Doppler-based motion compensation algorithm for focusing the signature of a rotorcraft

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[1] Goldman, Geoffrey H.
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Goldman, G.H. (geoffrey.h.goldman.civ@mail.mil) | 1600年 / Acoustical Society of America卷 / 133期
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A computationally efficient algorithm was developed and tested to compensate for the effects of motion on the acoustic signature of a rotorcraft. For target signatures with large spectral peaks that vary slowly in amplitude and have near constant frequency; the time-varying Doppler shift can be tracked and then removed from the data. The algorithm can be used to preprocess data for classification; tracking; and nulling algorithms. The algorithm was tested on rotorcraft data. The average instantaneous frequency of the first harmonic of a rotorcraft was tracked with a fixed-lag smoother. Then; state space estimates of the frequency were used to calculate a time warping that removed the effect of a time-varying Doppler shift from the data. The algorithm was evaluated by analyzing the increase in the amplitude of the harmonics in the spectrum of a rotorcraft. The results depended upon the frequency of the harmonics and the processing interval duration. Under good conditions; the results for the fundamental frequency of the target (∼11 Hz) almost achieved an estimated upper bound. The results for higher frequency harmonics had larger increases in the amplitude of the peaks; but significantly lower than the estimated upper bounds. © 2013 Crown;
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