A scheme for tracking and pointing at small celestial bodies during high velocity encountersA scheme has been developed and verified for closed-loop tracking and pointing space-borne science instruments at small celestial bodies, such as comets and asteroids, during high velocity encounters. To overcome ephemeris uncertainties for these bodies, the scheme involves sequential estimation of flyby model parameters. The design consists of a two-axis gimballed platform mounted on a three-axis stabilized spacecraft. A platform-mounted optical tracker provides closed-loop target measurements and precision micro-step actuators enable high-rate platform slewing. For comet missions which involve dust particle impact disturbances, a dual-mode attitude control scheme is presented for minimizing transient response time.
Document ID
19820055459
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Burdick, G. M. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lin, H.-S. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wong, E. C. (California Institute of Technology, Jet Propulsion Laboratory, Guidance and Control Section, Pasadena CA, United States)