Abstract
Frequency standard comparison measurement has important practical significance for the rational use of frequency standard in engineering. This paper was devoted to the study of frequency standard comparison measurement based on classical dual mixing time difference method. However, in the actual system design and implementation, the commonly used counter was discarded and the phase difference was measured by a digital signal processing method based on Field Programmable Gate Array (FPGA). A miniaturized 10 MHz frequency standard comparator with good noise floor was successfully developed. The size of the prototype circuit board is only about 292.1 cm2. The experimental results showed that the noise floor of the frequency standard comparator was typically better than 7.50 × 10-12/s, and its relative error of phase difference measurement was less than 1.70 × 10-5.
Highlights
A frequency standard is a device that can provide sinusoidal signal with high accuracy and stability, and its frequency value is usually 10 MHz, in some cases it can be 5 MHz or Nowadays, commonly used frequency standard comparison methods include oscilloscope method, time interval counting method, beat frequency method, etc
This paper focused on the study of frequency standard comparison measurement method based on DMTD, tried to displace the counter and introduce digital signal processing into the classical DMTD
The phase difference measurement method based on correlation operation was a digital phase difference measurement method, which is widely used in telecommunication, geological exploration, power distribution, aerospace and many other fields
Summary
A frequency standard is a device that can provide sinusoidal signal with high accuracy and stability, and its frequency value is usually 10 MHz, in some cases it can be 5 MHz or. The internal time scale error and trigger error of the counter used for measurement can directly reflect the measurement error of this measurement method Another frequency standard comparison method that has to be mentioned is the DMTD (Dual Mixing Time Difference) method [18,19]. This method combines the advantages of the time interval counting method and the beat frequency method. Due to its higher measurement resolution, the DMTD method is adopted by many excellent commercial frequency standard comparison products on sale, such as Timetech’s Phase-comp, Symmetricom’s MMS (Multi-channel Measurement System) and so on These instruments or systems based on the classical DMTD method have achieved high measurement accuracy. This paper focused on the study of frequency standard comparison measurement method based on DMTD, tried to displace the counter and introduce digital signal processing into the classical DMTD method and developed a high precision and miniaturized frequency standard comparator
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