一種無(wú)線數(shù)據(jù)采集和傳輸系統(tǒng)的設(shè)計(jì)-外文翻譯-其他專(zhuān)業(yè)-在線瀏覽
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【正文】 與遠(yuǎn)距離無(wú)線通信網(wǎng)絡(luò)相比，它們的不同之處在于基本結(jié)構(gòu)，應(yīng)用水平，服務(wù)范圍和業(yè)務(wù)（數(shù)據(jù)，語(yǔ)音）。短距離無(wú)線通信網(wǎng)絡(luò)最主要的優(yōu)勢(shì)是更低的成本和更靈活的應(yīng)用。 文章剩余部分由如下內(nèi)容組成： 在第二部分，我們描述了無(wú)線數(shù)據(jù)采集和傳輸系統(tǒng)的通用模塊圖表，第三部分，我們分析此系統(tǒng)硬件設(shè)計(jì)的關(guān)鍵技術(shù)，第四部分，介紹系統(tǒng)的軟件設(shè)計(jì)，第五部分，展示系統(tǒng)的測(cè)試結(jié)果，最后我們?cè)诘诹糠株U述結(jié)論和進(jìn)一步的工 作。實(shí)際上，遠(yuǎn)程終端單元是一些在移動(dòng)過(guò)程中可互相通信的移動(dòng)電臺(tái)。 在下一部分，設(shè)計(jì)信息終端和控制中心的軟件和硬件上的一些關(guān)鍵部件。物理層的功能是通過(guò)建立電路和專(zhuān)用芯片組完成的。 3 系統(tǒng)硬件設(shè)計(jì) 為了設(shè)計(jì)，管理和更新的方便，一些硬件單元和節(jié)點(diǎn)根據(jù)它們的功能和電學(xué)特性被劃分成不同的模型。數(shù)據(jù)采集模塊以數(shù)字式溫度傳感器 DSl8B20監(jiān)測(cè)溫度參數(shù) ,并將監(jiān)測(cè)的溫度參數(shù)簡(jiǎn)單處理后通過(guò) nRF905無(wú)線模塊發(fā)送到接收端口。本設(shè)計(jì)給出其與 MSP430F449的接口電路設(shè)計(jì)和接收端通過(guò)電平轉(zhuǎn)換芯片 MAX3232與 PC機(jī)連接。通過(guò)相適應(yīng)的無(wú)線傳輸模塊和數(shù)據(jù)采集模塊控制軟件的操控 ,保證整個(gè)硬件系統(tǒng)的流暢運(yùn)作。 1．收發(fā)器和接收模塊 在數(shù)據(jù)發(fā)送過(guò)程中，數(shù)據(jù)包將被調(diào)制到高頻然后發(fā)送到目標(biāo)無(wú)線射頻傳輸模塊，接收過(guò)程中，高頻信號(hào)通過(guò)無(wú)線射頻接收模塊又被解調(diào)成原始數(shù)據(jù)包。NRF905可以通過(guò)印刷式天線接收無(wú)線射頻信號(hào)，但是為了提高接收機(jī)的靈敏度和抗干擾能力，這種模塊也適用外部天線和濾波器電路。 模塊的關(guān)鍵部件 MCU是 51系列單片機(jī)，考慮到工業(yè)功能， WINBOND 78LE546因其在 8位 CMOS微處理器里較好的容量特性被而被應(yīng)用，與 電， 256比特嵌入式 RAM， 16KB Flash EPROM以及 64KB地址空間，四個(gè) 8位標(biāo)準(zhǔn)I/O接口，一個(gè)標(biāo)準(zhǔn) I/O雙串行口相兼容。它的引腳通過(guò)與 VCC相連受到保護(hù)并保持器穩(wěn)定性。 4 系統(tǒng)軟件設(shè)計(jì) 系統(tǒng)性能的真實(shí)取決于其有效性和合理的軟件控制。整個(gè)網(wǎng)絡(luò)由一個(gè)主機(jī)和許多分散的終端組成，每個(gè)終端必須有一個(gè)無(wú)線收發(fā)節(jié)點(diǎn)（此系統(tǒng)支持 Nrf905單片無(wú)線收發(fā)器），整個(gè)無(wú)線網(wǎng)絡(luò)的任何節(jié)點(diǎn)都有一個(gè)唯一認(rèn)證地址對(duì)應(yīng)一個(gè)唯一認(rèn)證終端。 為了提高系統(tǒng)的穩(wěn)定性，協(xié)議被設(shè)置成停止 等待模式。接著，每一次傳輸都要等待接收方的回應(yīng)。當(dāng)所有數(shù)據(jù)傳輸完后，數(shù)據(jù)源將發(fā)送一個(gè)釋放信道請(qǐng)求，當(dāng)收到接收方的響應(yīng)后傳輸結(jié)束。接下來(lái)，保存數(shù)據(jù)且發(fā)送一個(gè)響應(yīng)來(lái)結(jié)束整個(gè)過(guò)程。 閉環(huán)測(cè)試電路是通過(guò) PC帶雙串口以及兩個(gè) RS32口和通信節(jié)點(diǎn) A和 B建立起來(lái)的。數(shù)據(jù)通過(guò) PC的串口 A， RS32口發(fā)送，然后數(shù)據(jù)緩沖，最后成功到達(dá)終端無(wú)線收發(fā)器模塊。在本論文中，根據(jù)以收發(fā)器 nRF905和 51系列單片機(jī)作為核心硬件的原理設(shè)計(jì)一個(gè)低功耗高性能的無(wú)線數(shù)據(jù)通信系統(tǒng)。我們相信在軟件設(shè)計(jì)進(jìn)一步精煉和提高以后 集成和智能通信協(xié)議將會(huì)實(shí)現(xiàn)。