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There are two navigation message types: LNAV-L is used by satellites with PRN numbers 1 to 32 (called lower PRN numbers) and LNAV-U is used by satellites with PRN numbers 33 to 63 (called upper PRN numbers). [9] The two types use very similar formats. Subframes 1 to 3 are the same, [10] while subframes 4 and 5 are almost the same. Each message ...
A pseudo-noise code (PN code) or pseudo-random-noise code (PRN code) is one that has a spectrum similar to a random sequence of bits but is deterministically generated. The most commonly used sequences in direct-sequence spread spectrum systems are maximal length sequences , Gold codes , Kasami codes , and Barker codes .
Samples of three GPS satellites' orbits over a five-year period (2013 to 2018) USA-242 · USA-239 · USA-151 · Earth As of 22 January 2025, 83 Global Positioning System navigation satellites have been built: 31 are launched and operational, 3 are in reserve or testing, 43 are retired, 2 were lost during launch, and 1 prototype was never launched. 3 Block III satellites have completed ...
The C/A code, for civilian use, transmits data at 1.023 million chips per second, whereas the P code, for U.S. military use, transmits at 10.23 million chips per second. The actual internal reference of the satellites is 10.22999999543 MHz to compensate for relativistic effects [ 168 ] [ 169 ] that make observers on the Earth perceive a ...
USA-213, [1] also known as GPS SVN-62, GPS IIF SV-1 and NAVSTAR 65, is the first satellite in the Block IIF series of Global Positioning System navigation satellites. It will be used to relay signals for the United States Air Force Navstar Global Positioning System (GPS). [2] The satellite was launched at 03:00:00 UTC on 28 May 2010. [3]
Satellite [6] Launch date (UTC) Launch site Carrier rocket [7] PRN [8] Orbit [9] Status [8] [9] Remarks - BeiDou-1A 30 October 2000 16:02 Xichang, LC-2 Long March 3A: N/A GEO 140° E Retired December 2011: BeiDou-1, first generation experimental satellite - BeiDou-1B 20 December 2000 16:20 Xichang, LC-2 Long March 3A: N/A GEO 80° E Retired ...
Satellite Launch date/time (UTC) Carrier rocket Launch site Launch block Satellite type GC number Orbital plane [2] Slot [2] Status / Retirement [2] [a] [needs update] Kosmos 1413: 12 October 1982 14:57 Proton-K DM-2: Baikonur, Site 200/39: 1 I: 711 I 1 12 January 1984: Kosmos 1490: 10 August 1983 18:24 Proton-K DM-2: Baikonur, Site 200/39: 2 I ...
OCX Block 1 is an upgrade to OCX Block 0, at which time the OCX system achieves Initial Operating Capability (IOC). Once Block 1 is deployed, OCX will for the first time be able to command and control both Block II and Block III GPS satellites, as well as support the ability to begin broadcasting the civilian L1C signal. [18]