Test target: Difference between revisions
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On the Mars Exploration Rover, the target was designed with a pillar elevated above the main surface, so that the targe could be used as a [[sundial]]. |
On the Mars Exploration Rover, the target was designed with a pillar elevated above the main surface, so that the targe could be used as a [[sundial]]. |
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[[Category: Spacecraft components]] |
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Revision as of 20:16, 10 September 2004
A Test Target is a common feature on interplanetary landing craft such as the Viking Lander and Mars Exploration Rovers. The target is usually a visible marker or plate on the exterior of the vehicle, within sight of the lander's imaging system, usually a CCD camera. The target first possesses samples of primary colors and a grey scale. The camera uses this much like a photographer would use a chip chart on Earth; the color samples allow the camera to compensate for white balance and contrast. The target provides a visual reference as well, so that the initial orientation of the camera can be fixed.
On the Mars Exploration Rover, the target was designed with a pillar elevated above the main surface, so that the targe could be used as a sundial.