But the arrangement will be a lease rather than a purchase.
"The Giraffe Agile Multi Beam radar is one key component of Defence's Counter Rocket Artillery and Mortar (C-RAM) capability," Senator Faulkner said.
"This lease contract will enable the most efficient and rapid delivery of the Giraffe radar system for operational use by Australian Defence Force personnel currently deployed in Afghanistan.
"The Giraffe radar is a most capable system.
"It provides early detection of attacks from enemy rockets, artillery and mortars.
"When this radar is networked with other equipment that we are procuring under the C-RAM project, friendly forces will benefit from the early warning against such attacks, improving force protection," Senator Faulkner said.
The lease contract value is approximately $32 million and includes a full logistic support package.
The lease is an interim measure while the DMO advances the acquisition of additional radar systems for progressive introduction into service.