What is the difference between Beidou/GPS positioning module cold start, hot start and warm start?

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1. Cold start **
　　Under what conditions does GPS start cold? When the device is shut down for more than 4 hours, or the device moves more than 200 kilometers in the state of light and machine, because the GPS satellite ephemeris parameters in the sky have changed, the device needs to download the ephemeris again when it is turned on.
2. Hot start
　　Under what conditions does GPS hot start? After shutting down and restarting in less than 2 hours, the ephemeris saved by the previous module is still valid. The chip can directly use the saved ephemeris without downloading the ephemeris.
3. Warm start 　　 The start
　　is more than two hours since the last positioning. GPS saves the last calculated satellite position, almanac and UTC time, but the saved content is not the data of the currently visible satellite. After GPS restarts, try to obtain the current satellites and signals and calculate its new position.
　　
A table to thoroughly understand what is cold start, hot start, warm start

** 4. Grindel UBLOX ZED F9P module
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