Method for measuring parameters of hydroacoustic channel, and method for obtaining mobile hydroacoustic channel synchronistically

A technology of parameter measurement and underwater acoustic communication, applied in the field of communication, can solve the problems of frequency offset incompatibility, copy correlator losing the characteristics of the best detector, etc.

Inactive Publication Date: 2007-12-26
HARBIN ENG UNIV
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Problems solved by technology

[0003] However, the copy correlator is only adaptable to signals with similar input waveforms and different amplitude and delay parameters, but not to the frequency offset, that is, when there is a Doppler frequency offset, the copy correlator will lose its best detector characteristics

Method used

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  • Method for measuring parameters of hydroacoustic channel, and method for obtaining mobile hydroacoustic channel synchronistically
  • Method for measuring parameters of hydroacoustic channel, and method for obtaining mobile hydroacoustic channel synchronistically
  • Method for measuring parameters of hydroacoustic channel, and method for obtaining mobile hydroacoustic channel synchronistically

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Embodiment Construction

[0027] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0028] In the present invention, the detection code used for estimating channel parameters and the synchronization code used for underwater acoustic communication are both chirp signals, which can be expressed as:

[0029]

[0030] In the formula, s(t) is a linear frequency modulation signal with a pulse width of T, where f L is the starting frequency of the communication frequency band, β=B / T is the FM slope of the Pattem, and B is the bandwidth occupied by the signal.

[0031] Due to the relative motion between the transmitting end and the receiving end, Doppler frequency deviation will be generated, then the received signal can be expressed as:

[0032]

[0033] In the formula, η is the Doppler coefficient, which is related to the relative motion speed between receiving and sending.

[0034] In addition, in the process of signal propagation through the ...

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Abstract

The method comprises: making fractional order Fourier transformation for the received signal; searching optimal fractional order value; outputting the fractional order Fourier transformation of the optimal fractional order to calculate its model value; setting the threshold to make peak value test; by measuring the peak value and amplitude and time-delay of model value of fractional order model value, getting the parameter estimation of sound channel multi-target structure; measuring the maximum value of peak value of the Fourier transformation model value, and making shielding treatment for it; making inverse fractional order Fourier transformation, and using the inverse fractional order Fourier transformation to output time domain signals that are used as the reference signals of copy correlator; using correlated output peak as the windowing time base to realize the synchronization of mobile underwater acoustic communication.

Description

(1) Technical field [0001] The present invention relates to the technical field of communication, more specifically, to a method for realizing measurement of underwater acoustic channel parameters and a method for realizing synchronous acquisition of mobile underwater acoustic communication. (2) Background technology [0002] As a mature non-stationary signal, Chirp is widely used in sonar and radar. It is a pulse compression signal with a large time-width-bandwidth product obtained through nonlinear phase modulation. For active sonar, since the chirp signal has a sharp ambiguity function, the copy correlator has high detection performance and delay measurement accuracy when there is no Doppler frequency offset, and is the best detector for the signal. Therefore, the chirp pulse is usually used as the acoustic channel detection signal and the underwater acoustic communication frame synchronization signal at the transmitting end, and the measurement of the underwater acoustic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B13/02
Inventor 殷敬伟惠俊英郭龙祥王逸林
Owner HARBIN ENG UNIV
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