Chirp modulation

I want to understand the concept of the Chirp modulation? any good books?

For example the period of the chirp depends on what?

Take a look here

http://www.nanotron.com/nanotron_int...er_nanoNET.pdf

hi
you can find complete discussion of this topic in
"Ultrasound Imaging Using Coded Signals" by:Thanassis Misaridis

this ebook is available in edaboard.
regard