Space: July 30, 2003


Before the Iraq war, many pundits predicted that the Iraqis could easily jam American GPS guided bombs. The Iraqis tried, and their six jammers were quickly taken out, one them via a GPS bomb. Aside from the fact that U.S. JDAM GPS bombs have a (less accurate)  backup inertial guidance system, it was often overlooked that GPS was designed to be jam-proof. The Department of Defense won't discuss anti-jamming technology in detail, for obvious reasons. But it is known that jam-resistant antennas and variable power levels from the GPS satellites has been used. A future enhancement will involve digital signal processing and beam steering (looking for the real signal from where the satellites is, not where the jamming is coming from) to suppress jamming signals. Also, the next generation of U.S. manufactured GPS receivers (stand-alone and built into weapons and equipment) must include a GPS Selective Availability Anti-Spoofing Module (Saasm), and other anti-jamming technology that is not discussed much. It will always be possible, in theory, to jam the GPS signal. But by constantly adding and updating anti-jamming technology to military GPS receivers, such jamming remains difficult and, for most nations, nearly impossible. 


Article Archive

Space: Current 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 



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