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Ultrasonic distance sensor capable of preventing sound interference and range finding method thereof

A technology of distance sensor and distance measurement method, which is applied in the direction of sound wave reradiation, radio wave measurement system, instrument, etc., which can solve the problems of poor anti-interference performance of ultrasonic sensors and achieve the effect of suppressing interference

Active Publication Date: 2016-10-26
南京奇蛙智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide an ultrasonic distance sensor capable of resisting acoustic interference and a distance measuring method thereof, so as to solve the technical problem of poor anti-interference performance of the ultrasonic sensor in the prior art

Method used

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  • Ultrasonic distance sensor capable of preventing sound interference and range finding method thereof
  • Ultrasonic distance sensor capable of preventing sound interference and range finding method thereof
  • Ultrasonic distance sensor capable of preventing sound interference and range finding method thereof

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Embodiment 1

[0034] An ultrasonic distance sensor that is immune to acoustic interference, comprising:

[0035] Ultrasonic transmitting end, used for transmitting ultrasonic serial signals;

[0036] Ultrasonic receiving end, used for receiving the echo signal;

[0037] The microprocessor is used for comparing and matching the ultrasonic sequence signal with the echo signal, and calculating the distance from the ultrasonic distance sensor to the obstacle.

[0038] By setting the microprocessor, the interference of other ultrasonic sensors or / and environmental noise on the ultrasonic sensor can be effectively eliminated, and the position of the obstacle can be accurately determined.

Embodiment 2

[0040] Such as figure 1 Shown, a kind of distance measuring method of the ultrasonic distance sensor that can prevent sound interference, comprises the following steps:

[0041] The first step: turn on the ultrasonic distance sensor, and the microprocessor uses the chaotic map to generate a pseudo-random number sequence C(n) composed of 0 and 1; the pseudo-random number sequence C(n) is only generated once when the ultrasonic distance sensor is turned on, The length of the pseudo-random number sequence C(n) is a pre-value, which can be determined according to the measurement distance requirements, and each pseudo-random number sequence is randomly generated, so that the pseudo-random number sequences generated by different ultrasonic distance sensors are also different;

[0042] The second step: according to the number of pulse cycles corresponding to the code elements "0" and "1", map the pseudo-random number sequence C(n) to the corresponding pulse sequence A(t); the code el...

Embodiment 3

[0055] In this embodiment, C(n) is 010110, the threshold f is 1, and the corresponding emission pulse sequence A(t) is figure 2 As shown, the reference sequence R(u) is 1110011010, and the echo comparison sequence Rb(u) of a certain update is 000111001, and the matching is unsuccessful, such as image 3 As shown; after receiving the echo signal for m times and the matching is unsuccessful, after receiving the echo signal for the m+1th time, the updated echo comparison sequence Rb(u) is 1110011010, and the matching is successful, such as Figure 4 As shown, it can be concluded that m in this embodiment is a positive integer greater than or equal to 2.

[0056] In other embodiments, the threshold f may be 0.8, 0.85, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.97, 0.98, or 0.99.

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Abstract

The invention discloses an ultrasonic distance sensor capable of preventing sound interference and a range finding method thereof. The ultrasonic distance sensor includes an ultrasonic transmitter, an ultrasonic receiver for receiving echo signals and a microprocessor, The range finding method includes the steps of (1) generating a pseudo-random sequence C (n) composed of 0 and 1 through chaotic mapping by means of the microprocessor; (2) generating the pseudo-random sequence C (n) as the corresponding pulse sequence A (t) according to the number of pulse periods corresponding to the code elements '0' and '1'; and (3) taking out the points satisfying t=(Tc*kc)*i in the pulse sequence A (t), combining into a reference sequence R(u) based on the take-out sequence, and meanwhile, setting the sequence being equal to R(u) in length and all being zero into an echo comparison sequence Rb(u). The ultrasonic wave can effectively suppress the interference of other ultrasonic sensors and / or environmental noise and other privacy to the ultrasonic sensor by setting the microprocessor and the corresponding measuring method, so that the position of the obstacle can be accurately determined.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic sensors, and in particular relates to an ultrasonic distance sensor capable of resisting acoustic interference and a distance measuring method thereof. Background technique [0002] Ultrasound has a very wide range of applications in ranging and detection. The use of ultrasound as a positioning technology is also a means for some creatures without visual ability, such as bats, to defend and capture prey. Ultrasonic waves (mechanical waves above 20KHz), by means of air medium propagation, are reflected by the prey or obstacles to be captured. [0003] Humans have widely used ultrasonic technology in civil and national defense industries. UAVs also generally use ultrasonic sensors to perceive environmental information. In order to obtain environmental information within a 360° circumferential range, it is usually necessary to install multiple such sensors on the UAV. For ultrasonic sensors, the ...

Claims

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Application Information

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IPC IPC(8): G01S15/08G01S7/537
CPCG01S7/537G01S15/08
Inventor 刘磊郭力高月山段文博张伟
Owner 南京奇蛙智能科技有限公司
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