A method of ultrasonic distance measurement
A ranging method and ultrasonic technology, applied in the re-radiation of sound waves, radio wave measurement systems, measurement devices, etc., can solve the problems of ultrasonic crosstalk, difficult to set the threshold value of the first wave of the detection echo signal, etc., and achieve the goal of suppressing ultrasonic crosstalk. Effect
Inactive Publication Date: 2019-12-06
NO 63655 TROOPS OF THE CHINESE PEOPLES LIBERATION ARMY
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[0029] The technical problem to be solved by the present invention is to provide an ultrasonic ranging method, which solves the problems of difficult setting of the first wave threshold of the detection echo signal and ultrasonic crosstalk
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[0047] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0048] see figure 1 , an ultrasonic distance measuring method, the method comprises: at the ultrasonic transmitting end, the pulse signal is encoded, and the signal obtained after the encoding is used to modulate the carrier wave, and the modulated pulse excitation sequence is used to excite the ultrasonic sensor; the emitted signal After propagating in the air and reflecting after encountering obstacles, the echo signal enters the ultrasonic receiving end; at the receiving end, the echo signal is used to perform correlation calculations with the pre-stored reference signal, and the reference signal is continuously delayed ...
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The invention belongs to the ultrasonic wave ranging field and especially relates to an ultrasonic wave ranging method. The method comprises the following steps that on an ultrasonic wave transmitting terminal, a pulse signal is coded, a coded signal is used to modulate a carrier wave, and a modulated pulse excitation sequence to excite an ultrasonic wave sensor; an emitted signal is spread in air and is reflected after encountering a barrier, and an echo signal enters into an ultrasonic wave receiving end; and on the receiving end, the echo signal and a reference signal which is stored in advance are used to carry out correlation operation, time delay is continuously performed on the reference signal so as to acquire a cross-correlation function peak value and then acquire transit time, and then a distance is acquired. In the method, under the condition that a signal to noise ratio is small, the transit time can be still accurately estimated so that a problem that a first wave of threshold of a detection echo signal is difficult to set is solved; and a crosstalk problem generated when ranging is performed on a plurality of ultrasonic waves simultaneously can be solved too.
Description
technical field [0001] The field of ultrasonic distance measurement of the present invention is specifically an ultrasonic distance measurement method. Background technique [0002] According to the human ear's ability to distinguish sound, sound waves can be divided into infrasonic waves, sound waves, and ultrasonic waves according to frequency differences. According to the vibration theory, it can be defined that ultrasound is an elastic vibration with a frequency higher than 20KHz, which belongs to the category of mechanical waves. [0003] In the field of ultrasonic testing, ultrasonic waves can be divided into longitudinal waves, transverse waves, surface waves and Lamb waves, which are divided according to the different directions of ultrasonic propagation and vibration [38]. Since ultrasonic ranging is mainly carried out in the air medium, the air medium cannot transmit transverse shear stress, so most of the waves used in ultrasonic ranging systems are longitudinal ...
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IPC IPC(8): G01S15/08
CPCG01S15/08
Inventor 訾彦勇谢永杰朱建辉张轶戚祖敏王泽华周晓凤郭睿
Owner NO 63655 TROOPS OF THE CHINESE PEOPLES LIBERATION ARMY