CN112398777A - Very high frequency data exchange system - Google Patents
Very high frequency data exchange system Download PDFInfo
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- CN112398777A CN112398777A CN202011129469.7A CN202011129469A CN112398777A CN 112398777 A CN112398777 A CN 112398777A CN 202011129469 A CN202011129469 A CN 202011129469A CN 112398777 A CN112398777 A CN 112398777A
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- 238000012544 monitoring process Methods 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000012795 verification Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000006855 networking Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
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- 238000012360 testing method Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
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- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G3/00—Traffic control systems for marine craft
- G08G3/02—Anti-collision systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Ocean & Marine Engineering (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transceivers (AREA)
- Transmitters (AREA)
Abstract
The invention discloses a very high frequency data exchange system, which comprises three AIS, ASM, VDE processing and power supply, peripheral equipment and interfaces, wherein the three AIS, ASM and VDE processing are electrically connected in series; the input ends of the TXVCO and the modulator are connected with the output ends of the AIS, ASM and VDE processing, and the output ends of the TXVCO and the modulator are connected with the input end of the frequency divider. The invention has the multi-mode applicability of Random Access Time Division Multiple Access (RATDMA), Incremental Time Division Multiple Access (ITDMA) and Fixed Access Time Division Multiple Access (FATDMA), realizes the maximum communication rate between ends to be 307.2kbps, greatly improves the data transmission rate, and simultaneously supports the network safety control, signal monitoring and identification, and supports external application program interfaces, wherein the network safety control, the signal monitoring and identification, and the like can realize selection of a super high frequency channel on water, data synchronization in idle time, language-independent communication transmission, data integrity monitoring and verification, identity verification, encryption and the like.
Description
Technical Field
The invention relates to the technical field of radio communication, in particular to a very high frequency data exchange system.
Background
The AIS is a radio communication navigation collision avoidance device based on a VHF frequency band and arranged on a ship, and is suitable for various ships such as inland rivers, ports and open seas. The main components of the AIS are a GPS receiver, a communications processor, two VHF data receivers and a VHF data transmitter. The AIS system is a practical system for automatically exchanging information among ships. The exchange information comprises the current navigation state, ship information and the like, and effective collision prevention measures can be provided. The AIS becomes a ship reporting system and is beneficial to management work by configuring the ship common information such as the ship marine mobile communication service identification code (MMSI), call sign, ship name, ship type and size and the like in the equipment. The existing AIS system adopts GMSK modulation and demodulation mode, provides 9.6 bit rate data transmission rate on 25KHz channel, and the AIS has the defects of frequency congestion, narrow bandwidth (9.6K) and incapability of supporting safe information broadcasting.
Aiming at the problems of narrow bandwidth, small capacity and the like of the existing marine safety communication 'automatic ship identification system' (AIS), a new generation of marine safety communication 'very high frequency data exchange system' is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a very high frequency data exchange system which has the multi-mode applicability of Random Access Time Division Multiple Access (RATDMA), Incremental Time Division Multiple Access (ITDMA) and Fixed Access Time Division Multiple Access (FATDMA), realizes the maximum communication rate between end to end of 307.2kbps, greatly improves the data transmission rate, and simultaneously supports network safety control, signal monitoring and identification, and external application program interfaces, wherein the network safety control, the signal monitoring and identification, the external application program interfaces, the network safety control, the link level data integrity monitoring and verification, the identity verification, the encryption and the like can be realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
the very high frequency data exchange system comprises three AIS, ASM and VDE processing units, a power supply, an external device and an interface, wherein the three AIS, ASM and VDE processing units are electrically connected in series;
the input ends of the TXVCO and the modulator are connected with the output ends of AIS, ASM and VDE processing, and the output ends of the TXVCO and the modulator are connected with the input end of the frequency divider;
the input end of the D/A is connected with the output ends of AIS, ASM and VDE processing, and the output end of the D/A is connected with the input end of the LPF;
the output end of the LPF is connected with the input end of the quadrature modulator;
the output ends of the frequency divider and the quadrature modulator are connected with the input end of the radio frequency switch;
the output end of the radio frequency switch is connected with the input end of the first Filter;
the output end of the Filter is connected with the input end of the primary power amplifier;
the output end of the primary power amplifier is connected with the input end of the Tx _ PA;
a Tx _ PA, an output terminal of the Tx _ PA being connected with an input terminal of the RF _ Switch;
the output end of the RF _ Switch is connected with the input end of the second Filter;
the output end of the second Filter is connected with the input end of the LNA;
the output end of the LNA is connected with the input end of the third Filter;
the output end of the third Filter is respectively connected with the input ends of the three first frequency mixers, and a local oscillator clock is arranged between every two adjacent first frequency mixers;
the output end of the first mixer is connected with the input end of the amplifier;
the output end of the first amplifier is connected with the input end of the fourth Filter;
the output end of the fourth Filter is respectively connected with the input ends of the second mixer, the second amplifier and the demodulator;
the output ends of the three second mixers, the three second amplifiers and the three demodulators are all connected with the input end of the A/D;
and the output end of the A/D is connected with the input ends of AIS, ASM and VDE processing.
