HI ,
I need gps accuracy 500 mm, is there any gps breakout board available. I searched over internet simcom808 available <2.5meter.
Please suggest me to select gps reciever !!!!!
Has nothing to do with the receiver. Has every thing to do with how many satellites the receiver can see and besides, the normal accuracy of GPS is about your 2.5 meters. Another gotcha is were you are on the planet. Russia no longer allows the USA to operate correction stations on their territory, so anywhere around Russia will have an even greater error.
The if you are in Australia, the continent is moving several inches a year, so GPS is even less accurate.
If you are developing for the US military, you will need a receiver for another whole set of frequencies and that will get you better accuracy, but nothing close to 500mm.
There is a possibility of averaging quite a few positions and getting closer, but a lot of time is necessary.
Paul
Read these and follow some of the links in the articles.
Thnaks for your replies. . .
As often is the case, I'm sure we're wondering why?
We are developing a project , Where user has to go and take Readings from each sample, What they are doing instead of going they make repeated readings from same sample. So we are making it false proof by reading their geolocation while taking each reading. Each sample will be placed Accurately 950 mm apart.
How do they take samples? Is that by plugging an Arduino into it or what?
I'm asking to try see if there's not an easier way to uniquely identify the user location. If for example they plug the sensor into the Arduino, then the data could include the sensors' id.
More than one way to do this I'm sure.
Sabarinathann, realize that (last time I looked into it ~ 4 months ago) differential gps services are not free. The best you can do from data that is freely available from the sky is ony good to a few meters. If you need frequent and cheap geolocation to a precision of less than a meter, you might want to consider techniques other than gps.