How GPS works? – Part 1
As discussed in Part 1 of this series, NAVSTAR or what we now know as GPS started as a result of U.S. Navy’s determination to improve upon the Transit System. The proposal was made in 1973 and then from 1974-1977 system tests were carried out. The receiver tests were started in 1977 even before the satellites were in orbit. From 1978-1985, eleven satellites called as “Block 1” were launched. In 1989, another set of “Block II” satellites were launched. Currently there are 24 satellites in orbit being actively used and another 4 satellites as spares. Most of the satellites now in use are from Block II and Block IIA.
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