基于ais船舶避碰數(shù)據(jù)采集系統(tǒng)設(shè)計

1、基于AIS的船舶避碰數(shù)據(jù)采集系統(tǒng)設(shè)計摘要：船舶自動識別系統(tǒng)(AutomaticIdentificationSystem，簡稱AIS)工作在海上VHF頻段，運用SOTDMA方式發(fā)射船舶數(shù)據(jù)，具有補充現(xiàn)有船舶導(dǎo)航存在的缺陷，減少船舶碰撞事故提高搜救遇險船舶的速度增強雷達，船舶交通管理系統(tǒng)VTS的功能。隨著全球經(jīng)濟的發(fā)展、國家之間交流的日益頻繁，航運業(yè)迎來了蓬勃發(fā)展的又一次高峰，航海技術(shù)的提高也越來越受到重視。上個世紀，VHF通信技術(shù)被廣泛地

2、應(yīng)用于船舶通信領(lǐng)域。雷達、ARPA具有識別船舶的功能但是由于它們自身的局限性而無法適應(yīng)現(xiàn)代航運安全的需求隨著計算機技術(shù)、數(shù)字通信技術(shù)以及網(wǎng)絡(luò)信息技術(shù)的飛速發(fā)展，AIS的技術(shù)基礎(chǔ)已經(jīng)形成，在航運界對助航設(shè)各的要求越來越高的情況下，船舶自動識別系統(tǒng)應(yīng)運而生。船舶自動識別系統(tǒng)首先被用于航海避碰。由于雷達特性的限制，以及不是所有的船都裝備有這個設(shè)備，因而它首先被用做為一種監(jiān)視與判斷碰撞的危險度的一種方式。獲得船舶自動識別系統(tǒng)發(fā)送的數(shù)據(jù)對于船舶避

3、碰非常重要。本文對AIS基本結(jié)構(gòu)、工作原理、技術(shù)特點、及其輸入輸出接口，輸出信息的幀封裝及解析原理等進行了解析。在此基礎(chǔ)上完成了AIS信息采集處理的系統(tǒng)設(shè)計。試驗表明所得到的AIS信息準確可靠。該項技術(shù)的研究，是AIS信息應(yīng)用系統(tǒng)研究的基礎(chǔ)。關(guān)鍵詞：船舶避碰AISVHFGPS數(shù)據(jù)采集Abstract:AISwksonthemarineVHFusetheSOTDMA(SelfganizedTimeDivisionMultipleAcces

4、s)datachainprotocoltotransferdataofships.TheAIScanhelpthelimitsofthecurrentservicesdecreasethecollidecaseofshipsimprovethevalueofthesafeactioninmarinemakethecontentoftheradartheVTSmestronger.Withthedevelopmentoftheeconom

5、yofinternationalthemecommunicationofthecountriesthenavigationgetsachancetohaveaboomingfuture.Thenavigationtechnologiesarememetobeemphasized.DuringthelastcenturytheVHF(VeryHighFrequency)communicationhasbeenappliedintheshi

6、pstransptationaswellasradarARPAalsocouldidentifyshipsinthemarine.Buttheycouldntadapttotheneedsofthemodernnavigationbecauseoftheirlimits.Therapiddevelopmentofthedigitalcommunicationstechnologycomputertechnologywaretechnol

7、ogysupptstheneededtechnologyofAIS(AutomaticIdentificationSystem).AstheaidingserviceofthenavigationAISisbntolivewillbestrongerstronger.AISisusedinnavigationprimarilyfcollisionavoidance.Duetothelimitationsofradioacteristic

8、sbecausenotallvesselsareequippedwithAISthesystemismeanttobeusedprimarilyasameansoflookouttodetermineriskofcollision。GettheinfmationoftheAisisimptantfcollisionavoidance.Thispaperintroducesthebasestructure、wkprinciple、tech

9、nicalIOptoftheAISalsopresentsAIS’sframeencapsulationfmatdecodingencapsulationmethod.BasedontheabovemethodthesoftwarewasdesignedftheinfmationcollectingprocessingfromAIS.TheexperimentshowedthattheAISinfmationobtainedthroug

10、hcollectingprocessinginthiswaywasaccuratereliable.StudyingonthesetechniquesisthebaseofstudyingtheAISinfmationapplicationsysterm..Keywds:collisionavoidanceAISVHFGPSdataAcquisition4.1嵌入式系統(tǒng)技術(shù)................................

11、...............................................................4.1.1嵌入式系統(tǒng)的組成.................................................................................4.1.2嵌入式操作系統(tǒng)的選擇................................................

12、.........................4.1.3嵌入式系統(tǒng)開發(fā)模式.............................................................................4.2基于S3C2410的ARM9硬件開發(fā)平臺.........................................................4.3基于S3C2410的ARM9軟件開發(fā)流程.

13、........................................................4.4GMSK基帶信號的解調(diào)設(shè)計...........................................................................4.4.1GMSK的理論依據(jù)...........................................................

14、......................4.4.2GMSK基帶解調(diào).....................................................................................4.5AIS系統(tǒng)中的同步........................................................................................

15、....4.5.1AIS系統(tǒng)的同步.......................................................................................4.5.2AIS系統(tǒng)的同步技術(shù)分析.......................................................................4.5.3AIS系統(tǒng)的同步設(shè)計.............

16、..................................................................第5章系統(tǒng)軟件設(shè)計仿真與解碼顯示...............................................................................5.1AIS接收機的軟件設(shè)計.............................................

17、.......................................5.1.1AIS數(shù)據(jù)的提取及解包...................................................................5.1.2AIS數(shù)據(jù)檢測、重新打包及輸出...........................................................5.2GMSK基帶信號的仿真.....

18、..............................................................................5.3AIS的解碼與顯示............................................................................................5.3.1AIS信息的報文格式.......................

19、........................................................5.3.2AIS信息種類...........................................................................................5.3.3AIS解碼及顯示................................................