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Thank you KlausSt,
Yes you are right, but as you get familiar with different sensors by reading their datasheet you can make a good decision. I am grateful if anyone can help me.
For compass, I have only used Honeywell and ST. They both seems to work fine for a dead reckoning project. For GPS, I have only used Ublox. There are other cheaper units from MStar.
Dear paulfjujo, I really appreciate your explanation.
Some of my friends used Ublox GPS and they told me, in some situations they need more than 2 minutes to track the GPS satellites or need to reset the module, Did you encounter with this issue?
at the first run of GPS, yes, it need 2 or 3 minutes to get all satellites in view.
it is a normal way for all GPS ..
GPS store the last position, to speed up, next calculations.
U-Center is a good tool to check all parameters to have the best initialising status.
After , even doing power off and power ON, it need's only a fews secondes to get back the position
if you are in same place ..
GPS can gives a quality indicator , depends of the number of satellites discovered and theyre power signal.
if weather is very cloudy, it's needs more time , because less satelites in the view.
But i never get issue wich oblige to reset the GPS.
Maybe considere also the application using the GPS !
Dear paulfjujo, I really appreciate your explanation.
Some of my friends used Ublox GPS and they told me, in some situations they need more than 2 minutes to track the GPS satellites or need to reset the module, Did you encounter with this issue?
Like what paulfjujo said, there are three different start options; hot, warm and cold start. These values varies between manufacturers. Most GPS chipset uses the standard NMEA protocol but ublox uses both NMEA and their propriety UBX which is a binarized protocol with fletcher checksum. If you are worried about startup time, you could create a dead reckoning system as well using compass, speed. I based the calculation on this website; https://www.movable-type.co.uk/scripts/latlong.html. For compass you would have to calibrate it depends on your casing or inside a car.
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