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Autoguidance video sensor for dockingThe Automated Rendezvous and Docking system (ARAD) is composed of two parts. The first part is the sensor which consists of a video camera ringed with two wavelengths of laser diode. The second part is a standard Remote Manipulator System (RMS) target used on the Orbiter that has been modified with three circular pieces of retro-reflective tape covered by optical filters which correspond to one of the wavelengths of laser diode. The sensor is on the chase vehicle and the target is on the target vehicle. The ARAD system works by pulsing one wavelength laser diodes and taking a picture. Then the second wavelength laser diodes are pulsed and a second picture is taken. One picture is subtracted from the other and the resultant picture is thresholded. All adjacent pixels above threshold are blobbed together (X and Y centroids calculated). All blob centroids are checked to recognize the target out of noise. Then the three target spots are windowed and tracked. The three target spot centroids are used to evaluate the roll, yaw, pitch, range, azimuth, and elevation. From that a guidance routine can guide the chase vehicle to dock with the target vehicle with the correct orientation.
Document ID
19930002766
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Book, Michael L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Bryan, Thomas C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Howard, Richard T.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Dabney, Richard W.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Publication Information
Publication: NASA. Lyndon B. Johnson Space Center, Fifth Annual Workshop on Space Operations Applications and Research (SOAR 1991), Volume 1
Subject Category
Spacecraft Instrumentation
Accession Number
93N11954
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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