Dither signal removal of ring laser gyro based on RLS

ZHANG Qing-hua; FAN Zhen-fang

doi:10.3969/j.issn.1001-3806.2010.O5.026

In order to reduce the data delay in the ring laser gyro (RLG) and adopt it in the fast tracking application, the small delay dither signal removal method was proposed based on recursive least-squares(RIS) adaptive filter. Firstly, the theory of RIS adaptive noise cancelling was described. Secondly, the hardware was designed through which the dither feedback signal after A/D transfer and RLG readout signal could be sent to computer via universal serial bus interface.Finally, the RIS adaptive software was programmed to remove the dither signal based on MATLAB.The residual count of deprived signal filtered by an 11-order finite impulse response(FIR) filter is corresponding with that of original ItLG readout signal filtered by a 31-order FIR filter, but the latency is smaller.Experiments show this algorithm has a faster convergence speed and the dither signal can be removed effectively.

Dither signal removal of ring laser gyro based on RLS

Corresponding author: FAN Zhen-fang, Xwlong110@sina.com

1. School of Photoelectrical Science & Technology, National University of Defense Technology, Changsha 410073, China

Received Date: 2009-08-28

Accepted Date: 2009-12-02

Available Online: 2010-09-25

Abstract: In order to reduce the data delay in the ring laser gyro (RLG) and adopt it in the fast tracking application, the small delay dither signal removal method was proposed based on recursive least-squares(RIS) adaptive filter. Firstly, the theory of RIS adaptive noise cancelling was described. Secondly, the hardware was designed through which the dither feedback signal after A/D transfer and RLG readout signal could be sent to computer via universal serial bus interface.Finally, the RIS adaptive software was programmed to remove the dither signal based on MATLAB.The residual count of deprived signal filtered by an 11-order finite impulse response(FIR) filter is corresponding with that of original ItLG readout signal filtered by a 31-order FIR filter, but the latency is smaller.Experiments show this algorithm has a faster convergence speed and the dither signal can be removed effectively.

HTML

Reference (10)

[1]	DOHENY D A,KOLLIG J L.Dither stripper having least-mean-squares adaptive updating of dither stripper gains:U S,7440109 B1[P].2008-10-21.
[2]	MARIO B I.Dither signal removel for a dithered ring laser gyro:U S,5048963[P].1991-09-17.
[3]	KILLPATRICK J E.Dither stripper with non-linearity correction:U S,0201851[P].2004-10-28.
[4]	CALLAGHAN S P,KILLPATRICK J E.Dither signal remover for a dithered ring laser angular rate senser:U S,4826320[P].1989-05-02.
[5]	LJUNG BO H G,SCHRODER G F.Ring laser gyro dither pulse eliminator:U S,4344706[P].1982-08-17.
[6]	XIE Y P,ZHANG G F.Dither signal remover for a dithered ring laser gyroscope utilizing adaptive noise canceling[J].Laser Application,2000,20(3):121-123(in Chinese).
[7]	ZHANG Q H,XIE Y P.Dither signal removal of ring laser gyro based on correlate filter[J].Journal of Transducer,2009,22(9):121-123(in Chinese).
[8]	ZHANG P F,LONG X W.Research of the relation between dither frequency and temperature in mechanically dithered ring laser gyro[J].Laser Technology,2006,30(5):523-525(in Chinese).
[9]	HE Zh Y.Adaptive signal processor[M].Beijing:Science Press,2002:15-20(in Chinese).
[10]	HAYKIN S.Adaptive filter theory[M].4th ed.Beijing:Publishing House of Electronics Industry,2002:347-350(in Chinese).

Dither signal removal of ring laser gyro based on RLS

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views