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Frequency-scanning signal time-frequency correlation detection and time delay estimating method

A time delay estimation and frequency sweeping signal technology, applied in seismic signal processing, radio wave measurement systems, instruments, etc., can solve problems such as inability to adapt to detection work, sensitivity to echo waveform distortion, and weak ability to suppress environmental noise

Inactive Publication Date: 2006-08-09
NANJING UNIV
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Problems solved by technology

[0004] Traditional frequency sweep signal detection and delay estimation methods include time-domain cross-correlation, generalized cross-correlation (GCC), deconvolution and other methods, but these methods are not strong in suppressing environmental noise and are sensitive to echo waveform distortion. Therefore, it cannot adapt to the detection work in a strong noise environment

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  • Frequency-scanning signal time-frequency correlation detection and time delay estimating method
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[0039] A time-frequency cross-correlation detection and time delay estimation method of frequency sweep signal according to the present invention is characterized in that it comprises the following steps:

[0040] ① Perform wavelet transform on the frequency sweep source signal to obtain its time-frequency representation;

[0041] ② Perform wavelet transform on the received signal to obtain its time-frequency representation;

[0042] ③ Carry out time-frequency cross-correlation with the time-frequency representation of the source signal and the received signal, and detect and estimate the time delay of the echo in the received signal.

[0043] The invention performs time-frequency cross-correlation on the time-frequency representation of the frequency sweeping source signal and the time-frequency representation of the receiving signal to obtain detection pulses, and calculates the distance of its corresponding target according to the position of each detection pulse.

[0044]...

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Abstract

The method includes following steps: first, carrying out wavelet transform for source signal in frequency sweep so as to obtain its expression in time frequency; carrying out wavelet transform for received signal so as to obtain its expression in time frequency; then, carrying out cross correlation between their expressions in time frequency; carrying out detection and time delay estimation for echo in the received signal so as to obtain detected pulses; calculating distance of corresponding target based on each position of detected pulse. Possessing high capability for suppressing noise, and for adapting waveform distortion in echo, the invention can detect econ in weak energy. The invention is especially suitable to echo detection in condition of large environmental noise, long propagation distance and high attenuation of energy.

Description

1. Technical field [0001] The invention belongs to a reflection detection signal processing method, in particular to a method for detecting frequency-sweeping signals from environmental noise and estimating its time delay. 2. Background technology [0002] At present, frequency sweep signals are widely used in the field of reflection detection, such as vibrator, radar, sonar and ultrasonic non-destructive testing. It is used as a source signal to transmit to the detected medium, then propagates in the medium, and forms a reflected echo after encountering different targets, and then is received by the detector, and the received signal contains multiple frequency sweep signals with different time delays echo. In the signal processing of reflection detection, in order to estimate the distance of each target, it is necessary to detect each echo and estimate its time delay. [0003] Since engineering detection is often carried out in strong noise environments such as mines, hig...

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Application Information

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IPC IPC(8): G01V1/28G01S7/32G01S7/486G01S7/539
Inventor 蒋忠进邱小军
Owner NANJING UNIV
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