@article{Ambroziak_Katulski_Sadowski_Siwicki_Stefanski_2011, author = {Ambroziak, Slawomir Jerzy and Katulski, Ryszard and Sadowski, Jaroslaw and Siwicki, Wojciech and Stefanski, Jacek}, title = {Ground-based, Hyperbolic Radiolocation System with Spread Spectrum Signal - AEGIR}, journal = {TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation}, volume = {5}, number = {2}, pages = {233-238}, year = {2011}, url = {./Article_Ground-based,__Hyperbolic_Radiolocation_Ambroziak,18,289.html}, abstract = {At present the most popular radiolocation system in the world is Global Positioning System (GPS).As it is managed by the Department of Defence of the U.S.A., there is always the risk of the occasional inaccuracies or deliberate insertion of errors, therefore this system can not be used by secret services or armies of countries other than the U.S.A. This situation has engender a need for development of an autonomous, ground-based radiolocation system, based on the hyperbolic system with spread spectrum signals. This article describes the construction and operation of such a system technology demonstrator which was developed at the Technical University of Gdansk. It was named AEGIR (god of the ocean in Norse mythology). This paper presents preliminary results and analysis of its effectiveness.}, issn = {2083-6473}, publisher = {Gdynia Maritime University, Faculty of Navigation}, keywords = {Positioning System, Hyperbolic Radiolocation System, Spread Spectrum Signal, Ground-Based Radiolocation System, Global Positioning System (GPS), Hyperbolic System, Basic Navigation Message (BNM), Additional Navigation Message (ANM)} }