Lanterman, A.D.; Munson, D.C., Jr.; Wu, Y., "Wide-angle radar imaging using time-frequency distributions," Radar, Sonar and Navigation, IEE Proceedings - , vol.150, no.4, pp.203-11,, 1 Aug. 2003. doi: 10.1049/ip-rsn:20030712
Abstract: Low-frequency radar systems provide some attractive advantages in a few niche applications, such as foliage penetration and covert operation. In low-frequency imaging systems, data must be collected over a wide range of angles to obtain cross-range resolution comparable to that obtainable from a competing small-angle high-frequency system. The reflectivity of a target varies with aspect angle; although this variation is usually ignored by traditional radar imaging algorithms, it sometimes cannot be neglected in wide-angle scenarios. To account for aspect dependence of reflectivity, time-frequency transforms have been invoked to generate a series of images corresponding to different look angles; these images may be considered individually or synthesised into a single image. A simple theoretical analysis with a point scatterer illustrates why the angular dependence needs explicit consideration. The potential of time-frequency methods is illustrated via simulations
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