本文關(guān)鍵詞：X頻段寬帶小步進(jìn)接收機(jī)研究與設(shè)計(jì)　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 接收機(jī) 小步進(jìn) DDS PLL 寬帶

【摘要】：隨著現(xiàn)代通信機(jī)系統(tǒng)的快速發(fā)展,頻率資源日漸緊迫,射頻信道寸土寸金,這對(duì)現(xiàn)代接收機(jī)系統(tǒng)的性能提出了很高的要求;與此同時(shí),為保證在戰(zhàn)場(chǎng)復(fù)雜電磁環(huán)境下有效接收到通信信號(hào),作為雷達(dá)系統(tǒng)的專用接收機(jī),寬帶接收變頻功能已經(jīng)成為其最基本的設(shè)計(jì)要求;本論文圍繞上述兩點(diǎn)接收機(jī)研究過程中的核心問題,對(duì)一款工作在X頻段的雷達(dá)系統(tǒng)專用寬帶小步進(jìn)接收機(jī)進(jìn)行了詳細(xì)的分析與設(shè)計(jì)。為解決提高信道資源利用率問題,本論文所設(shè)計(jì)的接收機(jī)系統(tǒng)具備超小步進(jìn)接收功能,接收信號(hào)頻率步進(jìn)為0.0005Hz,論文中就接收機(jī)系統(tǒng)的這一優(yōu)勢(shì)功能進(jìn)行了詳細(xì)的分析設(shè)計(jì);通過對(duì)原有小步進(jìn)頻率源設(shè)計(jì)方案的分析和比較,綜合直接數(shù)字頻率合成方案(DDS)和鎖相環(huán)頻率合成方案(PLL),創(chuàng)新性的設(shè)計(jì)出一種“PLL+DDS+PLL”結(jié)構(gòu)的頻率源系統(tǒng),不僅實(shí)現(xiàn)了0.0005Hz的極小步進(jìn)功能,還具備優(yōu)秀的相位噪聲和雜散性能。多功能寬帶變頻接收是X頻段寬帶小步進(jìn)接收機(jī)的一大特點(diǎn),是本論文設(shè)計(jì)的另一個(gè)重點(diǎn)。論文中所設(shè)計(jì)接收機(jī)系統(tǒng)的寬帶變頻信道模塊不僅具備寬帶接收和寬帶中頻輸出功能,同時(shí)輸出中頻信號(hào)具有5MHz,10MHz,20MHz三種帶寬可選,增益模式可以在手動(dòng)增益控制(MGC)和自動(dòng)增益控制(AGC)間切換;整個(gè)變頻信道模塊功能豐富,可以滿足接收機(jī)系統(tǒng)在不同的環(huán)境下使用。為實(shí)現(xiàn)該寬帶變頻信道模塊,論文中使用ADS微波射頻仿真軟件對(duì)該模塊的各項(xiàng)指標(biāo)進(jìn)行了詳細(xì)的仿真和設(shè)計(jì),通過優(yōu)化器件選型和鏈路設(shè)計(jì)的方式,實(shí)現(xiàn)了該款寬帶變頻信道模塊。
[Abstract]:With the rapid development of modern communication system, frequency resources increasingly urgent, RF channel Cuntucunjin, which put forward a very high request to the modern receiver system performance; at the same time, in order to ensure the battlefield complex electromagnetic environment effectively received communication signal, the receiver as a special radar system, broadband frequency receiving function has become the the design of the most basic requirements; this paper focuses on the core issues of the two receivers in the research process, for a job in small private broadband radar system X band into the receiver are analyzed and designed in detail. To improve the utilization rate of channel resources, the receiver system designed in this paper have ultra small step signal receiving function, frequency step is 0.0005Hz, the advantage of this system is the receiver function for the detailed analysis and design; through the analysis and comparison of the original design scheme of frequency source into small, comprehensive and direct digital frequency synthesis scheme (DDS) and PLL frequency synthesis scheme (PLL), designed a frequency source system of a "PLL+DDS+PLL" structure of innovation, not only to achieve a very small step into 0.0005Hz functions, but also have excellent phase noise and spurious performance. Multi-function wideband frequency conversion receiving is a major feature of the X band wideband small step receiver. It is another key point in the design of this paper. Broadband frequency channel receiver module design of the system in the thesis not only have broadband receiver and broadband intermediate frequency output, while the output signal is 5MHz, 10MHz, 20MHz three kinds of bandwidth available, gain mode can be controlled in manual gain (MGC) and automatic gain control (AGC) switching frequency; the channel module function is rich, can meet the receiver system used in different environment. In order to realize the wideband frequency conversion channel module, the ADS microwave RF simulation software is used to simulate and design the index of the module in detail, and the broadband frequency conversion channel module is realized by optimizing the device selection and link design.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN851

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