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Abstract

Systems and methods for simulating electromagnetic environments to be encountered by a moving object such as a missile are disclosed. The systems include compact ranges in 'hardware in the loop' ('HIL') simulations as projection systems to provide cost- and space-efficient apparatus and processes for testing the performance of missiles and other objects. The systems disclosed may include mobile or stationary compact ranges and may use lenses or reflectors in connection with an array of one or more feed horns to convert spherical or 'near field' wavefronts to plane waves within designated 'quiet zones.' If mobile ranges are employed, such ranges may be mounted on the flight tables used for repositioning the missile seekers during the simulations. Also disclosed are apparatus and processes for varying the amplitude and phase characteristics of the energy provided to an array of two or more feed horns in order to vary the apparent angle of received electromagnetic energy at electronic speeds. Typically, the number of feed horns used in varying the apparent angle of arrival is small (e.g., three). However, the small group may be part of a larger array in which switching is used to select one or more groups.

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First Claim