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Mobile underwater acoustic communication Doppler coefficient estimation method based on chirp signals

A Doppler coefficient and underwater acoustic communication technology, which is applied in the field of Doppler coefficient estimation in mobile underwater acoustic communication, can solve the problems of inability to accurately estimate the Doppler coefficient and signal demodulation, and achieve high estimation accuracy , accurate estimation, and accurate demodulation effects

Active Publication Date: 2016-10-12
HARBIN ENG UNIV
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Problems solved by technology

The above technical solution is to estimate the overall Doppler coefficient through the synchronization signal or the cyclic sequence, but it cannot accurately estimate the Doppler coefficient of each symbol, nor can it achieve the signal while estimating the Doppler coefficient. The effect of accurate demodulation

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  • Mobile underwater acoustic communication Doppler coefficient estimation method based on chirp signals
  • Mobile underwater acoustic communication Doppler coefficient estimation method based on chirp signals
  • Mobile underwater acoustic communication Doppler coefficient estimation method based on chirp signals

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with specific embodiments.

[0026] Based on the chirp signal with Doppler tolerance, the present invention proposes a new method of Doppler coefficient estimation-sliding matching iterative Doppler coefficient estimation method. This method can not only measure the multiplicity of each symbol The Pule coefficient is accurately estimated, and the signal can be accurately demodulated while the Doppler coefficient is estimated, realizing Doppler compensation and data demodulation at the same time.

[0027] The Doppler coefficient estimation method of mobile underwater acoustic communication based on chirp signal includes:

[0028] Step 1: Select a suitable chirp signal as the modulation signal, and use CSSBOK (Chirp SpreadSpectrum Binary orthogonal keyed) modulation method for modulation;

[0029] Step 2: Use the amount of change in the number of sampling points of the chirp signal before and after the Doppler...

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Abstract

The invention provides a mobile underwater acoustic communication Doppler coefficient estimation method based on chirp signals. Suitable chirp signals are selected as modulation signals. Modulation is carried out through adoption of a CSSBOK (Chirp Spread Spectrum Binary orthogonal keyed) modulation mode. The variable quantity of an actual chirp signal length is obtained by employing the variable quantity of the sampling point quantity of the chirp signals before and after the Doppler effect is generated. Therefore, a Doppler coefficient is estimated. According to the mobile underwater acoustic communication Doppler coefficient estimation method based on the chirp signals provided by the invention, the method is simple and easy to carry out; the calculation quantity is low; the estimation precision is high; the Doppler coefficient of each code element can be estimated precisely; and the signals can be demodulated accurately.

Description

Technical field [0001] The invention relates to an underwater acoustic communication method, in particular to a mobile underwater acoustic communication Doppler coefficient estimation method. Background technique [0002] The Doppler estimation problem in underwater acoustic communication can be summarized into two categories: one is to measure the frequency of the received signal, and the Doppler coefficient is estimated through the offset of the frequency, and the other is based on the Doppler effect. For the effect of time-domain broadening or compression, the Doppler coefficient is estimated by measuring the time-domain broadening or compression of the signal. Among them, the more typical methods are the ambiguity function method and the block Doppler estimation method. However, the above methods are generally only suitable for Doppler estimation of still underwater acoustic communication. [0003] Most of the disclosed methods for estimating the Doppler coefficient of mobile ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B13/02
CPCH04B1/69H04B13/02H04B2001/6912
Inventor 刘凇佐乔钢刘磊马璐周锋孙宗鑫
Owner HARBIN ENG UNIV
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