CN103149905A - 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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- CN103149905A CN103149905A CN2013100552977A CN201310055297A CN103149905A CN 103149905 A CN103149905 A CN 103149905A CN 2013100552977 A CN2013100552977 A CN 2013100552977A CN 201310055297 A CN201310055297 A CN 201310055297A CN 103149905 A CN103149905 A CN 103149905A
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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 the AIS terminal and control, relate to specifically a kind of DSC control method based on AIS Class B terminal.
Background technology
Ship automatic identification system AIS (Automatic Identification System) is a kind of novel ship navigation backup system that development forms on the friend or foe identification (IFF) device basis of naval vessel aircraft, owing to having adopted the technology such as high precision satnav and the transmission of very high frequency(VHF) radiodigital, make between building berth and the ship bank between can transmit and exchange message, thereby greatly reduced the accident generation, also make people take leave of the epoch of navigating by water by experience in the past, welcome the epoch of digital navigation.
The 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, mainly be applied as the 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 mutual alignment between ship-ship etc., 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, 161.975MHz and 162.025MHz in acquiescence receives simultaneously, at regular intervals, the system closing receive channel is opened transmission channel simultaneously, alternately on A channel 161.975MHz and B passage 162.025MHz frequency, the Static and dynamic information transmitting of this terminal is gone out.
DSC (Digital Seleetive Calling, digital selective calling) be a kind of system for maritime mobile service of Consultative Committee on International Radio's suggestion, also boats and ships generalized calls systems by the medium-high frequency band emission when distress alerting and general call to all station, it not only provides radio communication function between base station for boats and ships, also provides technology platform for distress alerting.In addition, in order to guarantee when the A channel of AIS terminal and B passage when unavailable, AIS still can the receive channel administrative messag, one of permanent organization of International Telecommunications Union (ITU) Consultative Committee on International Radio (CCIR) also advises adopting the DSC frequency range to complete the transmission of AIS channel management information, DSC is as the auxiliary transmission channel of AIS channel management information, and AIS base station meeting initiatively sends the form message on the DSC frequency range.In order to raise the efficiency, the AIS base station sends message in the DSC frequency range regulation, unless the monitoring time table of maritime affairs competent authorities regulation all adopts the monitoring time of acquiescence.
The ITU-RM.1371 standard protocol specifies is forced the essential DSC of outfit of category-A AIS receiver, the function of DSC frequency range reception AIS message is namely arranged, but the DSC receiver of category-B AIS terminal is arrangement.Therefore, realize the DSC function in the category-B AIS terminal that does not configure the DSC receiver, have undoubtedly the real world applications meaning.
Summary of the invention
A kind of AIS Class B terminal is comprised 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 is connected with U2, U3, U4, U5, U6, U7, and U6 is connected with U8, U9, U10, U1, and U11 is connected with U8, U9, U10, and U7 is connected with U8, U1.
Based on AIS Class B terminal, the objective of the invention is provides a kind of DSC control method for the AIS Class category-B terminal that does not configure the DSC receiver, 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 is shared the method for TDMA channel, at first one of the free time in two TDMA receivers of AIS terminal is arranged on the DSC channel, completes the DSC data receiver; Secondly, the DSC data message that receives is processed; Then, dissection process result according to message, parameter such as power, reception frequency range etc. to the TDMA receiver arrange, and realize the AIS channel management, can realize that also the DSC message receives and the channel management function thereby make AIS Class category-B terminal need not configure dedicated DSC receiver.
Concrete grammar of the present invention is: when entering DSC monitoring time section, control and switch one of idle TDMA receiver to the DSC frequency range, receive the DSC message; After the DSC message finishes receiving, start the operation of DSC packet parsing, mainly through format conversion, phasing, verification and the step such as unpack; In resolving the message that obtains, only to function code 104 messages, be that VTS (VTS) extended message is further processed, subchannel, the channel management zone that receives in the subchannel that receives and send in the main channel that obtains to receive in transmitter power, channel management and send from its Function Extension code 01,09,10,11,12 and 13 packet parsing, channel management, channel management and use the Mercator to throw the AIS channel management information such as rectangular area; When the time is withdrawed from the DSC storage and monitoring time segment, the TDMA receiver of being arranged to the DSC frequency range is switched back the AIS frequency range, recover the AIS packet sending and receiving function of this receiver channel.