在接下來(lái)的部分，通過(guò)分析來(lái)自 MOSI/SCK和 MISO/SCK的信息來(lái)驗(yàn)證系統(tǒng)的正確性。提出無(wú)線數(shù)據(jù)通信一個(gè)可行的解決方案，這個(gè)解決方案適合于強(qiáng)大的實(shí)時(shí)響應(yīng)，高可靠性要求和小數(shù)據(jù)量，被廣泛的應(yīng)用于各種領(lǐng)域，例如數(shù)據(jù)通信，環(huán)境監(jiān)測(cè)和安全保衛(wèi)系統(tǒng)。 5 The Design of a Wireless Data Acquisition and Transmission System Abstract—In the field of modern wireless munication, there are mainly some technologies that provide solutions to the wireless data transmission work, such as: GSM, CDMA, 3G, solutions make work work with high efficiency and good quality, but still with high cost. So it was difficulty in popularizing in with low cost and at the circumstance of infrastureless or infrastructure destruction. According to this situation, in this paper, the key ponents of the Information Terminal and the wireless receiving modules on the data collection and wireless transmission work were designed with the principle of transceiver nRF905 and 51 series of singlechip puter as the core hardware, besides, bining with the current technology on the Wireless Ad Hoc Networks,a shortrang wireless data sampling and transmission work was putting up,which provides a lowpowered and highperformance wireless data munication system, works in the ISM (Industrial Scientific Medical ),an available solution to the wireless data munications was put forward, and this solution was good at stronger realtime response, higher reliability requirement and smaller data amount. Through software and hardware debugging and actual measuring, this system based on our solution had work well, reached the expected goal and been already successfully applied to Wireless vehicle Terms—Ad Hoc Network。 transmission work. I. INTRODUCTION In modern wireless munication,GSM,CDMA, 3G, and WiFi bee the mainstream solution of wireless data transmission work because of their high speed and reliable quality. They also have the shortings of high cost, so wider application would cause a great waste of resources, and they cannot be promoted in small regional, low speed data shortrange wireless data collection and transmission work will be the best system supports the development of munication system of peertopeer, pointtomultipoint, and multipointtomultipoint. Shortrange wireless munication can adopt different work technologies, such as Bluetooth [1], [2],HomeR
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