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Indoor positioning method based on conjugate gradient method

A conjugate gradient method and indoor positioning technology, applied in the direction of using re-radiation, measuring devices, instruments, etc., can solve the problem of inaccurate positioning of the centroid algorithm

Inactive Publication Date: 2018-01-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose an indoor positioning method based on the conjugate gradient method to solve the problem of inaccurate positioning of the centroid algorithm in RFID positioning technology in view of the defects of the background technology

Method used

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  • Indoor positioning method based on conjugate gradient method
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  • Indoor positioning method based on conjugate gradient method

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0057] Such as figure 1 As shown, in the present invention, due to the long RFID transmission distance and high positioning accuracy, the general positioning space is selected relatively large. When the present invention actually deploys RFID, considering cost and other factors, three RFID readers and one RFID tag are selected. RFID reader And the actual specific of the RFID tag is 20m.

[0058] Such as figure 2 Shown is a schematic diagram of the trilateral positioning algorithm of the present invention, with three reference nodes as the center of the circle, the corrected distance as the radius, three circles intersecting in one area, and three sets of equations are listed:

[0059]

[0060] Three sets of solutions are obtained separately, and the solution obtained in each set of equations is discarded, and the solution farthest from the remaining thi...

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Abstract

The invention discloses an indoor positioning method based on a conjugate gradient method, and belongs to the field of indoor positioning methods. Position estimation of an unknown label is conductedthrough a distance measuring method based on signal intensity, and optimal estimation is conducted on a result through an optimal method, and a position result with lowest errors is obtained. In a condition of a logarithm normal state transmission loss model, an intensity value of a received signal is measured, the influence of multiple aspects upon an RSSI value is taken into account, the RSSI value is corrected through a Gauss model and a mean value method, a distance is corrected through the least square method, the position of the unknown label is solved through a three-edge positioning algorithm, and the accurate position of the unknown label is solved by means of a conjugate gradient method in the optimal method. According to the method, the indoor positioning precision can be improved and positioning errors can be reduced.

Description

technical field [0001] The invention relates to the field of indoor positioning methods, in particular to an indoor positioning method based on a conjugate gradient method. Background technique [0002] Indoor positioning technology refers to the realization of position positioning in the indoor environment. It mainly uses wireless communication, base station positioning and other technologies to integrate a set of indoor position positioning system, so as to realize the position monitoring of people and objects in the indoor space. When satellite positioning cannot be used in an indoor environment, indoor positioning technology is used as an auxiliary positioning of satellite positioning to solve the problem that satellite signals are weak when they reach the ground and cannot penetrate buildings. [0003] The present invention adopts the RFID-based WSN positioning technology. RFID positioning technology uses radio frequency to conduct non-contact two-way communication and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/06G01C21/20
Inventor 董恒张志伟谭建勇
Owner NANJING UNIV OF POSTS & TELECOMM
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