Journal ArticleDOI
Range-Doppler Imaging of Rotating Objects
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TLDR
In this article, the effects of various system aberrations are investigated and experimental results from a microwave test range which demonstrate the image improvement are presented, along with an analysis of the three-dimensional radar/object geometry with separate source and receiver locations.Abstract:
During the integration time required to obtain fine Dopplerfrequency resolution in a range-Doppler imaging radar, a point on a rotating object may move through several range and Doppler resolution cells and produce a smeared image. This motion can be compensated by storing the appropriately processed return pulse, and the angular coordinates are determined by the angular coordinates of the radar antenna. The resulting stored data represents the three-dimensional Fourier transform of the object reflectivity density, and hence can be processed by an inverse Fourier transformation. Also included is an analysis of the three-dimensional radar/object geometry with separate source and receiver locations. The effects of various system aberrations are investigated and experimental results from a microwave test range which demonstrate the image improvement are presented.read more
Citations
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Journal ArticleDOI
Synthetic aperture radar interferometry
Richard Bamler,Philipp Hartl +1 more
TL;DR: In this article, a review of the technology and signal theoretical aspects of InSAR is presented, where the phase differences of at least two complex-valued SAR images acquired from different orbit positions and/or at different times are exploited to measure several geophysical quantities, such as topography, deformations, glacier flows, ocean currents, vegetation properties, etc.
Journal ArticleDOI
Three-dimensional millimeter-wave imaging for concealed weapon detection
TL;DR: In this paper, a widebandwidth three-dimensional holographic microwave imaging technique is described for the detection of concealed weapons or other contraband carried on personnel since millimeter-waves are nonionizing, readily penetrate common clothing material, and are reflected from the human body and any concealed items.
Journal ArticleDOI
Developments in Radar Imaging
TL;DR: A review of the range-Doppler technique is presented along with a description of radar imaging forms including details of data acquisition and processing techniques.
Journal ArticleDOI
A tomographic formulation of spotlight-mode synthetic aperture radar
TL;DR: In this article, a projection-slice theorem from computer-aided tomograpy (CAT) is used to analyze the signal recorded at each SAR transmission point, which is modeled as a portion of the Fourier transform of a central projection of the imaged ground area.
Journal ArticleDOI
SAR imaging of moving targets
TL;DR: A method of forming synthetic aperture radar images of moving targets without using any specific knowledge of the target motion is presented, using a unique processing kernel that involves a one-dimensional interpolation of the deramped phase history which is called keystone formatting.
References
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Journal ArticleDOI
Synthetic Aperture Radar
TL;DR: In this paper, a simple circuit-theory model is developed; the geometry of the system determines the nature of the prefilter and the receiver (or processor) is the postfilter.
Journal ArticleDOI
The Axicon: A New Type of Optical Element
TL;DR: The axicon autocollimator as discussed by the authors is a projector which projects a straight line of images into space, and it can be used to determine the perpendicularity of a mirror.
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The theory and design of chirp radars
TL;DR: This paper contains many of the important analytical methods required for the design of a Chirp radar system, and a method to reduce the time side lobes by weighting the pulse energy spectrum is explained in terms of paired echoes.
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On the application of coherent optical processing techniques to synthetic-aperture radar
TL;DR: The form of the returning radar signals is discussed, as are the general reasons why optical processing of these signals might be attractive, and the role of a conical lens in simplifying reference-function realization is discussed.
Journal ArticleDOI
An introduction to synthetic-aperture radar
TL;DR: The key to converting the theoretical groundwork into a ``full-bodied'' system is an appropriate data-processing scheme, and the simplest scheme for working, processing, and deciphering the data is optical.