| CPC H04B 7/18506 (2013.01) [H04B 7/04 (2013.01)] | 14 Claims |

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1. A RADAR system comprising:
a plurality of ground stations, each comprising a plurality of ground-based directional antennae, each ground-based directional antenna having a beam width associated with a particular area of space above the ground station;
each ground-based directional antenna comprising at least one software defined radio coupled to the directional antenna so that the ground-based directional antenna transmits one or more radio frequency signals generated by the software defined radio at one or more frequencies and provides to the software defined radio signals received by the ground-based directional antenna at one or more frequencies;
wherein, each of a plurality of the ground stations may transmit a radio frequency signal to a defined area of space so that the transmitted radio signals arrive in the defined area of space at approximately the same time; and wherein, each of the plurality of ground stations detect radio signals reflected by an object within the defined area of space; and
wherein the RADAR system further comprises a processor for processing reflected signals received by one or more of the plurality of ground stations to identify the presence of objects within the defined space.
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