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Ultrasonic ranging method and ranging device with high anti-interference performance

A technology with high anti-interference and ranging method, which is applied in the field of ultrasonic sensing, can solve problems such as ranging failure, crosstalk between groups, interference, etc., and achieve the effect of accurate results, good anti-noise interference, and guaranteed frequency resolution

Inactive Publication Date: 2014-07-23
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional ultrasonic ranging systems are susceptible to external noise and sound waves, especially when multiple groups of ultrasonic transducers work in parallel, crosstalk between groups is prone to occur, resulting in ranging failure

Method used

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  • Ultrasonic ranging method and ranging device with high anti-interference performance
  • Ultrasonic ranging method and ranging device with high anti-interference performance
  • Ultrasonic ranging method and ranging device with high anti-interference performance

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Experimental program
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Effect test

Embodiment 1

[0047] The invention discloses an ultrasonic ranging method with high anti-interference performance, such as figure 1 shown, including the following steps:

[0048] 1) First, use the first pseudo code from the DSP module to frequency modulate the sine wave signal generated by the sine wave generator to generate a code frequency modulated sine wave; then, perform voltage amplification on the frequency modulated sine wave; finally, send The ultrasonic transducer at the end sends out the sine wave after voltage amplification, generates ultrasonic waves, and starts timing;

[0049] The first pseudocode from the DSP module is used to carry out frequency modulation on the sine wave signal produced by the sine wave generator to generate the sine wave after the pseudocode frequency modulation, specifically comprising:

[0050] 1.1, generate the first pseudo-code m whose length is l by the pseudo-code generation module in the DSP module 1 , and the minimum hold time of each bit in th...

Embodiment 2

[0067] Such as image 3 , 4 , 5, the present invention also discloses a high anti-interference ultrasonic ranging device, including a DSP module, an ultrasonic transmitting module, an ultrasonic receiving module, a display module, and a power supply module;

[0068] Wherein, the ultrasonic transmitting module is used to frequency modulate the sine wave signal generated by the sine wave generator with the first pseudo code from the DSP module to generate a frequency modulated sine wave; then, perform voltage modulation on the sine wave after the frequency modulation of the pseudo code Amplification; finally, the sine wave after voltage amplification is sent out by the ultrasonic transducer at the sending end to generate ultrasonic waves;

[0069] The ultrasonic transmitting module is used to receive the reflected ultrasonic echo, and divide the ultrasonic echo into two ultrasonic echoes after direct isolation and amplification, one ultrasonic echo is filtered, and the other ul...

Embodiment 3

[0080] The ultrasonic transducers in the ultrasonic transmitting and receiving modules are respectively selected from piezoelectric ultrasonic sensors TCT40-16T and TCT40-16R, the center frequency of the two is 40.0±1.0kHz, the sound pressure is ≥114db, the sensitivity is ≤-68db, and the beam angle is 60°. Capacitance 2500pF, working temperature -20~70℃. The two modules are arranged side by side at the same end of the distance measuring device.

[0081] The ultrasonic transmitter module realizes 15Vp-p pseudo-code frequency modulation sine wave ultrasonic output. Given that the transducer center frequency is approximately 40kHz, choose f 1 =42kHz and f 2 =38kHz is the modulation frequency of the emitted sound wave. The sine wave generator selects the single-chip integrated function generator XR2206, which can generate high-stability and high-precision frequency-modulated sine wave signals under the control of the pseudo-code code bits output by the DSP. The voltage amplifi...

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Abstract

The invention provides an ultrasonic ranging method and ranging device with high anti-interference performance. Frequency modulation is conducted on a sine wave signal generated by a sine-wave generator through a pseudo code, and transmitting ultrasonic wave is generated and transmitted; echo frequency discrimination demodulation is conducted on the ultrasonic wave echo, so that echo identification is achieved, and the detection is more accurate; moreover, the pseudo code has a good self-correlation characteristic and a good cross-correlation characteristic, and when the pseudo code is applied to the spread spectrum communication, good noise interference-resistant performance and good mutual crosstalk-resistant performance are represented, so that the problem of mutual crosstalk of the ultrasonic wave is solved and the result is accurate; furthermore, the FFT technology is adopted, so that the received wave can be accurately modulated through a few sampling data, frequency resolution is guaranteed, data collecting time of the received wave is shortened, real-time work of the ranging device is greatly improved, and an efficient solution for accurate and rapid ranging and positioning is provided for an autonomous mobile robot.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic sensing, and in particular relates to a distance measurement method and a corresponding device of an ultrasonic sensor with high anti-interference performance. Background technique [0002] The working principle of ultrasonic sensor ranging is simple, and it is not disturbed by ambient light, so it is often selected as a ranging sensor for mobile robots. However, conventional ultrasonic ranging systems are susceptible to external noise and sound waves, especially when multiple groups of ultrasonic transducers work in parallel, crosstalk between groups is prone to occur, resulting in ranging failure. Therefore, for noise interference and intergroup crosstalk, it is of practical application value to develop an ultrasonic ranging method and device with high anti-interference performance. In this regard, the present invention provides an ultrasonic distance measuring method and distance measuring ...

Claims

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Application Information

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IPC IPC(8): G01S15/08G01S7/537
CPCG01S15/325
Inventor 宋青松田正鑫孙旺旺安毅生赵祥模
Owner CHANGAN UNIV
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