Title: Satellite navigation - Wikipedia
Headings: Satellite navigation
Satellite navigation
Contents
Classification
History and theory
Applications
Global navigation satellite systems
GPS
GLONASS
BeiDou
Galileo
Regional navigation satellite systems
NavIC
QZSS
Comparison of systems
Augmentation
Related techniques
DORIS
LEO satellites
See also
Notes
References
Further reading
External links
Information on specific GNSS systems
Organizations related to GNSS
Supportive or illustrative sites

Content: Regional Satellite Navigation Systems such as India's NAVIC, and Japan's QZSS. Continental scale Ground Based Augmentation Systems (GBAS) for example the Australian GRAS and the joint US Coast Guard, Canadian Coast Guard, US Army Corps of Engineers and US Department of Transportation National Differential GPS (DGPS) service. Regional scale GBAS such as CORS networks. Local GBAS typified by a single GPS reference station operating Real Time Kinematic (RTK) corrections. As many of the global GNSS systems (and augmentation systems) use similar frequencies and signals around L1, many "Multi-GNSS" receivers capable of using multiple systems have been produced. While some systems strive to interoperate with GPS as well as possible by providing the same clock, others do not. History and theory
Ground based radio navigation is decades old. The DECCA, LORAN, GEE and Omega systems used terrestrial longwave radio transmitters which broadcast a radio pulse from a known "master" location, followed by a pulse repeated from a number of "slave" stations. The delay between the reception of the master signal and the slave signals allowed the receiver to deduce the distance to each of the slaves, providing a fix . The first satellite navigation system was Transit, a system deployed by the US military in the 1960s.