Broadband circular interferometric millimetre-wave ISAR for threat detection

[摘要] To detect threats on a person's body surface the application ofmillimetre-waves is possible. In order to get a view of the person from allsides either the person has to be rotated standing on a turntable (InverseSynthetic Aperture Radar, ISAR) ora sensor is moved on a circular patharound the person (Synthetic Aperture Radar, SAR).The goal of the reconstruction is to obtain information about the shape ofthe threats and their positions in all three dimensions.At first the reconstruction is done along range and azimuth, which span theprincipal surface given by the sensor configuration.This paper reports on two methods to obtain the third spatial dimension.Due to the circular shape and its 3D focussing ability of the aperture thisinformation can be obtained by the evaluation of the image focus.Secondly, if two coherent receiving channels are used, a possibility toachieve 3D spatial resolution is the processing of the interferometricphase. A comparison between these two will be presented.

[学科分类] 电子、光学、磁材料