CN103149905B - AIS (Automatic Identification System) Class B terminal-based DSC (Digital Selective Calling) control method - Google Patents
AIS (Automatic Identification System) Class B terminal-based DSC (Digital Selective Calling) control method Download PDFInfo
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- CN103149905B CN103149905B CN201310055297.7A CN201310055297A CN103149905B CN 103149905 B CN103149905 B CN 103149905B CN 201310055297 A CN201310055297 A CN 201310055297A CN 103149905 B CN103149905 B CN 103149905B
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Abstract
The invention relates to an AIS (Automatic Identification System) Class B terminal-based DSC (Digital Selective Calling) control method. The method comprises the following steps of: arranging an idle TDMA (Time Division Multiple Access) receiver in two TDMA receivers of an AIS terminal on a DSC channel to finish DSC data receiving by using a time sharing TDMA channel method; next, processing a received DSC data message; and then, setting parameters, such as power and receiving frequency range, of the TDMA receiver according to an analysis processing result of the message so as to realize AIS channel management, thereby realizing DSC message receiving and channel management functions by the AIS Class B type terminal without configuring the special DSC receiver. The method has the beneficial effects that the DSC function can be realized at the AIS terminal where the DSC receiver is not configured.
Description
Technical field
The present invention relates to a kind of DSC based on AIS terminal to control, relate to a kind of DSC control method based on AIS Class B terminal specifically.
Background technology
Ship automatic identification system AIS (Automatic Identification System) is a kind of novel ship navigation backup system developing formation on the friend or foe identification (IFF) device basis of naval vessel aircraft, owing to have employed the technology such as high precision satnav and the transmission of very high frequency(VHF) radiodigital, make between building berth and can transmit between ship bank and exchange information, thus the accident that greatly reduces occurs, in the epoch of having navigated by water by experience before also having made people take leave of, the epoch of digital navigation are welcome.
AIS system is divided into AIS building berth system and AIS base station system, and wherein AIS building berth system is divided into again category-A and category-B.Category-A uses SOTDMA(Self-Organized Time Division Multiple Access) agreement, be mainly used in 300 tons and above International Voyage Ship, 500 tons and above non-world navigation freighter; Category-B uses CSTDMA(Carrier Sense Time Division Multiple Access) agreement, be mainly applied as master with medium and small-scale vessel.Interactive information between building berth and ship bank is divided into static information and multidate information and channel management information, follow the radio communication suggestion ITU-RM.1371 of International Telecommunications Union (ITU), wherein, static information comprises name of vessel, catchword, MMSI code, captain, the beam, drinking water, Ship Types etc., and multidate information comprises course, the speed of a ship or plane, port of destination etc.These information provide the present situation of waterborne traffic just, have understood the mutual alignment etc. between ship-ship, for ensureing that navigation safety provides technical support.AIS equipment comprises at least one transmitter and two TDMA receivers, the frequency that transmit-receive sharing is identical, half-duplex mode, receive at 161.975MHz and 162.025MHz of acquiescence simultaneously, at regular intervals, system closing receive channel, opens transmission channel simultaneously, is alternately gone out by the Static and dynamic information transmitting of this terminal on A channel 161.975MHz and channel B 162.025MHz frequency.
DSC (Digital Seleetive Calling, digital selective calling) be a kind of system for maritime mobile service that Consultative Committee on International Radio (CCIR) advises, also be boats and ships when distress alerting and general call to all station by medium-high frequency band emission generalized calls system, it is not only boats and ships and provides radio communication function between base station, also for distress alerting provides technology platform.In addition, in order to ensure when the A channel of AIS terminal and channel B unavailable time, AIS still can receive channel administrative messag, one of permanent organization of International Telecommunications Union (ITU) Consultative Committee on International Radio (CCIR) also advises adopting DSC frequency range to complete the transmission of AIS channel management information, DSC is as the additional transport channel of AIS channel management information, and AIS base station initiatively can send form message in DSC frequency range.In order to raise the efficiency, AIS base station sends message in DSC frequency range regulation, unless the monitoring time table that maritime affairs competent authorities specify, all adopts the monitoring time of acquiescence.
