振动条件下陀螺加速度计误差抑制技术
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摘要
为了减小振动条件下惯性平台陀螺加速度计的振动误差,提出一种基于陀螺加速度计进动时间数据的整周小波去噪测试方法。该方法在静态和线振动状态下分别测量平台系统中陀螺加速度计进动整周期的相关时间数据,基于改进小波方法进行去噪后,得到静态和线振动状态下的时间序列,经计算得到陀螺加速度计的振动误差。该方法能抑制陀螺加速度计输出平均角速率误差,提高陀螺加速度计随平台系统在线振动台上的测量精度。最后采用实测数据验证算法的有效性,辨识精度达到10~(-7),该方法提高陀螺加速度计随平台系统在线振动台上的振动精度。
In order to reduce the vibration error of PIGA(pendulous integrating gyro accelerometer) of inertial platform under vibration conditions, a measurement method for noise reduction based on the PIGA precession during integer periods is proposed. The method is used to measure the relative time data of the precession of the PIGA in the inertial platform system under both static state and vibration state. Based on the improved wavelet method, the time series of static state and vibration state are obtained, and then the vibration error of the gyroscope accelerometer is calculated. By this testing method, the precession angular rate error of the PIGA is suppressed, and the accuracy of the test under vibration state is improved. Finally, the validity of the algorithm is verified by the measured data, and the accuracy of the identification can reach 10~(-7). The vibration accuracy of the PIGA in the inertial platform system under vibration state is improved.
In order to reduce the vibration error of PIGA(pendulous integrating gyro accelerometer) of inertial platform under vibration conditions, a measurement method for noise reduction based on the PIGA precession during integer periods is proposed. The method is used to measure the relative time data of the precession of the PIGA in the inertial platform system under both static state and vibration state. Based on the improved wavelet method, the time series of static state and vibration state are obtained, and then the vibration error of the gyroscope accelerometer is calculated. By this testing method, the precession angular rate error of the PIGA is suppressed, and the accuracy of the test under vibration state is improved. Finally, the validity of the algorithm is verified by the measured data, and the accuracy of the identification can reach 10~(-7). The vibration accuracy of the PIGA in the inertial platform system under vibration state is improved.
引文
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[2]刘毕炎.三浮陀螺加速度计温度模型的分析与研究[D].北京:中国航天科技集团公司第一研究院,2017.
[3]孙闯,任顺清,师少龙,等.陀螺加速度计线振动台进动整周测试方法[J].中国惯性技术学报,2016(5):672-676.
[4]赵阳,娄小平,刘锋,等.自适应MEMS加速度计滤波算法[J].传感器与微系统,2016(11):120-122.
[5]徐超,沈晓蓉,李建军,等.车载微加速度计信号的小波去噪技术研究[J].传感技术学报,2007(11):2442-2444.
[6]刘海江,刘世高,李敏.换挡加速度信号的EMD和小波阈值降噪方法[J].噪声与振动控制,2018(2):198-203.
[7]刘彤,李晶,王美玲,等.角加速度信号自适应小波的去噪方法[J].振动振动、测试与诊断,2017(6):1149-1155.
[8]陈大志.加速度传感器数据处理与分析系统设计[D].成都:西南科技大学,2016.
[9]朱战辉,汪立新,张首彦,等.基于时频谱融合的加速度计信号分析[J].电光与控制,2017(2):81-84.
[10]邓益元.静压液浮陀螺平台系统[M].北京:中国宇航出版社.
[11]张鹏,高放,阚宏林,等.一种改进的加速度传感器数据预处理方法[J].仪表技术,2017(6):16-18.
[12]叶心静.新一代外贸155测速雷达数据处理系统的研究与实现[D].南京:南京理工大学,2017.