New Methods for the Detection and Interception of Frequency-Hopped Waveforms
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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Three new methods for the detection and interception of frequency - hopped waveforms are presented. First presented are two types of sequential detectors a purely sequential test that requires less data for a decision and a truncated sequential test that requires less data even while opeating under poor signal-to-noise ratios. Performances are evaluated via theoretical, numerical, and Monte Carlo analyses. Second, compressive-receiver-based-based interceptors are presented 1 a locally optimal detector, which is compared against the optimal channelized detectors 2 a simplified, suboptimal scheme, which trades off duty cycle against performance 3 and a technique for estimating hop frequency. Quantified are the performances of the optimal and suboptimal detectors. Third, a detector based on the Amplitude Distribution Function ADF is presented. Given is a technique for deconvolving the ADF, enabling signal and noise separation. From this, a detection statistic is defined and statistically characterized, yielding a new class of detectors. The detectors are performance analyzed. Keywords Spread spectrum, Frequency-hopped, Electronic counter measures, Interception, Probability, Detection, Statistics.
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