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三轴一体光纤陀螺系统复用后对单轴性能参数的影响程度是直接关系到复用技术研究是否具有实用价值的首要问题。介绍了光学敏感部分共用光源与探测器,信号处理部分采用单信号处理电路分时处理的三轴光纤陀螺复用技术方案的原理。从光纤陀螺性能参数的公式定义出发,理论分析了时分复用技术对三轴陀螺系统中单轴性能参数的影响规律:在分时工作过程中各轴的有效闭环时间为一个总闭环周期的1/4时,零偏稳定性变化2倍,标度因数的大小不变。实验样机测试结果为:零偏稳定性变化约为3倍,标度因数的大小基本一致。研究结果证明时分复用方案对单轴性能参数的影响量级在可接受范围内,该方案在相应低精度应用领域仍然可用。
The degree of influence on the uniaxial performance parameters of the three-axis integrated fiber optic gyroscope system after being multiplexed is the most important issue that is directly related to whether the research on multiplexing technology is of practical value. This paper introduces the principle of three-axis fiber optic gyroscope (FOG) multiplexing scheme that the optical sensitive part shares the light source and the detector and the signal processing part adopts the single signal processing circuit to deal with the time-sharing. Based on the definition of the performance parameters of FOG, the influence of time division multiplexing on the uniaxial performance parameters of the three-axis gyro system is theoretically analyzed. The effective closed-loop time of each axis in time-sharing operation is 1 / 4, the bias stability changes 2 times, the size of the scale factor unchanged. The test results of the experimental prototype are as follows: the stability of the bias deviation is about 3 times, and the scale factors are basically the same. The results demonstrate that the magnitude of the impact of the TDM scheme on uniaxial performance parameters is within an acceptable range and that this scheme is still available for the corresponding low-precision applications.