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4

If it's possible, use your GPS unit to get position & elevation of a known benchmark and then compare that with the official values. Here is a picture of a USGS benchmark. If you can't find the locations of any near you, just contact your USGS local office. If you cannot access benchmarks, see if there is some structure that you can get precise ...


3

If you know the exact position of the receiver then it is possible to do timing with only one satellite. Essentially GPS is solving four unknowns (ECEF position, and receiver clock error) with four (pseudo-range) distance measurements, so if you can provide three unknowns, you only need one measurement. Not all receivers support this though - it was a ...


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From my experience at a place where I used to work, they used a company that placed GPS units with cellular modems that were also attached to other vehicle sensors. The unit was programmed to send its location and sensor information over the cellular network to the company's server every 5 minutes I believe. The reason this was done is because they charged ...



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