频谱仪中YIG调谐振荡器控制模块的设计与实现
发布时间：2019-01-01 14:29
【摘要】：随着科学技术的快速发展,频谱分析仪已经成为了一种必不可少的频域测量工具。它广泛的运用在通信测试,航空航天以及雷达导航等各个领域。为了满足高端领域的测量测试需求,频谱分析仪的测量精度逐步提高,测量速度不断加快,使用方式越来越灵活,可用测量领域不断扩大。对于超外差式频谱仪,射频前端本振的好坏会直接影响到频谱仪的性能。因此研究射频前端本振对于进一步提高频谱仪测量性能有着非常重要的意义。本文以8GHz频谱分析仪项目为背景,主要针对频谱分析仪中YIG调谐振荡器(YTO)的控制模块进行研究、设计。根据YTO本振在频谱分析仪中的控制方式以及工作过程,本文主要完成YTO本振扫描非线性补偿模块、YTO本振扫描计数时钟模块以及YTO本振列表式扫描控制模块的设计,进而实现论文的总体设计目标。第一,YTO本振扫描非线性补偿模块的设计。结合8GHz频谱仪中YTO跨波段扫描的特点,通过实际测试获取由YTO的非线性误差而引起的频谱仪的频率误差。根据扫描时间、扫描范围以及扫描点数三个因素来建立数学模型并获得补偿算法。最后给出频谱仪的补偿前后效果图以及误差数据对比,并作出验证分析。第二,YTO本振扫描计数时钟模块的设计。针对目前8GHz频谱分析仪中,YTO扫描时间不准确的情况。设计实现灵活可调、准确度高、稳定性好的计数时钟信号,它能够根据扫描时间的精度需求实时的、自动的进行调整。本文将采用直接数字合成技术。根据实际测试结果可以看出该时钟信号能够很好的提高YTO扫频时扫描时间的准确度。第三,YTO本振列表式扫描控制模块的设计。在原有的8GHz频谱的基础之上增加频谱仪的信号检测功能,用于对已知的、可检测范围内的信号进行测量、分析。设计YTO列表式扫描的工作模式。本文主要完成了列表扫描的方案设计,对该方案的各个子模块进行了分析并给出列表扫描硬件电路设计,最后给出仿真测试结果以及实际测试结果。本文最终完成了YTO扫描本振控制模块方案设计的总体目标。通过对YTO本振扫描非线性频率误差进行补偿,使得频谱仪在进行信号测量时,满足测量范围的准确度低于±0.2%的设计要求;YTO本振扫描时间精度由0.1ms提高至0.002ms到1ms灵活可调;实现YTO本振列表式扫描控制。
[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 卤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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935.21;TN752
本文编号：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 卤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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM935.21;TN752
【参考文献】
相关期刊论文 前3条
1 郭小文;;数字扫描在频谱分析仪中的设计与实现[J];科技信息(科学教研);2008年18期
2 魏岩;;一种实用YTO驱动电路的改进设计[J];科技信息(科学教研);2007年24期
3 刘娜;刘盛;;几种扫频方案的比较[J];中国仪器仪表;2008年10期
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