An analysis is made of the reduction in operating range and of the increase in bearing errors that are occasioned by random variations in aircraft heading in an airborne radar employing a flush, unstabilized antenna. The optimum pattern for an unstabilized antenna is shown to be a fan beam, and a table is presented that shows the range penalty inher-ent in the use of a fan beam. Bearing errors that are occasioned by the use of tilt-stabilized or unstabilized flush antennas are presented in the form of contour plots of linear bearing on the ground for various values of pitch and roll of the aircraft.
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