Title :
The study of north-finder based on rate biased RLG
Author :
Yan, Zhang ; Wenqi, Wu ; Juliang, Cao
Author_Institution :
Coll. of Mechatron. & Autom., Nat. Univ. of Defense Technol., Changsha, China
Abstract :
Rated biased RLG is used in the north-finder based on a continuous rotation platform. Along with the rotating platform, the input axis of RLG relative to the earth rotation rate vector periodically changes. In this way, the measurement error of RLG is modulated in every direction. The cross-correlation analysis method is used for getting the azimuth angle. Considering the periodicity of gyro outputs, a digital filter is designed to decrease the influence of quantization error of RLG and some other wideband error sources. Experiment results show that the “cross-correlation analysis + filter” method can markedly increase the precision of the north-finder.
Keywords :
digital filters; gyroscopes; measurement errors; quantisation (signal); ring lasers; azimuth angle; cross-correlation analysis method; digital filter; measurement error; north-finder; quantization error; rate biased RLG; Azimuth; Earth; Finite impulse response filter; Noise measurement; Quantization; Signal to noise ratio;
Conference_Titel :
Systems and Control in Aeronautics and Astronautics (ISSCAA), 2010 3rd International Symposium on
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-6043-4
Electronic_ISBN :
978-1-4244-7505-6
DOI :
10.1109/ISSCAA.2010.5633349
