卫星用光纤陀螺三轴组合的关键技术

Three-cluster fiber-optic gyroscope for satellite

研究了空间环境对光纤陀螺各项指标的影响,设计了一种新颖的卫星用光纤陀螺三轴组合.针对空间辐射、温度循环和真空环境对光纤陀螺的影响进行了模拟实验,通过分析实验数据得到了空间环境对光纤陀螺主要参数的影响机理.利用最小二乘滤波的方法建立了偏置误差模型,利用查表法建立了标度因数误差模型,并用现场可编程门阵列(FPGA)实时进行零偏和标度因数补偿,补偿后陀螺输出零偏稳定性为0.1(°)/h.同时详细分析了陀螺在空间低角速度环境下产生死区的原因,并利用周期相位扰动调制的方法消除了死区.在卫星用光纤陀螺三轴组合的设计中,实现了光源复用和冗余、空间主动和被动防护措施、在轨故障诊断等技术.

Effects of space environment upon fiber-optic gyroscope（FOG） performance were studied, and a new-style assemble of 3-axis fiber optic-gyroscope used in satellite was designed. Simulation experiment was finished to analyze the effects of space radiation, vacuum environment and temperature cycle upon FOG. And the main mechanism of the effects of space environment upon FOG was obtained by analyzing the experimental data. A bias error model was developed by using least squares filtering, and a scale factor error model was developed by using look-up table. Both models were implemented in field programmed gate array （FPGA） for compensation of bias stability, which reduces the bias stability to 0.1 （°）/h. The reasons for dead band in space are analyzed, and the error of dead band is to be suppressed by using the cycle phase modulation. During the design of the fiber optic gyroscope, the technology of multiplexing and redundancy of the light source, and the protective measures in space as well as the fault diagnosis in orbit are designed and implemented.