GPS boot positioning includes cold start, warm start and hot start: Cold start: The following cases are cold start. When first used; The ephemeris information is lost due to battery depletion; Mo
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GPS boot positioning includes cold start, warm start and hot start:
Cold start: The following cases are cold start. When first used; The ephemeris information is lost due to battery depletion; Move the receiver for more than 1000 km in the shutdown state.
Warm start: start when the time from the last positioning is more than two hours.
Hot start: start when the time from the last positioning is less than two hours.
Sometimes, if the machine has software problems, cold start is required, and cold start can be carried out.
At present, there are mainly 3 kinds of main chips on GPS modules (OEM boards) commonly used (common/popular) in the world.
(1) American SIRF (Sirf)
(2) SONY (Sony Ericsson/Sony Ericsson) chip
(3) NEMERIX chip of NENEM, Switzerland
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