Method, apparatus and device for echo delay determination of chirp acoustic signals

By using a method for determining the echo delay of linear frequency modulated sound signals and employing techniques such as time-varying bandpass filtering and short-time Fourier transform, the problem of echo signals being susceptible to interference is solved, and high-precision calculation of echo delay is achieved, making it suitable for target detection in complex environments.

CN121276527BActive Publication Date: 2026-05-19CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Application Number
CN202511613159.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-11-06
Publication Date
2026-05-19
Estimated Expiration
2045-11-06

AI Technical Summary

Technical Problem

In existing technologies, echo signals are easily interfered with, resulting in low accuracy in echo delay calculation. This is especially true in long-distance measurements and complex environments, where noise and clutter interference severely affect the accurate identification of echo signals.

Method used

A method for determining the echo delay of a linear frequency modulated (LFM) acoustic signal is adopted. Through time-varying bandpass filtering, short-time Fourier transform, logarithmic time-spectrum analysis, and signal reconstruction, the initial frequency and delay of the echo signal are determined, thereby reducing the impact of noise and clutter interference.

Benefits of technology

It improves the accuracy of echo delay calculation, enhances anti-interference capability, and ensures the accuracy of echo delay measurement in complex environments.

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Abstract

The embodiment of the application provides a method, device and equipment for determining echo delay of a linear frequency modulation acoustic signal. The method is applied to the field of digital signal processing. Time-varying band-pass filtering is performed on an acquired acoustic signal, the filtered acoustic signal is subjected to short-time Fourier transform and logarithm is taken, and a logarithmic time-frequency spectrum is obtained. Peak information in the logarithmic time-frequency spectrum is extracted, and a frequency modulation line of a linear frequency modulation signal is fitted, and an initial frequency of the linear frequency modulation signal is obtained. The frequency modulation line of the linear frequency modulation signal and the peak information in the logarithmic time-frequency spectrum are used for signal reconstruction, the reconstructed signal is subjected to short-time Fourier transform and logarithm is taken, a reconstructed spectrum is obtained, and a difference spectrum is obtained by subtracting the reconstructed spectrum from the logarithmic time-frequency spectrum. Peak information of the difference spectrum is extracted, a frequency modulation line of an echo signal is fitted, and an initial frequency of the echo signal is obtained. The initial frequency difference between the linear frequency modulation signal and the echo signal is used to determine an echo delay amount. The method has strong anti-interference capability and improves the calculation precision of the echo delay amount.
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