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The navigation message consists of 30-second frames 1,500 bits long, divided into five 6-second subframes of ten 30-bit words each. Each subframe has the GPS time in 6-second increments. Subframe 1 contains the GPS date (week number), satellite clock correction information, satellite status and satellite health.
The TTFF is commonly broken down into three more specific scenarios, as defined in the GPS equipment guide: Cold or factory The receiver is missing or has inaccurate estimates of its position, velocity, the time, or the visibility of any of the GPS satellites. As such, the receiver must systematically search for all possible satellites.
GPS signals can also be affected by multipath issues, where the radio signals reflect off surrounding terrain; buildings, canyon walls, hard ground, etc. These delayed signals cause measurement errors that are different for each type of GPS signal due to its dependency on the wavelength.
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RAIM is considered available if 24 GPS satellites or more are operative. If the number of GPS satellites is 23 or fewer, RAIM availability must be checked using approved ground-based prediction software. Several GPS-related systems also provide integrity signals separate from GPS.
In GPS technology, the term "CoCom Limits" also refers to a limit placed on GPS receivers that limits functionality when the device calculates that it is moving faster than 1,000 knots (510 m/s) and/or at an altitude higher than 12,000 m (39,000 ft). [20]
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The term can also be applied to other location systems that employ several geographical spaced sites. It can occur in electronic-counter-counter-measures ( electronic warfare ) when computing the location of enemy emitters ( radar jammers and radio communications devices).