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A method of ultrasonic distance measurement

A distance measurement method, ultrasonic technology, applied in the direction of sound wave re-radiation, radio wave measurement system, measurement device, etc., can solve the problem of low frequency of distance measurement of unmanned aerial vehicles, to meet the requirements of distance measurement, increase frequency, increase speed and the effect of precision

Active Publication Date: 2017-07-28
广州快飞计算机科技有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to propose a method of ultrasonic ranging, which can solve the problem of low frequency of ranging for unmanned aerial vehicles

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  • A method of ultrasonic distance measurement
  • A method of ultrasonic distance measurement
  • A method of ultrasonic distance measurement

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Embodiment Construction

[0024] In the following, the present invention will be further described in conjunction with the drawings and specific embodiments.

[0025] like figure 2 Shown, a kind of ultrasonic ranging method, it is applied in the signal control processing module of unmanned aerial vehicle, and described unmanned aerial vehicle is equipped with ultrasonic transmitting head and ultrasonic receiving head, and ultrasonic emitting head and ultrasonic receiving head are all connected with signal control processing module connection. The signal control processing module has timers, MCU, ADC and other electronic devices.

[0026] The ultrasonic ranging method of the present embodiment specifically includes the following steps:

[0027] Step S1. After the unmanned aerial vehicle takes off, use the traditional ultrasonic ranging method to preliminarily determine the flying height. Turn on the ultrasonic receiving head, the ultrasonic emitting head sends an ultrasonic pulse to the ground, afte...

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Abstract

The invention relates to an ultrasonic ranging method, which comprises the following steps that an ultrasonic transmitting head transmits n ultrasonic pulses to the ground at a preset time interval T1 in sequence, and the frequencies of the n ultrasonic pulses are increased or decreased in sequence according to a preset frequency step; an ultrasonic receiving head receives the n ultrasonic pulses reflected from the ground, when one ultrasonic pulse is received at each time, a corresponding ranging time deltaTn is computed according to a formula I, the formula I is deltaTn=Trn-Ttn, wherein the Ttn is a moment for the ultrasonic transmitting head to transmit the nth ultrasonic pulse, and the Trn is a moment for the ultrasonic receiving head to receive the nth ultrasonic pulse; when the corresponding ranging time deltaTn is obtained at each time, a current distance dn between an unmanned aerial vehicle and the ground is computed. According to the ultrasonic ranging method, the speed and the precision for ultrasonic ranging can be improved, and the ranging requirements of the unmanned aerial vehicle in a flight process are met.

Description

technical field [0001] The invention relates to the ranging technology of an unmanned aerial vehicle. Background technique [0002] With the development of science and technology, agricultural technology is also gradually tending to automation. At present, unmanned aerial vehicles can be used to sow large tracts of farmland within a predetermined height. Unmanned aerial vehicles generally use ultrasonic ranging technology to judge their flight altitude from the ground. Ultrasonic distance sensors have great advantages in terms of cost, accuracy, reliability, and directivity. The principle of ultrasonic distance measurement is to use the known propagation speed of ultrasonic waves in the air to measure the time it takes for the sound waves to encounter obstacles and reflect back after they are emitted, and to calculate the actual distance from the emission point to the obstacle based on the time difference between emission and reception. It can be seen that the principle o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/08G01S15/12
CPCG01S15/08G01S15/12
Inventor 黄耀霖丁胜东彭斌
Owner 广州快飞计算机科技有限公司
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