A nice note for introduction for remote sensing

The complete title is

RF/Microwave system analysis
For wideband radar/ remote sensing

Doesn't look an introduction to me.

It is an introduction for people who already know how to design microwave communications systems. It is not for basic beginners in microwave technology.

Hi
when i tried to download this file, it required me to enter a user name and password ! can't i download it for free ( free mirror ) or i must down with points ?
Thanks