The use of multiple radar configurations can overcome some of the geometrical limitations that exist when obtaining radar images of a target using inverse synthetic aperture radar (ISAR) techniques. It is shown here how a particular bistatic configuration can produce three view angles and three ISAR images simultaneously. A new ISAR signal model is proposed and the applicability of employing existing monostatic ISAR techniques to bistatic configurations is analytically demonstrated. An analysis of the distortion introduced by the bistatic geometry to the ISAR image point spread function (PSF) is then carried out and the limits of the applicability of ISAR techniques (without the introduction of additional signal processing) are found and discussed. Simulations and proof of concept experimental data are also provided that support the theory

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The ability of interferometric SAR (InSAR) to provide terrain height estimation can be interpreted as being due to the baseline (of the two SAR imaging flight paths) acting as an aperture in the normal-to-slant-range (6) direction. However, the aperture, because it consists of only two nodes, has effectively no resolving power. In this paper we introduce and examine a technique which synthesises an N > 2 node aperture in the 6 direction from N -1 connected baselines. This, together with the slant-range and azimuth resolving capability of SAR imaging systems, enables the generation of high resolution 3-D imagery. A theoretical analysis and procedural outline of the proposed technique are presented.

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