RADAR data sets are archived by the PDS (Imaging Node) at the Jet Propulsion Laboratory and USGS - Flagstaff.
User's Guide is 
on line at the imaging node
Raw Data Products
Basic Image Data Records (BIDRs)
  
Short Burst Data Records (SBDRs)
  
Long Burst Data Records (LBDRs)   
Online Access     PDS Search by keyword
Access via ISIS  - The ISIS 3 software package can be used to process data Imaging Science Subsystem (ISS), Visual and Infrared Mapping Spectrometer (VIMS) and RADAR. You will find 
step-by-step instructions for cartographic and science data to create your own products. 
A 
Guide to the Planetary Atlas that introduces search options and a tutorial on review and retrieval of Cassini data  can be found at the Imaging Node.
Higher Order products - 
Under Development
A Titan global shape model.  See 
https://astrogeology.usgs.gov/search/map/titan_cassini_gtdr_data 
Radiometer Maps. The data are from pole-to-pole scans and are tabulated in time ordered tables of point-by-point of brightness temperature and other parameters. Residual maps interpolated on a regular grid in cylindrical coordinate are included.
See table of 
radar observations (
xlsx, 
txt) 
See the 
Master Schedule for a time ordered listing of observations by all instruments.
Imaging node Aid
 SPICE - Archived Cassini SPICE ancillary data providing observation geometry (positions, orientations,
 instrument pointing, time conversions and the like) are available from the PDS 
NAIF Node.
Publications - A listing of team members to facilitate literature searches.