Zastosowanie metod CLEAN do poprawy jakości obrazów SAR

Kulpa, K.; Smolarczyk, M.

Artykuł - szczegóły

Tytuł artykułu

Zastosowanie metod CLEAN do poprawy jakości obrazów SAR

Autorzy

Kulpa K. , Smolarczyk M.

Identyfikatory

Warianty tytułu

SAR image enhancement by applying of CLEAN algorithms

Języki publikacji

Abstrakty

Obrazy SAR otrzymywane są w wyniku dwuwymiarowego przetwarzania obrazu SAR (kompresji odległościowej i azymutalnej). Efektem ubocznym dwuwymiarowej kompresji sygnału jest powstanie azymutalnych i odległościowych listków bocznych, co powoduje, że każdemu silnemu obiektowi w obrazie SAR towarzyszą charakterystyczne listki boczne widoczne na obrazie w postaci krzyża. Występujące listki boczne powodują, że słabo odbijające obiekty, znajdujące się w otoczeniu silnie odbijających punktów, maskowane są przez ich listki boczne. W artykule przedstawione zostaną metody usuwania silnych ech z sygnału radarowego z wykorzystaniem metod modelowania sygnałów pochodzących od obiektów silnie odbijających oraz ich adaptacyjnego odejmowania, znanych w literaturze pod nazwą CLEAN, pozwalające na poprawę jakości otrzymanego zobrazowania ziemi.

SAR imaging process is a method of ground mapping alternative to different optical systems and allows to obtain SAR maps of Earth independently to time (day and night) and weather conditions. Additionally maximum range of radar sensors is much longer than any optical. Final SAR image is a result of two-dimensional, in-range and in-azimuth, compression process. A strong scatterer produces sidelobes in range and cross-range dimension forming characteristic cross-shaped pattern centred on dominant scatterer. The presence of these sidelobes decrease the overall image quality and can mask weak scatterers close to the strong one. The paper presents method of adaptive removal of modeled strong scatterer echoes from raw radar data denoted as CLEAN algorithm. Applied CLEAN algorithms results in higher image dynamic range (10 ÷ 30 dB), visibility of weakly scatterers and finally SAR image enhancement.

Słowa kluczowe

obraz SAR poprawa jakości obrazu usuwanie ech z sygnału radarowego Clean

CLEAN algorithm SAR image echoes from raw radar

Wydawca

Przemysłowy Instytut Telekomunikacji

Czasopismo

Prace Przemysłowego Instytutu Telekomunikacji

Rocznik

2008

Tom

Vol.58, z.141/142

Strony

54--69

Opis fizyczny

Bibliogr. 67 poz., il.

Twórcy

autor

Kulpa K.

autor

Smolarczyk M.

Instytut Podstaw Elektroniki Politechniki Warszawskiej

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-article-BWA9-0032-0015