3500/32-01-003500/32-01-00
3500/32-01-00
3500/32-01-00
智能交通系統(tǒng)是采用信息技術(shù),數(shù)據(jù)通信傳輸技術(shù),電子傳感技術(shù),計(jì)算機(jī)技術(shù)以及控制技術(shù)集成運(yùn)用于地面交通管理系統(tǒng),簡稱ITS。智能交通能夠有效的利用現(xiàn)有交通設(shè)施,提高交通效率,減少交通負(fù)載以及因交通而導(dǎo)致的環(huán)境污染,保證交通安全。利用智能交通管理系統(tǒng),管理人員能夠?qū)⒔煌髁空{(diào)控至最佳的狀態(tài),保證最大的社會(huì)效益和經(jīng)濟(jì)效益。
智能交通系統(tǒng)需要海量的數(shù)據(jù)需要交換傳輸,比如監(jiān)控?cái)z像頭的視頻圖像數(shù)據(jù),各種交通設(shè)施的控制信號(hào)數(shù)據(jù),還有交通監(jiān)控指揮的音頻數(shù)據(jù),這些數(shù)據(jù)需要通過數(shù)據(jù)傳輸線路傳輸至監(jiān)控中心進(jìn)行統(tǒng)一管理,監(jiān)控中心也需要將相關(guān)的數(shù)據(jù)傳輸至各個(gè)監(jiān)控現(xiàn)場節(jié)點(diǎn)進(jìn)行統(tǒng)一指揮。海量的數(shù)據(jù)交換則需要一個(gè)能夠承載高數(shù)據(jù)流量的數(shù)據(jù)實(shí)時(shí)傳輸系統(tǒng),RS-485總線以及普通的TCP/IP網(wǎng)絡(luò)并不能滿足高數(shù)據(jù)流量的需求。必須采用光纖與雙絞線相結(jié)合的工業(yè)以太網(wǎng)才可以滿足需求。
光纖通信由于其通信容量大,無干擾且保密性好,傳輸距離遠(yuǎn)廣泛的應(yīng)用于骨干網(wǎng)絡(luò)的通信,但是現(xiàn)在直接具備光纖接口的設(shè)備不多,并且光纖設(shè)備的接入網(wǎng)絡(luò)也相對(duì)比較困難,光纖的布線也很麻煩,而由于TCP/IP網(wǎng)絡(luò)的流行,具備了海量的網(wǎng)絡(luò)設(shè)備,直接具有TCP/IP網(wǎng)絡(luò)接口的設(shè)備在各行各業(yè)基本上都有了。而普通的以太網(wǎng)基于雙絞線傳輸,抗干擾能力相對(duì)較弱,實(shí)時(shí)性以及通信容量相對(duì)都比較差,而采用工業(yè)以太網(wǎng)交換機(jī)布設(shè)的工業(yè)以太網(wǎng)能夠滿足工業(yè)現(xiàn)場應(yīng)用,主干通信采用光纖進(jìn)行數(shù)據(jù)通信,工業(yè)交換機(jī)之間采用網(wǎng)絡(luò)管理保證通信的通暢以及降低網(wǎng)絡(luò)的沖突概率,保證實(shí)時(shí)性。
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