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A Method for Echo Signal Parameter Estimation in Multi-channel Channel

A technique for echo signal and parameter estimation, applied in radio wave measurement systems, instruments, etc., can solve problems such as accurate estimation of unfavorable target parameters, and achieve the effect of saving computing resources

Active Publication Date: 2020-07-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This conventional matched filter algorithm will appear multiple matching peaks with different amplitudes when detecting multi-channel signals, which will not be conducive to accurate estimation of target parameters

Method used

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  • A Method for Echo Signal Parameter Estimation in Multi-channel Channel
  • A Method for Echo Signal Parameter Estimation in Multi-channel Channel
  • A Method for Echo Signal Parameter Estimation in Multi-channel Channel

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Embodiment Construction

[0036] This embodiment provides a method for estimating echo signal parameters under a multi-channel channel, such as figure 1 shown, including:

[0037] (1) The copy signal in the matched filter is designed as a copy of the transmitted signal compressed by different Doppler factors.

[0038] Among them, the copy signal in the matched filter is designed as:

[0039]

[0040] In the formula, u[η m n] is the transmit signal, T is the signal pulse width, FS is the sampling rate, η m =(c+v m ) / (c-v m ) is the Doppler factor, c is the propagation speed of sound in water, v m is the speed to be verified and v m =v min +m·δ v ,[v min ,v max ] is the radial velocity range of the target to be measured, and the velocity is positive when moving away from each other, δ v is the velocity resolution.

[0041] (2) Match the echo signal and the copy signal under the multi-channel channel in sequence, and find the copy signal corresponding to the maximum output peak value as the...

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Abstract

The invention discloses a method for estimating parameters of echo signals under a multi-channel condition, and the method comprises the steps: (1), designing a copy signal in a matching filter as a transmitted signal copy after the copy signal is compressed through different Doppler factors; (2), sequentially matching the echo signals under the multi-channel condition to be matched with the copysignal to find and output the copy signal corresponding to the maximum peak as a best matching result; (3), estimating parameters and time domain signals in a path according to the best matching result, subtracting the matching results of all path signals estimated previously from the matching results under different Doppler factors in the parameter estimation of a next path, so as to detect the parameters and time domain signals in the remaining paths. The method is more robust, is higher in estimation precision, makes the most of the calculation results, and is suitable for various types ofbroadband signals.

Description

technical field [0001] The invention relates to the field of parameter estimation of underwater acoustic echo, in particular to a method for parameter estimation of echo signals under multi-channel channels. Background technique [0002] The complex time-frequency characteristics of underwater acoustic channels make it one of the most difficult wireless channels for echo signal processing. In the underwater acoustic target channel, the relative motion between the target or the sonar will cause the Doppler effect of the echo signal, and the transmitted signal in most underwater acoustic systems has broadband characteristics, so the Doppler at this time The effect will not be reduced to the shift of the signal frequency, but the compression or broadening of the signal pulse width caused by the Doppler coefficient. [0003] At the same time, since the reflected signals of underwater acoustic targets may have different transmission paths, the received echo is the superposition ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 方世良黄舒夏韩宁
Owner SOUTHEAST UNIV