Preferably, the first Filter, the second Filter, the third Filter and the fourth Filter are all amplifiers with the same power.
Preferably, the output ends of the local oscillator clocks are respectively connected with two adjacent first mixers.
The invention has the following beneficial effects:
the multi-mode applicability of Random Access Time Division Multiple Access (RATDMA), Incremental Time Division Multiple Access (ITDMA) and Fixed Access Time Division Multiple Access (FATDMA) is improved by adopting phase shift keying (pi/4 QPSK) and quadrature amplitude modulation (16QAM) modulation-demodulation algorithms; based on the constraints of very high frequency, such as multiple frequency bands, reliability, timeliness and the like, the communication and networking technology of VDES on ships and ship banks is utilized to realize remote automatic ship identification, special application message maritime safety information dissemination and multi-carrier aggregation very high frequency data exchange; the method supports network security control, signal monitoring and identification, and supports external application program interfaces, wherein the network security control, the signal monitoring and identification support can realize selection of a water VHF channel, data synchronization in idle time, language-independent communication transmission, link-level data integrity monitoring and verification, identity authentication, encryption and the like; the maximum communication rate between end to end is 307.2kbps, and the data transmission rate is greatly improved.
Drawings
Fig. 1 is a block diagram of a vhf data switching system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, the vhf data exchange system includes three AIS, ASM, VDE processes and power supplies, peripherals and interfaces, and the three AIS, ASM, VDE processes are electrically connected in series;
the input ends of the TXVCO and the modulator are connected with the output ends of AIS, ASM and VDE processing, and the output ends of the TXVCO and the modulator are connected with the input end of the frequency divider;
the input end of the D/A is connected with the output ends of AIS, ASM and VDE processing, and the output end of the D/A is connected with the input end of the LPF;
the output end of the LPF is connected with the input end of the quadrature modulator;
the output ends of the frequency divider and the quadrature modulator are connected with the input end of the radio frequency switch;
the output end of the radio frequency switch is connected with the input end of the first Filter;
the output end of the Filter is connected with the input end of the primary power amplifier;
the output end of the primary power amplifier is connected with the input end of the Tx _ PA;
the output end of the Tx _ PA is connected with the input end of the RF _ Switch;
the output end of the RF _ Switch is connected with the input end of the second Filter;
the output end of the second Filter is connected with the input end of the LNA;
the output end of the LNA is connected with the input end of the third Filter;
the output end of the third Filter is respectively connected with the input ends of the three first frequency mixers, and a local oscillator clock is arranged between every two adjacent first frequency mixers;
the output end of the first mixer is connected with the input end of the amplifier;
the output end of the first amplifier is connected with the input end of the fourth Filter;
the output end of the fourth Filter is respectively connected with the input ends of the second mixer, the second amplifier and the demodulator;
the output ends of the three second mixers, the three second amplifiers and the three demodulators are all connected with the input end of the A/D;
and the output end of the A/D is connected with the input ends of AIS, ASM and VDE processing.
The first Filter, the second Filter, the third Filter and the fourth Filter are all amplifiers with the same power; and the output end of the local oscillator clock is respectively connected with two adjacent first frequency mixers.
The invention has the following implementation steps:
step one, theoretical model: according to the seven-layer protocol structure of the OSI system structure, carrying out corresponding layered structure research and design development on a physical layer, a link layer, a network layer and a transmission layer;
step two, principle prototype: adopting a software radio scheme to simulate and receive and quantize radio signals, and analyzing and processing the signals by using computer software;
thirdly, communication networking: different networking modes such as a designated mode, a polling mode and the like are realized by adopting various time division multiple access technologies, and the applicability to ship communication is realized;
step four, engineering prototype: based on the theoretical model, the principle prototype and the communication networking scheme, an ARM architecture is utilized to design and develop an engineering prototype suitable for being installed and used on a ship;
and fifthly, testing: testing the engineering prototype according to the international organization proposal standard, summarizing the test output result, and continuously optimizing and improving the performance parameters of the engineering prototype;
sixthly, application verification: the engineering prototype carries traffic and transportation ships to carry out application verification, and meets the requirements of maritime application such as remote ship automatic identification, special application message maritime safety stop broadcasting, multi-carrier aggregation very high frequency data exchange and the like.
