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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. The transmitter computes the distances to the beacons and a computer, connected with the transmitter, computes the
119:, can change. In wet conditions, rain or snow, the wave propagation is a little bit slower than in dry conditions. So that gives an inaccuracy in determining the correct position of the vessel.
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The
Syledis system has a measurement sensitivity that can be expressed in centimeters. Due to weather conditions the wave propagation speed, for electromagnetic waves in air almost the
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and the cable(s) to connect the antenna with the transmitter at the vessel. Normally the antenna will be placed at the top of the mast and the transmitter will be placed in the
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47:, and was operational during the 1980s and until about 1995, providing positioning and navigational support for the petroleum sector in the
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to determine the origin of the returned code. Therefore, in an earlier stage a specified timeslot is connected to a specific beacon.
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each placed at a known point. The beacons send the code back to the transmitter. The returned coded signal is placed in a
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A vessel is equipped with a transmitter that transmits a coded signal to at least three
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Another important factor is the length of the cables used to connect the
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Further explanation of the functioning of the
Syledis positioning system
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and to other scientific projects. Syledis has been replaced by
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Manual of
Offshore Surveying for Geoscientists and Engineers
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Determination of the position of mobile vehicles, like f.e.
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with the radio beacons at the shore, for example placed on
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79:at known points. There are two modes of operation,
211:This article related to radio communications is a
67:, using Syledis is accomplished by measurement of
35:and locating system. The system operated in the
194:. Vol. 89. Dorset House. 1983. p. 73.
39:segment of 420-450 MHz. It was manufactured in
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8:
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111:Possible causes for measurement inaccuracy
142:in order to obtain the smallest possible
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215:. You can help Knowledge (XXG) by
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43:by Sercel S.A., headquarters
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287:Radio communications stubs
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85:passive pseudo-range mode
31:tance) was a terrestrial
107:position of the vessel.
144:measurement uncertainty
272:Ubiquitous computing
156:R.P. Loweth (1997).
75:between mobiles and
27:ger pour mesure la
164:Chapman & Hall
277:Wireless locating
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132:oil rig platforms
81:active range mode
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267:Radio navigation
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162:(1st ed.).
33:radio navigation
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69:transit time
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262:Measurement
128:lighthouses
73:radio waves
59:Functioning
256:Categories
150:References
140:calibrated
136:wheelhouse
49:North Sea
45:Carquefou
182:96-72156
130:, or on
124:antennas
101:timeslot
65:vessels
17:Syledis
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41:France
23:stem
213:stub
178:LCCN
168:ISBN
83:and
71:of
53:GPS
37:UHF
29:DIS
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25:LE
21:SY
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19:(
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