The invitation system was designed to be anonymous. If you would like to track users my suggestion would be to change the survey security to either "Access List" or "All Registered Users". This will allow you to limit access to the survey to only respondents with user accounts.
Additionally this change will enable the "Automatically Logs User In option in the invitation manager. When enabled this option automatically logs registered users in when they click on their personalized invitation id. Please note that this feature requires you to use Users as the source of the invitation.
If you are comfortable with SQL you could use the hidden item feature to capture the invitation id and use this to join responses to invitations.
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