本文選題：車聯(lián)網(wǎng)　切入點(diǎn)：射頻識別　出處：《吉林大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：車聯(lián)網(wǎng)是新興產(chǎn)業(yè)物聯(lián)網(wǎng)和智能汽車兩個(gè)領(lǐng)域的結(jié)合。把物聯(lián)網(wǎng)中的對象都變成車輛和道路上的設(shè)施時(shí)，就是車聯(lián)網(wǎng)。在最近的幾年，隨著物聯(lián)網(wǎng)的發(fā)展使得信息產(chǎn)業(yè)得到了巨大的發(fā)展，這使得車聯(lián)網(wǎng)也收到了各界的關(guān)注和支持。很多發(fā)達(dá)國家都已經(jīng)投入了巨大的金額用于研發(fā)車聯(lián)網(wǎng)通信。在中國，政府以及各個(gè)行業(yè)都很關(guān)注和支持車聯(lián)網(wǎng)。車載通信是車聯(lián)網(wǎng)最核心的技術(shù)，它具有如下關(guān)鍵的技術(shù)：射頻識別(RFID)技術(shù)，衛(wèi)星定位技術(shù)，云計(jì)算技術(shù)，智能技術(shù)等。在車聯(lián)網(wǎng)的主要關(guān)鍵技術(shù)中，本文重點(diǎn)研究了其中的RFID技術(shù)。RFID技術(shù)是近年來發(fā)展極為迅速的一種通過無線方式傳遞信息的非接觸式自動(dòng)識別技術(shù)，它是利用射頻信號通過空間耦合(交變磁場或電磁場)實(shí)現(xiàn)無接觸信息傳遞并通過所傳遞的信息達(dá)到識別目的的一項(xiàng)新技術(shù)，現(xiàn)階段對RFID技術(shù)無論是在理論還是實(shí)踐方面都發(fā)展的迅速。目前在理論和實(shí)際應(yīng)用方面都十分引人注目，比如：利用RFID的智能停車場引導(dǎo)系統(tǒng)和自動(dòng)泊車系統(tǒng)等。其中超高頻段(UHF)的RFID技術(shù)是國際上最先進(jìn)的自動(dòng)識別技術(shù)，它具有識別距離遠(yuǎn)、識別速度快、使用壽命長等特點(diǎn)，廣泛應(yīng)用于電子路牌、高速公路收費(fèi)、物流管理、產(chǎn)品跟蹤等。而隨著CMOS集成電路工藝的不斷成熟，，RFID讀寫器技術(shù)正朝著低成本、低功耗和高集成度的方向快速發(fā)展。閱讀器系統(tǒng)普遍采用零中頻結(jié)構(gòu)，成本低，易于集成，但是閱讀器在讀取標(biāo)簽時(shí)，所發(fā)射的連續(xù)載波信號被下混頻到零頻而轉(zhuǎn)變?yōu)橹绷餍盘�，�?yōu)勢可能會(huì)干擾有用信號，這樣的話，會(huì)使濾波器的截止頻率產(chǎn)生偏差，造成RFID運(yùn)行的不穩(wěn)定性。本文主要針對零中頻接收機(jī)系統(tǒng)的改進(jìn)研究，在對超高頻RFID系統(tǒng)相關(guān)理論和技術(shù)進(jìn)行深入分析的基礎(chǔ)上，根據(jù)ISO/IEC18000-6Type C型協(xié)議，對工作在UHF頻段的RFID系統(tǒng)的讀寫器進(jìn)行詳細(xì)分析。研究了系統(tǒng)的基本原理及其各個(gè)組成部分，并針對180006C標(biāo)準(zhǔn)協(xié)議的編碼和調(diào)制技術(shù)進(jìn)行了深入研究。 然后，結(jié)合車聯(lián)網(wǎng)的現(xiàn)狀和車聯(lián)網(wǎng)對RFID系統(tǒng)的需求。根據(jù)射頻識別技術(shù)的理論的實(shí)現(xiàn)技術(shù)，討論了UHF RFID讀寫器的發(fā)送、接收電路的實(shí)現(xiàn)，并進(jìn)行了部分發(fā)送和接收電路的信號仿真分析，重點(diǎn)討論了一種射頻前端電路，討論了電路的基本原理和各個(gè)組成部分電路，對連續(xù)載波信號反饋通到接收鏈路，使后級模塊出現(xiàn)飽和的原因進(jìn)行了分析。然后研究了零中頻接收系統(tǒng)的直流偏移消除電路和頻率校準(zhǔn)的可行性方案，研究了對零中頻接收機(jī)的優(yōu)化方法。這些優(yōu)化方法可以有效地將有用信號篩選出來，并能在一定程度上抵制在室外電路工作環(huán)境的變化時(shí)濾波器截止頻率產(chǎn)生的偏差。
[Abstract]:Car networking is a combination of the emerging industry, the Internet of things, and the smart car. When you turn the object of the Internet of things into a vehicle and a facility on the road, it's a network of cars. In recent years, With the development of the Internet of things, the information industry has been greatly developed, which makes the car networking also receive attention and support from all walks of life. Many developed countries have already invested a huge amount of money in the development of vehicle networking communications. In China, The government and various industries pay close attention to and support vehicle networking. Vehicle communication is the core technology of vehicle networking. It has the following key technologies: radio frequency identification (RFID) technology, satellite positioning technology, cloud computing technology, etc. Among the key technologies of vehicle networking, this paper focuses on the research of RFID technology, which is a kind of non-contact automatic identification technology, which has been developing rapidly in recent years. It is a new technology that uses radio frequency signals to transmit contactless information through space coupling (alternating magnetic field or electromagnetic field) and to achieve the purpose of identification through the information transmitted. At present, RFID technology is developing rapidly in both theory and practice. For example, using the intelligent parking system and automatic parking system of RFID, the RFID technology of UHF is the most advanced automatic recognition technology in the world. It has the characteristics of long recognition distance, fast recognition speed, long service life, etc. Widely used in electronic road signs, highway charges, logistics management, product tracking, etc. With the continuous maturity of CMOS integrated circuit technology, RFID reader technology is moving towards low cost. Low power consumption and high integration are developing rapidly. Reader systems generally adopt zero-if structure, low cost, easy integration, but when reading tags, The transmitted continuous carrier signal is converted into a DC signal by submixing to zero frequency. The advantage may interfere with the useful signal, in which case, the cut-off frequency of the filter will be deviated. This paper focuses on the improvement of zero-intermediate frequency receiver system, based on the in-depth analysis of UHF RFID system theory and technology, according to the ISO/IEC18000-6Type C protocol, The reader of RFID system working in UHF band is analyzed in detail. The basic principle and components of the system are studied, and the coding and modulation techniques of 180006C standard protocol are deeply studied. Then, according to the current situation of vehicle networking and the requirement of vehicle networking to RFID system, according to the realization technology of RFID theory, the realization of UHF RFID reader and receiver circuit is discussed. A RF front-end circuit is discussed in detail. The basic principle of the circuit and each component circuit are discussed. The continuous carrier signal is fed back to the receiving link. The reason of saturation in the later stage module is analyzed. Then, the feasibility scheme of DC offset elimination circuit and frequency calibration of zero-intermediate frequency receiving system is studied. The optimization methods of zero if receiver are studied. These optimization methods can effectively filter out useful signals and to some extent resist the deviation of filter cutoff frequency when the operating environment of outdoor circuits changes.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U495;TP391.44

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