Problem
Your colleague proposes putting a W-band radar (100 GHz) with a 30 dB gain on a CubeSat to look at satellites with a 1 square meter RCS at a range of 100 km. 0.1 mW of power is required to have a sufficient SNR to detect the satellites. Assume space is a lossless environment. How much peak (Pt) power will be required to execute this? Is this proposal realistic? Why or why not?