hi,
you can user the tools provided with JustDvb-It
this is an open source carousel server (DSMCC) but it acts also as a PSI table generator.
you can get it here, just put your email at the end of the page (sorry just italian)
http://www.cineca.tv/labs/mhplab/index.html
to register for the protected area (a mail will come to your box with the credentials)
then get the JustDvb-It package and read the few instructions.
to make a long story short, you need to modify the psi-config.py script where there are all the PSI table defined (accordingly to your needs..)
the run it ./psi-config.py and get the ait.ts file. it's the AIT binary representation you are after..
HTH
andrea venturi