【摘要】：隨著科學(xué)技術(shù)的快速發(fā)展,頻譜分析儀已經(jīng)成為了一種必不可少的頻域測(cè)量工具。它廣泛的運(yùn)用在通信測(cè)試,航空航天以及雷達(dá)導(dǎo)航等各個(gè)領(lǐng)域。為了滿足高端領(lǐng)域的測(cè)量測(cè)試需求,頻譜分析儀的測(cè)量精度逐步提高,測(cè)量速度不斷加快,使用方式越來(lái)越靈活,可用測(cè)量領(lǐng)域不斷擴(kuò)大。對(duì)于超外差式頻譜儀,射頻前端本振的好壞會(huì)直接影響到頻譜儀的性能。因此研究射頻前端本振對(duì)于進(jìn)一步提高頻譜儀測(cè)量性能有著非常重要的意義。本文以8GHz頻譜分析儀項(xiàng)目為背景,主要針對(duì)頻譜分析儀中YIG調(diào)諧振蕩器(YTO)的控制模塊進(jìn)行研究、設(shè)計(jì)。根據(jù)YTO本振在頻譜分析儀中的控制方式以及工作過(guò)程,本文主要完成YTO本振掃描非線性補(bǔ)償模塊、YTO本振掃描計(jì)數(shù)時(shí)鐘模塊以及YTO本振列表式掃描控制模塊的設(shè)計(jì),進(jìn)而實(shí)現(xiàn)論文的總體設(shè)計(jì)目標(biāo)。第一,YTO本振掃描非線性補(bǔ)償模塊的設(shè)計(jì)。結(jié)合8GHz頻譜儀中YTO跨波段掃描的特點(diǎn),通過(guò)實(shí)際測(cè)試獲取由YTO的非線性誤差而引起的頻譜儀的頻率誤差。根據(jù)掃描時(shí)間、掃描范圍以及掃描點(diǎn)數(shù)三個(gè)因素來(lái)建立數(shù)學(xué)模型并獲得補(bǔ)償算法。最后給出頻譜儀的補(bǔ)償前后效果圖以及誤差數(shù)據(jù)對(duì)比,并作出驗(yàn)證分析。第二,YTO本振掃描計(jì)數(shù)時(shí)鐘模塊的設(shè)計(jì)。針對(duì)目前8GHz頻譜分析儀中,YTO掃描時(shí)間不準(zhǔn)確的情況。設(shè)計(jì)實(shí)現(xiàn)靈活可調(diào)、準(zhǔn)確度高、穩(wěn)定性好的計(jì)數(shù)時(shí)鐘信號(hào),它能夠根據(jù)掃描時(shí)間的精度需求實(shí)時(shí)的、自動(dòng)的進(jìn)行調(diào)整。本文將采用直接數(shù)字合成技術(shù)。根據(jù)實(shí)際測(cè)試結(jié)果可以看出該時(shí)鐘信號(hào)能夠很好的提高YTO掃頻時(shí)掃描時(shí)間的準(zhǔn)確度。第三,YTO本振列表式掃描控制模塊的設(shè)計(jì)。在原有的8GHz頻譜的基礎(chǔ)之上增加頻譜儀的信號(hào)檢測(cè)功能,用于對(duì)已知的、可檢測(cè)范圍內(nèi)的信號(hào)進(jìn)行測(cè)量、分析。設(shè)計(jì)YTO列表式掃描的工作模式。本文主要完成了列表掃描的方案設(shè)計(jì),對(duì)該方案的各個(gè)子模塊進(jìn)行了分析并給出列表掃描硬件電路設(shè)計(jì),最后給出仿真測(cè)試結(jié)果以及實(shí)際測(cè)試結(jié)果。本文最終完成了YTO掃描本振控制模塊方案設(shè)計(jì)的總體目標(biāo)。通過(guò)對(duì)YTO本振掃描非線性頻率誤差進(jìn)行補(bǔ)償,使得頻譜儀在進(jìn)行信號(hào)測(cè)量時(shí),滿足測(cè)量范圍的準(zhǔn)確度低于±0.2%的設(shè)計(jì)要求;YTO本振掃描時(shí)間精度由0.1ms提高至0.002ms到1ms靈活可調(diào);實(shí)現(xiàn)YTO本振列表式掃描控制。
[Abstract]:With the rapid development of science and technology, spectrum analyzer has become an indispensable frequency domain measurement tool. It is widely used in communication testing, aerospace and radar navigation and other fields. In order to meet the needs of high-end measurement and testing, the measurement accuracy of spectrum analyzer has been gradually improved, the measurement speed has been accelerated, the way of use has become more and more flexible, and the field of available measurement has been expanded. For the superheterodyne spectrometer, the local oscillator of the RF front end will directly affect the performance of the spectrometer. Therefore, the study of RF front-end local oscillator is of great significance to further improve the measurement performance of spectrometer. Based on the 8GHz spectrum analyzer project, the control module of YIG tuned oscillator (YTO) in the spectrum analyzer is studied and designed in this paper. According to the control mode and working process of YTO local oscillator in spectrum analyzer, this paper mainly completes the design of YTO local oscillator scanning nonlinear compensation module, YTO local oscillator scanning counting clock module and YTO local oscillator list scanning control module. Then realize the overall design goal of the thesis. First, the design of YTO local oscillator scanning nonlinear compensation module. According to the characteristics of YTO cross-band scanning in 8GHz spectrometer, the frequency error caused by the nonlinear error of YTO is obtained by practical test. According to three factors, scanning time, scanning range and scanning number, the mathematical model is established and the compensation algorithm is obtained. Finally, the effect diagram and error data of the spectrometer before and after compensation are compared, and the verification analysis is made. Second, the design of YTO local oscillator scan counting clock module. Aiming at the inaccurate scanning time of YTO in current 8GHz spectrum analyzer. Design and implementation of flexible adjustable, high accuracy, good stability of the count clock signal, it can scan time according to the accuracy of the demand for real-time, automatic adjustment. Direct digital synthesis is used in this paper. According to the actual test results, it can be seen that the clock signal can improve the scanning time accuracy of YTO. Third, the design of YTO local oscillator list scan control module. On the basis of the original 8GHz spectrum, the signal detection function of the spectrometer is added to measure and analyze the known and detectable signals. Design the working mode of YTO list scan. In this paper, the scheme of list scan is designed, the sub-modules of the scheme are analyzed and the hardware circuit design of list scan is given. Finally, the simulation test results and the actual test results are given. In this paper, the overall goal of the scheme design of the YTO scan local oscillation control module is finally completed. By compensating the nonlinear frequency error of YTO local oscillator scanning, the accuracy of the measurement range is less than 鹵0.2% when the spectrometer is used for signal measurement. The scanning time precision of YTO local oscillator is improved from 0.1ms to 0.002ms to 1ms, and YTO local oscillator list scanning control is realized.
【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】：2014
【分類號(hào)】：TM935.21;TN752

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本文編號(hào)：2397694