In order to monitor running status of fiber-optic gyroscope（ FOG） for satellite in real time

and find out the fault caused by internal temperature and optical power changes

a high efficient FOG combined state monitoring system for satellite is designed. Based on temperature characteristic of FOG waveguide

temperature sensing without hardware is realized. The optical power of FOG is monitored by extracting the photodetector signal. The interface circuit based on FPGA + CAN bus is built up. Acquire output angular velocity data of FOG in real-time for satellite at the same time

achieve temperature

optical power combined state information monitoring. Compared with the traditional state monitoring method of FOG

the proposed combined state monitoring system does not need add special temperature measuring component

it uses internal circuit

optical path high efficiently to realize temperature and optical power sensing

and system reliability and security are improved.