The Canadian Federal Government has signed a $55.7m contract to modernise two military radar systems in a move to upgrade its air force.

Canadian Defence Minister Peter MacKay said the upgraded portable tactical radar systems would play a key role in defending North American airspace.

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The radars will replace aging systems and provide long-range air surveillance and aerospace control capability in support of military operations worldwide.

Delivery of the upgraded radars will begin in February 2013.