Vision Systems International (VSI) has received a contract from Lockheed Martin for two additional development phases for the helmet-mounted display system (HMDS) on the F-35 Lightning II joint strike fighter aircraft.

VSI president Drew Brugal said the enhanced fifth-generation HMDS capabilities form an integral component of the F-35 programme.

The HMDS will be equipped with new digital night-vision sensors to enhance night-vision capability and to allow the pilot to view sharper images at very low light levels.

The company recently modified and tested the HMDS current magnetic receiver unit (MRU) to enable the pilot to detect seat and aircraft vibration frequencies.

Deliveries will begin in the third quarter of 2013.