ITU-RM.1371 standard agreement regulation forces category-A AIS must be equipped with DSC receiver, and namely have the function of DSC UHF band reception AIS message, the DSC receiver of category-B AIS terminal is can arrangement.Therefore, realize DSC function in the category-B AIS terminal not configuring DSC receiver, there is real world applications meaning undoubtedly.
Summary of the invention
A kind of AIS Class B terminal, is made up of microprocessor U1, RS-232 interface U2, eeprom memory U3, GPS module U4, reset circuit U5, modulation /demodulation module U6, power detection module U7, transmission channel U8, TMDA receiving cable 1 U9, TDMA receiving cable 2 U10, transmit receive antenna U11; U1 with U2, U3, U4, U5, U6, U7 are connected, U6 with U8, U9, U10, U1 are connected, U11 with U8, U9, U10 are connected, U7 with U8, U1 are connected.
Based on AIS Class B terminal, the AIS Class category-B terminal that the object of the invention is for not configuring DSC receiver provides a kind of DSC control method, realizes the channel management subsidiary function of AIS.
In order to achieve the above object, the concrete control method of the present invention is: the employing time shares the method for TDMA channel, is first arranged on DSC channel the free time one in AIS terminal two TDMA receivers, completes DSC data receiver; Secondly, the DSC data message received is processed; Then, according to the dissection process result of message, the parameter of TDMA receiver is arranged as power, reception frequency range etc., realizes AIS channel management, thus make AIS Class category-B terminal also can realize the reception of DSC message and channel management function without the need to configure dedicated DSC receiver.
Concrete grammar of the present invention is: when entering DSC monitoring time section, controls to switch one of idle TDMA receiver to DSC frequency range, receives DSC message; After DSC message finishes receiving, start the operation of DSC packet parsing, mainly through format conversion, phasing, the step such as verify and unpack; Resolving in the message obtained, only to function code 104 message, namely VTS (VTS) extended message is further processed, and obtains in transmitter power, channel management the subchannel, the channel management region that receive in the main channel receiving and send, the subchannel receiving in channel management and send, channel management and use Mercator to project the AIS channel management information such as rectangular area from the packet parsing of its Function Extension code 01,09,10,11,12 and 13; When the time exits DSC storage and monitoring time segment, the TDMA receiver being arranged to DSC frequency range is switched back AIS frequency range, recover the AIS packet sending and receiving function of this receiver channel.
The feature of this method is also: have DSC monitoring period of time table, is made up of GPS1 field, GPS2 field, GPS3 field, GPS4 field, DSC-TIME1 field, DSC-TIME2 field, as shown in table 1, preserves DSC monitoring time in setting regions.
Wherein, anchor point 1, anchor point 2, anchor point 3 and anchor point 4 constitute 4 points of a blocked areas, and DSC-TIME1, DSC-TIME2 indicate DSC in the region determined by anchor point 1, anchor point 2, anchor point 3 and anchor point 4 four points to monitor start and end time.During DSC area monitoring, segment table independently can preserve the DSC monitoring time in multiple region, and the extraneous DSC monitoring time of setting regions adopts the monitoring time of acquiescence.
The DSC control method of described a kind of AIS Class B terminal, when preparing DSC monitoring, first checks GPS state, checks its whether effective location, if effective location just can carry out follow-up deterministic process; Secondly, according to GPS effectively when prelocalization longitude and latitude, judge in the region that 4 points (GPS1 field, GPS2 field, GPS3 field, GPS4 field contents) whether terminal location records in DSC monitoring period of time table delimited, if, read the DSC-TIME1 field of this record, DSC-TIME2 field contents monitors start time and end time as DSC, otherwise adopt start time and the end time of acquiescence, as start time and the end time of DSC monitoring; Then, judge current time whether within the start time and end time of DSC monitoring, if, explanation needs to start DSC monitoring, when starting DSC monitoring, by the free time, a TDMA not being in DSC monitoring state is switched to DSC frequency range, enters DSC monitoring state; If current time is not within the scope of DSC monitoring time, then the TDMA receiver being in DSC frequency range listening state is switched to AIS frequency range.
