超流体物质波干涉陀螺仪的噪声研究

 陀螺仪的精度与其噪声密切相关,为开发新型高精度的超流体物质波干涉陀螺仪,必须对其噪声进行系统研究。根据超流体陀螺噪声产生的机理,分析了该陀螺噪声的来源,并把超流体陀螺的噪声类型归纳为:热、锁定值波动、温度波动、频率波动和检测元件等。在建立了各噪声数学模型的基础上,利用超流体陀螺通用的参数,对其噪声进行了分析。分析结果表明:热噪声与陀螺的结构参数和工作参数相关,与被测角速度无关;锁定值波动噪声只与结构参数相关;其他噪声与结构参数、工作参数和被测角速度都相关;检测元件、频率波动和锁定值波动噪声是构成超流体陀螺输出噪声的主要因素;在角速度变化量的范围内,超流体陀螺的输出噪声非线性变化,在1 Hz的带宽下,其变化范围为-7到-6次方的数量级。

Research on the Noises of Superfluid Matter Wave Interference Gyroscope

Gyroscope accuracy is closely related to its noise. To develop a novel superfluid matter wave interference gyroscope with high accuracy, its noise should be studied systematically. First, according to the generating mechanism of gyroscope noise, its origins are analyzed. The noise types are classified as thermal, locking value fluctuation, temperature fluctuation, frequency fluctuation and detecting element noise. Then, based on the mathematic model of each noise, the gyroscope noise is analyzed by utilizing some common parameters. The results show that thermal noise is relevant to the gyroscope structure parameter and working parameter, but is irrelevant to detected angular velocity. Locking fluctuation noise is only relevant to structure parameter; the other noises are all related to structure parameter, working parameter and detected angular velocity. Detecting element, frequency and locking value fluctuation noises are the primary factors that contribute to gyroscope output noise. In the range of the changing value of angular velocity, the gyroscope output noise changes nonlinearly with arange from the order of -7 to -6 in 1 Hz bandwidth.