The method mainly comprises the steps of planning and allocating the overwater very high frequency spectrum, analyzing the offshore very high frequency spectrum environment, and constructing a very high frequency channel communication model; various functional modules of the VDES are realized by utilizing software radio technology and combining hardware functional modules, wherein the functional modules comprise analog-digital conversion and channel separation through a programmable digital filter; the selection of the very high frequency channel is realized by software programming by using a digital signal processor technology; the software architecture is designed by adopting a plurality of processing methods, so that the radio frequency communication transceiver has modulation and demodulation functions of phase shift keying and quadrature amplitude modulation and related coding and decoding functions, and realizes transmitted information sampling, quantization, coding/decoding, operation processing and transformation through software programming so as to realize the transceiving function of radio frequency communication; the communication networking is realized through the random access time division multiple access, the incremental time division multiple access and the fixed access time division multiple access multi-mode applicability, and the functions of different network protocols, control and the like are realized through software programming.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (3)
1. The very high frequency data exchange system comprises three AIS, ASM and VDE processing and power supplies, peripherals and interfaces, and is characterized in that the three AIS, ASM and VDE processing are electrically connected in series;
the input ends of the TXVCO and the modulator are connected with the output ends of AIS, ASM and VDE processing, and the output ends of the TXVCO and the modulator are connected with the input end of the frequency divider;
the input end of the D/A is connected with the output ends of AIS, ASM and VDE processing, and the output end of the D/A is connected with the input end of the LPF;
the output end of the LPF is connected with the input end of the quadrature modulator;
the output ends of the frequency divider and the quadrature modulator are connected with the input end of the radio frequency switch;
the output end of the radio frequency switch is connected with the input end of the first Filter;
the output end of the Filter is connected with the input end of the primary power amplifier;
the output end of the primary power amplifier is connected with the input end of the Tx _ PA;
a Tx _ PA, an output terminal of the Tx _ PA being connected with an input terminal of the RF _ Switch;
the output end of the RF _ Switch is connected with the input end of the second Filter;
the output end of the second Filter is connected with the input end of the LNA;
the output end of the LNA is connected with the input end of the third Filter;
the output end of the third Filter is respectively connected with the input ends of the three first frequency mixers, and a local oscillator clock is arranged between every two adjacent first frequency mixers;
the output end of the first mixer is connected with the input end of the amplifier;
the output end of the first amplifier is connected with the input end of the fourth Filter;
the output end of the fourth Filter is respectively connected with the input ends of the second mixer, the second amplifier and the demodulator;
the output ends of the three second mixers, the three second amplifiers and the three demodulators are all connected with the input end of the A/D;
and the output end of the A/D is connected with the input ends of AIS, ASM and VDE processing.
2. Very high frequency data exchange system according to claim 1, characterized in that the first Filter, the second Filter, the third Filter and the fourth Filter are all amplifiers of the same power.
3. The very high frequency data switching system according to claim 1, wherein the outputs of the local oscillator clocks are connected to two adjacent first mixers, respectively.
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Cited By (2)
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| CN113708794A (en) * | 2021-08-11 | 2021-11-26 | 成都中科华芯科技有限公司 | VDES-A type machine system |
| CN115276763A (en) * | 2022-06-30 | 2022-11-01 | 成都天奥信息科技有限公司 | Ship/standard load VDES system communication terminal |
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| CN112398777B (en) | 2023-02-03 |
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Effective date of registration: 20230529 Address after: Building 1, No. 33 Fulian 3rd Road, Baoshan District, Shanghai, 201906 Patentee after: CTTIC COMMUNIATION BIG DATA (SHANGHAI) TECHNOLOGY Co.,Ltd. Address before: 200000 6th floor, No.9 Lane 360, Feihong Road, Hongkou District, Shanghai Patentee before: CTTIC SHANGHAI CO.,LTD. |
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Effective date of registration: 20240125 Address after: 200000 6th floor, No.9 Lane 360, Feihong Road, Hongkou District, Shanghai Patentee after: CTTIC SHANGHAI CO.,LTD. Country or region after: China Address before: Building 1, No. 33 Fulian 3rd Road, Baoshan District, Shanghai, 201906 Patentee before: CTTIC COMMUNIATION BIG DATA (SHANGHAI) TECHNOLOGY Co.,Ltd. Country or region before: China |