摘 要： 分析了目前車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" 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title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" 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title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)" title="車輛監(jiān)控系統(tǒng)">車輛監(jiān)控系統(tǒng)常用的VHF/UHF單信道呼叫網(wǎng)、集群移動(dòng)通信網(wǎng)的特點(diǎn)，以及GSM提供的幾種業(yè)務(wù),，進(jìn)而提出利用GSM的短消息業(yè)務(wù)來實(shí)現(xiàn)車輛監(jiān)控系統(tǒng)的方案,，設(shè)計(jì)了系統(tǒng)的結(jié)構(gòu)和組網(wǎng)方式，并指出系統(tǒng)的容量由短消息服務(wù)中心的處理能力和無線信令信道的承載能力決定,。
關(guān)鍵詞： 全球衛(wèi)星定位技術(shù)(GPS) GSM短消息業(yè)務(wù) 車輛監(jiān)控系統(tǒng)
1 車輛監(jiān)控系統(tǒng)
現(xiàn)代車輛監(jiān)控系統(tǒng)是一種集全球衛(wèi)星定位技術(shù)(GPS),、地理信息技術(shù)(GIS)和現(xiàn)代通信技術(shù)于一體的高科技系統(tǒng)。它將移動(dòng)目標(biāo)的動(dòng)態(tài)位置(經(jīng)度,、緯度),、時(shí)間、狀態(tài)等信息,，實(shí)時(shí)地通過無線通信鏈路傳送至監(jiān)控中心站,，而后在具有地理信息查詢功能的電子地圖上進(jìn)行移動(dòng)目標(biāo)運(yùn)動(dòng)軌跡的顯示，并對(duì)目標(biāo)的位置,、速度,、運(yùn)動(dòng)方向、車輛狀態(tài)等用戶感興趣的參數(shù)進(jìn)行監(jiān)控和查詢,。為調(diào)度管理提供可視化依據(jù),，特別適合公安、銀行,、保安,、機(jī)場等單位對(duì)某些特種車輛的監(jiān)控和調(diào)度管理。
車輛監(jiān)控系統(tǒng)的拓?fù)浣Y(jié)構(gòu)如圖1所示,，各移動(dòng)車輛的組成與功能完全相同,。
移動(dòng)車輛配備的GPS接收機(jī)用以獲取自己當(dāng)前的位置、時(shí)間等信息,，然后通過通信鏈路向監(jiān)控中心站發(fā)送狀態(tài)和位置等信息,；在監(jiān)控中心站，無線接收機(jī)接收各子站的位置信息,，并通過通信控制器送往電子地圖,，顯示各移動(dòng)車輛的運(yùn)行軌跡。系統(tǒng)由監(jiān)控軟件實(shí)現(xiàn)對(duì)各移動(dòng)車輛的狀態(tài)監(jiān)控,，并可利用無線通信對(duì)各移動(dòng)車輛進(jìn)行調(diào)度指揮,，這樣就實(shí)現(xiàn)了對(duì)各移動(dòng)車輛的監(jiān)控管理。
根據(jù)目前我國移動(dòng)通信的現(xiàn)狀,，組建車輛監(jiān)控系統(tǒng)一般利用現(xiàn)有的具有數(shù)據(jù)傳輸功能的通信系統(tǒng),，以降低成本，或利用不具備數(shù)據(jù)傳輸功能的模擬通信系統(tǒng),，對(duì)系統(tǒng)進(jìn)行一定的改造,，開發(fā)接口與控制電路,，采用音頻調(diào)制解調(diào)器(MODEM)，把數(shù)據(jù)調(diào)制在模擬通信所能夠傳輸?shù)囊纛l帶寬內(nèi),，使之能夠用以傳輸數(shù)據(jù),。目前GPS車輛監(jiān)控系統(tǒng)常用的通信方案主要有：VHF/UHF單信道呼叫網(wǎng)、集群移動(dòng)通信網(wǎng),。