Compared with prior art, the invention has the beneficial effects as follows: DSC function can be realized in the AIS terminal not configuring DSC receiver.
Object of the present invention, feature and advantage also will be described in detail by reference to the accompanying drawings by embodiment.
Accompanying drawing explanation
Fig. 1 is an AIS Class B terminal block diagram of the present invention.
Fig. 2 is a DSC control method process flow diagram of the present invention.
Fig. 3 is a DSC message processing method process flow diagram of the present invention.
Embodiment
In Fig. 1, U1 is microprocessor, and U2 is RS-232 interface, and U3 is eeprom memory, U4 is GPS module, and U5 is reset circuit, and U6 is modulation /demodulation module, and U7 is power detection module, U8 is transmission channel, and U9 is TMDA receiving cable 1, U10 be TDMA receiving cable 2, U11 is transmit receive antenna; U1 with U2, U3, U4, U5, U6, U7 are connected, U6 with U8, U9, U10, U1 are connected, U11 with U8, U9, U10 are connected, U7 with U8, U1 are connected.
In order to further illustrate specific embodiment of the invention, the process flow diagram shown in composition graphs 1, Fig. 2, specific implementation process is done to this method and describes, comprise the following steps:
Step 101:DSC monitoring judges to start, and then performs step 102;
Step 102: judge that whether gps data is effective, effectively, then perform step 103, otherwise perform step 107;
Step 103: judge that in the current GPS location region whether 4 points are specified in [during DSC area monitoring segment table] record, the region of record can be multiple; If wherein in a regional extent, then perform step 105, otherwise perform step 104;
Step 104: the start time that DSC-TIME1, DSC-TIME2 of reading GPS region in [during DSC area monitoring segment table] monitors as DSC and end time, then execution step 106;
Step 105: read start time and end time, then execution step 106 that default Start Time and end time monitor as DSC;
Step 106: whether current time within the start time and end time of DSC monitoring, if in this time range, then performs step 109, otherwise perform step 107;
Step 107: judge currently whether have TDMA receiver to enter DSC monitoring state, if had, then performs step 108, otherwise performs step 112;
Step 108: DSC frequency range TDMA receiver is switched back the setting of AIS frequency range and exit DSC monitoring state, perform step 112;
Step 109: judge currently whether have TDMA receiver to enter DSC monitoring state, if had, then performs step 111, otherwise performs step 110;
Step 110: switch one of idle TDMA receiver to DSC frequency range, arrange and enter DSC monitoring state, then perform step 112;
Step 111: judge whether the DSC monitoring end time arrives, if arrived, then perform step 108, otherwise perform step 112;
Step 112:DSC monitors end.
Step 201:DSC Message processing starts, and then performs step 202;
Step 202: carry out phasing, checking treatment to the DSC message accepted, then performs step 203;
Step 203: whether correctly to judge DSC message format, verification, if correctly, then perform step 204, otherwise perform step 214;
Step 204: according to contents such as this DSC message function code, format characters, judges that whether this message is for the calling message of specifying marine site, if so, then performs step 208, otherwise performs step 205;
Step 205: judge this message whether for the calling of all AIS terminals, if so, then performs step 210, otherwise performs step 206;
Step 206: judge that whether this message is for the calling of specifying AIS terminal, if so, then performs step 207, otherwise performs step 214;
Step 207: judge No. MMSI that this message calls out whether consistent with No. MMSI, this terminal, if unanimously, then perform step 210, otherwise perform step 214;
Step 208: judge whether the GPS of this terminal locates effectively, if effectively, then performs step 209, otherwise performs step 214;
Step 209: according to the effective location longitude and latitude of GPS, judges whether terminal current location is specifying within the scope of marine site, if in appointment marine site, then perform step 210, otherwise performs step 214;
Step 210: resolve further DSC message content, then performs step 211;
Step 211: the function code of resolving acquisition according to DSC message further, whether arbitration functions code is 104, if so, then performs step 212, otherwise performs step 214;
Step 212: extract corresponding configuration parameter according to the Function Extension symbol in DSC message, then perform step 213;
Step 213: preserve the configuration parameter extracted, and execution revises setting accordingly, then performs step 214;
Step 214:DSC Message processing terminates.
