GPS Yuma Almanacs. Latest Yuma Almanac Definition of a Yuma Almanac. GPS Yuma Almanacs. 1990 1991 1992 1993 1994 1995. Latest Almanac Data, Global Reference Station List, Beacon Reference Station List, EGNOS. GPS/GLONASS almanac in Trimble Planning file format.
Time to first fix (TTFF) is a measure of the time required for a GPS navigation device to acquire satellite signals and navigation data, and calculate a position solution (called a fix).
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An animation depicting the orbits of GPS satellites in medium earth orbit.
Scenarios[edit]
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. After acquiring a satellite signal, the receiver can begin to obtain approximate information on all the other satellites, called the almanac. This almanac is transmitted repeatedly over 12.5 minutes. Almanac data can be received from any of the GPS satellites and is considered valid for up to 180 days. Manufacturers typically claim the factory TTFF to be 15 minutes.
- Warm or normal: The receiver has estimates of the current time within 20 seconds, the current position within 100 kilometers, and its velocity within 25 m/s, and it has valid almanac data. It must acquire each satellite signal and obtain that satellite's detailed orbital information, called ephemeris data. Each satellite broadcasts its ephemeris data every 30 seconds, and is valid for up to four hours.
- Hot or standby: The receiver has valid time, position, almanac, and ephemeris data, enabling a rapid acquisition of satellite signals. The time required of a receiver in this state to calculate a position fix may also be termed Time to Subsequent fix (TTSF)
Many receivers can use as many as twelve channels simultaneously, allowing quicker fixes.[1] Many cell phones reduce the time to first fix by using assisted GPS (A-GPS): they acquire almanac and ephemeris data over a fast network connection from the cell phone operator rather than over the slow radio connection from the satellites.
See also[edit]
- Global Positioning System (GPS)
References[edit]
External links[edit]
- US Coast Guard, Navigation Center's NAVSTAR GPS User Equipment Introduction.
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Time_to_first_fix&oldid=908060563'
What is GPS Pathfinder Office?
The GPS Pathfinder is a software package of post-processing tools of the GNSS. It incorporates Trimble DeltaPhase correction technology, developing GIS information that is consistent from collected GNSS data. It has control features that are critical for enterprise GIS data development. Data can be analyzed to check if they are free from errors.
The GPS Pathfinder also includes an Integrity Index grading system, ensuring that GNSS field data is corrected using the base station data. It supports Trimble mapping, as well as associated positioning technologies. Data can be imported to Trimble GPS Pathfinder Office software, from GIS and database formats. The Data Dictionary Editor creates a list of attributes for field data collection. Data that is collected in the field will merge with the GIS repository and the returned data will be accurate. Users can also create a data dictionary for this purpose.
The GPS Pathfinder also includes an Integrity Index grading system, ensuring that GNSS field data is corrected using the base station data. It supports Trimble mapping, as well as associated positioning technologies. Data can be imported to Trimble GPS Pathfinder Office software, from GIS and database formats. The Data Dictionary Editor creates a list of attributes for field data collection. Data that is collected in the field will merge with the GIS repository and the returned data will be accurate. Users can also create a data dictionary for this purpose.
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File types supported by GPS Pathfinder Office
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