CAJ | 학술논문

基于双混频时差测量原理,结合软件无线电的设计理念,设计数字式双混频时差测量系统模型,应用数学公式建模并推导相位差运算过程,在MATLAB环境下对频标信号和测量系统进行仿真实验,针对模数转换指标、数字鉴相方法和互相关算法提出关键技术解决方案。设计本底测量和比对测量实验方案,搭建数字式双混频时差实验设备,实验测量并计算分析实验数据。本底测量实验结果表明,实验设备秒稳本底指标优于5.0×10-13/1 s,达到国内领先水平。比对测量实验结果表明,实验设备测量结果与5120 A相近,其测量能力与测量性能优于频标比对设备PO7D-2和ST2002A。
기우쌍혼빈시차측량원리,결합연건무선전적설계이념,설계수자식쌍혼빈시차측량계통모형,응용수학공식건모병추도상위차운산과정,재MATLAB배경하대빈표신호화측량계통진행방진실험,침대모수전환지표、수자감상방법화호상관산법제출관건기술해결방안。설계본저측량화비대측량실험방안,탑건수자식쌍혼빈시차실험설비,실험측량병계산분석실험수거。본저측량실험결과표명,실험설비초은본저지표우우5.0×10-13/1 s,체도국내령선수평。비대측량실험결과표명,실험설비측량결과여5120 A상근,기측량능력여측량성능우우빈표비대설비PO7D-2화ST2002A。
Based on the measurement principle of Dual Mixer Time Difference (DMTD) and the design concept of software-defined radio, the theoretical model of digital DMTD measurement system was designed; the phase difference was deduced according to the digital DMTD mathematical model; the frequency standard signals and measurement system were simulated in MATLAB environment. Some key technological solutions were proposed, including the specification of ADC, the method of digital phase discrimination, and the algorithm of cross correlation. The experiment schemes of noise floor and frequency standard comparison were designed. The experiment instrument of digital DMTD was established. The measurement experiments were conducted, and the experiment data were calculated and analyzed. The experiment result of noise floor indicates that the noise floor of experiment instrument for 1s frequency stability is better than 5.0×10-13/1s, which is the leading domestic level. The experiment result of frequency standard comparison indicates that the measurement result of the experiment instrument is close to that of 5120A, the measurement capability and performance are better than those of PO7D-2 and ST2002A.