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Three dimensional (3D) images can be obtained with SAR moving in a circular trajectory (circular SAR, CSAR) using confocal 3D imaging algorithm (CIA). However, the image formation is very time-consuming due to the 3-D space variant filtering contained in the algorithm. This paper transformed the 3D space variant filtering into a 2D filtering followed by a time shift in the height direction based on...
MB-TomoSAR (multi-baseline SAR tomography) is the most promising technique to realize the real 3-D (three-dimensional) resolution of the observed target zones in future. In this paper, the state art of MB-TomoSAR is briefly reviewed firstly. Secondly, a more general MB-TomoSAR model is described, and a novel imaging approach of processing MB-TomoSAR data is proposed base on this general model. Thirdly,...
The bistatic configuration of linear array with one central antenna element for transmitting and the other antenna elements of linear array for receiving is introduced in downward-looking SAR for three-dimensional imaging in this paper. The geometrical model and the received signal model of downward-looking SAR using bistatic uniform linear array antennas are established. The analytic expression of...
Polarimetric SAR interferometry (Pol-InSAR) combines SAR interferometry (InSAR) and SAR polarimetry (PolSAR), and it helps to the generation of digital elevation models (DEMs) as well as the parameter estimation of natural volume scatters. Baseline is an important concept in conventional InSAR applications. With the introduction of polarization into InSAR, the baseline requirements of Pol-InSAR are...
In this paper, the CSAR (circular synthetic aperture radar) technique is introduced firstly. The principle of CSAR 3D (three dimensional) imaging and the spatial wavenumber support are analyzed and the 3D resolution is discussed secondly. Secondly, Ku band fully-polarimetric CSAR human body imaging experiments are performed, and the experimental data is processed by a fast 3D backprojection algorithm,...
Based on dual frequencies-dual apertures spaceborne SAR (synthetic aperture radar), a new SAR operation mode with four receiving channels is presented in this paper. High resolution imaging and moving target indication (MTI) are studied with this new mode. The coherent accumulation (CA) method, which combines dual channels data, is used to enhance the range resolution. With the data from all channels,...
According to the characteristic that the bandwidth of spaceborne SAR is generally quite wide, a new method called "sub-band double carrier frequency conjugated processing" is presented in this paper. The approach can decrease the equivalent central frequency of the synthetic signal and remove the Doppler ambiguity. Consequently, Keystone transform can be used to correct the linear range...
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