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Gold code. A Gold code, also known as Gold sequence, is a type of binary sequence, used in telecommunications (CDMA) [1] and satellite navigation (GPS). [2] Gold codes are named after Robert Gold. [3][4] Gold codes have bounded small cross-correlations within a set, which is useful when multiple devices are broadcasting in the same frequency range.
The C/A PRN codes are Gold codes with a period of 1023 chips transmitted at 1.023 Mchip/s, causing the code to repeat every 1 millisecond. They are exclusive-ored with a 50 bit/s navigation message and the result phase modulates the carrier as previously described .
Gold Codes. The Gold Code is the launch code for nuclear weapons provided to the President of the United States in their role as commander-in-chief of the armed forces. [1] In conjunction with the nuclear football, the Gold Codes allow the president to authorize a nuclear attack. [2] Gold Codes, as well as a separate nuclear football, are also ...
The Global Positioning System (GPS), originally Navstar GPS, [2] is a satellite-based radio navigation system owned by the United States Space Force and operated by Mission Delta 31. [3] It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near the Earth where ...
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.
All GPS satellites broadcast on the same two frequencies, known as L1 (1575.42 MHz) and L2 (1227.60 MHz). The network uses code-division multiple access (CDMA) to allow separate messages from the individual satellites to be distinguished. Two distinct CDMA encodings are used: the coarse/acquisition (C/A) code, which is accessible by the general ...
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Samples of three GPS satellites' orbits over a five-year period (2013 to 2018) USA-242 · USA-239 · USA-151 · Earth As of 15 August 2023, 83 Global Positioning System navigation satellites have been built: 31 are launched and operational, 3 in reserve or testing, 42 are retired, 2 were lost during launch, and 1 prototype was never launched. 4 Block III satellites have completed construction ...
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