27 July 1999 Fast M-sequence transform for laser-Doppler-based mine detection
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Abstract
Low detector signals, acoustic coupling and speckle noise are challenging problems in the laser Doppler-based acoustic-to-seismic detection of land mines. Scanning insonified patches over buried targets with the spatial resolution required in minefield applications demands processing a large quantity of detection data. To achieve an efficient and robust detection, acoustic-to-seismic coupling on the ground is considered as a system under test (SUT), number-theoretical maximum-length sequences (M-sequences) have been applied as the acoustic excitation to the SUT. Exploiting their excellent auto-correlation property and high noise immunity due to high signal energy and noise suppression, a fast algorithm (so-called fast M-sequence transform) is implemented in the cross-correlation procedure to extract the impulse response of the SUT directly from laser Doppler vibrometer signals with a high signal-to-noise ratio. The advantage of directly obtaining impulse responses is also exploited in featuring a time windowing technique to isolate the acoustic coupling into the laser Doppler-based system.
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Ning Xiang, Ning Xiang, James M. Sabatier, James M. Sabatier, } "Fast M-sequence transform for laser-Doppler-based mine detection", Proc. SPIE 3720, Signal Processing, Sensor Fusion, and Target Recognition VIII, (27 July 1999); doi: 10.1117/12.357179; https://doi.org/10.1117/12.357179
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