Enhanced Detection of Orthogonal Radar Waveforms Using Time-Frequency and Bi-Frequency Signal Processing Techniques
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This thesis investigates the periodic autocorrelation function PACF and periodic ambiguity function PAF for orthogonal continuous waveform CW modulations used in netted low probability of intercept LPI radar. Three orthogonal polyphase sequences and one frequency coding sequence are examined and their PACF and PAF characteristics are quantified. The Wigner-Ville distribution WVD and quadrature mirror filter bank QMFB time-frequency signal processing techniques and the cyclostationary bi-frequency technique often used in non-cooperative intercept receivers are used to detect the orthogonal CW signals and extract their parameters. The results shows that a combination of the techniques used were able to extract the basic signal parameters of bandwidth and code period from the polyphase waveforms and also the frequency hop slots and code length from the frequency coding sequence. The concept of using a swarm of unmanned aerial vehicles UAV is examined from the viewpoint of a coordinated group of netted intercept receivers in search of an LPI radar network.
- Computer Systems
- Active and Passive Radar Detection and Equipment