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A modulation and demodulation system used in vde system

A modulation and demodulation and system technology, applied in the field of marine communication, which can solve the problems of information congestion, congestion of available frequency bands for AIS systems, and influence on navigation safety.

Active Publication Date: 2020-08-11
深圳市华讯方舟光电技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the increasing demand for AIS system communication in the VHF frequency band, the usable frequency band of the AIS system is already very crowded, and the occupancy rate of the frequency band has reached more than 50% in many busy ports. When the road load exceeds 50%, it will lead to information congestion and other problems, seriously affecting navigation safety

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  • A modulation and demodulation system used in vde system
  • A modulation and demodulation system used in vde system
  • A modulation and demodulation system used in vde system

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Embodiment Construction

[0031] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0032] Such as figure 1 As shown, a modulation and demodulation system for the VDE system, which includes AIS system, ASM system, VDE system demodulation receiving circuit, demodulation data combiner, ARM receiving data interface, internal signal source module, ARM transmission data interface, AIS modulator, ASM modulator, VDE modulator, adjustment switch, DAC module, transmission analog front end and transmission timing control and channel selection module; the three systems of AIS system, ASM system and VDE system are explained The demodulation data output terminals of the modulation receiving circuit are respectively connected with the first, second and third data input terminals of the demodulation data combiner, and the output terminal...

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Abstract

The present invention discloses a modulation demodulation system for a VDE system. The system comprises an AIS system demodulation receiving loop, an ASM system demodulation receiving loop, a VDE system demodulation receiving loop, a demodulation data combiner, an ARM data receiving interface, an internal signal source module, an ARM data sending interface, an AIS modulator, an ASM modulator, a VDE modulator, an adjusting switch, a DAC module, a sending analog front end and a sending timing control and channel selection module. The present invention provides a multiple modulation demodulation systems-based comprehensive baseband board system. The system is compatible with the AIS communications system and also can use the VDES system to meet demands of a future maritime communications system, can perform current AIS system communications services, and also can process a new generation of VDES communications services.

Description

technical field [0001] The invention relates to the field of marine communication, in particular to a modulation and demodulation system used in the VDE system. Background technique [0002] Modern ships are developing in the direction of large-scale and high-speed. The number of ships and channel traffic is dense and the number of dangerous goods loaded is constantly increasing. Average accidents occur from time to time, which seriously threatens the safety of ship navigation and the marine ecological environment. [0003] At present, the port communication standard is mainly based on the ship's automatic identification system (AIS). The system uses VHF87 and 88 channels as dedicated channels (AIS1 and AIS2 channels), using frequency shift keying GMSK modulation, open system interconnection working mode ( OSM), self-organizing time-division multiple access (SOTDMA) protocol, and data link layer follow HDLC communication protocol and digital communication technology, so that...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00
CPCH04L27/00H04L27/0002
Inventor 李晓东喻袁洲王林富招弟李毅
Owner 深圳市华讯方舟光电技术有限公司