NAVTEX demodulator based on DSTFT (discrete short time Fourier transform) and demodulation method thereof

A demodulation method and demodulator technology, applied in the direction of electrical components, transmission systems, etc., can solve the problems of large volume occupied by the receiver, complex analog circuits, performance improvement, and difficulty in adding new functions, etc., to achieve fast capture , good demodulation effect, the effect of solving the contradiction between sampling accuracy and speed

Inactive Publication Date: 2012-06-20
ZHEJIANG UNIV +1
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Problems solved by technology

The analog circuit of the NAVTEX receiver used in the past is very complicated. To achieve the required accuracy, the volume occupied by the receiver will be too large, and it will bring difficulties to the improvement of performance and the addition of new functions.

Method used

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  • NAVTEX demodulator based on DSTFT (discrete short time Fourier transform) and demodulation method thereof
  • NAVTEX demodulator based on DSTFT (discrete short time Fourier transform) and demodulation method thereof
  • NAVTEX demodulator based on DSTFT (discrete short time Fourier transform) and demodulation method thereof

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Embodiment Construction

[0030] The present invention aims at the shortcomings of the previous NAVTEX receivers, such as complex analog circuits, excessive volume of the receiver in order to achieve the required precision, difficulty in improving performance and adding new functions, etc., and proposes a digital NAVTEX signal based on software radio technology demodulation method.

[0031] As a complete NAVTEX information receiving scheme, the DSTFT-based NAVTEX demodulator has the characteristics of easy software upgrade and modification. And adopting such a NAVTEX information demodulation scheme can effectively separate the information receiving unit from the information processing unit. This structure greatly reduces the burden on the back-end information processing unit and enables the information processing unit to better perform other control functions. It is conducive to its expansion of other functions.

[0032] like figure 1 As shown, the NAVTEX demodulator based on DSTFT integrates the...

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Abstract

The invention discloses an NAVTEX demodulator based on DSTFT (discrete short time Fourier transform) and a demodulation method thereof. The NAVTEX demodulator comprises an NAVTEX signal A / D (analog / digital) sampling module, an NAVTEX signal demodulation module and an NAVTEX information decoding module, wherein the NAVTEX signal A / D sampling module performs double-channel A / D sampling and ping-pong storage on an NAVTEX signal; the NAVTEX signal demodulation module performs digital demodulation on the NAVTEX signal so as to obtain a corresponding code element; and the NAVTEX information decoding module respectively decodes Chinese and English NAVTEX information and performs lost position compensation on the code element so as to obtain the NAVTEX information. By using the NAVTEX demodulator, the problems that the previous NAVTEX analog demodulation is complex in circuit and difficult to upgrade are solved, and the digital demodulation of the NAVTEX signal can be achieved by virtue of a software radio technology. The NAVTEX demodulator is suitable for an NAVTEX receiver designed by adopting a software radio method.

Description

technical field [0001] The invention relates to the field of marine radio communication and software radio, in particular to a NAVTEX demodulator based on DSTFT (discrete short-time Fourier transform). [0002] Background technique [0003] The NAVTEX system refers to a system that broadcasts and automatically receives navigational warnings, weather warnings, weather forecasts and emergency information (collectively referred to as maritime safety information) for ships through narrowband direct printing (NBDP). It is an important component of the Global Maritime Distress and Safety System and an integral part of the Worldwide Navigational Warning Service (WWNWS) stipulated in the International Maritime Organization (IMO) Resolution A.419(XI). [0004] According to the division of NAVTEX regions by the International Maritime Organization, my country has successively established 7 coast stations for NAVTEX business in Sanya, Guangzhou, Fuzhou, Shanghai, Dalian, Tianjin, Zhanj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16
Inventor 金文光杨基鸿张正宇林利君
Owner ZHEJIANG UNIV
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