外场环境下频率测量系统的设计

提出在外场使用环境下的频率测量系统的设计方法,用于外场复杂测试环境,设计满足机动化、一体化测量要求。系统采用连续采样的频差倍增法,采用双平衡混频器实现混频模块、滤波电路,提高测量分辨能力,根据GPIB接口特点,采用D7210C和75160BN,75161BN芯片实现计算机与仪器与测量仪器间的双向、异步、准确可靠的数据通信任务,编写软件,采用自动化测量方式,完成外场环境下原子频标的频率测量。通过对实验室和外场的比对试验数据得出系统满足测试要求,设计的系统1s比对不确定度指标达到4×10E-13。

Design of frequency measurement system used in field environment

The frequency measurement system design method is proposed, which is used in complex field test environment,and it meets the mobility,integration of measurement requirements. System uses a continuous sampling of the frequency difference multiplication method, using double balanced mixer to achieve mixing module, filter circuit, to improve the measurement resolution capability. According to the GPIB interface characteristics,D7210C and 75160BN, 75161BN chip computer equipment and measuring instruments between bi-direetional, asynchronous, accurate and reliable data communications tasks. Its software, and automated measurement, can complete atomic frequency field environment subject frequency measurement. Through laboratory and field test data show that the system can meet the test requirements,the system＇s 1 s uncertainty index has reached 4 × 10^-11.