Electronic Weapons: Blinded By The Laser Light

Archives

January 14, 2009: The U.S. Marine Corps has decided to equip its CH-53D and CH-46E helicopters with DIRCM (Directional Infrared Countermeasures.) Equipping helicopters with defenses against shoulder fired surface-to-air missiles (like the SAM-7 or Stinger) is shifting from systems that use flares, to those that use laser beams.

A typical system has two components. First, there are four ultraviolet detection sensors (weighing about four pounds each) mounted on different parts of the helicopter to detect an approaching missile. These sensor are linked to an 6-12 pound computer that contains software for determining that the object is indeed a missile and where it is headed. The detection computer is hooked to a countermeasures system using either flares and chaff (strips of metal foil), or a laser, to confuse the missiles guidance system (that is homing in the heat of the helicopters engines.) The countermeasures component weighs 30-50 pounds, depending on type or model. 

For over a decade there was is a debate going on in the military over whether to equip helicopters with the army developed ATIRCM/CMWS (Advanced Threat Infrared Countermeasures/Common Missile Warning System), that uses flares and chaff, or a system (DIRCM), that uses a laser to confuse the missiles guidance system. The DIRCM originally cost about 40 percent more than the ATIRCM/CMWS (which costs two million dollars per aircraft). But the cost difference has been shrinking. The ATIRCM/CMWS uses a proven technology, while the DIRCM's laser has slowly been gaining experience under combat conditions. The army initially equipped some of its Special Forces helicopters with DIRCM, and now there's a lot of momentum behind only using DIRCM in the future. So far, fewer than twenty American helicopters have been hit by missiles in Iraq and Afghanistan, and many more attempts have been foiled by missile countermeasures.

 


Article Archive

Electronic Weapons: Current 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 


X

ad
0
20

Help Keep Us Soaring

We need your help! Our subscription base has slowly been dwindling. We need your help in reversing that trend. We would like to add 20 new subscribers this month.

Each month we count on your subscriptions or contributions. You can support us in the following ways:

  1. Make sure you spread the word about us. Two ways to do that are to like us on Facebook and follow us on Twitter.
  2. Subscribe to our daily newsletter. We’ll send the news to your email box, and you don’t have to come to the site unless you want to read columns or see photos.
  3. You can contribute to the health of StrategyPage. A contribution is not a donation that you can deduct at tax time, but a form of crowdfunding. We store none of your information when you contribute..
Subscribe   Contribute   Close