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RSSI (Received Signal Strength Indication) based indoor moving target location method

A technology of moving target and positioning method, which is applied in the field of indoor moving target positioning based on RSSI, and can solve problems such as large ranging error, low positioning accuracy, and poor stability

Inactive Publication Date: 2017-01-25
SHANGHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a RSSI-based indoor moving target positioning method to solve the problems of large ranging errors, low positioning accuracy and poor stability in the existing indoor RSSI-based ranging and positioning technology

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  • RSSI (Received Signal Strength Indication) based indoor moving target location method
  • RSSI (Received Signal Strength Indication) based indoor moving target location method
  • RSSI (Received Signal Strength Indication) based indoor moving target location method

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Embodiment Construction

[0052] In order to better illustrate the present invention, the present invention will be described in detail with a preferred embodiment and with accompanying drawings, specifically as follows:

[0053] Such as figure 1 As shown, this embodiment provides an RSSI-based indoor moving target positioning method, which specifically includes the following steps:

[0054] S1: Arrange several beacon nodes indoors according to the preset rules, record the ID and coordinates of each beacon node, and calculate the actual distance between the beacon nodes according to the coordinates;

[0055] S2: The control center controls the beacon nodes to send radio frequency signals, each beacon node detects the RSSI attenuation value of the radio frequency signals received from each other, and the control center calculates the RSSI ranging model according to the actual distance and the RSSI attenuation value The parameters are corrected in real time to obtain the corrected RSSI ranging model;

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Abstract

The invention provides an RSSI (Received Signal Strength Indication) based indoor moving target location method, which comprises the following steps: laying beacon nodes according to the law to obtain the actual distance between the beacon nodes; the beacon node sending radio frequency signals and mutually detecting the RSSI value of the received signals, and correcting parameters in an RSSI range model according to the actual distance and an attenuation value; a moving target receiving the signals sent by the beacon nodes, selecting four beacons with the largest RSSI value to participate in the positioning calculation, and utilizing the corrected RSSI range model to calculate the distance between the moving target and the four beacon nodes; preliminarily determining the prediction location of the moving target according to the coordinates of the four beacon nodes and the calculated distance; establishing a system of nonlinear equations according to the distances between the coordinates of the four beacon nodes and the moving target, taking the calculated distance and the prediction location as an unknown initial value of the system of nonlinear equations, and utilizing a Newton iterative method to find the optimal solution to obtain the location position of the moving target.

Description

technical field [0001] The invention relates to the technical field of precise indoor moving target positioning, in particular to an RSSI-based indoor moving target positioning method. Background technique [0002] Accurate indoor target positioning is of great significance for commercial applications, public safety, and military applications. However, there are many constraints in the indoor positioning environment, such as many obstacles and interference sources, which make the positioning system modeling difficult, universal and time-effective. poor. Currently existing solutions based on specific equipment, such as the Active Badge system designed by the Olivetti Research Laboratory of the University of Cambridge, the Cricket system launched by the MIT Computer Laboratory, and the LANDMARC system launched by the Hong Kong University of Science and Technology, are expensive and hardware-intensive in practice. The limitations of defects such as complex deployment and limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/10G01S5/14G01S5/02
CPCG01S5/10G01S5/0273G01S5/14
Inventor 石琴琴徐强张建平周俊杰王颖忠
Owner SHANGHAI INST OF TECH
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