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Navigating into the Future-What GPS has in Store

Global Navigation Satellite (GPS) system has gradually come of age and has found itself a place as standard Navigation equipment in most aircraft. However, data from a GPS Receiver is not reliable enough for it to be used as a primary or sole source of navigation information. As a result GPS only system is allowed to be used only as a supplemental means of navigation for aircraft in the less critical situations such as en-route, terminal and nonprecision approach stages of flight. All that is about to change with the advent of SBAS and GBAS. Space Based Augmentation System (SBAS) provides the much needed reliability assurances to the solution from the GPS, in addition to the improvement of accuracy and availability of the solution. The SBAS, gives the all important integrity by bounding the errors from the GPS. It improves the accuracy of the solution by providing differential corrections. It also enhances the availability of solution by providing one additional ranging signal. The addition of SBAS to GPS allows the integrated GPS-WAAS system to be used as the primary means of navigation for en-route, terminal, non-precision approach as well as Cat I precision approach mode of operations. The paper presents a general overview of the GPS based system and its modernization to cope up with the future navigation with some details of a GPS-WAAS receiver being developed.