KEYWORDS: Sensors, Signal detection, Doppler effect, Receivers, Signal processing, Target detection, Signal to noise ratio, Radar, Signal attenuation, Content addressable memory
The interception of low probability of intercept signals has become increasingly difficult due to the availability
of waveform agile transmitters and increased spectral bandwidth. Current detection techniques based on energy
detection ignore the important cross-sensor correlation information. Additionally, existing TDOA/FDOA based
localization techniques pair up the sensors and perform only pair-wise processing which is highly inefficient.
To circumvent this problem we show how to use multiple spatially distributed sensors to detect and localize
an emitter whose waveform is completely unknown. We present the generalized likelihood ratio detector which
optimally combines the multiple sensor information for improved detection. Additionally, as part of the detector
the MLE for target location is available, leading to improved localization.
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