In practice, none of it matter in this case. The leakage of rectangular window is ~30dB at a distance of 30 bins, and they aggregate more than 30 adjacent bins together ("re-bin"), making the leakage no more than 1 bin. To make things worse, the dynamic range of their receiver barely scrapes 40dB (peak) or 30dB (SFDR/SINR) - rendering the use of a more sophisticated window a moot point.
In practice, none of it matter in this case. The leakage of rectangular window is ~30dB at a distance of 30 bins, and they aggregate more than 30 adjacent bins together ("re-bin"), making the leakage no more than 1 bin. To make things worse, the dynamic range of their receiver barely scrapes 40dB (peak) or 30dB (SFDR/SINR) - rendering the use of a more sophisticated window a moot point.