I've read through a few discussions on this forum about poor man's DGPS and getting relative accuracy down to the ~1m range. It seems no one's having much luck even with identical GPS units. I'm wondering if anyone has manged this and what are your thoughts on what I'm currently building.
I'm laying out a PCB for a ublox LEA-6T (that's the one that outputs raw data and carrier phase) to interface to a MCU and a 433MHz radio. That's the mobile unit. My base station is then a single board computer with it's own LEA-6T, radio, and software running GPSTk post-processing software. The mobile board will then radio the raw data (subframes 1 and 2 and psuedo range and carrier info) to my base station. Base station code then chooses a set of sattellites that work well for both units and calculates position of both units using the same satallites and same ephemeris data. (calculated position could then be radioed back to mobile unit)
The units are genearlly pretty close to each other (spatially) so the only error here should be that inherent to the ublox measuring psuedorange--no constellation, algorithm, iono/troposphere, ephemeris differences.
Has anybody tried this? Do you think I can get a relative accuracy of ~1m?
Thanks for any thoughts guys and gals!