Typically, an image formed using the backprojection algorithm is the coherent sum of every pulse’s contribution to every image pixel, accounting for the respective time delays and phase corrections. This allows for highly accurate image reconstruction. The modification proposed, differs in that the contributions of every pulse are concatenated to form a 3D radar data cube, instead of being coherently summed. This approach allows for the precise analysis of how the phase of individual target pixels change over time. In this work, the phase is utilized to accurately reconstruct the amplitude and frequency of a vibrating target. This method is demonstrated on both simulated data and compensated phase history data (CPHD) acquired by Capella Space.
In recent years, radar jamming systems have become a crucial research area in the field of remote sensing for defence and security tasks. In a multistatic Synthetic Aperture Radar (SAR), the presence of false targets created by a deceptive jammer is recognizable thanks to the presence of multiple receivers, whose positions might not be easily known by the jammer. In this configuration the bistatic SAR geometry can be designed so that false targets are kept out observed bistatic scene. In this paper, we propose a mathematical analysis that expresses the jammer’s delay parameter as a function of the bistatic angle, identifying conditions to develop strategies to consistently induce the appearance of false targets in the bistatic scene and an analysis on how to place the false targets in the same position in the different bistatic images.
Across the world, many coastal tidal regions are unsafe to navigate due to shifting mud and sand pushed by water currents. Ability to regularly map the current location of a channel will aid safe passage for commercial, leisure and rescue craft. This work investigates the use of synthetic aperture radar data derived from satellites to provide accurate mapping of moving channels in coastal regions. As images must be collected at low tide, data availability is assessed considering the relationship between the orbital motion of the satellites and the tides. Change detection methods are applied to suitable images to map changes in the location of navigable channels. Pixels that undergo similar changes over time (e.g. from water covered to exposed sand) are grouped together by examining the principal component of the covariance matrix, for a vector composed of pixel values from the same location at different times. The Solway Firth in Great Britain is selected as a trial site as it is exposed to some of Europe’s fastest tidal movements and ranges, and hence is one of Great Britain’s most treacherous stretches of coastline.
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