(1) Module working voltage: the working voltage of this terminal comes from the on-board battery, usually 12V or 24V, and the module voltage shall be less than the power supply voltage;

（2）通訊方式：可采用無線網(wǎng)絡(luò)和短信息方式通訊；

(2) Communication mode: wireless network and short message communication can be adopted;

（3）終端在線率：為了確保終端與監(jiān)控中心數(shù)據(jù)交流的實時性，終端應(yīng)保持高在線率；

(3) Terminal online rate: in order to ensure the real-time data exchange between the terminal and the monitoring center, the terminal shall maintain a high online rate;

（4）丟包率：丟包率是指測試中，所丟失數(shù)據(jù)包數(shù)量占所發(fā)送數(shù)據(jù)包的比率，為了降低數(shù)據(jù)丟包率，在設(shè)計中可以考慮，發(fā)生無線傳輸模塊不能連接網(wǎng)絡(luò)，導(dǎo)致終端不能登錄系統(tǒng)的情況時，待無線傳輸模塊脫離盲區(qū)后，將數(shù)據(jù)補(bǔ)傳服務(wù)器；

(4) Packet loss rate: the packet loss rate refers to the ratio of the number of lost packets to the transmitted packets during the test. In order to reduce the packet loss rate, it can be considered in the design that when the wireless transmission module cannot connect to the network, resulting in the terminal unable to log in to the system, the data will be transmitted to the server after the wireless transmission module leaves the blind area;

（5）定位精確度：車輛監(jiān)控調(diào)度系統(tǒng)的電子地圖精度數(shù)量級是米，我國二級道路的標(biāo)準(zhǔn)寬度為 30~60m，如果要對車輛進(jìn)行準(zhǔn)確的監(jiān)控，定位精度需控制在30m 以內(nèi)，否則，當(dāng)兩條道路的距離過近時，就可能出現(xiàn)定位錯誤，即正在某條公路上行駛的車輛被定為在道路外或其它道路上。

(5) Positioning accuracy: the order of magnitude of the electronic map accuracy of the vehicle monitoring and dispatching system is meters. The standard width of China's secondary roads is 30 ~ 60m. If you want to accurately monitor the vehicles, the positioning accuracy needs to be controlled within 30m. Otherwise, positioning errors can occur when the distance between the two roads is too close, That is, a vehicle traveling on a highway is determined to be outside the road or on other roads.

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