VHF/UHF單信道呼叫網(wǎng)屬于早期的移動(dòng)通信方式,，用這種通信網(wǎng)實(shí)現(xiàn)的車輛監(jiān)控系統(tǒng)各移動(dòng)車臺(tái)可采用時(shí)分多路(TDMA)方式來避免不同車輛之間的相互干擾，保證移動(dòng)車臺(tái)與監(jiān)控中心站之間的正常通信,，各移動(dòng)車臺(tái)按照事先規(guī)定好的時(shí)隙向監(jiān)控中心站發(fā)送定位信息,，監(jiān)控中心站可以將調(diào)度命令在某一固定的時(shí)隙發(fā)送給移動(dòng)臺(tái)。監(jiān)控系統(tǒng)的容量由每臺(tái)車發(fā)送信息占用的時(shí)間和發(fā)送定位信息的頻度來決定,，目前一個(gè)頻率點(diǎn)可以監(jiān)控約120臺(tái)車,。集群通信系統(tǒng)(Trunk Mobile Radio System)是專用調(diào)度通信系統(tǒng)，是共享頻率資源,、分擔(dān)費(fèi)用,、共享信道資源、改善服務(wù)的多用途,、高效能的無線調(diào)度系統(tǒng),。集群移動(dòng)通信系統(tǒng)多樣化的呼叫方式如群呼、組呼等加強(qiáng)了控制中心對(duì)車輛的調(diào)度能力,?；诩合到y(tǒng)的車輛監(jiān)控系統(tǒng)也有與單信道呼叫網(wǎng)相似的缺點(diǎn)。由于集群系統(tǒng)屬于專用移動(dòng)通信網(wǎng),，因此集群網(wǎng)的覆蓋范圍一般不大,，容量也不可能太大，這就限制了車輛監(jiān)控的范圍,，不能滿足大范圍車輛監(jiān)控系統(tǒng)的需要；而且由于集群系統(tǒng)一般采用大區(qū)制,，通信受多徑干擾以及通信盲區(qū)的問題依然不能改善,，數(shù)據(jù)通信質(zhì)量較差。
若出租汽車管理局建立了這樣的車輛監(jiān)控系統(tǒng),，就可以根據(jù)電子地圖上動(dòng)態(tài)顯示的出租車的位置,，準(zhǔn)確地指揮、調(diào)度,，以響應(yīng)用戶的服務(wù),。同樣，此系統(tǒng)也非常適用于公安部門110指揮中心,、銀行押款車等,。
2 基于GSM短消息業(yè)務(wù)的車輛監(jiān)控系統(tǒng)設(shè)計(jì)
GSM(Global System for Mobile communication) 系統(tǒng)是目前基于時(shí)分多址技術(shù)的移動(dòng)通信體制中最成熟,、最完善、應(yīng)用最廣的一種系統(tǒng),。我國目前已建成了覆蓋全國的GSM數(shù)字蜂窩移動(dòng)通信網(wǎng),，是我國公眾陸地移動(dòng)通信網(wǎng)的主要方式。它提供多種業(yè)務(wù),，主要有話音業(yè)務(wù),、短消息業(yè)務(wù)、數(shù)據(jù)業(yè)務(wù)等,，選擇那一種業(yè)務(wù)傳送GPS車輛定位數(shù)據(jù)對(duì)整個(gè)系統(tǒng)的性能有很大的關(guān)系,。
2.1 車輛監(jiān)控系統(tǒng)通信組網(wǎng)的GSM業(yè)務(wù)選擇
GSM的最基本的業(yè)務(wù)是話音業(yè)務(wù)，根據(jù)以前在集群電臺(tái)傳輸GPS數(shù)據(jù)的經(jīng)驗(yàn),，GPS數(shù)據(jù)通過音頻調(diào)制解調(diào)器轉(zhuǎn)換成3.1kHz音頻信號(hào),，加到移動(dòng)臺(tái)的音頻輸入來實(shí)現(xiàn)數(shù)據(jù)傳輸。但由于GSM是數(shù)字移動(dòng)通信系統(tǒng),，這樣既不需要也不可行,，首先是GSM本來就具有數(shù)據(jù)傳輸能力，提供數(shù)據(jù)業(yè)務(wù),；再者,，音頻調(diào)制解調(diào)器輸出的高端頻率一般都在2.0kHz以上，若這樣的信號(hào)加在GSM移動(dòng)終端的音頻接口上,，大于1300Hz的信號(hào)將有較大的失真從而導(dǎo)致接收端音頻調(diào)制解調(diào)器不能夠正確解調(diào)出音頻信號(hào)所攜帶的數(shù)據(jù),。