为明晰基于力平衡(Force to Rebalance,FTR)检测模式的MEMS速率陀螺仪中相位误差对陀螺仪静态和动态性能的影响规律,构建了包含相位误差的FTR速率控制回路模型,以此分析不同相位误差对动静态性能的影响。首先,介绍了采用FTR速率模式的...为明晰基于力平衡(Force to Rebalance,FTR)检测模式的MEMS速率陀螺仪中相位误差对陀螺仪静态和动态性能的影响规律,构建了包含相位误差的FTR速率控制回路模型,以此分析不同相位误差对动静态性能的影响。首先,介绍了采用FTR速率模式的陀螺仪基本原理,简要分析了相位误差对驱动模态的影响。接着,提出了包含反馈通路和前向通路相位误差的FTR速率控制回路模型,并对该模型进行了等效变换。然后,根据上述模型分析不同类型的相位误差对陀螺仪动态和静态性能的影响。最后,进行了相应的试验验证。实验结果表明:反馈通路中的相位误差的两小时测量值的稳定性为0.0949,且该误差仅会改变标度因数;前向通路中的相位误差为温度敏感项,且补偿前后的零偏值和零偏漂移值分别缩小了4.8和2.9倍,零偏不稳定性和角度随机游走分别提升了0.8和0.9倍。反馈通路的相位误差可以通过标度的方法来获取进行补偿,且该误差仅影响标度因数的数值大小,并不影响零偏和带宽性能;前向通路中的相位误差严重制约了静态性能,但室温状态下并不影响动态性能。展开更多
In order to improve the detection accuracy of Doppler asymmetric spatial heterodyne(DASH)interferometer in harsh temperatures,an opto-mechanical-thermal integration analysis is carried out.Firstly,the correlation betw...In order to improve the detection accuracy of Doppler asymmetric spatial heterodyne(DASH)interferometer in harsh temperatures,an opto-mechanical-thermal integration analysis is carried out.Firstly,the correlation between the interference phase and temperature is established according to the working principle and the phase algorithm of the interferometer.Secondly,the optical mechanical thermal analysis model and thermal deformation data acquisition model are designed.The deformation data of the interference module and the imaging optical system at different temperatures are given by temperature load simulation analysis,and the phase error caused by thermal deformation is obtained by fitting.Finally,based on the wind speed error caused by thermal deformation of each component,a reasonable temperature control scheme is proposed.The results show that the interference module occupies the main cause,the temperature must be controlled within(20±0.05)℃,and the temperature control should be carried out for the temperature sensitive parts,and the wind speed error caused by the part is 3.8 m/s.The thermal drift between the magnification of the imaging optical system and the thermal drift of the relative position between the imaging optical system and the detector should occupy the secondary cause,which should be controlled within(20±2)℃,and the wind speed error caused by the part is 3.05 m/s.In summary,the wind measurement error caused by interference module,imaging optical system,and the relative position between the imaging optical system and the detector can be controlled within 6.85 m/s.The analysis and temperature control schemes presented in this paper can provide theoretical basis for DASH interferometer engineering applications.展开更多
文摘为明晰基于力平衡(Force to Rebalance,FTR)检测模式的MEMS速率陀螺仪中相位误差对陀螺仪静态和动态性能的影响规律,构建了包含相位误差的FTR速率控制回路模型,以此分析不同相位误差对动静态性能的影响。首先,介绍了采用FTR速率模式的陀螺仪基本原理,简要分析了相位误差对驱动模态的影响。接着,提出了包含反馈通路和前向通路相位误差的FTR速率控制回路模型,并对该模型进行了等效变换。然后,根据上述模型分析不同类型的相位误差对陀螺仪动态和静态性能的影响。最后,进行了相应的试验验证。实验结果表明:反馈通路中的相位误差的两小时测量值的稳定性为0.0949,且该误差仅会改变标度因数;前向通路中的相位误差为温度敏感项,且补偿前后的零偏值和零偏漂移值分别缩小了4.8和2.9倍,零偏不稳定性和角度随机游走分别提升了0.8和0.9倍。反馈通路的相位误差可以通过标度的方法来获取进行补偿,且该误差仅影响标度因数的数值大小,并不影响零偏和带宽性能;前向通路中的相位误差严重制约了静态性能,但室温状态下并不影响动态性能。
文摘In order to improve the detection accuracy of Doppler asymmetric spatial heterodyne(DASH)interferometer in harsh temperatures,an opto-mechanical-thermal integration analysis is carried out.Firstly,the correlation between the interference phase and temperature is established according to the working principle and the phase algorithm of the interferometer.Secondly,the optical mechanical thermal analysis model and thermal deformation data acquisition model are designed.The deformation data of the interference module and the imaging optical system at different temperatures are given by temperature load simulation analysis,and the phase error caused by thermal deformation is obtained by fitting.Finally,based on the wind speed error caused by thermal deformation of each component,a reasonable temperature control scheme is proposed.The results show that the interference module occupies the main cause,the temperature must be controlled within(20±0.05)℃,and the temperature control should be carried out for the temperature sensitive parts,and the wind speed error caused by the part is 3.8 m/s.The thermal drift between the magnification of the imaging optical system and the thermal drift of the relative position between the imaging optical system and the detector should occupy the secondary cause,which should be controlled within(20±2)℃,and the wind speed error caused by the part is 3.05 m/s.In summary,the wind measurement error caused by interference module,imaging optical system,and the relative position between the imaging optical system and the detector can be controlled within 6.85 m/s.The analysis and temperature control schemes presented in this paper can provide theoretical basis for DASH interferometer engineering applications.
