The announcement was made last week at the Australia-Tonga Defence Cooperation talks in Nuku'alofa.
Australia's High Commissioner to Tonga, Thomas Roth, told Radio Australia's Pacific Beat the projects are a continuation of the defence cooperation agreement Australia and Tonga have had since the late 1970's.
"These talks reflect the progress and the maturity of the relationship, which we have across a range of defence issues and that's why they've been so successful last week," Mr Roth said.
Australia announced it will continue to work closely with the Tonga Defence Services, helping to improve its communications and information technology capabilities, and to expand the TDS's simulated weapons training facilities.
They will also engage in the Australian-led Exercise Longreach in November, involving humanitarian assistance and disaster relief planning activities.
The agreement comes on top of a US-led disaster preparedness exercise in Tonga last week, called 'Coral Reef.'
Mr Roth also highlighted Tonga's contribution to the International Security Assistance Force (ISAF) mission in Afghanistan and with the RAMSI mission in Solomon Islands.
He says about 55 Tongan troops are deployed in Afghanistan as base security at Camp Bastion in southern Helmud province.
"The reports that we've got back from our British counterparts and colleagues have been that the Tongans have performed very well and that's why they've been asked to stay on...through to 2014."