Generating gaussian pulse

hi everyone,

I have a project which is about implementing a distance measurement
equipment on gnuradi-USRP. I am a newbie, i don’t know from where to
begin exactly. The system transmits a pair of gaussian pulses modulated
in AM. So i want to know how to create this analog pulses in gnuradio. I
have looked to some tutorial for modulation but my problem is the
gaussian pulses. Also I know that gnuradio deals with digital data so i
am really blocked.
There is a picture of the pulses that i want to generate.
I will be so grateful for your help.

Thank you