The 24-year-old has recently returned from a month`s loan with League Two side Colchester United, having joined Pompey in January 2017 from Hampton & Richmond Borough.
He scored 40 goals in eighty games for The Beavers, as they won promotion to National League South, and previously also played for Hayes & Yeading United, Uxbridge, Hayes, Burnham and Hemel Hempstead Town.
Shots manager Gary Waddock told press officer Steve Gibbs: “I’ve monitored Nicke for quick some time and I’m extremely pleased that we’ve been able to get him on board.
“When we played against Hampton in a pre-season friendly he was an absolute handful. He got himself a good move to Portsmouth, and has played in the Football League – he’s a very good player and gives us competition up front.
“He’s quick, strong, powerful and good in the air, and he gives us a different option to the strikers that we currently have at the Club. We wanted to bring another centre-forward in, and goals win games.”
This deal is the second to be funded by the new `500 Club` initiative, which invites supporters to contribute to Waddock's playing budget with a 'money-back-and-more' guarantee if Aldershot win promotion to the Football League this season.
Kabamba is available as The Shots face Dover Athletic tomorrow.