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The RCS is integral to the development of radar Stealth Technology , particularly in applications involving Aircraft and Ballistic Missile s. RCS data for current military aircraft are almost all highly classified. MEASUREMENT Measurement of a target's RCS is performed at a radar Reflectivity Range or Scattering Range . The first type of range is an outdoor range where the target is positioned on the Pylon some distance down-range from the transmitters. Such a range eliminates the need for placing radar absorbers behind the target, however Multi-path effects due to the ground must be mitigated. An Anechoic Chamber is also commonly used. In such a room, the target is placed on a rotating pillar in the center, and the walls, floors and ceiling are covered by stacks of radar absorbing material. These absorbers prevent corruption of the measurement due to reflections. A compact range is an anechoic chamber with a reflector to simulate far field conditions. CALCULATION Quantitatively, the RCS is an effective surface area that intercepts the incident wave and that scatters the energy Isotropic ally in space. For the RCS, is defined in three-dimensions as Where is the RCS, is the incident Power Density measured at the target, and is the scattered power density seen at a distance away from the target. In electromagnetic analysis this is also commonly written as |
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