The Philippine Navy is looking to acquire missile frigates, anti-submarine helicopters and artillery pieces as it continues to boost its defense capabilities.

Local news reports, quoting the Navy's chief of naval staff for logistics, Capt. Alberto Carlos, said the contract bidding process is now taking place for two new frigates and helicopters and "we are looking at signing the contract by early next year."

More than $404.6 million has been allocated for the ship acquisition.

The Philippine Navy expects the ships and the helicopters would be delivered within three or four years after contract signing.

The Navy is also eyeing the purchase of six 155-millimeter howitzers to improve the fire support and attack capability of its Marine units, according to the official Philippine News Agency.

"The project will be an additional capability for the Marines especially in the conduct of fire support for its operating forces," Navy vice commander Rear Admiral Caesar Taccad said.

"The artillery system (will be) equipped with fire control computers, muzzle velocity radars, inertial navigation and target acquisition systems. It (will) provide the most responsive and accurate fire support to maneuver infantry battalions with maximum lethal effect and larger target range."

News of the intended acquisitions coincide with an $18 million order to Harris Corporation, based in in the United States, for vehicular tactical radios and intercom systems for the Philippine military's armored forces.

The intent also coincides with continued tensions between the Philippines and China over ownership of islands in the South China Sea.

In other Philippine developments, the country's military forces have been placed on alert to guard against possible hostile actions by the New People's Army, a communist insurgent group founded 46 years ago on Dec. 26.