MIR is a dual-band airborne GNSS Reflectometer with two electronically steerable arrays (~19 dB), one up-looking for the direct signal (RHCP) and one down-looking for the reflected signal (LHCP). Each array has 4 steerable beams, 2 in GPS L1/Galileo E1 band, and 2 in GPS L5/Galileo E5a band. The instrument dynamically compensates the attitude of the plane to track the chosen satellites. The signals are sampled at 1bit and 32 MSPS with Software Defined Radios. The system is calibrated using 50 MHz locally generated PRN codes. First flight campaign was carried on in Australia from May 2018 to June 2018.