its智慧型運(yùn)輸系統(tǒng)(編輯修改稿)
2025-01-19 00:47 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 , MMWave ? For short and medium distances: Microwave GHz ? For long distances: GSM, UMTS ? CALM originated interfaces –ISO 21214 CALM InfraRed –ISO 21215 CALM M5 –ISO 21216 CALM Millimeter CALM originated interfaces ? This class of air interface has been specifically designed for CALM ? CALM originated interfaces should offer the highest performance interface at any particular frequency ? 5Ghz – GHz DSRC (dedicated short range munications) – The European Standard has been adopted and is now used in many countries including Australia, several countries in Asia and South America . ? Millimeter – Frequency range : 6263 GHz – High directionality – High data rates – It can also be used in conjunction with radar signals at similar frequencies. ? Infra red – Infra red is already used in tolling systems – High data rates and a relatively lightweight, paratively inexpensive, beacon infrastructure, with relatively high directionality. – The Standard supports current and future ITS applications with data rates from 1Mbit/s to 128Mbit/s ? The CALMIR medium provides virtually “continuous munications” even in the presence of interruptions of the link caused by physical barriers. ? Target domains of infrared are cartocar munication and directed munication to infrastructure facilities such as traffic signals, trafficsigns and informationbeacons. ? The link setuptime is usually less than one millisecond – important feature in safetyrelated cartocar munication ? Lowpower infrared beacons, in bination with solar panels, also enable also powerline independent roadside installation. CLAMIR application (German) ? German TruckTollingProject IR application Physical Transportation and Exchange of Data via oning traffic CurveWarning Traffic Information HazardWarning CALM IR Applications Communication Zones for CartoCar and CartoInfrastructure munication ? Protocol managed interfaces – ISO 21212 Cellular 2G – ISO 21213 Cellular 3G – Mobile Wireless Broadband (MWB) ? HCSDMA、 (WiMAX) and Protocol managed interfaces ? This class of air interface has not been specifically designed for CALM ? They are deigned for generic wireless telemunications session ? These interfaces are adopted as potential CALM interfaces because they have wide area, even ubiquitous, coverage. ? Cellular (2G) – The 2G cellular work is ubiquitous around most of the word – Applications tend to relate to non continuous, emergency systems – Examples of such systems are emergency buttons in vehicles that call the emergency services, and are based on 2G+GPS coordinates. ? Cellular (3G)
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