Positioning method and device based on calibration point

A positioning method and a technology for calibrating points, applied in electrical components, wireless communications, etc., can solve the problems of low positioning technology accuracy, large impact on positioning accuracy, and accuracy deterioration

Active Publication Date: 2012-03-28
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Both AOA and TOA positioning technologies in the prior art require special equipment support, and are seriously affected by NLOS (Non Line Of Sight) and multipath, and the accuracy of positioning technology is not high
RSSI has a strong dependence on the channel transmission model, and multipath effects, occlusion and environmental changes will seriously deteriorate its accuracy
LF positioning technology is simple to implement and has high precision, but there is also a problem that the positioning accuracy is greatly affected by environmental changes when relying solely on RSSI fingerprint feature positioning

Method used

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  • Positioning method and device based on calibration point
  • Positioning method and device based on calibration point
  • Positioning method and device based on calibration point

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] see Figure 4 , the embodiment of the present invention provides a positioning method based on calibration points, the method comprising:

[0062] Step 101: Determine the coordinate information of at least four calibration points in the preset area to be tested;

[0063] Step 102: According to the positional relationship between at least three base stations in the area to be measured and the calibration point, determine the mirror point of each base station, and set the coordinates of the mirror point of each base station;

[0064] Step 103: Establish a relational expression according to the coordinate information of at least four calibration points, the coordinates of the mirror image points of at least three base stations, and the positional relationship between the base station and the calibration point in the area to be measured, and solve the relational expression to obtain the positioning The coordinate information of the terminal.

[0065] The method provided b...

Embodiment 2

[0067] The embodiment of the present invention proposes a technical solution for locating the two-dimensional coordinates of the positioning terminal when the coordinate information of the calibration point is a horizontal coordinate. see Figure 5 , the embodiment of the present invention provides a positioning method based on calibration points, the method comprising:

[0068] Step 201: Establish a database of calibration points in the area to be measured, in which at least the coordinate information of the calibration points in the area to be measured and the signal characteristic values ​​of each base station measured at each calibration point are pre-stored.

[0069]Specifically, several calibration points are set in the area to be tested, and these calibration points can receive signal characteristic values ​​of multiple base stations, and each calibration point corresponds to a piece of coordinate information. In the embodiment of the present invention, when the area t...

Embodiment 3

[0099] The embodiment of the present invention proposes a technical solution for locating the three-dimensional coordinate information of the positioning terminal when the coordinate information of the calibration point is three-dimensional coordinate information. see Figure 7 , the embodiment of the present invention provides a positioning method based on calibration points, the method comprising:

[0100] Step 301: Establish a calibration point database of the area to be measured, in which at least the three-dimensional coordinate information of the calibration points in the area to be measured and the signal characteristic values ​​of each base station measured by the calibration points are pre-stored.

[0101] Wherein, this step is the same as the method in step 201 above, and will not be repeated here.

[0102] Step 302: Determine the three-dimensional coordinate information of at least four calibration points required for positioning in the preset calibration point dat...

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Abstract

The invention discloses a positioning method and a device based on calibration point, which belongs to the field of wireless networks. The positioning method comprises the following steps: coordinate information of at least four calibration points in a preset area to be measured is determined; a mirror point of each base station is determined according to the position relationship between at least three base stations in the area to be measured and the calibration points, and the coordinate of the mirror point of each base station is set; a relational expression is built according to the position relationship between the coordinate information of at least four calibration points, the coordinates of mirror points of at least three base stations as well as the base stations in the area to be measured and the calibration points, and the coordinate information of a positioning terminal is obtained through operating and solving the relational expression. The invention utilizes the coordinate of a presorted calibration point to inversely calculate the coordinate of the mirror point formed by the last reflection of a signal arriving at the calibration point through the characteristic in the process that the signal sent by the base stations is transmitted to the calibration point, further works out the coordinate information of the positioning terminal, eliminates the influence of a non-line-of-sight error on positioning effect, and improves the precision of the positioning.

Description

technical field [0001] The invention relates to the field of wireless positioning, in particular to a positioning method and device based on calibration points. Background technique [0002] With the rapid development of technologies such as wireless networks, mobile communications and pervasive computing, LBS (Location-based Services) and Location-aware Computing are becoming more and more important. It has a wider range of applications, but it is difficult to apply indoors and urban environments with high-rise buildings due to weak satellite signals. [0003] At present, among the various existing wireless positioning technologies, most of the geometric positioning methods based on AOA (Angle of Arrival), TOA (Time of Arrival), and AOA are used to estimate the positioning of the mobile terminal by measuring the characteristic parameter values ​​of the signal. Angle, to determine the position of the target on the two-dimensional plane. [0004] Among them, the positioning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00
Inventor 邓中亮余彦培李合敏邓耀宇袁协来奇峰那日苏徐连明朱宇佳
Owner BEIJING UNIV OF POSTS & TELECOMM
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