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The objective of NAVCOM is the development and demonstration of an Integrated Navigation / Mobile Communication User Terminal based on the TETRAPOL system. TETRAPOL is a fully-secured-digital solution designed to meet the growing needs and expectations of highly-demanding Professional Mobile Radio (PMR) users such as public safety forces, transport, or industry. In the context of these applications, the user requirements have been defined in terms of equipment features (size, low-power, low-cost, etc) and the quality of service (accuracy, service availability, frequency of location update, etc).
The key issues of the Integrated GNSS and Mobile Communication Terminal project are:
Demonstration Test Results
The demonstration tests are carried out mainly to point out the benefit of EGNOS regarding the improvement of the absolute positioning accuracy. Thus, combined GPS/EGNOS positioning is compared to GPS stand alone positioning. The reference is generated by a geodetic GPS receiver with an absolute accuracy of about 2-5 cm. Additionally, the position messages are transferred to the AVL server at EADS by using the TETRAPOL communication link. Thus, on the display of the AVL server, the location of the measurement vehicle can be visualized and the trajectory points are stored in a database.
The tests show clearly the significantly improved positioning accuracy of combined GPS/EGNOS positioning and that nearly hundred percent of the generated position messages are received at the AVL server. Only if the communication link is shadowed (e.g. due to interferences, etc.), the generated position messages are not transmitted to the AVL server.
The objective of this project is to develop and demonstrate an Integrated navigation/Mobile Communication User Terminal based on the TETRAPOL system.
The main task of the NAVCOM project is the integration of a GPS/EGNOS receiver into an existing TETRAPOL mobile communication unit. This Integrated Terminal will supply the actual and valorised position information via the TETRAPOL communication network to an AVL Server. A user is able to track and guide several IT's on an AVL display and communicate with them via the voice and data channel of the TETRAPOL system. The navigation module is able to acquire assisted GPS and assisted EGNOS information via the communication system in case that the clear view to the satellites is obstructed.
The communication part of the project is under the responsibility of EADS Telecom, whereas the navigation part is implemented by IMST, Fraunhofer and IFEN. TeleConsult is responsible for the demonstration phase.
Phase 1: Setting the Requirements:
Phase 1 of the NAVCOM project started with the definition and identification of the requirements of the applications Security / Police, Search / Rescue and Emergency Call (E 112) regarding an integrated navigation - mobile communication system. In the sequel the Integrated Terminal was defined and the requirement onto a GNSS/EGNOS receiver module settled. During the review meeting the specifications for the integrated navigation / communication user terminal were formally agreed.
Phase 1 and Phase 2 have been completed successfully. The project was closed in course of the Final Review in October 2007.