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This package supports the parsing of AIS messages in Java. AIS, the Automatic Identification System, is a system aiming at improving maritime safety by exchanging messages between ships, other vehicles in particular aircraft involved in search-and-rescue (SAR), and (fixed) base stations. To be precise, this package support the ITU-R M.1371-4 AIS standard. See our extensive javadoc and in particular the class AISParser for more information on how to use this package. The parser was used in the Poseidon project, and is improved in the Metis project to better handle uncertain information. Both projects were led by the Embedded Systems Institute. In both projects Thales Nederlands was the carrying industrial partner, and multiple Dutch universities participated.

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package nl.esi.metis.aisparser.impl;

import nl.esi.metis.aisparser.AISMessage04;
import nl.esi.metis.aisparser.Sixbit;
import nl.esi.metis.aisparser.provenance.VDMMessageProvenance;
/** ESI AIS Parser
 * 
 * Copyright 2011/2012 by Pierre van de Laar (Embedded Systems Institute)
 * Copyright 2008 by Brian C. Lane 
 * All Rights Reserved
 * 
 * @author Pierre van de Laar
 * @author Brian C. Lane
 */


/** AIS Message 4 implementation: Base Station Report.
 *  * Field Nr     Field Name                          NrOf Bits   (from, to )
 * ------------------------------------------------------------------------
 *  1	messageID                        		       	   6	(   1,   6)
 *  2	repeatIndicator                         		   2	(   7,   8)
 *  3	userID                                  		  30	(   9,  38)
 *  4	utcYear                        		         	  14	(  39,  52)
 *  5	utcMonth                            	    	   4	(  53,  56)
 *  6	utcDay                                  		   5	(  57,  61)
 *  7	utcHour                                 		   5	(  62,  66)
 *  8	utcMinute                              		 	   6	(  67,  72)
 *  9	utcSecond                          	    	 	   6	(  73,  78)
 * 10	positionAccuracy                    	    	   1	(  79,  79)
 * 11	longitude                               		  28	(  80, 107)
 * 12	latitude                              		  	  27	( 108, 134)
 * 13	typeOfElectronicPositionFixingDevice    		   4	( 135, 138)
 * 14	transmissionControlForLongRangeBroadcastMessage	   1	( 139, 139)
 * 15	spare                                   	 	   9	( 140, 148)
 * 16	raimFlag                              		  	   1	( 149, 149)
 * 17	communicationState                      		  19	( 150, 168)
 *                                                      ---- +
 *                           (maximum) number of bits    168
 * 
 */
class AISMessage04Impl extends AISMessageUTCReportImpl implements AISMessage04 {
	/** AISMessage04 constructor
	 * @param content AIS content
	 * @param prov the provenance of the message
	 * @precondition validLength(content.length()) && AISMessageBase.getMessageId(content)== 4
	 */
	public AISMessage04Impl(Sixbit content, VDMMessageProvenance prov) {
		super(content, prov);
		assert(getMessageID() == 4);
	}
}