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Method and apparatus for three-dimensional multi-movement objective positioning by using multi-frequency sound wave

A multi-moving target and sound wave technology, applied in positioning, measuring devices, radio wave measuring systems, etc., can solve problems such as difficult detection and no positioning found

Inactive Publication Date: 2009-01-14
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the high frequency of electromagnetic waves, for small-scale low-speed moving targets, the Doppler relative frequency shift is very small, which is difficult to detect. Therefore, there is no use of electromagnetic wave Doppler frequency shift to make small-scale moving targets. position

Method used

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  • Method and apparatus for three-dimensional multi-movement objective positioning by using multi-frequency sound wave
  • Method and apparatus for three-dimensional multi-movement objective positioning by using multi-frequency sound wave
  • Method and apparatus for three-dimensional multi-movement objective positioning by using multi-frequency sound wave

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Embodiment Construction

[0032] like figure 1 As shown, the device of the present invention includes a control unit and a sensor unit. The control unit includes a digital signal processor, a modem, an oscillator, several frequency dividers and an analog-to-digital converter (A / D). The oscillator uses a 20M crystal oscillator, the frequency divider is implemented with a phase-locked loop circuit, the modulator and demodulator are implemented with a multiplication circuit, and the analog-to-digital converter and digital signal processor are implemented with a TI DSP chip TMS 320C2812. The sensor unit includes a certain number of target devices and several receiving sensors (planar positioning: install at least 3 sensors that are not in the same straight line; three-dimensional positioning: install at least 4 sensors that are not in the same plane). The switching function sensor of the target device uses a piezoelectric sensor, and the target transmitting and receiving sensors both use ultrasonic transdu...

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Abstract

The invention discloses a three-dimensional multiple moving objects locating method and a corresponding apparatus which make use of multi-frequency sound waves. The method figures out the distances between an objective point and each receiving point according to the dynamic Doppler frequency deviation and phase differences of a measurement signal sent by the objective point and a measurement signal received by the receiving point and then gets a three-dimensional coordinate of the objective point in a referential coordinate system through a three-dimensional space geometric computation. The apparatus comprises a control unit and an objective sensor unit which are mutually connected with or without wire; wherein, the control unit comprises a digital signal processor, a modem, an oscillator, a multi-channel AD converter and a plurality of frequency dividers; the objective sensor unit comprises a plurality of objective apparatuses and a plurality of receiving sensors; the objective apparatus consists of a sensor provided with an on-off function and a transmission energy convertor; the oscillator is connected with a plurality frequency dividers. The invention has high locating accuracy for three-dimensional moving objects and high anti-interruption capability, and the structure of the apparatus is simple and the arrangement and use are convenient. The invention is applicable to various locating sites.

Description

technical field [0001] The present invention relates to sound wave measurement technology, in particular to a control method and device for locating three-dimensional multi-moving targets in a designated area by using multi-frequency sound waves to construct measurement signals, and using the dynamic Doppler frequency shift and phase difference of the measurement signals. Background technique [0002] At present, the general planar small-scale positioning systems, such as electronic whiteboards, touch screens, handwriting boards, etc., mainly use optical technology, acoustic surface technology and electromagnetic induction technology. The advantage of this type of positioning system is accurate positioning, but the equipment cost is relatively high, and it is mainly suitable for locating points on a two-dimensional plane. The location of three-dimensional space points is generally estimated by the time difference of arrival of ultrasonic or other signals (ZL01144415.0). This...

Claims

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Application Information

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IPC IPC(8): G01S5/18
Inventor 韦岗宁更新
Owner SOUTH CHINA UNIV OF TECH
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