The feature of this method also is: has DSC monitoring period of time table, formed by GPS1 field, GPS2 field, GPS3 field, GPS4 field, DSC-TIME1 field, DSC-TIME2 field, and as shown in table 1, preserve DSC monitoring time in setting regions.
Wherein, anchor point 1, anchor point 2, anchor point 3 and anchor point 4 have consisted of 4 points of a blocked areas, the interior DSC monitoring in the zone start and end time that DSC-TIME1, DSC-TIME2 indication is determined by anchor point 1, anchor point 2, anchor point 3 and 4 four points of anchor point.During the DSC area monitoring, segment table can independently be preserved the DSC monitoring time in a plurality of zones, 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 the DSC monitoring, at first checks the GPS state, checks its whether effective location, if effective location just can carry out follow-up deterministic process; Secondly, effectively work as the prelocalization longitude and latitude according to GPS, judge in the zone of 4 points (GPS1 field, GPS2 field, GPS3 field, the GPS4 field contents) delimitation whether terminal location records in DSC monitoring period of time table, if the DSC-TIME1 field, DSC-TIME2 field contents that read this record as DSC monitoring start time and concluding time, otherwise adopt start time and the concluding time of acquiescence, as start time and the concluding time of DSC monitoring; Then, judge the current time whether within the start time and concluding time scope of DSC monitoring, if, illustrating needs to start the DSC monitoring, when starting the DSC monitoring, the free time, a TDMA that be not in the DSC monitoring state are switched to the DSC frequency range, enter the DSC monitoring state; If the current time, the TDMA receiver that will be in DSC frequency range listening state switched to the AIS frequency range not in DSC monitoring time scope.
Compared with prior art, the invention has the beneficial effects as follows: can realize the DSC function in the AIS terminal that does not configure the DSC receiver.
Purpose of the present invention, feature and advantage will and be elaborated by reference to the accompanying drawings by embodiment.
Description of drawings
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 the GPS module, and U5 is reset circuit, and U6 is the modulation /demodulation module, and U7 is power detection module, U8 is transmission channel, and U9 is TMDA receiving cable 1, and U10 is TDMA receiving cable 2, and U11 is transmit receive antenna; U1 is connected with U2, U3, U4, U5, U6, U7, and U6 is connected with U8, U9, U10, U1, and U11 is connected with U8, U9, U10, and U7 is connected with U8, U1.
In order to further illustrate concrete enforcement of the present invention, in conjunction with Fig. 1, process flow diagram shown in Figure 2, this method is made specific implementation process describe, comprise the following steps:
Step 101:DSC monitoring judgement beginning, then execution in step 102;
Step 102: judge whether gps data is effective, effectively, execution in step 103, otherwise execution in step 107;
Step 103: judge the Current GPS position whether in the zone of 4 somes appointment in [segment table during the DSC area monitoring] record, the zone of record can be a plurality of; If in regional extent, execution in step 105 therein, otherwise execution in step 104;
Step 104: read DSC-TIME1, the DSC-TIME2 of GPS region in [segment table during the DSC area monitoring] as start time and the concluding time of DSC monitoring, then execution in step 106;
Step 105: read acquiescence start time and concluding time as start time and the concluding time of DSC monitoring, then execution in step 106;
Step 106: the current time, within the start time and concluding time scope of DSC monitoring, if in this time range, execution in step 109, otherwise execution in step 107;
Step 107: whether current have TDMA receiver enter DSC monitoring state, if having, execution in step 108 if judging, otherwise execution in step 112;
Step 108: DSC frequency range TDMA receiver is switched back the setting of AIS frequency range withdraw from the DSC monitoring state, execution in step 112;
Step 109: whether current have TDMA receiver enter DSC monitoring state, if having, execution in step 111 if judging, otherwise execution in step 110;
Step 110: switch one of idle TDMA receiver to the DSC frequency range, arrange and enter the DSC monitoring state, then execution in step 112;
Step 111: judge whether the DSC monitoring arrives the concluding time, if arrive, execution in step 108, otherwise execution in step 112;
Step 112:DSC monitors end.
