Earliest ,GPS tracker because
accept ability is weak, always broken, to be used for navigation, especially in
the city to travel caused many inconvenience. Later development some civilian
GPS chip, the signals are not strong in the GPS signal is income, thus causing
the drift phenomenon.
Xtrac technology of GPS signal will be gone
with the wind are most frequently happened problems (Gao Gan degrees of GPS is
mostly use Xtrac technology, GM - 270 - u), because it is the use of computing
to locate the weak signal amplification, and the satellite signal all the time
change, so the GPS continuous operation to correct error, when the received
signal before and after very different, you will see the drift phenomenon.
Navigation software is only receive signals from the GPS, the positioning signal
appeared on the screen, so it has nothing to do with the signal drift, is
purely a GPS receiver position error.
Moreover, the error of the GPS who number
is 5 ~ 25 meters, lock road map software programming is about, of course, but
the receiver factor is larger.
Last used GPS coordinates system and the
electronic map coordinates system (rare) are the same?
GPS cold startup, warm startup, warm start
GPS trackers boot is divided into cold
start and warm start and hot start:
Cold start, the following several ways on
cold start. Used for the first time; Ephemeris information loss, as a result of
its battery runs out; Shutdown condition. Move the receiver more than 1000 km
distance.
Start temperature: distance from the last
location for more than two hours started.
Thermal activation: distance positioning
time is less than two hours to start last time.
