Cheap Gps Receiver

Differential GPS - ... a network of fixed ground based reference stations to broadcast the difference between the positions indicated by the satellite systems and the known fixed positions. These stations broadcast the difference between the measured satellite pseudoranges and actual (internally computed) pseudoranges, and receiver stations may correct their pseudoranges by the same amount.

RAIM - RAIM is the abbreviation for Receiver Autonomous Integrity Monitoring, a technology developed to assess the integrity of GPS signals in a GPS receiver system. It is of special importance in safety-critical GPS applications, such as in aviation or marine applications.

Wide Area Augmentation System - The Wide Area Augmentation System (WAAS) is a system that improves the precision and accuracy of global positioning system (GPS) signals. It uses a combination of specialized satellites and ground-based stations to send correction signals to GPS receivers, as well as providing integrity information for each satellite's signal, equivalent or better than RAIM (receiver autonomous integrity monitoring), thereby improving the accuracy of the GPS signal by approximately 5 times.

Location-based service - A location-based service (or LBS) in a cellular telephone network is a service provided to the subscriber based on their current geographical location. This position can be known by user entry or a GPS receiver that she carries with her, but most often the term implies the use of a radiolocation function built into the cell network or handset that uses triangulation between the known geographic coordinates of the base stations through which the communication takes place.

cheapgpsreceiver

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