Abstract: A dome antenna with cross polarization compensation for reducing cross polarization induced monopulse tracking errors controls the polarization at the elements of the feed array to reduce the cross-polarization component in a far field radiation pattern of the antenna. Cross-polarization components at each element in the feed array for a linearly polarized plane wave incident at a predetermined direction to the dome are determined and each element is oriented to be polarized orthogonally to the cross-polarized component at that element.

Abstract: A dome antenna including a dome of solid dielectric material and scannable feed array positioned in the base plane thereof. The dielectric material of the dome constructed to provide a dielectric constant that varies with the perpendicular distance from the base plane. Rays emanating from the base plane are continuously refracted within the dome and refracted at the surface thereof, the interface with free space, to accomplish sufficient a scan angle amplification for scanning beam to the horizon and below.

Abstract: The crop discharge spout of an agricultural machine is continuously adjusted so that the crop material discharged therefrom is always directed into a wagon connected to the rear of the agricultural machine. A sensor disposed on the agricultural machine cooperates with a mechanical follower which is coupled therefrom to the wagon to provide a signal indicative of the angle between the agricultural machine and the wagon. The signal is compared with a signal from a second sensor indicative of the angle of the direction of the crop discharge from the spout with respect to the agricultural machine and an error signal is developed from the difference therebetween. The error signal is coupled to a motor which rotates the discharge spout accordingly until the error signal is reduced to zero.