Computer Science – Performance
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974tsbb.nasa..225d&link_type=abstract
In its Telescope Systems for Balloon-Borne Res. p 225-238 (SEE N75-12735 03-74)
Computer Science
Performance
Balloon-Borne Instruments, High Altitude Balloons, Star Trackers, Television Equipment, Data Acquisition, Equipment Specifications, Optical Equipment, Performance Tests, Systems Engineering
Scientific paper
The acquisition system which operates in conjunction with a balloon-borne TV system, boresighted to a telescope is described. It has two main functions, a star field monitor and an offset star tracker. The design of the system was strongly influenced by the TV camera, which uses the same interlaced scanning system as is employed in commercial television broadcasting. To reduce power and bandwidth requirements, the star field information transmitted in our system consists only of the horizontal and vertical coordinates of each star and its brightness. As a star field monitor the system provides video thresholding, camera blemish suppression, coordinate digitization in 3 axes, circuity to recognize as single star the dispersed video signals resulting from one star overlapping adjacent scanning lines and storage of all signals for readout by the telemetry at appropriate times.
Deboo G. J.
Hedlund R. C.
Parra G. T.
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