頻譜儀中YIG調(diào)諧振蕩器控制模塊的設計與實現(xiàn)
發(fā)布時間：2019-01-01 14:29
【摘要】：隨著科學技術的快速發(fā)展,頻譜分析儀已經(jīng)成為了一種必不可少的頻域測量工具。它廣泛的運用在通信測試,航空航天以及雷達導航等各個領域。為了滿足高端領域的測量測試需求,頻譜分析儀的測量精度逐步提高,測量速度不斷加快,使用方式越來越靈活,可用測量領域不斷擴大。對于超外差式頻譜儀,射頻前端本振的好壞會直接影響到頻譜儀的性能。因此研究射頻前端本振對于進一步提高頻譜儀測量性能有著非常重要的意義。本文以8GHz頻譜分析儀項目為背景,主要針對頻譜分析儀中YIG調(diào)諧振蕩器(YTO)的控制模塊進行研究、設計。根據(jù)YTO本振在頻譜分析儀中的控制方式以及工作過程,本文主要完成YTO本振掃描非線性補償模塊、YTO本振掃描計數(shù)時鐘模塊以及YTO本振列表式掃描控制模塊的設計,進而實現(xiàn)論文的總體設計目標。第一,YTO本振掃描非線性補償模塊的設計。結(jié)合8GHz頻譜儀中YTO跨波段掃描的特點,通過實際測試獲取由YTO的非線性誤差而引起的頻譜儀的頻率誤差。根據(jù)掃描時間、掃描范圍以及掃描點數(shù)三個因素來建立數(shù)學模型并獲得補償算法。最后給出頻譜儀的補償前后效果圖以及誤差數(shù)據(jù)對比,并作出驗證分析。第二,YTO本振掃描計數(shù)時鐘模塊的設計。針對目前8GHz頻譜分析儀中,YTO掃描時間不準確的情況。設計實現(xiàn)靈活可調(diào)、準確度高、穩(wěn)定性好的計數(shù)時鐘信號,它能夠根據(jù)掃描時間的精度需求實時的、自動的進行調(diào)整。本文將采用直接數(shù)字合成技術。根據(jù)實際測試結(jié)果可以看出該時鐘信號能夠很好的提高YTO掃頻時掃描時間的準確度。第三,YTO本振列表式掃描控制模塊的設計。在原有的8GHz頻譜的基礎之上增加頻譜儀的信號檢測功能,用于對已知的、可檢測范圍內(nèi)的信號進行測量、分析。設計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計,對該方案的各個子模塊進行了分析并給出列表掃描硬件電路設計,最后給出仿真測試結(jié)果以及實際測試結(jié)果。本文最終完成了YTO掃描本振控制模塊方案設計的總體目標。通過對YTO本振掃描非線性頻率誤差進行補償,使得頻譜儀在進行信號測量時,滿足測量范圍的準確度低于±0.2%的設計要求;YTO本振掃描時間精度由0.1ms提高至0.002ms到1ms靈活可調(diào);實現(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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM935.21;TN752
本文編號：2397694
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM935.21;TN752
【參考文獻】
相關期刊論文 前3條
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2 魏巖;;一種實用YTO驅(qū)動電路的改進設計[J];科技信息(科學教研);2007年24期
3 劉娜;劉盛;;幾種掃頻方案的比較[J];中國儀器儀表;2008年10期
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