Syledis
Encyclopedia
Syledis was a terrestrial radio navigation
and locating system. The system operated in the UHF segment of 420-450 MHz. Operational during the 1980s and until about 1995, it provided positioning and navigational support for the petroleum sector in the North Sea
.
Syledis has been replaced by GPS.
, is usually accomplished by measurement of transit time of radiowaves
between mobiles and radiostations at known points.
each placed at a known point. The beacons send the code back to the transmitter. The returned coded signal is placed in a timeslot to determine the origin of the returned code. Therefor in an earlier stage a specified timeslot is connected to a specific beacon.
The elapsed time is proportional to twice the distance between the transmitter and the beacons. After the distance to the beacons is derived the position of the vessel can be calculated. That is true.
Radio navigation
Radio navigation or radionavigation is the application of radio frequencies to determine a position on the Earth. Like radiolocation, it is a type of radiodetermination.The basic principles are measurements from/to electric beacons, especially...
and locating system. The system operated in the UHF segment of 420-450 MHz. Operational during the 1980s and until about 1995, it provided positioning and navigational support for the petroleum sector in the North Sea
North Sea
In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...
.
Syledis has been replaced by GPS.
Functioning
Determination of the position of mobile vehicles, like f.e. vesselsWatercraft
A watercraft is a vessel or craft designed to move across or through water. The name is derived from the term "craft" which was used to describe all types of water going vessels...
, is usually accomplished by measurement of transit time of radiowaves
Radiowaves
Radiowaves is the final studio album by Norwegian rock band Seigmen. It is sung entirely in English. The album came in two editions: a limited edition black jewel case, and a transparent jewel case.-Track listing:# "Performance Alpha" - 4:42...
between mobiles and radiostations at known points.
Further explanation of the functioning of the Syledis positioning system
A vessel is equipped with a transmitter that transmits a coded signal to at least three radio beaconsElectric beacon
Electric beacons are a kind of beacon used with direction finding equipment to find ones relative bearing to a known location .The term electric beacon includes radio, infrared and sonar beacons.- Radio beacons :...
each placed at a known point. The beacons send the code back to the transmitter. The returned coded signal is placed in a timeslot to determine the origin of the returned code. Therefor in an earlier stage a specified timeslot is connected to a specific beacon.
The elapsed time is proportional to twice the distance between the transmitter and the beacons. After the distance to the beacons is derived the position of the vessel can be calculated. That is true.