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By Adam Weintrit

The TransNav 2011 Symposium held on the Gdynia Maritime collage, Poland in June 2011 has introduced jointly quite a lot of individuals from around the world. this system has provided a number of contributions, permitting to examine many elements of the navigational defense from quite a few diversified issues of view. issues awarded and mentioned on the Symposium have been: navigation, safeguard at sea, sea transportation, Read more...

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This paper is organized as follows: in section 2, we briefly introduce the AIS system, Inmarsat-C polling service and China Beidou navigation satellite system; in section 3, we describe the architecture of the vessel tracking system; in section 4 we give out the running results and conclusions. 1 The Automatic Identification System The Automatic Identification System is an automated tracking system used on vessels and Vessel Traffic Services (VTS) for identifying and locating vessels by electronically exchanging data with other nearby ships or VTS stations.

This predetermined address could be an internet email address, a telex, a telephone-modem and so on. Data reports make efficient use of the InmarsatC system. Data packets limited to a maximum of 256 bits 㸦32 bytes㸧are transmitted via signaling channels of the Inmarsat-C network. Time and cost are saved by avoiding switching to a messaging channel. Data report can be sent directly from a Cterminal or command with a poll. Most C-terminal can transmit Data Reports manually by means of an operator or be programmed for automatic transmission at pre-set intervals.

Tioning in truly remote areas from reference stations such as in the middle of the oceans. Typical 24 hour monitoring results from the HP system operating in dynamic mode at Lafayette, USA, on the Gulf of Mexico coast, using four reference stations with the distances ranging from 350 km to more than 1000 km, observed on January 23, 2011 are shown in Figure 2. The position accuracy given in terms of standard deviation is 3, 3 and 5 cm, for longitude, latitude and height, respectively. Figure 2. HP Position Results, Lafayette, January 23, 2011 HP solution was also extensively tested at various locations and over an extended time.

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