光纤陀螺系统中的宽带光源会产生光源相对强度噪声,要提高陀螺性能就必须对其加以抑制。由于开环光纤陀螺使用正弦波调制,相对强度噪声不能直接由陀螺信号相减消除。针对基于正弦波调制的开环光纤陀螺系统信号差分电路放大的特点,设计了一种实现强度噪声抑制的新算法。经实验验证,该算法有效,可使开环光纤陀螺的随机游走减小18%。 Broadband light sources in fiber optic gyroscopes produce relative intensity noise in the light source and must be suppressed in order to improve gyroscopic performance. Since the open-loop FOG uses a sine wave modulation, the relative intensity noise can not be directly canceled by the gyro signal subtraction. Aiming at the amplification of the signal difference circuit based on sine wave modulation in open-loop FOG system, a new algorithm to suppress the intensity noise is designed. Experimental results show that the algorithm is effective and can reduce the random walk of open-loop FOG by 18%.