network analyzer port software?

if I had a two port network analyzer, like an 8720 or 8722, but needed to measure a 3 port circulator...is there any software available to compute the 3 port S parameters from multiple 2 port measurements? I am particularly interested in if a full 3 port TRL cal can be "simulated" with the software.

Thanks

If you can get the data points into Excel, you could just calculate them.

There are quite a few papers about doing all of that:

https://www.google.com/#bav=on.2,or....r&sa=N&start=0

You are a master of google fu indeed. I found almost nothing. thanks