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Radar display
Videos
A radar display is an electronic device that presents radar data to the operator. The radar system transmits pulses or continuous waves of electromagnetic radiation, a small portion of which backscatt
An airport surveillance radar display
An airport surveillance radar display
Chain Home is the canonical A-scope system. This image shows several target "blips" at ranges between 15 and 30 miles from the station. The large blip
Chain Home is the canonical A-scope system. This image shows several target "blips" at ranges between 15 and 30 miles from the station. The large blip on the far left is the leftover signal from the radar's own transmitter; targets in this area could not be seen. The signal is inverted to make measurement simpler.
The L-scope was basically two A-scopes placed side by side and rotated vertically. By comparing the signal strength from two antennas, the rough direc
The L-scope was basically two A-scopes placed side by side and rotated vertically. By comparing the signal strength from two antennas, the rough direction of the blip could be determined. In this case there are two blips, a large one roughly centred and a smaller one far to the right.
This image shows a modern PPI display in use, with the islands and ground surrounding the ship in green.
This image shows a modern PPI display in use, with the islands and ground surrounding the ship in green.
Lobe switching
Videos
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
Radar display
…units, allowing them to lay their guns on even small boats entirely through the radar. To improve the accuracy of angle measurements, the concept of lobe switching became common in early radars. In this system, two antennas are used, pointed slightly left and right, or above and below, the boresight of the system…
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 dire
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.