Estimation of random errors, which are due to shot noise of photomultiplier tube(PMT) or avalanche photodiode(APD) detectors, is very necessary in lidar observation. Due to the Poisson distribution of incident electro...Estimation of random errors, which are due to shot noise of photomultiplier tube(PMT) or avalanche photodiode(APD) detectors, is very necessary in lidar observation. Due to the Poisson distribution of incident electrons, there still exists a proportional relationship between standard deviation and square root of its mean value. Based on this relationship,noise scale factor(NSF) is introduced into the estimation, which only needs a single data sample. This method overcomes the distractions of atmospheric fluctuations during calculation of random errors. The results show that this method is feasible and reliable.展开更多
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
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB05040300)the National Natural Science Foundation of China(Grant No.41205119)
文摘Estimation of random errors, which are due to shot noise of photomultiplier tube(PMT) or avalanche photodiode(APD) detectors, is very necessary in lidar observation. Due to the Poisson distribution of incident electrons, there still exists a proportional relationship between standard deviation and square root of its mean value. Based on this relationship,noise scale factor(NSF) is introduced into the estimation, which only needs a single data sample. This method overcomes the distractions of atmospheric fluctuations during calculation of random errors. The results show that this method is feasible and reliable.
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。
