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Forest height retrieval is a major tool for estimating forest biomass, which plays a key role in global carbon studies. TomoSAR using multiple baselines to form an elevation synthetic aperture which has the capability to retrieve the structural information of the observed objects. However, its image quality is limited by the distribution and extent of the baselines. Compressive sensing provides super...
The versatility of a previously developed method for the synthesis of chiral carbene‐based palladacycles is demonstrated through the synthesis of two new chiral pyridine‐functionalized N‐heterocyclic carbene palladacycles with different wingtip groups. The efficiency in their resolution with different counter anions and different chiral amino acid salt auxiliaries has been studied. The absolute stereochemistries...
Circular SAR (CSAR) can obtain images of high resolution. However, the image quality is very sensible to sub-wavelength motion errors caused by platform position uncertainty. Due to the limit of accuracy of the inertial measurement units (IMU) systems, a robust autofocus technique has to be used to cope with the demands of CSAR image formation. Because of the serious coupling between range and azimuth,...
Near range microwave imaging techniques have broad application prospects in the field of concealed weapon detection, biomedical imaging, non-destructive testing, etc. In this paper, the 3D bistatic imaging geometry based on planar scanning aperture are proposed to be applied to near range microwave imaging, which can obtain the bistatic reflectivity of targets and consequently conduce to classify...
Geosynchronous circular SAR (GeoCSAR) is a novel system combined with GeoSAR and the Circular SAR (CSAR). The daily track of GeoCSAR is an inclined ellipse, while we divided the total aperture into several sub-apertures. Based on 2-D SAR image of sub-aperture we can observe the same place continuously. While the aperture is disturbed by perturbations and could not be approximated as a line. This paper...
Compressed sensing (CS) has been receiving a lot of interest because it provides possibilities to reconstruct signals or images from significantly fewer samples than Nyquist theorem acquire. In this paper, we apply this technique to circular SAR (CSAR). We demonstrate that CS has the potential to make two significant improvements to CSAR imaging: (i) reducing the number of samples to save memory and...
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