An Ultrasonic Ranging Method in Long-distance Scenarios

Abstract

The invention discloses an ultrasonic ranging method in a long-distance scene. The method includes: generating a measurement signal according to a measurement criterion of compressed sensing, and transmitting it through an ultrasonic transducer at a transmitting end; sampling and summing the received signal at a receiving end. After filtering, the effective signal interception is performed on the filtered sampling signal; the sparse channel signal is recovered from the intercepted effective signal by using the compressed sensing recovery algorithm; the first path signal and the first channel signal are obtained by peak screening from the sparse channel signal. The arrival time of the first path; multiply the arrival time of the first path by the propagation velocity to get the distance from the transmitting end to the receiving end. The method of the invention can measure accurate multi-path channels, realize high-precision distance measurement, and simultaneously ensure measurement stability; can acquire signals at a lower sampling frequency, realize super-resolution of distance measurement, and reduce distance measurement cost.

Description

technical field [0001] The invention relates to the field of ultrasonic positioning, in particular to an ultrasonic ranging method in a long-distance scene. Background technique [0002] In the long-distance ranging of mechanical waves or electromagnetic waves, multipath problems are difficult to avoid; multipath signals will lead to a significant drop in ranging accuracy, especially the impact on ranging stability; increasing bandwidth is the key to suppressing multiple effective approach to the problem. [0003] However, the bandwidth of the ultrasonic transducer is limited, and the multipath problem is particularly prominent; it limits the use of ultrasonic waves in long-distance ranging scenarios; in addition, the high frequency of ultrasonic waves requires a high sampling rate, resulting in high acquisition costs and a large amount of processed data. Increased use cost. [0004] The undersampling feature of compressed sensing can greatly reduce the sampling frequency ...

AI Technical Summary

Problems solved by technology

[0002] In the long-distance ranging of mechanical waves or electromagnetic waves, multipath problems are difficult to avoid; multipath signals will lead to a significant drop in ranging accuracy, especially the impact on ranging stability; increasing bandwidth is the key to suppressing multiple effective means of

[0003] However, the bandwidth of the ultrasonic transducer is limited, and the multipath problem is particularly prominent; it limits the use of ultrasonic waves in long-distance ranging scenarios; in addition, the high frequency of ultrasonic waves requires a high sampling rate, resulting in high acquisition costs and a large amount of processed data. Increased cost of use

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