Abstract:The purpose of this paper is to provide a general overview of current and future GNSSand various applications. The role played by the current GNSS in our live is set to growconsiderably with new demands for more accurate information along with integrationinto various applications. The real impact of satellite global positioning on society andindustrial development became evident and innovative applications will be availablewhen a GALILEO constellation and modernization of both GPS and GLONASSbecome operational.There is a need to determine precise ground locations for use in a variety of innovativeand emerging applications such as earth observation, rescue applications, and mobilephonetechnology. Location information is pertinent to a large number of remotesensing applications, some of which support strategic tasks such as disastermanagement, earth monitoring, protecting the environment, management of naturalresources, and food production. With the availability of high-resolution images, someapplications will require a location precision down to 1 m. The GNSS provide signalsthat can serve this purpose.The traditional fields of application for GPS are shipping, aviation, detection,synchronization of telecommunications networks and security of the objects. However,the market is currently enjoying a growth in demand for electronic car navigationsystems which make better use of the road traffic network. Automatic Vehicle Location(AVL) and the fleets' management also appear to be growth rapidly. The advents of newsatellite systems as well as the modernization of the current satellite navigation systemsand the introduction of new frequencies are expected to contribute to the developmentof new techniques enabling precise positioning with less complexity and lower cost.The majority of satellite navigation applications are currently based on GPSperformances, and great technological developments are spent to integrate satellite
derived information with a number of other techniques in order to reach betterpositioning precision with improved reliability, accuracy and availability. With allelectronics technologies there is an endless challenge aims to improve the performanceof GNSS in signal acquisition, signal tracking, multi-path mitigation and interferencerejection while at the same time reducing size, power consumption and cost and addingsupport for more GNSS constellations.