Based on the theory of signal processing and random process,the total precision of the time-division multiplexing(TDM)of three-axis fiber optic gyroscope(FOG) is analyzed.The attenuation model of detection phase error in closed loop process is made by using difference equations in the TDM system.By dividing the whole noise of one axis into two parts:steady noise and adjusting noise,a calculation formula of reduced SNR is derived.Related parameters are simulated according to the formula calculations.Some wor...