Last month, as part of operation Northern Edge, the U.S. military set up some GPS jamming equipment in Alaska, in order to test the efficacy of some new anti-jamming equipment. The motivation for such a test is, of course, is that militants and others can easily jam or interfere with such weak signals, therby rendering GPS equipment inoperative.

Last month, Phrack magazine published a detailed guide to building a low-cost, portable GPS jammer out of components that can be easily obtained from electronics supply houses.

Not that you would ever want one for your car, but Raytheon has developed a family of low-cost anti-jam adaptive antenna systems to protect receivers from simultaneous, multiple jamming sources.

The Raytheon Pagan anti-jam devices represent an interesting use of beamforming. The receiver identifies each interfering source, and forms a null beam towards the source, effectively ignoring it.

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