Racon

Racon (English for radar beacon ) are radar beacons. This beacon ( beacon ) to be installed on navaids such as fairway tons.

Racon

Radar response beacons have a receiver and transmitter in Frequemzbereich the ship radars. You respond without delay to the signal of a radar with its own signal on the same frequency but with a different ship from the radar pulse sequence. This also allows navigational aids, are not large enough to reflect the radar signal sufficient to be perceived by the radar. The response signal is in the form of a Morse character of a specific identifier, usually a single letter, that uniquely identifies the navaid.

The ID is displayed on the radar screen as Morse code, which starts in the navaids and points away from this in one line. This line has been on the radar screen a length of several miles. By displaying the direction and distance of the Racon beacon a precise determination of the ship is possible.

By means of identification, an object on the radar screen are then clearly identified as a navigation point. This also displays objects behind the Racon, it works intermittently, in which the response signal is disabled.

On charts navaids are with Racon devices usually with words " Racon (letter) " marked in magenta.

Racon beacons are situated on the coast where striking natural radar targets are missing.

History

The principle of the Racon was specified in the patent as early as 1904 by the German engineer Christian Hülsmeyer, but failed due to lack of technical conditions can not be realized (eg, electron tubes ). The theoretical development of the Racon something began in 1925 in the USA by Gregory Breit and Merle Tuve and Antony in the UK by Sir Edward Victor Appleton, Samuel Jackson Barnett and Sir Robert Watson-Watt. The technical development began some 1935 in the UK (after a Memorandum of over the air defense of Sir Watson- Watt), Germany and the USA. Before and at the beginning of the Second World War, then the Racon was brought to series production and introduced the mass production of devices.

Leading Racon

As a leading Racon or guidance radar beacons are called one after the other, the combination of two Racons. They call, brought into coverage, as fixed points of a straight line, for example, a safe unobstructed driveway with sufficient water depth.

Ramark

As Ramark or radar marker is referred to a Radarboje that emits a radar signal continuously in the form of a Morse sign. The broadcasting success in the frequency band of 3- cm radar ( 9320-9500 MHz). When the rotating radar antenna of a ship is directed to the Ramark -bake, then appears on the radar screen for a boundary running from the center Directive.

Aviation

In aviation, also radar response beacons are used. However, this secondary radar works there because of the strong signal of the response -Bake only with less power than a primary radar. In aviation, however, each of the planes ( the ATC transponder) equipped with its own response beacon towards actively respond to a signal of ground radar. A similar response principle is also used for friend -or-foe recognition of aircraft.