Interferometric inverse synthetic aperture radar experiment using an interferometric linear frequency modulated continuous wave millimetre-wave radar

Abstract

An interferometric linear frequency modulated continuous wave (LFMCW) millimetre-wave radar is presented, along with the results of an experiment conducted to srudy the feasibility of using it in a ñirure millimetre-wave interferometric inverse synthetic aperture radar (InISAR) system. First, a description of the radar is given. Then, the signal processing chain is described, with special attention to the phase unwrapping technique. The interferometric phase is obtained by unwrapping the prominent target's phase in each antenna using a sliding frame processing technique. Cell migration issues in this method are also addressed. Simulations were carried out to illustrate and assess the processing chain and to show the effects of multipath echoes on the height measurement. In the real experiment, the range, speed and height of a moving target were tracked over consecutive inverse synthetic aperture radar (ISAR) image frames, verifying the performance of the whole system.

Interferometric Isar Imaging on Maritime Target Applications: Simulation of Realistic Targets and Dynamics

“…In addition, we assume the radar has an additional transmitting antenna located at O. This geometry corresponds to the bi-static radar presented in [12]. For that kind of radar configuration, the interferometric height is obtained using the interferometric phase, which depends on the distance difference from the target to the lower receiving antenna r L and with the upper receiving antenna r U , as shown in (11).…”

“…The absolute phase difference can be obtained by phase unwrapping [25,26]. However traditional phase unwrapping algorithms that assume a continous phase surface are not directly applicable to InISAR images [12]. Another option is to use an unambiguous extra interferometric pair for the distance of interest, [11,27], in order to obtain the correct phase cycle n(r, d) in (14).…”

“…Interferometric ISAR (InISAR) employs more than one phase centre in the radar instrument to reconstruct a 3-D target [11][12][13]. Typically, two vertically displaced receivers are used to retrieve the height information from the phase difference of a pair of ISAR images.…”

The Interferometry Phase of Insar Coherent Jamming With Arbitrary Waveform Modulation

“…Also, its basic function of twodimensional imaging has been extended to include many branches of SAR family, e.g., Polarimetric SAR (PolSAR) [5], multiband SAR [6], bistatic SAR [7,8], Multi-Input Multi-Output SAR (MIMO SAR) [9], and Interferometry SAR (InSAR). Although InSAR has been developed since long time ago and widely used in many areas [10][11][12], its performance in a hostile electromagnetic environment has not yet been thoroughly studied. In real world, there exist many kinds of (intentional and/or not) jammings or interferences [13,14], e.g., a civic TV transmitter, a radio station, or even a military jammer.…”

POLARIMETRIC SAR TOMOGRAPHY USING <I>l</I>_2,1 MIXED NORM SPARSE RECONSTRUCTION METHOD

“…However, it can not resolve multiple scatterers lying in single pixel. In addition, the interferometric quality will be seriously deteriorated by volume scattering effect, and the phase unwrapping techniques may not work for man made structures [11]. Polarimetric interferometric theory and the model based polarimetric coherence tomography (PCT) technique have demonstrated their discrimination ability for scatterers of different scattering mechanism in the vegetation structure inversion application [12].…”