The sixth of eight ANZAC-class frigates of the Royal Australian Navy has been undocked by BAE Systems Australia after major modernization work.

The upgrades were to the combat management system of HMAS Parramatta, with the addition of a new infrared search-and-track system, and a new dual navigation radar.

A number of other significant engineering and structural changes unique to the vessel were also performed, including enclosing the quarter deck, galley refurbishment and modifications to accommodate combat helicopters.

BAE Systems Australia said that in the modernization process, much of the frigate's equipment and operating systems were removed and then rebuilt.

"The work we're doing at Henderson demonstrates the quality of our engineering, program management and builds on the flexibility of Australian industry capability that is only possible with an experienced Australian maritime defense provider," said BAE Systems Australia CEO Glynn Phillips. "Our highly skilled workforce is at the core of our capability, ensuring that the project achieves the quality, cost and schedule milestones despite the enormous complexity of such work.

"Our team, together with our ANZAC Alliance partners, is very proud to support the Royal Australian Navy and its efforts by successfully implementing a world leading defense capability."

A seventh ANZAC-Class frigate is currently being upgraded. Work on an eighth and last ship is to begin next month.

HMAS Parramatta will now begin the test and trials phase of the modernization project.

The upgrade project is being undertaken through the Anzac Ship Integrated Material Support Program Alliance, which is comprised of BAE Systems, Saab Systems and the Defense Department's Capability and Sustainment Acquisition Group.