XU Lin-sheng，GAO Yu-ping，WANG Hong-yuan

（National Time Service Center, Chinese Academy of Sciences, Xi’an, Shaanxi 710600,China）

Abstract：The design and principle of a GPS （global positioning system）carrier phase measurement positioning device is introduced. The GPS carrier phase measurement positioning device is composed of MOTOROLA VP board, single-chip computer, nonvolatile memory and A/D converter. This device has such characteristics as high measurement precision, low power dissipation, light weight, convenient and flexible operation, anti-jamming capabilities, and automatical recording of long-term data.

Key words：GPS carrier phase；measurement；positioning；hardware；program design