Post : Real time GPS decoding with software defined radio
URL : http://hackaday.com/2012/08/19/real-time-gps-decoding-with-software-defined-radio/
Posted : August 19, 2012 at 6:01 am
Author : Brian Benchoff
Tags : gps, RTLSDR, software-defined radio
Categories : news, radio hacks

http://hackadaycom.files.wordpress.com/2012/08/gps.jpg

In case the Realtek RTL2832u-based USB TV tuner dongle isn't useful enough, the folks behind a project to get a software defined GPS receiver off the ground successfully plotted GPS data in real-time (http://www.gnss-sdr.org/documentation/gnss-sdr-operation-realtek-rtl2832u-usb-dongle-dvb-t-receiver) with this very inexpensive radio.

Previously, we've seen these dongles grab data from GPS satellites (http://hackaday.com/2012/04/13/those-usb-tv-tuners-used-for-sdr-can-also-grab-gps-data/) - useful if you're building a GPS-based clock - but this build required hours of data collection to plot your location on a map.

The folks working on the GNSS-SDR project used an RTL2832 USB TV tuner and a Garmin active GPS antenna to track up to four GPS satellites in real-time and plot a location accurate to about 200 meters.

The Google Earth plot for this post shows the data collected by the GNSS-SDR team; the antenna was fixed at the red arrow for the entirety of the test, and the yellow lines represent a change in the calculated location every 10 seconds. Amazing work, and only goes to show what this remarkable piece of hardware is capable of.

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