Need help to generate spectrum for FM-CW radar (ADS)

Hi guys!

I need a bit of help to get the spectrum i want so that i can compare it to the results on a spectrum analyzer. Attached is the schematic and details that I want to set for simulation However I can seem to get the spectrum that I want. Can someone take a look and assist me in simulating this schematic?
PS I would like to know how to make a stationary target as well. Thank you!