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While originally a military project, GPS is considered a dual-use technology, meaning it has significant civilian applications as well. GPS has become a widely deployed and useful tool for commerce, scientific uses, tracking, and surveillance.
Announcements from the Vice President and the White House in 1998 heralded the beginning of these changes, and in 2000, the U.S. Congress reaffirmed the effort, referred to as GPS III. The project involves new ground stations and new satellites, with additional navigation signals for both civilian and military users.
A Selective Availability Anti-spoofing Module (SAASM) is used by military Global Positioning System receivers to allow decryption of precision GPS observations, while the accuracy of civilian GPS receivers may be reduced by the United States military through Selective Availability (SA) and anti-spoofing (AS). [1]
L1C is a civilian-use signal, to be broadcast on the same L1 frequency (1575.42 MHz) that contains the C/A signal used by all current GPS users. L1C broadcasting started when GPS III Control Segment (OCX) Block 1 becomes operational, scheduled for 2022.
As of 2013, there are 950 satellites of all types in Earth orbit. It is not possible to identify the exact number of these that are military satellites partly due to secrecy and partly due to dual purpose missions such as GPS satellites that serve both civilian and military purposes. As of December 2018 there are 320 known military or dual-use ...
Blue force tracking is a United States military term for a GPS-enabled capability that provides military commanders and forces with location information about friendly (and despite its name, also hostile) military forces. In NATO military symbology, blue typically denotes friendly forces. The capability provides a common picture of the location ...
GPS is owned by the U.S. government and is run by the U.S. Space Force, but there's also Russia's GLONASS, China's BeiDou, and the European Union's system, Galileo.
The United States' Global Positioning System (GPS) consists of up to 32 medium Earth orbit satellites in six different orbital planes. The exact number of satellites varies as older satellites are retired and replaced. Operational since 1978 and globally available since 1994, GPS is the world's most utilized satellite navigation system.
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