A vdes radio frequency front-end detection system for ships

Abstract

The invention discloses a VDES radio frequency front-end detection system for ships. The power divider module realizes that the radio frequency signal is divided into independent radio frequency channels and output to the crystal filter on the channel board module adapted to its respective channel, forming an independent frequency band The radio frequency signal is detected and identified by the power detection module. The power detection module detects the maximum power in the signal band, and controls the first radio frequency switch to select the radio frequency channel according to the maximum power output control signal. channel or amplified channel and output the signal to the second filter and enter the AD digital-to-analog conversion module for analog-to-digital conversion. By designing 5 independent radio frequency channels, the simultaneous reception and processing of radio frequency signals is ensured. The independent crystal filter filters each independent frequency point, and the signal selectivity is good.

Description

technical field [0001] The invention relates to a VDES radio frequency front-end detection system for ships, in particular to a VDES radio frequency front-end signal detection system suitable for a larger dynamic range, which belongs to the field of ship communication. Background technique [0002] In October 2015, the ITU-R M.2092-0 Recommendation of the International Telecommunication Union proposed the technical characteristics of the very high frequency data exchange system VDES in the VHF maritime mobile frequency band, and made the corresponding technical characteristics of the VDE system in the VDES system. It is stipulated that research institutions in many countries have joined in the research and experiment of this technology, and proposed their own design schemes for this communication system, including signal processing and data processing. At the same time, they put forward suggestions for standard proposals, but did not implement In particular, the definition a...

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Problems solved by technology

[0002] In October 2015, the ITU-R M.2092-0 Recommendation of the International Telecommunication Union proposed the technical characteristics of the very high frequency data exchange system VDES in the VHF maritime mobile frequency band, and made the corresponding technical characteristics of the VDE system in the VDES system. It is stipulated that research institutions in many countries have joined in the research and experiment of this technology, and proposed their own design schemes for this communication system, including signal processing and data processing. At the same time, they put forward suggestions for standard proposals, but did not implement In particular, the definition and treatment of the radio frequency part have not yet been clarified

However, the implementation of the above scheme is highly complex and the system configuration is huge, making it difficult to implement

At the same time, due to the strict requirements on signal dynamic range, receiving sensitivity, and channel isolation in the current VDES system technical index requirements, such as dynamic range reaching 100dB, receiving sensitivity reaching -120dBm or more, the above-mentioned scheme is used for device The performance requirements and the digital processing capability of the digital baseband backend also bring great challenges. Small processing errors will lead to failure of signal demodulation

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