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The radar "looks" with the looking angle θ (or so called off-nadir angle). The angle α between x-axis and the line of sight (LOS) is called cone angle, the angle φ between the x-axis and the projection of the line of sight to the (x; y)-plane is called azimuth angle. Cone- and azimuth angle are related by cosα = cosφ ∙ cosε.
Conical scanning concept. The radar beam is rotated in a small circle around the "boresight" axis, which is pointed at the target. 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.
A pencil-beam radar A moving or sweeping pencil-beam radar. In optics, a pencil or pencil of rays, also known as a pencil beam or narrow beam, is a geometric construct (pencil of half-lines) used to describe a beam or portion of a beam of electromagnetic radiation or charged particles, typically in the form of a cone or cylinder.
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At any range, with similar azimuth and elevation angles and as viewed by a radar with an unmodulated pulse, the range resolution is approximately equal in distance to half of the pulse duration times the speed of light (approximately 300 meters per microsecond). Radar echoes, showing a representation of the carrier
The radar used an 18 inches (460 mm) parabolic reflector driven in a spiral at 1000 rpm by a 1 ⁄ 2 horsepower electric motor. The scanning went from dead astern to 45 degrees out over a period of 18 rotations, and then back in again, scanning out a 90 degree cone over a period of about 2 + 1 ⁄ 4 seconds.