Electronic whiteboard experiment system and positioning method based on infrared and ultrasonic joint positioning

An electronic whiteboard and joint positioning technology, applied in the direction of electronic digital data processing, data processing input/output process, instruments, etc., can solve the problems of reduced positioning accuracy, positioning failure, data error, etc., to achieve volume reduction, timely and accurate The effect of acquisition and low cost

Active Publication Date: 2013-11-27
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to various disturbances in the environment, the actual measured data often contain errors, resulting in red

Method used

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  • Electronic whiteboard experiment system and positioning method based on infrared and ultrasonic joint positioning
  • Electronic whiteboard experiment system and positioning method based on infrared and ultrasonic joint positioning
  • Electronic whiteboard experiment system and positioning method based on infrared and ultrasonic joint positioning

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Experimental program
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Embodiment Construction

[0023] The following is a further description of this experimental system in conjunction with the attached drawings:

[0024] Such as figure 1 , figure 2 As shown, the hardware structure of the present invention is relatively simple, low in cost, and easy to implement.

[0025] In order to reduce the volume of the signal transmitter, the microcontroller that controls the pulse waveform in this experimental system is the smaller 8-bit 8-pin microcontroller PIC12F629 from Microchip. The waveform circuit is mainly generated by the GP0 port and GP1 port of the single-chip microcomputer. Because the resonant circuit in the drive circuit resonates the 80KHZ frequency component contained in the pulse, the pulse width is directly related to the power of each frequency component contained in the pulse, and the pulse is more The higher the power, the shorter the battery life; the pulse width is too narrow, and the 80KHZ signal energy contained in the pulse is small, resulting in insufficien...

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Abstract

The invention discloses an electronic whiteboard experiment system and a positioning method based on infrared and ultrasonic joint positioning, and belongs to the field of wireless positioning. The experiment system mainly comprises a signal transmitting module, a signal receiving module, a signal processing module and an upper computer, the signal transmitting module integrates an infrared transmitter and an ultrasonic transmitter, and the signal receiving module integrates an infrared receiver and six ultrasonic receivers. A signal pen can generate periodic infrared and ultrasonic signals, the infrared receiver at a receiving end detects the infrared signals, the six ultrasonic receivers simultaneously start working, respectively detect respective time consumed for receiving the ultrasonic signals and transmit the signals to the signal processing module, and data corrected by a BP (back propagation) neural network are solved by the aid of a Chan algorithm to obtain a signal source. The cost of a sensor is greatly saved, the experiment system is small in size, detection data of the sensor can be timely and accurately acquired, the experiment system can serve as an experiment platform for a high-precision algorithm, and facilitating conditions are provided for research on algorithm effectiveness and the like.

Description

Technical field [0001] The invention is an electronic whiteboard experimental system and a positioning method based on infrared ultrasonic joint positioning, and belongs to the field of wireless positioning. Background technique [0002] The electronic whiteboard is a dry-wiping whiteboard that can be written on the board and can be electronically captured. It integrates a blackboard, multimedia, and a projector. Its functions are far greater than the sum of the three. It is an internationally launched one in recent years. A high-tech product. The electronic whiteboard is a breakthrough in traditional blackboard writing and multimedia classrooms. It can be used online with projectors, computers, etc., using the computer's data processing functions and information transmission functions to easily realize information presentation, editing and other functions. The electronic whiteboard teaching platform compares the two teaching methods of the blackboard and the audio-visual platfo...

Claims

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Application Information

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IPC IPC(8): G06F3/042G06F3/043
Inventor 于建均张英坤阮晓钢于乃功孙永芳韩春晓刘涛
Owner BEIJING UNIV OF TECH
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