes, according to the distances from the three reference nodes to the node to be positioned, the weighted centroid algorithm is used to obtain the approximation of the node to be positioned on the two-dimensional plane position, as the plane approximation point of the two-dimensional plane; a total of four plane approximation points are obtained;

[0099] C. According to the obtained four plane approximation points, use the weighted centroid algorithm again to find the position of the node to be located.

[0100] In this embodiment, a po...

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Abstract

The invention discloses a positioning method, which comprises the following steps of: selecting four wireless nodes with known positions as reference nodes; estimating a distance from each reference node to a node to be positioned according to a signal strength value between each reference node and the node to be positioned; for a two-dimensional plane consisting of every three of the four reference nodes, obtaining the proximity position of the node to be positioned on the two-dimensional plane by using a weighted centroid algorithm according to the distance from each of the three reference node to the node to be positioned as a plane approximation point of the two-dimensional plane, wherein totally four plane approximation points are obtained; and calculating the position of the node to be positioned by using the weighted centroid algorithm again according to the obtained four plane approximation points. A positioning result obtained by the positioning method is more reliable.

Description

technical field [0001] The invention relates to the field of positioning, in particular to a positioning method. Background technique [0002] With the popularity of wireless networks and the development of computer technology, location-based services (LBS) are getting more and more attention in real life, and people's demand for positioning and navigation is increasing. The current general-purpose GPS positioning has been applied in various fields, but the GPS signal will be interrupted or the quality is poor in special environments, such as indoors, underground passages, mines, complex buildings, etc. Emerging wireless navigation and positioning technologies have emerged one after another, such as Zigbee, RFID (Radio Frequency Identification, radio frequency identification), UWB (Ultra Wideband, ultra-wideband wireless technology), WIFI (wireless fidelity, wireless fidelity) and so on. [0003] ZigBee technology is a short-distance wireless communication protocol based on...

Claims

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Application Information

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IPC IPC(8): H04W64/00
Inventor 高星伟李英成陈群李海涛郭杭
Owner CHINESE ACAD OF SURVEYING & MAPPING
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