Passive target positioning method based on multipath signal spatial spectrum

A target positioning and multipath signal technology, applied in the field of positioning, can solve the problems of inaccurate measurement of signal energy and phase offset, achieve high positioning accuracy, eliminate phase difference, and improve positioning accuracy

Active Publication Date: 2017-05-10
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a reader's RF front-end will introduce random phase offsets in phase measurements
[0005] AOA measured by MUSIC In real life, the classic MUSIC algorithm cannot accurately measure the signal energy on each path

Method used

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  • Passive target positioning method based on multipath signal spatial spectrum
  • Passive target positioning method based on multipath signal spatial spectrum
  • Passive target positioning method based on multipath signal spatial spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0070] Such as Figure 4 , in this embodiment, in the environment of library, laboratory and hall, step two readers , first set 4 antennas on the two readers, then set 6 antennas, and finally set 8 antennas. In the case of three different antenna numbers, the same target object (person) is positioned. The result It shows that the median positioning error of 4 antennas is 35.6 cm, the median positioning error of 6 antennas is 21.4 cm, and the median positioning error of 8 antennas is 17.6 cm. Therefore, a reasonable increase in the number of antennas can increase the positioning accuracy.

Embodiment 3

[0072] Such as Figure 5 , in the library environment, we gradually increase the number of tags from 7 to 47 to 5, the number of tags and the number of reflectors will increase the multipath in the environment, the result is shown in the figure, the tag The increase of the number can reduce the positioning error value. Therefore, in an indoor environment with many reflectors, the density of tags can be reduced to achieve similar positioning accuracy.

Embodiment 5

[0074] Such as Figure 6 , Let a person use his fist to write the letter "P" and the letter "O" along the marked track on the 2m×2m desktop. The experimental results are as follows Figure 7 shown, from Figure 7 It can be seen that the average positioning errors for 26 and 13 tags are 5.8 cm and 9.7 cm respectively.

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Abstract

The invention discloses a passive target positioning method based on a multipath signal spatial spectrum, and the method comprises the steps: setting a reader and tags, measuring the phase and amplitude between each tag and the reader A in a monitoring range, and enabling the phase and amplitude values to serve as the reference data; randomly setting a target in the monitoring range, measuring the phase and amplitude between each tag and the reader, and enabling the phase and amplitude values to serve as comparison data; removing the phase difference of the phase values in the reference data and the comparison data, carrying out the processing of the obtained corrected comparison data and reference data, generating two groups of AOA spectrums, comparing the peaks of all paths in the two groups of AOA spectrums, finding a direction angle, obtaining the range of a target object through the direction angle and the reader, and obtaining the position of the target object through a likelihood function. The method provide by the invention does not need any training mode, and is high in positioning precision.

Description

technical field [0001] The invention relates to the technical field of positioning, in particular to a passive target positioning method based on multipath signal space spectrum. Background technique [0002] In recent years, passive positioning technology in which the target does not need to carry any device has played an increasingly important role in intrusion monitoring, elderly monitoring and emergency rescue. However, most positioning technologies believe that multipath is an unfavorable factor, which results in low positioning accuracy and limited range. [0003] RFID system: RFID systems usually consist of a reader and many antennas. The antennas have no internal batteries, so they can only obtain energy from the signal sent by the reader and reflect the signal to the reader. Typically, a COTS reader reduces deployment costs by connecting many antennas to increase coverage. There are two aspects in the RFID system that are closely related to the passive positioning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/12
CPCG01S5/12
Inventor 陈晓江冯超王举房鼎益
Owner NORTHWEST UNIV(CN)
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