The phasemeter of Taiji-1 experimental satellite

Taiji-1 is the first demonstrated experimental satellite of Taiji program in China. Phasemeter one key components laser interferometer which responsible for phase extraction heterodyne signals. In this paper, we present architecture and implementation phasemeter. The DPLL used generally regarded as best choice space missions. We test phasemeter on ground results show that reaches sensitivity 600 [Formula: see text]rad/[Formula: text] frequency range 0.01–1[Formula: text]Hz. It further shown it can reach accuracy 30 0.1–1[Formula: text]Hz, both are within technical requirements mission.