Dual Frequency Synthetic Aperture Radar (SAR)

^{NASA ISRO synthetic aperture radar satellite (Source: NASA)}

SAR is also a key payload for Chandrayaan. While the IIRS will be looking for water, SAR will be trying to provide a quantitative estimate of exactly how much water is present in the Moon's polar region.

SAR will also be measuring the thickness of the Moon’s crust and its distribution. The crust maybe thicker is some places and thinner in others, that could help plan future missions and pin point where it may be easier to dig for further exploration.

In addition, SAR will be compiling a high resolution map of the Moon’s South Pole.