Abstract
An approach to range-based imaging providing an enhanced “image bearing” component of signal intensity, and applicable to wide-band signals propagating through dilute, random, discrete-scatterer media is considered. The method is based on measuring the two-frequency mutual coherence function (MCF) of the signal and on a processing technique which suppresses diffusive contributions to the MCF and ensures a range resolution inversely proportional to the signal bandwidth.
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- 1.
In the following we are discussing mostly field intensities, which are adequate quantities when imaging is based on short pulses. The analysis can be extended to long-chirped signals, in which case it becomes more complex and has to be based on the MCFs.
- 2.
These positions are integrated over in computing the MCF.
- 3.
This qualitative description can be formalized in terms of the Dyson and Bethe–Salpeter equations for random media.
- 4.
The lack of positivity of the processed intensity does not violate any physical principles; neither does its lack of causality, although the latter could be achieved by using a causal filter.
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This work was sponsored by a grant from the Air Force Office of Scientific Research.
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Bleszynski, E.H., Bleszynski, M.K., Jaroszewicz, T. (2014). Amplification of Signal Intensity in Imaging Through Discrete Random Media Through Signal Interference Gating and the Use of Mutual Coherence Function. In: Sabath, F., Mokole, E. (eds) Ultra-Wideband, Short-Pulse Electromagnetics 10. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9500-0_8
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