Ground-based GNSS reflectometry (GNSS-R)
systems can be realized by different means. The concept of
correlation between direct and reflected GNSS signals is basically
possible with all GNSS systems. However, using signals from
the Russian GLONASS system simplifies the signal processing
so that software-defined radio (SDR) components can be used
at replace expensive hardware solutions. This paper discusses
how such a solution, called GLONASS-R, can be realized using
entirely off-the-shelf components. Field tests with such a system
demonstrate the capability to monitor sea surface heights with a
precision of 3 cm or better even with a sampling rate of 1.5 Hz.
The flexibility of a SDR and the simple concept of GLONASS-R
allow build such a system with low costs and adapt it to the needs
of any ground-based GNSS-R problem
