PN9000相位噪声测试系统扩频方法研究

Research on Expanding Frequency Range Method of PN9000 Phase Noise Measurement System

摘要:

在航天测控领域,相位噪声指标已成为系统性能的限制性因素,精确测量载波的相位噪声显得尤为重要；PN9000相位噪声测试系统可直接应用于相位噪声测试,具备测试灵敏度高、系统稳定、测试快速等优点；随着航天测控领域所用频率的不断提高,针对PN9000相位噪声测试系统基本配置的频率范围已无法满足测试需求的问题,为满足PN9000相位噪声测试系统扩频需求,文中提出基于相位检波器法(基本型)和基于中频相位检波器法两种扩频方法,并对两种方法进行原理分析和实验验证；根据实验结果,两种方法均能有效实现扩频功能,但在系统本底相位噪声及经费使用方面各有不同特点；文中提供的方法及实验数据,对PN9000相位噪声测试系统扩频升级及配件选购等具有很好的借鉴作用。

Abstract:

The system performance is often limited by phase noise in the field of space measurement and control. Accurate measurement of carrier phase noise is particularly important.PN9000 phase noise measurement system can be directly applied to accurately measure phase noise, it has the advantages of high sensitivity, maintenance, fast test and so on. As the frequency of space measurement and control field is increased, the frequency measurement range of PN9000 basic configuration can not meet the test requirement. To meet the requirement of expanding frequency range of PN9000 phase noise measurement system, the two expanding frequency range methods were proposed that respectively based on phase detector (fundamental form) and IF phase detector, and the theoretical results with experimental data were compared. According to the experimental results, the intention of expanding frequency range can be realized by using any one of the two methods, but the different characteristics in system floor phase noise and costs are showed. The two methods and experimental data in the paper can be referred for expanding frequency range of PN9000 phase noise measurement system and choosing suitable accessories.