Sisir Radar presents unmatched resolution P band SAR mosaic captured over multiple flights

Sisir Radar presents a time series of a mosaic of five P-band SAR images over the same terrain, captured by our Drone SAR spanning over almost a fortnight in this month. You can easily appreciate the radiometric and geometric fidelity of our P-band SAR images. SAR specialists can go through the images with a fine comb. After all, this is the first time anybody is seeing P band SAR images at this fine resolution of 2.5 m, that too with hybrid polarimetry.

One may ask what is the big deal in getting 2.5 m resolution in P-band? Let us compare P, L, and X band aperture lengths at a slant range of 2 km. You will be surprised that the SAR aperture lengths are 240 m, 95 m, and 12 m, respectively in P, L and X bands. When translated into aperture time for our drone, flying at typically 8 m per second, the aperture time translates to 30, 12,1.5 seconds respectively. If you consider turbulent weather in the Eastern part of India in this part of the season, the drone just flies like a toy floating on the sea! The challenge in motion compensation and processing goes up with the square of aperture time. Now you can realise processing SAR data in P-band is computationally complex by almost an order of two than processing X-band !!

Our colleagues in Sisir Radar deserve congratulations for achieving this feat, not just once in a while, but unfailingly with every flight at any time of day and night.