Calculating position from raw GPS data (2017)
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Re: Calculating position from raw GPS data (2017)
#2[deleted]
Re: Calculating position from raw GPS data (2017)
#3For anyone wanting to build their own GPS receiver, here's a fully open source project that explains a great deal of the theory too: http://www.aholme.co.uk/GPS/Main.htm
Re: Calculating position from raw GPS data (2017)
#4Here is another good open source implementation:
https://m.youtube.com/watch?v=dVD1Yws__v0
Re: Calculating position from raw GPS data (2017)
#5Alternate and maybe more interactive explanation:
https://ciechanow.ski/gps/
Re: Calculating position from raw GPS data (2017)
#6For anyone wanting to build their own GPS receiver, here's a fully open source project that explains a great deal of the theory too: http://www.aholme.co.uk/GPS/Main.htm
Just remember to intentionally handicap yourself as to not infringe upon ITAR restrictions.
Re: Calculating position from raw GPS data (2017)
#7[dead]
Re: Calculating position from raw GPS data (2017)
#8Android provides carrier phase access for a while now, and with that relative positioning between such devices in about the same neighborhood can be done with enough precision that you have to care about where in the device the GNSS antenna lurks.
That alone isn't too fancy; it gets good once you throw in the accelerometer and gyroscope in each device. Because with that you get this not only in realtime, but also with only minor degradation due to the changes in the GNSS pseudo-range measurements being predictable despite not holding still.
Other interesting things enabled by it are e.g. auto-land of a model plane in a truck bed without needing wheels on the plane (and still preventing it from getting scratched up/depending on a grass landing strip).
Even fairly good GNSS receivers aren't expensive to build, as long as power consumption isn't very critical, so why can't I just buy a pair for a hundred bucks?
Re: Calculating position from raw GPS data (2017)
#9Re: Calculating position from raw GPS data (2017)
#10For anyone wanting to build their own GPS receiver, here's a fully open source project that explains a great deal of the theory too: http://www.aholme.co.uk/GPS/Main.htm
Just remember to intentionally handicap yourself as to not infringe upon ITAR restrictions.
Can you explain what you mean by that? The only thing I can think of is that GPS has 2 modes : one civilian and other military use. But military use-case uses encryption so civilians can't use that mode anyway.