Recognition method of submerged plants based on longitudinal wave sound velocity with ultrasonic sensor
A submerged plant and identification method technology, applied in the field of ultrasonic sensor submerged plant identification, can solve the problems of high cost, long time required, and high cost of image sonar, and achieve the effects of low cost, short identification time, and online identification.
Active Publication Date: 2021-07-09
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
Mature sonar products on the market are often sonar arrays and image sonar, which are characterized by high frequency, multi-band, high resolution, long detection range, adaptability to complex environments such as deep sea, and high cost
[0003] The cost of image sonar is high and the detection range is long, so it is not suitable for the detection and identification of small lakes and submerged plants
It usually takes a few seconds to perform image recognition after a pair of sonar images are captured. If online recognition is to be realized, it will take a long time
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[0022] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0023] Such as Figure 1 to Figure 3 Shown, a kind of ultrasonic sensor submerged plant identification method based on longitudinal wave sound velocity, comprises the following steps:
[0024] Bandpass filter the original signal;
[0025] Obtain the signal envelope;
[0026] According to the amplitude of the signal envelope, the echo interval is determined by the threshold method;
[0027] Using the threshold method to determine the echo time difference of the plant interface;
[0028] The soil interface echo is identified through the cross-correlation function, and the echo time difference of the soil interface and the actual echo amplitude of the soil interface are obtained;
[0029] Multiple plant thicknesses corresponding to various plants are calculated by using the longitudinal wave sound velocity of various plants and introduci...
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The invention discloses a submerged plant identification method based on a longitudinal wave sound velocity by an ultrasonic sensor, which comprises the following steps: using a threshold method to determine the echo time difference of the plant interface; identifying the soil interface echo through a cross-correlation function to obtain the echo time difference of the soil interface and the actual echo amplitude of the soil interface; using the longitudinal wave sound velocity of a variety of different plants and introducing the echo time difference of the plant interface and the echo time difference of the soil interface to calculate the multiple plant thicknesses corresponding to a variety of different plants; according to multiple The corresponding multiple transmission coefficients are calculated for each plant thickness; the theoretical echo amplitude of the soil interface corresponding to each plant is obtained according to the multiple transmission coefficients and the reflection coefficient of the soil interface backing; the multiple theoretical echo amplitudes are compared with The plant corresponding to the theoretical echo amplitude with the closest actual echo amplitude is the identified plant. The advantage is that the cost is low; it can be suitable for identifying submerged plants in small lakes; it does not need to identify images, and the identification time is short.
Description
technical field [0001] The invention relates to a method for identifying submerged plants by an ultrasonic sensor based on longitudinal wave sound velocity. Background technique [0002] At present, the recognition of submerged plants is mainly to use image sonar to generate sonar images and then perform image recognition. Mature sonar products on the market are often sonar arrays and image sonar, which are characterized by high frequency, multi-band, high resolution, long detection range, adaptability to complex environments such as deep sea, and high cost. [0003] Image sonar is expensive and has a long detection range, so it is not suitable for the detection and identification of small lakes and submerged plants. It usually takes a few seconds to perform image recognition after a pair of sonar images are captured, and it takes a long time to realize online recognition. Contents of the invention [0004] In order to solve the deficiencies of the prior art, the present...
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IPC IPC(8): G01N29/07G01S15/88
CPCG01N29/07G01S15/88
Inventor 赵春宇郑仪
Owner SHANGHAI JIAOTONG UNIV