SAR Satellites

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SAR Satellites

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"To create a SAR image, successive pulses of radio waves are transmitted to "illuminate" a target scene, and the echo of each pulse is received and recorded. The pulses are transmitted and the echoes received using a single beam-forming antenna, with wavelengths of a meter down to several millimeters. "
36 satellites, to "photograph" every space on earth, every hour... First one launching Nov 19.

There are already quite a bunch of SAR Satellites, but likely pointed at areas of interest.. These ones will point to all areas eventually..

Some numbers and frequencies are given here:

360Watts, from 500km away.. sounds like it's not really strong at all.. but it will be interesting, as the most remote areas on earth will slowly get more and more satellite transmissions and there will not be any place left that is 'quiet'..