Iran has successfully tested a radar-evading aircraft, a commander said on Sunday, in the country's latest announcement of technological advances.

The semi-official Fars News Agency, citing senior air force official Aziz Nasirzadeh, said the prototype of a radar-evading aircraft named Swordfish had been test-flown.

"The prototype of this aircraft ... completed all radar evading characteristics considered by us," he said. "We are evaluating the data from the test flight and it will go into production after completing additional tests."    

Meanwhile, Iran will start producing 20 percent enriched nuclear fuel from Tuesday, the head of its Atomic Energy Organisation was quoted as saying.

"We will hand over an official letter to the IAEA (International Atomic Energy Agency) tomorrow, informing the agency that we will start making 20 percent enriched fuel from Tuesday," Ali Akbar Salehi told Iran's Arabic-language state television channel, Al Alam.

Iran is embroiled in a dispute with the West over its nuclear programme and often makes announcements of progress in its military capabilities, in an apparent attempt to show its readiness to respond to any military attack.

On Saturday, it officially started production of two new missiles, state media said, three days after it launched a rocket which can carry a satellite.   

During the Feb 1-11 period, Iran marks the 31st anniversary of the Islamic revolution that toppled the US-backed shah.