使用光纤陀螺进行精确测量的矢量调制法  

The vector modulation method to precisely measure directional physical values with fiber-optic gyroscope

作　　者：赵岳生[1] 王新图[1] 付振宪[2] 

机构地区：[1]中国西昌卫星发射中心,四川西昌615000 [2]哈尔滨工业大学控制科学与工程系,黑龙江哈尔滨150001

出　　处：《光电工程》2004年第B12期94-97,共4页Opto-Electronic Engineering

摘　　要：以光纤陀螺工程测量为例,提出了精确测量矢性物理量的矢量调制法。依据调制解调原理和线性系统理论,矢量调制法使用机械转动方法,将输入信号在进入传感器之前调制成为正弦波;由于线性传感器的频率保持性和叠加特性,对传感器输出信号解调,将得到准确的输入响应,由此去除常见的传感器偏置、偏置的漂移、干扰与噪声。与其它抑制测量误差的方法(最优估计、滤波等)相比,提高测量精度效果更明显。初步实验表明,使用低精度光纤陀螺能够测量地球自转角速率,能够从 mV 级直流量、峰峰值(-18mV, 1mV)的噪声和干扰中分离出北向地速响应,与北向地速响应的计算值 0.03mV 接近。Taking FOG (Fiber-Optic Gyroscope) used for measurement as an instance, the VMM (Vector Modulation Method) to precisely measure directional physical value is presented. According to the Modulation-Demodulation principle and the lineal system theory, the VMM adopts a mechanical rotation method to modulate the input signal into sine wave before entering sensor. Because of the features of frequency-consistency specialty and superposition of the lineal sensor, precise response of input signal will be derived by means of demodulation. Thereby, the common errors such as bias, shift of bias, noise and disturbance of the output signal can be effectively eliminated. Compared to other ways to eliminate measurement errors, the VMM is more efficient in theory, easier to be implemented in practice. The preliminary experiments offered positive support. The Earth’s Rotary Rate can be measured by low-precision FOG. A response close to theoretical 0.03mV could be derived from direct volts on an mV level, and from noise and disturbance (-18mV, 1mV).

关 键 词：光纤陀螺 干扰 调制解调 偏置 矢量 输入信号 噪声 传感器 保持性 线性系统理论 

分 类 号：O175.5[理学—数学] TP212[理学—基础数学]