測(cè)試表明，在話音通帶上用符合CCITT V.23建議的1200bit/s的調(diào)制解調(diào)器傳輸數(shù)據(jù),，其工作是不能令人滿意的,。而根據(jù)CCITT V.21建議(300bit/s)的話音通帶數(shù)據(jù)，傳輸性能不會(huì)嚴(yán)重下降,，但這樣的速率是不能為車輛監(jiān)控系統(tǒng)用戶所接受的,。因此，音頻調(diào)制解調(diào)的方式不可用,。
第二種選擇是數(shù)據(jù)業(yè)務(wù),，GSM提供2400bps、4800bps,、9600bps的異步數(shù)據(jù)傳輸能力,，可用于傳輸GPS定位數(shù)據(jù)。但GSM是公眾網(wǎng),，其業(yè)務(wù)的使用需要通過撥號(hào)建立連接,，一旦建立連接即需要計(jì)費(fèi)。目前中國電信GSM的最小計(jì)費(fèi)時(shí)間是1分鐘,，GPS每次的定位數(shù)據(jù)不到20字節(jié),，采用效率為50%的編碼方式也不到40個(gè)字節(jié),，若按9600bps的速率，傳輸一次GPS位置數(shù)據(jù)的時(shí)間大約0.04s,。而計(jì)費(fèi)按1分鐘計(jì),，加上撥號(hào)處理時(shí)延，用數(shù)據(jù)業(yè)務(wù)傳輸GPS定位數(shù)據(jù)是極不經(jīng)濟(jì)的,，若把一段時(shí)間的位置數(shù)據(jù)存儲(chǔ)起來,，當(dāng)調(diào)度中心需要時(shí)一起發(fā)送到中心站則是可行的?？梢赃x用GSM的數(shù)據(jù)業(yè)務(wù)作為查詢模式時(shí)的通信方案,。
第三種是短消息業(yè)務(wù)，GSM的短消息業(yè)務(wù)分為兩種：點(diǎn)對(duì)點(diǎn)短消息業(yè)務(wù)和短消息小區(qū)廣播業(yè)務(wù),，但目前短消息小區(qū)廣播業(yè)務(wù)還沒有開放,。點(diǎn)對(duì)點(diǎn)短消息業(yè)務(wù)能夠使GSM數(shù)字移動(dòng)通信網(wǎng)的用戶可以發(fā)出或接收長度有限(不超過140個(gè)字節(jié))的數(shù)字或文字消息，并且短消息的收發(fā)不影響通話,；短消息業(yè)務(wù)可以使網(wǎng)絡(luò)端知道被叫方是否已經(jīng)收到短消息,，如果傳送失敗，被叫方?jīng)]有回答確切消息,，網(wǎng)絡(luò)一側(cè)會(huì)保留所傳的消息,，一旦網(wǎng)絡(luò)發(fā)現(xiàn)被叫方能被叫通時(shí)，消息能被重發(fā)以確保被叫方能收到,。
GSM的短消息業(yè)務(wù)利用信令信道傳輸,，是GSM通信網(wǎng)所特有的，它不用撥號(hào)建立連接,，直接把要發(fā)的信息加上目的地址發(fā)送到短消息服務(wù)中心,，由短消息服務(wù)中心再發(fā)送給最終的信宿，短消息每次限制在140個(gè)字節(jié)以內(nèi),，這對(duì)GPS定位數(shù)據(jù)來講足夠了,。短消息業(yè)務(wù)用于GPS車輛監(jiān)控最大的優(yōu)點(diǎn)在于其無需建立連接，服務(wù)費(fèi)用低(以北京電信目前的收費(fèi)標(biāo)準(zhǔn),，短消息每月收費(fèi)15元),，這適于把每次定位數(shù)據(jù)隨時(shí)發(fā)送到監(jiān)控中心。
綜上所述,，我們選用GSM的短消息業(yè)務(wù)來實(shí)現(xiàn)GPS車輛監(jiān)控。
2.2 通信組網(wǎng)方案設(shè)計(jì)
