Q 5.2 Can a radar be mounted on a satellite?

Radar payload has been used since 1980s on various space missions for probing the Earth and other planets. The advantage of a Radar payload is its ability to remain unaffected by cloud cover over the surface of the Earth or other planets when used on planetary mission including its ability to probe below the target surface.
The uses of space radar payload include Earth resource survey, probing of planets, defence missions to track movement of aircrafts, land vehicles and ships, docking with other space vehicles and landing on planets and moon. Synthetic Aperture Radar (SAR is used for imaging applications. Sounding radars are used for below surface probing by using frequencies that penetrate the surface of the target.

Please refer to the vast literature on the subject for details.