Direction Finding and Signal Characterization of Unknown Emitters

Under guidance of the NATO HQ C3 Staff and NATO Capability Panel 2 (CaP2) on Navigation and Identification, an experimental prototype of a GPS jammer direction finding and signal classification system was constructed using Software Defined Radio technology. The system is based on phased array processing of signals from a 6-element uniform linear antenna array, sampled with a multi-channel phase coherent Radio Frequency receiver. The prototype system was tested against realistic jammers and spoofers and demonstrated to have an accuracy of 2 degrees and a resolution around 10 degrees using the MUSIC algorithm. Signal classification features were proven to be very useful tools to support the operator in assessment of the jamming and spoofing situations. This report describes the design, implementation and extensive test results.