Suppression of the G-sensitive drift of laser gyro in dual-axis rotational inertial navigation system

doi:10.23919/JSEE.2021.000071

Journal of Systems Engineering and Electronics ›› 2021, Vol. 32 ›› Issue (4): 822-830.doi: 10.23919/JSEE.2021.000071

• ELECTRONICS TECHNOLOGY • Previous Articles Next Articles

Suppression of the G-sensitive drift of laser gyro in dual-axis rotational inertial navigation system

Xudong YU*(), Zichao WANG(), Huiying FAN(), Guo WEI(), Lin WANG()

¹ College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

Received:2020-11-12 Online:2021-08-18 Published:2021-09-30
Contact: Xudong YU E-mail:wind0909@163.com;w731730602@163.com;13404676477@163.com;nudtweiguo@163.com;wanglinshanda@163.com
About author:|YU Xudong was born in 1982. He received his B.S. and Ph.D. degrees in optical engineering from the National University of Defense Technology, in 2001 and 2011, respectively. He is currently an associate researcher in the National University of Defense Technology. His research interests include signal processing, ring laser gyro and inertial navigation system. E-mail: wind0909@163.com||WANG Zichao was born in 1997. He received his B.S. degree in optical engineering from the National University of Defense Technology, in 2019. He is currently a postgraduate student in the National University of Defense Technology. His research interests include ring laser gyro and inertial navigation system. E-mail: w731730602@163.com||FAN Huiying was born in 1996. He received his B.S. degree in information and communication engineering from the National University of Defense Technology, in 2018. He is currently working toward his M.S. degree in optical engineering. His research interests include strapdown inertial navigation system and rotation modulation technology. E-mail: 13404676477@163.com||WEI Guo was born in 1985. He received his B.S. degree in measurement-control technology and instrument from Southeast University and his Ph.D. degree in optical engineering from the National University of Defense Technology, in 2003 and 2013, respectively. He is currently an associate professor in the National University of Defense Technology. His research interests include ring laser gyro, inertial measurement and integrated navigation system. E-mail: nudtweiguo@163.com||WANG Lin was born in 1987. He received his B.S. and Ph.D. degrees in control science and engineering from the National University of Defense Technology, Changsha, China, in 2013 and 2018, respectively. He is currently an associate researcher in the National University of Defense Technology. His research interests include inertial navigation and integrated navigation system. E-mail: wanglinshanda@163.com
Supported by:
This work was supported by the National Natural Science Foundation of China (61503399)

Abstract

Abstract:

The dual-axis rotational inertial navigation system (INS) with dithered ring laser gyro (DRLG) is widely used in high precision navigation. The major inertial sensor errors such as drift errors of gyro and accelerometer can be averaged out, but the G-sensitive drifts of laser gyro cannot be averaged out by indexing. A 16-position rotational simulation experiment proves the G-sensitive drift will affect the long-term navigation error for the rotational INS quantitatively. The vibration coupling and asymmetric structure of the DRLG are the main errors. A new dithered mechanism and optimized DRLG is designed. The validity and efficiency of the optimized design are conformed by 1 g sinusoidal vibration experiments. An optimized inertial measurement unit (IMU) is formulated and measured experimentally. Laboratory and vehicle experimental results show that the divergence speed of longitude errors can be effectively slowed down in the optimized IMU. In long term independent navigation, the position accuracy of dual-axis rotational INS is improved close to 50%, and the G-sensitive drifts of laser gyro in the optimized IMU are less than 0.000 2 °/h. These results have important theoretical significance and practical value for improving the structural dynamic characteristics of DRLG INS, especially the high-precision inertial system.

Key words: inertial navigation, rotational inertial navigation system (INS), laser gyro, G-sensitive drift

Xudong YU, Zichao WANG, Huiying FAN, Guo WEI, Lin WANG. Suppression of the G-sensitive drift of laser gyro in dual-axis rotational inertial navigation system[J]. Journal of Systems Engineering and Electronics, 2021, 32(4): 822-830.

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References 23

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Experiment item	Error item	Group	INS-A	INS-B
Laboratory static navigation (120 h)	East velocity error/ (m/s) (1 $ \sigma $ )	1	0.21	0.19
		2	0.25	0.24
		3	0.27	0.20
	North velocity error/(m/s) (1 $ \sigma $ )	1	0.25	0.21
		2	0.19	0.25
		3	0.31	0.29
	Longitude error/( $ ' $ ) (Max)	1	0.92	0.51
		2	0.87	0.35
		3	1.06	0.42
	Latitude error/( $ ' $ ) (Max)	1	0.35	0.30
		2	0.42	0.51
		3	0.45	0.37
Vehicle navigation (120 h)	East velocity error/(m/s) (1 $ \sigma $ )	1	0.41	0.31
		2	0.23	0.28
		3	0.28	0.35
	North velocity error/(m/s) (1 $ \sigma $ )	1	0.31	0.18
		2	0.32	0.32
		3	0.29	0.29
	Longitude error/( $ ' $ ) (Max)	1	0.94	0.47
		2	0.98	0.43
		3	1.23	0.52
	Latitude error/( $ ' $ ) (Max)	1	0.33	0.34
		2	0.46	0.37
		3	0.38	0.45

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Suppression of the G-sensitive drift of laser gyro in dual-axis rotational inertial navigation system

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