Kitson, who will be 35-years old on the 9th January will train the clubs strikers one day a week and will also register as a player with the League Two club to provide emergancy cover.
Kitson joins the Nene Park club for a second time, having previously played 30 games for them in the 2003/04 season, scoring 5 goals.
Kitson only made one substitute appearance for the Shots back in August but remained on the clubs books.