Total rotational velocity estimation using 3D interferometrie ISAR with squint geometry

Recent works have shown 3D target reconstruction and total rotation velocity estimation to be feasible for interferometric inverse synthetic aperture radars (InISAR). In these techniques, it is often assumed that the target lies on an axis that is orthogonal to the group of receivers, an arrangement known as non-squint geometry. Such an assumption simplifies the resultant analysis and estimation algorithm, although it cannot be expected to hold for non-cooperative targets executing arbitrary manoeuvres. This paper extends the existing theory by considering squint geometry and examines its effects on the InISAR imaging performance. Simulations of total rotation vector estimation are carried out for a target located in different directions to the radar. We found that variations in the azimuth and elevation angles can enhance or degrade the estimation performance. Our contribution is a first step in a quantitative characterisation of the effects of squint geometry on 3D ISAR imaging.