Proceedings ArticleDOI
Algorithm of Formation Radio Images from Aerospace Carriers
Vladimir Pavlikov,Valeriy Volosyuk,Mykola Nechyporuk,Anton Sobkolov,O. V. Odokienko,Eduard Tserne +5 more
TLDR
Inverse filters are proposed to improve image quality and the influence of errors in calculating the ambiguity functions on the quality of image filtering is estimated.Abstract:
An algorithm has been synthesized for processing ultra-wideband spatio-temporal signals providing the formation of radio images from aircraft. A feature of the algorithm is the implementation of the active-passive mode of operation of the radar, which provides for the emission of an ultra-wideband signal and the processing of reflected signals by methods of passive multi-channel radar with external coherence. This allows to take pictures in the field of view in the direction of ±20° from the nadir. The algorithm generates a radio image of high spatial resolution through the accumulation of the signal during the movement of the aircraft, the use of several spatially separated antennas and a wide frequency band of received signals. A structural diagram of the radar is developed and its operation is simulated. Radar ambiguity functions investigated. Based on them, inverse filters are proposed to improve image quality and the influence of errors in calculating the ambiguity functions on the quality of image filtering is estimated.read more
Citations
More filters
Proceedings ArticleDOI
Development of Broadband Criterion for Spatially Distributed Radio Systems Synthesis
Volodymyr Pavlikov,Valeriy Volosyuk,S. S. Zhyla,Eduard Tserne,Olexandr Shmatko,Anton Sobkolov +5 more
TL;DR: In this article, a new criterion for the broadband radars with spatially distributed antenna systems is proposed, taking into account the specificities of the antenna system geometry and the operating frequency range of the radar.
References
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Journal ArticleDOI
Tutorial: Passive radar tutorial
TL;DR: This tutorial shall give an overview of the history, development, and processing in passive radar and enable the interested reader to further investigate the subject exploiting the presented material together with the cited references.
Journal ArticleDOI
Tandem-L: A Technical Perspective on Future Spaceborne SAR Sensors for Earth Observation
Sigurd Huber,Felipe Queiroz de Almeida,Michelangelo Villano,Marwan Younis,Gerhard Krieger,Alberto Moreira +5 more
TL;DR: The beamforming architecture on receive for Tandem-L, which would apply in general to planar multielevation beam SAR antennas with Scan-On-Receive capabilities, is presented and options for high azimuth resolution imaging as well as a beamforming method for enhanced range ambiguity suppression are addressed.
Proceedings ArticleDOI
Denoising of single-look SAR images based on variance stabilization and nonlocal filters
TL;DR: The performance of nonlocal filters applied to the denoising of single-look SAR images corrupted by speckle with a Rayleigh distribution is evaluated, taking advantage of exact forward and inverse variance-stabilizing transformations.
Proceedings ArticleDOI
Blind evaluation of additive noise variance in textured images by nonlinear processing of block DCT coefficients
TL;DR: It is shown that the proposed approach based on the fact that the statistical properties of DCT coefficients corresponding to high spatial frequencies in small size blocks greatly depend upon noise variance can be processed in nonlinear manner in order to eliminate the influence of informative component of the image itself.
Journal ArticleDOI
Nadir Echo Removal in Synthetic Aperture Radar via Waveform Diversity and Dual-Focus Postprocessing
TL;DR: This letter describes how to design an SAR system without the nadir interference constraint and how to remove (not only smear) thenadir echoes by means of waveform diversity on transmit and appropriate postprocessing.