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In the field of geodesy, Receiver Independent Exchange Format (RINEX) is a data interchange format for raw satellite navigation system data. This allows the user to post-process the received data to produce a more accurate result — usually with other data unknown to the original receiver, such as better models of the atmospheric conditions at time of measurement.
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.
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. [4]
A set of Gold codes can be generated with the following steps. Pick two maximum length sequences of the same length 2 n − 1 such that their absolute cross-correlation is less than or equal to 2 (n+2)/2, where n is the size of the linear-feedback shift register used to generate the maximum length
Field name Index (Bytes) Purpose Start-of-frame: 0: Denotes the start of frame transmission (v1.0: 0xFE) Payload-length: 1: length of payload (n) Packet sequence
generator control unit GDOP Geometric dilution of precision GEA Ground effect area: GGS Global positioning system ground station GHz Gigahertz: GLOC g-induced loss of consciousness "g" Is acceleration relevant to the acceleration caused by gravity GLONASS Global Navigation Satellite System: Or GNSS GLNS GPS Landing and Navigation System GLNU
NMEA 0183 is a combined electrical and data specification for communication between marine electronics such as echo sounder, sonars, anemometer, gyrocompass, autopilot, GPS receivers and many other types of instruments.