Although the foregoing describe the specific embodiment of the present invention; but be familiar with those skilled in the art should be appreciated that; specific embodiment described by us is illustrative; instead of for limiting the scope of the invention; anyly inspire the equivalence done to modify by the technology of the present invention route and change, all should be encompassed in scope that the claims in the present invention protect.
Claims (1)
1. based on a DSC control method for AIS Class B terminal, by microprocessor (U1), RS-232 interface (U2), eeprom memory (U3), GPS module (U4), reset circuit (U5), modulation /demodulation module (U6), power detection module (U7), transmission channel (U8), TMDA receiving cable 1(U9), TDMA receiving cable 2(U10), transmit receive antenna (U11) forms, microprocessor (U1) and RS-232 interface (U2), eeprom memory (U3), GPS module (U4), reset circuit (U5), modulation /demodulation module (U6), power detection module (U7) is connected, modulation /demodulation module (U6) and transmission channel (U8), TMDA receiving cable 1(U9), TDMA receiving cable 2(U10), microprocessor (U1) is connected, transmit receive antenna (U11) and transmission channel (U8), TMDA receiving cable 1(U9), TDMA receiving cable 2(U10) be connected, power detection module (U7) and transmission channel (U8), microprocessor (U1) is connected, during control, the employing time shares the method for TDMA channel, first the free time one in terminal two TDMA receivers is arranged on DSC channel, secondly, dissection process is carried out to the DSC data message received, then, according to the dissection process result of message, the parameter of TDMA receiver is arranged, realizes AIS channel management, it is characterized in that:
(1) the DSC control method described in, have DSC monitoring period of time table, by GPS1 field, GPS2 field, GPS3 field, GPS4 field, DSC-TIME1 field, DSC-TIME2 field forms, according to GPS effectively when prelocalization longitude and latitude, judge the GPS1 field whether terminal location records in DSC monitoring period of time table, GPS2 field, GPS3 field, in the region that GPS4 field contents 4 points delimited, if, read the DSC-TIME1 field of this record, DSC-TIME2 field contents monitors start time and end time as DSC, otherwise adopt start time and the end time of acquiescence, as start time and the end time of DSC monitoring,
(2) the DSC control method described in, start DSC monitoring time, by the free time, be not in DSC monitoring a TDMA be switched to DSC frequency range, enter DSC monitoring state; If current time is not within the scope of DSC monitoring time, then the TDMA receiver being in DSC frequency range listening state is switched to AIS frequency range.
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| JP2005119333A (en) * | 2003-10-14 | 2005-05-12 | Kaiyo Denshi Kogyo Kk | Beacon device |
| CN102098793A (en) * | 2010-12-31 | 2011-06-15 | 成都天奥信息科技有限公司 | Link access method for AIS (Automatic Identification System) Class B shipborne responder |
| EP2688052A1 (en) * | 2011-09-23 | 2014-01-22 | Aeromarine S. L. | Maritime alarm and rescue system and method for controlling said system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005119333A (en) * | 2003-10-14 | 2005-05-12 | Kaiyo Denshi Kogyo Kk | Beacon device |
| CN102098793A (en) * | 2010-12-31 | 2011-06-15 | 成都天奥信息科技有限公司 | Link access method for AIS (Automatic Identification System) Class B shipborne responder |
| EP2688052A1 (en) * | 2011-09-23 | 2014-01-22 | Aeromarine S. L. | Maritime alarm and rescue system and method for controlling said system |
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Application publication date: 20130612 Assignee: FUJIAN JIXING INTELLIGENT TECHNOLOGY CO., LTD. Assignor: Fujian Normal University Contract record no.: 2015350000090 Denomination of invention: AIS (Automatic Identification System) Class B terminal-based DSC (Digital Selective Calling) control method Granted publication date: 20150114 License type: Exclusive License Record date: 20151113 |
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