【摘要】：當(dāng)前我國(guó)城市交通面臨著巨大壓力，導(dǎo)致交通管理難度增大，交通現(xiàn)狀急需改變。改變交通現(xiàn)狀的首要前提就是要能夠及時(shí)掌握實(shí)時(shí)交通信息，無(wú)線車檢器在十字路口處采集車流量、車輛占有時(shí)間等交通數(shù)據(jù)，能夠及時(shí)掌握實(shí)時(shí)交通信息。在無(wú)線車檢器中，接收機(jī)設(shè)備接收來(lái)自傳感器節(jié)點(diǎn)的原始數(shù)據(jù)包，并對(duì)數(shù)據(jù)包解析，，將分析得出的交通信息發(fā)送至控制中心，給控制中心提供重要的數(shù)據(jù)源。所以設(shè)計(jì)一套能夠精確并且穩(wěn)定工作的接收機(jī)設(shè)備就顯得尤為重要。 接收機(jī)的設(shè)計(jì)重點(diǎn)是精確接收來(lái)自傳感器節(jié)點(diǎn)組的數(shù)據(jù)并對(duì)數(shù)據(jù)解析，接收機(jī)與傳感器節(jié)點(diǎn)組之間的數(shù)據(jù)傳輸方式采用無(wú)線傳輸，在保證數(shù)據(jù)傳輸精確的前提下，減少了接收機(jī)在實(shí)際環(huán)境中安裝調(diào)試的工作量；接收機(jī)采用單片機(jī)作為核心控制器，滿足系統(tǒng)對(duì)控制器的計(jì)算量要求；考慮到接收機(jī)與控制中心之間的實(shí)際距離較遠(yuǎn)，為了降低誤碼率，接收機(jī)與控制中心之間的數(shù)據(jù)傳輸方式采用有線方式。 為了保證接收機(jī)的穩(wěn)定工作，需要設(shè)計(jì)配套的測(cè)試設(shè)備對(duì)接收機(jī)進(jìn)行各種條件下的測(cè)試。忽略接收機(jī)內(nèi)部功能結(jié)構(gòu)，接收機(jī)的輸入為傳感器節(jié)點(diǎn)組發(fā)送的數(shù)據(jù)包，輸出為向控制中心發(fā)送的數(shù)據(jù)包。測(cè)試設(shè)備模擬傳感器節(jié)點(diǎn)組發(fā)送數(shù)據(jù)包作為接收機(jī)的輸入，并將接收機(jī)的實(shí)際輸出與期望輸出做比對(duì)，判斷接收機(jī)是否合格。 從硬件功能和軟件功能兩個(gè)主要的方面進(jìn)行系統(tǒng)方案設(shè)計(jì)，并完成實(shí)現(xiàn)接收機(jī)和接收機(jī)測(cè)試設(shè)備；將設(shè)計(jì)完成的接收機(jī)和接收機(jī)測(cè)試設(shè)備進(jìn)行實(shí)際使用，接收機(jī)能夠接收來(lái)自傳感器節(jié)點(diǎn)的數(shù)據(jù)包并對(duì)數(shù)據(jù)包做出正確解析，測(cè)試設(shè)備能夠反映出接收機(jī)對(duì)數(shù)據(jù)包的識(shí)別、解析能力。
[Abstract]:At present, the urban traffic in our country is facing great pressure, which leads to the difficulty of traffic management, and the traffic situation needs to be changed urgently. The first premise to change the traffic situation is to be able to master the real-time traffic information in time, the wireless vehicle inspector can collect the traffic data such as traffic flow and vehicle occupation time at the crossing, and can master the real-time traffic information in time. In the wireless vehicle inspector, the receiver device receives the original data packet from the sensor node, and parses the packet, sends the analyzed traffic information to the control center, and provides the control center with an important data source. Therefore, it is particularly important to design a set of receiver equipment which can work accurately and stably. The design of the receiver focuses on the accurate reception of the data from the sensor node group and the analysis of the data. The data transmission mode between the receiver and the sensor node group is wireless. On the premise of ensuring the accuracy of the data transmission, The workload of installing and debugging the receiver in the actual environment is reduced. The receiver uses single chip microcomputer as the core controller to meet the requirements of the system for the calculation of the controller. Considering the distance between the receiver and the control center, in order to reduce the bit error rate (BER), the data transmission mode between the receiver and the control center is wired. In order to ensure the stable operation of the receiver, it is necessary to design a supporting test equipment to test the receiver under various conditions. Ignoring the internal functional structure of the receiver, the input of the receiver is the packet sent by the sensor node group, and the output is the packet sent to the control center. The test equipment simulates the sensor node group to send packets as the input of the receiver, and compares the actual output of the receiver with the expected output to determine whether the receiver is qualified or not. The system scheme is designed from two main aspects of hardware function and software function, and the receiver and receiver test equipment are realized. The designed receiver and the receiver test equipment are used in practice. The receiver can receive the packet from the sensor node and analyze the packet correctly, and the test device can reflect the recognition of the packet by the receiver. Analytical ability.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN851;U495

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