Software defined radio (SDR) appears as a\ua0suitable solution for dedicated GNSS reflectometry (GNSS-R)\ua0applications. Not only does the flexibility of SDR allow for\ua0easy and rapid prototyping, but also do recent technological\ua0developments of SDR front-ends support real-time operation\ua0of GNSS-R. Our presentation includes a discussion about the\ua0technical aspects of SDR for GNSS-R and we show results\ua0from a ground-based GNSS-R SDR receiver which was\ua0operated continuously over a more than a month at the\ua0Onsala Space Observatory. A summary of our current\ua0activities in relation to airborne GNSS-R solutions and initial\ua0results in the form of Delay-Doppler Maps (DDMs) will\ua0conclude the presentation
