Sökning: "Autofocus"

Hittade 5 avhandlingar innehållade ordet Autofocus.

  1. 1. Factorized Geometrical Autofocus for Synthetic Aperture Radar Processing

    Författare :Jan Torgrimsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Back-Projection; PGA; SAR; UWB; Autofocus; FGA;

    Sammanfattning : Synthetic Aperture Radar (SAR) imagery is a very useful resource for the civilian remote sensingcommunity and for the military. This however presumes that images are focused. There are severalpossible sources for defocusing effects. For airborne SAR, motion measurement errors is the maincause. LÄS MER

  3. 2. Factorized Geometrical Autofocus for Synthetic Aperture Radar Processing

    Författare :Jan Torgrimsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Autofocus; FGA; Synthetic Aperture Radar SAR ; FFBP; PGA; Ultra-Wideband; Back-Projection; VHF-Band; CARABAS;

    Sammanfattning : .... LÄS MER

  4. 3. SAR Image Focus Errors due to Incorrect Geometrical Positioning in Fast Factorized Back-Projection

    Författare :Annelie Wyholt; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Back-Projection; topography effects; range distortions; Autofocus; SAR;

    Sammanfattning : Synthetic Aperture Radar, SAR, is an aperture synthesis technique to generate an image of the ground from air or space with high resolution. Signal processing is performed in frequency domain with Fourier Transform techniques, or in time domain with Back Projection techniques. LÄS MER

  5. 4. Programming of coarse-grained reconfigurable architectures

    Författare :Zain Ul-Abdin; Bertil Svensson; Veronica Gaspes; Dag Stranneby; Mario Porrmann; Örebro universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TECHNOLOGY; TEKNIKVETENSKAP; Computer science; Datavetenskap; Datalogi; Computer and Systems Science;

    Sammanfattning : Coarse-grained reconfigurable architectures, which offer massive parallelism coupled with the capability of undergoing run-time reconfiguration, are gaining attention in order to meet not only the increased computational demands of high-performance embedded systems, but also to fulfill the need of adaptability to functional requirements of the application. This thesis focuses on the programming aspects of such coarse-grained reconfigurable computing devices, including the relevant computation models that are capable of exposing different kinds of parallelism inherent in the application and the ability of these models to capture the adaptability requirements of the application. LÄS MER

  7. 5. Estimation Problems in Array Signal Processing, System Identification, and Radar Imagery

    Författare :Richard Abrahamsson; Peter Stoica; A. Lee Swindlehurst; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Parameter Estimation; Array Signal Processing; STAP; SAR; Ground Penetrating Radar; System Identification; Bilinear Models; Covariance Matrix Estimation; Signal processing; Signalbehandling; Signalbehandling; Signal Processing;

    Sammanfattning : This thesis is concerned with parameter estimation, signal processing, and applications. In the first part, imaging using radar is considered. More specifically, two methods are presented for estimation and removal of ground-surface reflections in ground penetrating radar which otherwise hinder reliable detection of shallowly buried landmines. LÄS MER