監(jiān)控中心站通過GSM通信網(wǎng)與移動(dòng)中的車輛進(jìn)行通話,、短消息傳輸,。接收短消息可用GSM用戶終端(如手機(jī)，車載臺(tái)),，也可以用ISDN方式直接連接到移動(dòng)通信局的短消息服務(wù)中心,，這樣接收短消息更迅捷,，系統(tǒng)容量可以更大。
用GSM實(shí)現(xiàn)自動(dòng)車輛監(jiān)控系統(tǒng)中心站的原理框圖如圖2,。
移動(dòng)站由GSM移動(dòng)終端(手機(jī)或車載臺(tái)),、GPS接收機(jī)和控制處理單元組成。其框圖如圖3所示,。
控制單元功能包括接收GPS定位數(shù)據(jù),、與GSM移動(dòng)臺(tái)接口、控制移動(dòng)臺(tái)自動(dòng)撥號(hào)和自動(dòng)收發(fā)數(shù)據(jù),、收發(fā)短消息,、顯示車輛位置、自動(dòng)/人工報(bào)警,、遙控制動(dòng)汽車等,。報(bào)警主要用于車輛故障或特殊情況下使用。報(bào)警時(shí)可報(bào)告車輛編號(hào),、狀況,、位置等信息，監(jiān)控中心收到報(bào)警信息后可遙控該車熄火,，致使報(bào)警車輛不能離開出事地點(diǎn),。
GPS接收機(jī)用來接收GPS衛(wèi)星發(fā)來的信號(hào)并解算出定位信息，由控制單元讀取,、顯示,、并通過GSM送達(dá)監(jiān)控中心。
移動(dòng)終端提供話音,、短消息業(yè)務(wù),，控制單元可以向移動(dòng)終端發(fā)送撥號(hào)等控制命令以溝通話音、收發(fā)短消息,。車上控制單元把接收到的GPS定位數(shù)據(jù)通過GSM的短消息業(yè)務(wù)發(fā)送到中心站,。GSM的短消息可與通話同時(shí)進(jìn)行而互不影響。對(duì)一些特殊車輛需要實(shí)時(shí)監(jiān)控的,，可以用GSM的數(shù)據(jù)通信業(yè)務(wù),，GSM提供高達(dá)9600bps的數(shù)據(jù)傳輸速率，但費(fèi)用比短消息要高,。本系統(tǒng)采用短消息業(yè)務(wù)進(jìn)行定位數(shù)據(jù)傳送,，同時(shí)還可以通話。
2.3 性能分析
移動(dòng)用戶通過GSM網(wǎng)將短消息輸入至SC(短消息服務(wù)中心),，由SC通過MSC(移動(dòng)交換中心)將短消息發(fā)送至指定的移動(dòng)用戶,。移動(dòng)臺(tái)發(fā)送短消息至SC和SC將短消息發(fā)送至指定移動(dòng)用戶是兩個(gè)相同
的信令過程，只是方向相反,。其中影響流量的接口主要有兩個(gè)：MS(移動(dòng)臺(tái))與BSS(基站)之間的接口——Um接口(無線接口),、BSS與MSC之間的接口——A接口,。A接口采用7號(hào)信令的信號(hào)接續(xù)控制部分，其物理層連接采用PCM一次群(2.048Mb/s),，而Um接口的信道速率是270.83kb/s,，每時(shí)隙信道比特率是22.8kb/s。
以上分析,，基于GSM短消息業(yè)務(wù)的車輛監(jiān)控系統(tǒng)的容量主要由短消息服務(wù)中心的處理能力和無線信令信道的承載能力決定,。短消息處理中心的忙時(shí)處理能力一般在每秒120條信息以上(以大唐電信的SMC30短消息中心為例)，容量支持150萬用戶以上,，消息存儲(chǔ)時(shí)延小于1s(95%的概率),。
總之，基于已進(jìn)行的跑車實(shí)驗(yàn),，可以得出結(jié)論：GSM作為公用陸地移動(dòng)通信網(wǎng),，具有其他通信方式所不可比擬的優(yōu)越性，它通信范圍廣,、容量大,、提供數(shù)據(jù)業(yè)務(wù)，短消息業(yè)務(wù)經(jīng)濟(jì)實(shí)惠,，是車輛監(jiān)控系統(tǒng)比較好的一種數(shù)據(jù)傳輸方式,。但它的調(diào)度管理功能比較弱，可以通過監(jiān)控中心站的管理軟件來加強(qiáng),。
參考文獻(xiàn)
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