Chaos pulse sequence ultrasonic distance-measuring method and apparatus

A technology of pulse sequence and distance measurement method, which is applied in the field of distance measurement, can solve the problems of limiting the maximum measurable distance of ultrasonic waves, distance ambiguity, etc., and achieve the effect of eliminating distance ambiguity, eliminating random errors, and large measurable distance

Inactive Publication Date: 2007-01-03
TIANJIN UNIV
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Problems solved by technology

However, the prerequisite for the success of this method is that the transmitted pseudo-random excitation sequence must have very good autocorrelation performance
The pseudo-random sequence is a periodic sequence. If the period of the signal is smaller than the transit time, the distance will be ambiguous, thus limiting the maximum measurable distance of the ultrasonic wave.

Method used

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  • Chaos pulse sequence ultrasonic distance-measuring method and apparatus
  • Chaos pulse sequence ultrasonic distance-measuring method and apparatus
  • Chaos pulse sequence ultrasonic distance-measuring method and apparatus

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Embodiment Construction

[0034] The present invention adopts the chaotic pulse sequence width modulation sequence as the emission sequence of the ultrasonic transducer, and the sequence produced by the chaotic pulse sequence width modulation method has good correlation characteristics (with sharp autocorrelation function and gentle cross-correlation function) to eliminate Crosstalk issues between multiple ultrasound transducers.

[0035] The chaotic impulse sequence has a sharp autocorrelation function, and there is no correlation between sequences from different systems, sequences from the same system but different attractors, or sequences from the same attractor but different parts. Therefore, if the ultrasonic transducer wants to judge whether the received echo is generated by its own transmission sequence, it needs to correlate the received echo with its own transmission sequence. If the value of the correlation function is found to be very flat, it does not reach the set value. threshold, it mean...

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Abstract

A chaos impulse list ultrasonic distance test method and equipment belong to ultrasonic distance test technology field. (1) Create the breadth-modulating list of chaos impulse list. (2) Create and send the ultrasonic by excitation ultrasonic energy-exchanging implement to the breadth-modulating list of chaos impulse list, and save the breadth-modulating list of chaos impulse list. (3) Accept the echo signal of the need test object with the said ultrasonic energy-exchanging implement. (4) Operate the accepted echo signal with the former chaos impulse list to confirm the echo time and the distance to the object. The ultrasonic distance test by this method and implement has strong anti-jamming ability, better real time quality and high precision.

Description

technical field [0001] The invention belongs to the field of distance measurement, and in particular relates to an ultrasonic distance measurement method and a device adopting the method. Background technique [0002] With the development and performance of mobile robots and autonomous vehicles, its application is becoming more and more extensive. Robots are required to have high flexibility, strategy, and good cooperation. If the robot cannot effectively avoid obstacles, the robot's actions will inevitably be limited. Therefore, the problem of robot ranging is very important. [0003] Ultrasonic ranging is not affected by factors such as illumination, electromagnetic field, and color in use, and has the advantages of simple structure, low cost, and easy hardware implementation. It has been used in robot obstacle avoidance and positioning, car reversing, and reservoir liquid level measurement. With a wide range of applications. [0004] Ultrasonic distance measurement usu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/10G01S15/08
Inventor 孟庆浩梁琼姚凤娟
Owner TIANJIN UNIV
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