Ranging method, system and medium based on chirp ultrasonic wave

Abstract

The invention discloses a distance measuring method, system and medium based on linear frequency modulated ultrasonic waves, comprising the following steps: regularly transmitting a first linear frequency modulated ultrasonic signal, and synchronously converting the first linear frequency modulated ultrasonic signal into a first pulse signal; saving the first linear frequency modulated ultrasonic signal The pulse width of the first target level in a pulse signal, and save the time of the rising or falling edge of the first target level; receive the second chirp ultrasonic signal, and convert the second chirp ultrasonic signal into the second pulse signal; Obtain the pulse width of the second target level in the second pulse signal, if there is a first target level with the same pulse width as the second target level, according to the first target level and the second target level with the same pulse width The time of the corresponding rising edge or falling edge is used to calculate the time of flight, and then the current distance is calculated according to the time of flight and the speed of sound at the current temperature. The invention overcomes the disadvantage of low measurement accuracy in the prior art and reduces the computational complexity.

Description

technical field

[0001] The invention relates to the field of ultrasonic distance measurement, in particular to a distance measurement method, system and medium based on chirp ultrasonic waves. Background technique

[0002] 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. At present, there are several methods of using ultrasonic ranging:

[0003] 1. After sending out several ultrasonic pulses, wait and accept these pulses, then calculate the time difference between ultrasonic emission and reception, and then calculate the distance of the measured object according to the known sound velocity. This method generally uses ultrasonic pulses with a fixed frequency, a...

Examples

Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0037] At present, there are quite a few ultrasonic ranging scenarios where the distance between the measured object is relatively close and the measurement results require high precision. For example, in order to understand the aging of rubber, it is necessary to accurately measure the distance change between the upper and lower partitions. The distance between the upper and lower plates of the vibrator shall not exceed 50cm. Aiming at the defects existing in the current ultrasonic ranging method, this embodiment proposes a ranging method based on chirped ultrasonic waves, such as figure 1 shown, including the following steps:

[0038] S1) generating a continuous chirp ultrasonic signal as a first chirp ultrasonic signal, regularly transmitting the first chirp...

technical field

[0001] The invention relates to the field of ultrasonic distance measurement, in particular to a distance measurement method, system and medium based on chirp ultrasonic waves. Background technique

[0002] 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. At present, there are several methods of using ultrasonic ranging:

[0003] 1. After sending out several ultrasonic pulses, wait and accept these pulses, then calculate the time difference between ultrasonic emission and reception, and then calculate the distance of the measured object according to the known sound velocity. This method generally uses ultrasonic pulses with a fixed frequency, a...

Examples

Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0037] At present, there are quite a few ultrasonic ranging scenarios where the distance between the measured object is relatively close and the measurement results require high precision. For example, in order to understand the aging of rubber, it is necessary to accurately measure the distance change between the upper and lower partitions. The distance between the upper and lower plates of the vibrator shall not exceed 50cm. Aiming at the defects existing in the current ultrasonic ranging method, this embodiment proposes a ranging method based on chirped ultrasonic waves, such as figure 1 shown, including the following steps:

[0038] S1) generating a continuous chirp ultrasonic signal as a first chirp ultrasonic signal, regularly transmitting the first chirp...

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