Abstract
The helicopter main rotor blade can be used as a scanning radar antenna. Its large aperture gives a narrow azimuth beam‐width and the natural rotor scanning motion provides a fast scan. It is much lighter than conventional antennas and since it is integral with the rotor blade, it induces no additional drag. Fifteen foot long slotted array antennas have been installed in both the leading and trailing edge of UH‐1B helicopter. Flight tests have been performed on the leading edge antenna. No undesirable effects were caused by blade bending or feathering action. A radar installed inside the helicopter can feed the antennas through the hollow main mast with a rotary joint at the top. A radar with 0.1 microsecond pulse width, 20 kilocycle pulse repetition frequency, 30 kilowatt power, and a Daylight View Storage Tube can provide a real time mapping capability greater than any present helicopter radar. The antenna feasibility has been proven in a flight test program.
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