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With the development of Modern High-New Techniques, the high-precision phase comparison instruments play a great role in navigational positioning, network communication, field of national defense etc. So it is important to resolve the phenomenon of "dead zone" during phase comparison. In this paper, a method of high-precision phase comparison between periodic signals is proposed based on phase coincidence theory and border effect theory. By this way, the ±1 count error can almost be eliminated. Above all, a phase-comparison curve with high performance such as full period, no dead-zone and high linearity, is acquired. The experimental result proves that this method is reliable and practical, meanwhile the phase-comparison curve is of significance in other measurement fields. Introduction The high-precision phase comparison apparatus is widely used in communication system, time service, comparison of frequency standard, field of broadband infrastructure etc., especially in the study of phase frequency characteristics of the network. Furthermore, since ultra-high precision frequency sources come out gradually, the theory of measuring and processing time-frequency signals also needs to be kept reforming and innovating, then there is a need to strengthen the research on ultra-high precision phase comparison devices. In the process of the rapid development of modern science and technology, phase difference is usually measured by observing oscilloscope, comparing phase, measuring voltage and measuring time interval. These common methods can be utilized in some fields without the requirement of high precision. But, because of the limitation of these methods themselves, leading to the impossibility of improving the measuring precision. So it is extremely urgent to do research on new method of phase comparison to meet the requirement of high precision in every field. By a study of precise time and frequency measurement technology, it is useful to increase the precision in phase comparison measurement by combing the theory of relationship between phases and the theory of border effect, which contributes to advancing the development of measurement fields. On the basis of these two theories, a system of phase comparison is designed for acquiring a phase-comparison curve with high linearity and full period. International Conference on Advances in Mechanical Engineering and Industrial Informatics (AMEII 2015) © 2015. The authors Published by Atlantis Press 527

A new method to eliminate dead zone of phase-comparison instruments adjacent to 0d and 360d