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A Precise Target Location Method Based on Channel State Information

A technology for channel state information and target positioning, applied in the field of precise target positioning, can solve problems such as insufficient positioning accuracy, and achieve the effect of overcoming the multipath effect of the wireless environment

Active Publication Date: 2019-10-29
江苏先安科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem of insufficient positioning accuracy based on ranging, a new idea of ​​precise target positioning based on channel state information is provided.

Method used

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  • A Precise Target Location Method Based on Channel State Information
  • A Precise Target Location Method Based on Channel State Information
  • A Precise Target Location Method Based on Channel State Information

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like figure 1 As shown, a precise target positioning method based on channel state information disclosed in an embodiment of the present invention mainly includes the following steps:

[0031] Step 1. Collect channel state information of the wireless target. The node to be positioned sends a data packet to the receiving node, and the wireless network card performs channel estimation on the wireless channel to obtain a channel gain matrix. Suppose the channel gain information from the node to be positioned to the receiving node is CSI i，j , i is the antenna position number of the receiving node, and j is the subcarrier number of the point to be positioned. In one positioning calculation cycle, the node to be positioned can send multiple data packets to the receiving node.

[0032] Step 2. Filter the channel gain information whose ampl...

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Abstract

The invention provides an accurate target positioning method based on channel state information. According to the method of the invention, channel state information (CSI in short) of a wireless target and a multi-antenna channel gain matrix are acquired. Firstly the channel state information with amplitude lower than a threshold is filtered. Then discontinuous subcarriers are reconstructed for adjusting the phase of the subcarrier to a continuous condition. Then spectral peak analysis is performed on a spatial array signal by means of orthogonality between a signal subspace and a noise subspace, thereby obtaining an angle peak value and an arrival time of the signal. Finally a support vector machine is utilized for classifying the peak values, thereby determining a direct arrival angle from many decisions. For aiming at a defect in processing a multipath problem of a wireless signal, the accurate target positioning method effectively overcomes an influence of a wireless environment multipath effect and provides a new conception based on channel state information positioning.

Description

technical field [0001] The invention relates to a precise target positioning technology based on channel state information, and belongs to the technical field of wireless communication and positioning. Background technique [0002] Using wireless technology to achieve positioning has become a development trend in the field of positioning research. Each wireless technology has its own advantages, disadvantages, and application limitations. Factors such as system cost, positioning accuracy, real-time requirements, technical implementation difficulty, and algorithm complexity need to be considered according to specific application scenarios. At present, there are several wireless positioning technologies that are relatively concentrated. Outdoor positioning includes the use of GPS and GSM wireless technologies, and indoor positioning mainly uses various wireless sensors, including infrared, ultrasonic, Bluetooth, Wi-Fi, ZigBee and RFID. [0003] The wireless target positioning...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00H04B7/06H04L5/00
CPCH04B7/0626H04B7/0634H04L5/001H04L5/0023H04W64/006
Inventor 胡爱群姜禹段然庄昱垚赵统一
Owner 江苏先安科技有限公司
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