Definitions list
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imagingTechniques used to produce, process and retrieve image signals.
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imaging instrumentInstrument or device used to obtain an image. For example, an imaging radar or imaging radiometer.
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imaging radarRadar capable of acquiring imagery of land surfaces and oceans, day and night, and in all weathers.
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in-situIn the field of space, in-situ observations describe observations performed on the ground, as opposed to satellite observations.
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infrared montgolfiereAirship heated naturally by the Earth’s infrared flux at night, augmented by solar radiation during the day.
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injection pointPoint in space at which a launch vehicle releases its satellite payload and imparts the required velocity to boost it into the target orbit.
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interferometryMeasuring technique that exploits a phenomenon called interference. Interferometry determines the difference in the distances between a source of electromagnetic waves and 2 receivers placed a small distance apart. It works by measuring the phase difference of the received signals.
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investigation testTest designed to push an item of equipment to its operating limits, which may even destroy the equipment.
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ionosphereLayer of the upper atmosphere of Earth and certain other planets containing charged particles (electrons and ions).