Research on high-resolution displacement detection technology in space

In this paper, we introduce a developed high-precision displacement detector in space. It consists of two main parts, a capacitive type sensor and a displacement detection circuit system. Among them, the displacement detection circuit system consists of three main parts: the carrier signal source, the high-precision displacement detector, and the external power supply of the detector. The results show that the gain of the displacement detector is
$7.129\times 10^{5}V/m$
, and the resolution of the displacement can reach
$6.84\times 10^{-12}m/Hz^{0.5}$
at low frequency and 2.
$74\times 10^{-12}m/Hz^{0.5}at$
high frequency in the range of
$5mHz\sim 1Hz$
.