Step 201:DSC message is processed beginning, and then execution in step 202;
Step 202: the DSC message of accepting is carried out phasing, checking treatment, and then execution in step 203;
Step 203: judge whether DSC message format, verification be correct, if correct, execution in step 204, otherwise execution in step 214;
Step 204: according to contents such as this DSC message function code, format characters, whether judge this message for the calling message of specifying the marine site, if so, execution in step 208, otherwise execution in step 205;
Step 205: judge this message whether for the calling of all AIS terminals, if so, execution in step 210, otherwise execution in step 206;
Step 206: whether judge this message for the calling of specifying the AIS terminal, if so, execution in step 207, otherwise execution in step 214;
Step 207: whether judge that this message calls out No. MMSI consistent with No. MMSI, this terminal, if unanimously, execution in step 210, otherwise execution in step 214;
Step 208: whether the GPS that judges this terminal locates effectively, if effectively, execution in step 209, otherwise execution in step 214;
Step 209: according to the effective location longitude and latitude of GPS, judge the terminal current location whether in specifying the marine site scope, if specifying the marine site, execution in step 210, otherwise execution in step 214;
Step 210: the DSC message content is further resolved, and then execution in step 211;
Step 211: further resolve the function code of acquisition according to the DSC message, whether the arbitration functions code is 104, and if so, execution in step 212, otherwise execution in step 214;
Step 212: extract corresponding configuration parameter according to the symbol of the Function Extension in the DSC message, then execution in step 213;
Step 213: the configuration parameter that preservation is extracted, and carry out the corresponding setting of revising, then execution in step 214;
The processing of step 214:DSC message finishes.
Although more than described the specific embodiment of the present invention; but being familiar with those skilled in the art should be appreciated that; our described specific embodiment is illustrative; rather than for limiting the scope of the invention; any equivalence that inspired by the technology of the present invention route to do is modified and changes, and all should be encompassed in the scope that claim of the present invention protects.
Claims (1)
1. the DSC control method based on AIS Class B terminal, be comprised 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 is connected with U2, U3, U4, U5, U6, U7, and U6 is connected with U8, U9, U10, U1, and U11 is connected with U8, U9, U10, U7 is connected with U8, U1, during control, the employing time is shared the method for TDMA channel, at first one of the free time in two TDMA receivers of terminal is arranged on the DSC channel; Secondly, the DSC data message that receives is carried out dissection process; Then, according to the dissection process result of message, the parameter of TDMA receiver is arranged, realizes the AIS channel management, it is characterized in that:
(1) described DSC control method, have DSC monitoring period of time table, by the GPS1 field, the GPS2 field, the GPS3 field, the GPS4 field, the DSC-TIME1 field, the DSC-TIME2 field forms, effectively work as the prelocalization longitude and latitude according to GPS, judge the GPS1 field whether terminal location records in DSC monitoring period of time table, the GPS2 field, the GPS3 field, in the zone that 4 points of GPS4 field contents delimited, if would read the DSC-TIME1 field of this record, the DSC-TIME2 field contents is as DSC monitoring start time and concluding time, otherwise adopt start time and the concluding time of acquiescence, as start time and the concluding time of DSC monitoring,
(2) described DSC control method when starting the DSC monitoring, switches to the DSC frequency range with the free time, a TDMA that be not in the DSC monitoring, enters the DSC monitoring state;
(3) described DSC control method, if the current time not in DSC monitoring time scope, the TDMA receiver that will be in DSC frequency range listening state switches to the AIS frequency range.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106949292A (en) * | 2016-01-07 | 2017-07-14 | 中核控制系统工程有限公司 | A kind of pneumatic control valve no-harass switch control method |
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| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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