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Author Topic: Difference between the HOT, WARM, and COLD starts  (Read 2952 times)

GS_TECH01

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Difference between the HOT, WARM, and COLD starts
« on: June 13, 2012, 01:21:08 pm »

Please refer to this article that will help explain the difference between the HOT, WARM, and COLD starts: http://www.gsmarena.com/glossary.php3?term=gps
 
The hot start is when the GPS device remembers its last calculated position and the satellites in view, the almanac used (information about all the satellites in the constellation), the UTC Time and makes an attempt to lock onto the same satellites and calculate a new position based upon the previous information. This is the quickest GPS lock but it only works if you are generally in the same location as you were when the GPS was last turned off.

The warm start is when the GPS device remembers its last calculated position, almanac used, and UTC Time, but not which satellites were in view. It then performs a reset and attempts to obtain the satellite signals and calculates a new position.
The receiver has a general idea of which satellites to look for because it knows its last position and the almanac data helps identify which satellites are visible in the sky. This takes longer than a hot start but not as long as a cold start.

And finally the cold start is when the GPS device dumps all the information, attempts to locate satellites and then calculates a GPS lock. This takes the longest because there is no known information.
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