Lobe switching
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Lobe switching is a method used on early radar sets to improve tracking accuracy. It uses two slightly separated antenna elements to send the beam slightly to either side of the midline of the antenna
Lobe switching concept. If both halves of the antenna are fed with the same phase shift, then a main lobe is generated with a maximum in the main direction. The measuring using this main lobe is inaccurate. With an opposite phase feed, two large lobes are created with a sharp minimum between them. A bearing with this minimum is much more accurate.
Conical scanning
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Conical scanning is a system used in early radar units to improve their accuracy, as well as making it easier to steer the antenna properly to point at a target. Conical scanning is similar in concept
Lobe switching
…which direction the antenna should be moved to point directly at the target. The concept was used only briefly, and was almost completely replaced by conical scanning systems by the end of World War II. The concept is also infrequently referred to as sequential lobing, particularly when the signal steps between several…
Conical scanning concept. The radar beam is rotated in a small circle around the "boresight" axis, which is pointed at the target.