<title>Real-time ground-based optical detection system for space debris</title>

Abstract

Real-time ground-based optical detection system for space debrisJonathan Marchant', Simon Green', James Dick2'Unit For Space Sciences and Astrophysics, University of Kent, Canterbury, CT2 7NR, UK2Royal Greenwich Observatory, Madingley Road, Cambridge, CB3 OEZ, UKABSTRACTThere are many advantages to supplementing ground based radar debris detection systems with optical systems. For example:objects with a low radar signature can still be optically bright (and vice versa); in the field of space debris optical detection isless sensitive to range; the minimum detectable debris size for a given range is less than that for radar. Destructive debris can beas small as 1 cm, so any improvement in detection sensitivity towards this standard is important.To improve the accuracy of debris orbital elements, a real-time detection system might be preferable in contrast to one in whichimages are stored for post-observation (daytime) analysis. This is because more than one telescope is needed to lengthen theobserving baseline and so increase the detected fraction of the debris orbit. Therefore, any software based at one telescope thatrecognises debris in its field of view, produces a first approximation of its orbit elements and alerts extra telescopes along track,must process its data quickly, and preferably during the same pass.A prototype of such a software system under development for use with a CCD camera at the Royal Greenwich Observatory'sSatellite Laser Ranger at Herstmonceux, East Sussex, England, is outlined. The methods which the detection algorithm employsto handle data from the camera system are described, along with the limitations that the hardware and processing time imposeon the physical nature of the problem.Keywords: Space debris, ground-based optical detection and tracking.