VDES radio frequency front-end detection system for ships

Abstract

The invention discloses a VDES radio frequency front-end detection system for ships. A power divider module is used for dividing a radio frequency signal into five independent radio frequency paths, and outputting the five independent radio frequency channels to crystal filters on channel board modules corresponding to respective channels to form a radio frequency signal in an independent frequency band; and a power detection module is used for detecting and recognizing the radio frequency signal. The power detection module detects a signal in-band power maximum value, outputs a control signalaccording to the power maximum value to control a first radio frequency switch to select a radio frequency path, selects a radio frequency direct path or an amplification path, outputs a signal to asecond filter, and enters an analog to digital (AD) conversion module to perform AD conversion. Through design of five independent radio frequency paths, radio frequency signals can be received and processed simultaneously. The independent crystal filters are used for filtering each independent frequency point, thereby achieving high signal selectivity.

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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