本文關(guān)鍵詞：無線特高頻電臺設(shè)計與實現(xiàn)　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 特高頻 收發(fā)機(jī) 數(shù)字信號處理平臺 FPGA 阻抗匹配

【摘要】：隨著時代的變遷,技術(shù)的發(fā)展,以及戰(zhàn)場環(huán)境的變化,特高頻通信因為其在抗干擾、通信距離、保密性等方面的優(yōu)勢,在軍事通信系統(tǒng)中應(yīng)用愈來愈廣泛。收發(fā)信機(jī)是通信的物理基礎(chǔ),它直接決定了通信的質(zhì)量,從而決定了整個通信系統(tǒng)的性能。本文的主要工作就是圍繞特高頻電臺做了系統(tǒng)的研究,主要的成果為:1.設(shè)計了一套采用中頻采樣,一次模擬下變頻的接收機(jī)。針對系統(tǒng)對帶寬、接收機(jī)靈敏度、成本、調(diào)制解調(diào)方式和信號處理流程的要求,提出了采用中頻采樣,一次模擬下變頻的結(jié)構(gòu)。合理分配射頻、中頻和基帶的增益,再通過自動增益控制方式,極大的增加了系統(tǒng)的動態(tài)范圍。設(shè)計前端低噪聲放大器,優(yōu)化通道,有效降低了系統(tǒng)的噪聲系數(shù),提高了系統(tǒng)的靈敏度和線性范圍。2.設(shè)計了一套直接上變頻的發(fā)信機(jī)。設(shè)計實現(xiàn)了一種雙通道、正交調(diào)制上變頻的發(fā)信機(jī)。通過對輸出級前端功率放大器做阻抗匹配設(shè)計,最終可以實現(xiàn)輸出信號功率達(dá)到28dBm。3.針對射頻電路匹配問題做了研究。提出了一種利用ADS仿真軟件,配合實際測量和估算來做電路阻抗匹配的方法。通過對器件參數(shù)和測試環(huán)境的研究,獲取工作頻點時器件的輸入輸出阻抗值,再根據(jù)ADS的仿真工具,計算設(shè)計匹配網(wǎng)絡(luò),通過實驗測試,效果良好。4.對前端可調(diào)諧的帶通濾波器做了研究。提出了一種利用變?nèi)荻䴓O管和高Q值電感搭建的電調(diào)諧帶通濾波器設(shè)計。通過對其做ADS理論仿真,性能良好,帶內(nèi)插損較小,帶外衰減達(dá)到40dB。5.設(shè)計一套基于EP3C55F484C8的數(shù)字信號處理平臺。數(shù)字信號處理平臺可完成數(shù)字調(diào)制解調(diào),以及電臺的控制,具備JTAG仿真接口,128位的通用IO,滿足對后續(xù)實驗的需求。最后組成完整的無線特高頻電臺實驗平臺,通過做相關(guān)的測試工作,平臺達(dá)到了設(shè)計要求。
[Abstract]:With the change of the times, the development of technology, and the battlefield environment changes, UHF Communication because of its communication in anti-interference, distance, confidentiality and other advantages, in military communication system has been widely used. The transceiver is the physical basis of communication, it directly determines the quality of communication, so as to determine the the performance of the whole communication system. The main work of this paper is to do systematic research on UHF radio, the main results are as follows: 1. to design a set of the intermediate frequency sampling, frequency receiver simulation of the system. According to the bandwidth, receiver sensitivity, cost, modulation and demodulation and signal processing requirements. The intermediate frequency sampling, simulation of the frequency structure. The rational allocation of radio frequency, intermediate frequency and baseband gain, then automatic gain control, greatly increasing the dynamic range of the system. The design of front end Low noise amplifier, channel optimization, reduce the noise coefficient of the system, a set of direct conversion transmitter design improves the sensitivity and linear range of.2. system. The design and implementation of a dual channel, orthogonal frequency modulation transmitter. The output stage power amplifier front-end do impedance matching design, finally can achieve the output signal power is 28dBm.3., aiming at the problem of RF circuit is studied. A method is proposed which uses ADS simulation software, combined with the actual measurement and estimation methods to do circuit impedance matching. Through the research on device parameters and test environment, obtain the working frequency when the input and output impedance of the device according to the value of simulation tools ADS, design and calculation of the matching network, through the experimental test, good effect of.4. on the front end of the tunable bandpass filter is studied. A varactor diode and two Inductance built electrically tunable bandpass filter with high Q value. Through simulation, ADS theory for its good performance, with less insert loss, band attenuation reached 40dB.5. design a digital signal processing platform based on EP3C55F484C8. The digital signal processing platform can complete the digital modulation and demodulation, and radio control, with JTAG simulation interface, universal IO 128, to meet the needs of the subsequent experiments. Finally, the wireless UHF radio experimental platform is complete, the related test work platform, meet the design requirements.

【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN924

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 趙允平;一種DMR數(shù)字端機(jī)的射頻模塊研究與實現(xiàn)[D];西安電子科技大學(xué);2011年

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本文編號：1423655