First proof-of-concept: A GPS Fix in Windows using an RTL-SDR stick

Both packages are Open Source (GPL2 and BSD 2-clause, respectively). The default build target for both packages is Windows, although RTKLIB has been compiled under Linux.

1. Ensure RTL-SDR stick is working in Windows. If your driver is not working, try using the Zadig driver installation method outlined here.
2. Install GNSS-SDRLIB and RTKLIB to any convenient directory
3. Open GNSS-SDRGUI and select the following options
   1. Input Type: RTL-SDR
   2. [x] RTCM MSM, Port 9999
   3. Change “output interval” dropdown to 10 hz
   4. [x] Plot Tracking
   5. [x] All GPS, GLOSNASS, Galileo satellites
   6. (optional) enter approximate lat/lon into MISC and click the “…” button to get  current satellite locations in relation to your location.
4. Click “Start”, a number of command consoles will open then close for each satellite being tracked.
5. Click “M” for log
6. Now, open RTKNAVI
   1. Click on the “I” button
      1. check “rover”, type TCP Client, format RTCM3
      2. click OPT button and set address to “localhost” and port to “9999”
      3. click OK
      4. Click OK
   2. Click on the “start” button
   3. Within a few seconds you should see satellites in the Rover:Base SNR pane
   4. Once a solution exists it will update lat/lon in the left pane
   5. Click “Plot” to generate a plot of the random walk of lat/lon over time