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A beamforming approach to SAR image formation is shown to facilitate spatially variant aperture trimming which maximises the potential repeat-pass coherence when focusing onto undulating terrain. The method is demonstrated using the upgraded Australian airborne radar system, Ingara.
Coherent detection of changes on the ground under a forest canopy by repeat-pass synthetic aperture radar (SAR) imaging is problematic due to the mixture of ground and canopy responses. 3D SAR imaging, by beamforming data from multiple low-frequency across-track acquisitions, offers a way to separate the forest components in height. However, data acquired from multiple passes require precise registration...
The accurate imaging of terrain covered by forest is important for environmental and surveillance applications. This paper reports on techniques and results for the formation and analysis of SAR images from fully-polarimetric, low-frequency radar data collected over a tropical forest near Tully in Queensland, Australia.
Three-dimensional SAR tomography makes use of radar data acquired at different depression angles to synthesise an aperture in elevation and thereby undo layover and resolve along height. Focusing on one tomographic method appropriate to a spotlight-mode airborne collection system, the details of spatial bandwidth usage and point-spread function are described, and the phase modulation effects of the...
An upgrade programme to add a bistatic collection capability to the Ingara airborne X-band fully-polarimetric imaging radar has recently been completed, and the first field trials of the new bistatic SAR system were conducted in December 2007. This involved a set of experimental SAR data collections in a bistatic geometry, in which the airborne radar was operated in a fine-resolution (600 MHz bandwidth)...
New space-borne polarimetric SAR systems employ, or will employ, dual-pol imaging modes as well as full quad-pol imaging, e.g. PALSAR, RADARSAT-2, TERRASAR-X. Therefore questions arise as to the capabilities (and limitations) of these various dual-pol SAR imaging modes. One novel offshoot of our work on dual-pol SAR image analysis and polarimetric decompositions of dual-pol data was the idea to collect...
The accuracy with which distributed-target polarimetric calibration algorithms estimate crosstalk and the ratio of Tx-to-Rx channel imbalance is compared. The algorithms investigated are minor variants of previously-published algorithms but rederived for notational and definitional consistency. Numerical simulations were used to assess the algorithms' performance in the absence of noise. Results indicate...
In the past decade the use of fully polarimetric SAR (polSAR) systems has increased significantly due to their effectiveness in target classification and detection applications. While polSAR imagery has been extensively used to distinguish between different scattering mechanisms in a scene, there has been a lack of research in the exploitation of polarimetry to assist in image formation and in particular...
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