On 18 January 2010, "Perth" docked at the Australian Marine Complex in Henderson, Western Australia to be modified under the Anti-Ship Missile Defence Project. The upgrade, intended to improve the class' anti-ship self-defence capability, included the fitting of CEA Technologies' CEAFAR and CEAMOUNT phased array radars, a Vampir NG Infrared Search and Track system, and Sharpeye Navigational Radar Systems, along with improvements to the operations room equipment and layout. Both of the frigate's masts were replaced; the top of the aft mast now sits at , making "Perth" the second-tallest ship in the RAN. Because of the added equipment, additional ballast was added to improve the frigate's stability, and the ship's quarterdeck was enclosed. The additional weight brought the ship's full load displacement to 3,810 tons. After the upgrade was completed in October 2010, "Perth" was used to trial the modifications before they were rolled out to the rest of the Australian "Anzac"s: alongside and harbour trials at were successfully completed in February 2011, and full sea trials began on 21 February. On 27 April, the frigate sailed to the east coast of Australia to continue trials, with further testing to occur at the United States Navy's Pacific Missile Range Facility, then during Exercise Talisman Sabre. Testing was completed by July 2011, and the rollout of the ASMD upgrade across the class was approved in November 2011.