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Global Positioning System: Difference between revisions
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GPS receivers may include an input for differential corrections, using the [[RTCM]] SC-104 format. This is typically in the form of a [[RS-232]] port at 4,800 bps speed. Data is actually sent at a much lower rate, which limits the accuracy of the signal sent using RTCM. Receivers with internal DGPS receivers can outperform those using external RTCM data. As of 2006, even low-cost units commonly include [[Wide Area Augmentation System|WAAS]] receivers. | GPS receivers may include an input for differential corrections, using the [[RTCM]] SC-104 format. This is typically in the form of a [[RS-232]] port at 4,800 bps speed. Data is actually sent at a much lower rate, which limits the accuracy of the signal sent using RTCM. Receivers with internal DGPS receivers can outperform those using external RTCM data. As of 2006, even low-cost units commonly include [[Wide Area Augmentation System|WAAS]] receivers. | ||
Many GPS receivers can relay position data to a PC or other device using the [[NMEA 0183]] protocol. [[NMEA 2000]]<ref>[[NMEA]] [http://www.nmea.org/pub/2000/index.html NMEA 2000]</ref> is a newer and less widely adopted protocol. Both are [[proprietary]] and controlled by the US-based National Marine Electronics Association. References to the NMEA protocols have been compiled from public records, allowing open source tools like [[gpsd]] to read the protocol without violating | Many GPS receivers can relay position data to a PC or other device using the [[NMEA 0183]] protocol. [[NMEA 2000]]<ref>[[NMEA]] [http://www.nmea.org/pub/2000/index.html NMEA 2000]</ref> is a newer and less widely adopted protocol. Both are [[proprietary]] and controlled by the US-based National Marine Electronics Association. References to the NMEA protocols have been compiled from public records, allowing open source tools like [[gpsd]] to read the protocol without violating intellectual property laws. Other proprietary protocols exist as well, such as the [[SiRF]] protocol. Receivers can interface with other devices using methods including a serial connection, [[Universal Serial Bus|USB]] or [[Bluetooth]]. | ||
=== Navigation signals === | === Navigation signals === | ||
