<title>Ultrawideband VHF SAR design and measurements</title>

Preliminary design of a space system operating a ground-penetrating radar

“…Furthermore, this effects can also be seen as a range variation of subsurface targets with respect to superficial ones, which can be investigated to put them in evidence [17]. As a matter of fact, capability to separate superficial echoes is a key issue in exploitation of remotely operated GPRs, as shown in [8,9], and it is advisable, a thorough test campaign for calibrating airborne and spaceborne GPRs by making use of reference scatterers representing expected subsurface structures, which could act as buried corner reflectors and/or active radar calibrators. A 20-MHz range chirp allows ground range resolution of the order of 10 m at the selected heights for a 35 • nominal look angle.…”

“…It is basically an advanced side-looking SAR operating at a 1.5/2 m wavelength, which allows to penetrate dry soil up to 100 m. CARABAS (Coherent All Radio Band Sensing) is another airborne SAR, mounted on board a Rockwell Sabreliner, designed by FOA (National Institute of Research for Defence) in Sweden, for vegetation penetration and buried objects monitoring [8]. This sensor, operating in the VLF band with 5-m antennas, was developed and tested in 1992.…”

Theory of synthetic aperture radar imaging of a moving target

“…By eliminating the slow-time parameter , the above expressions can be converted into a quadratic equation that specifies the moving target migration trajectory in the SAR image as (10) Note from (10) that the apparent slant range of the target or the apex of the conic migration curve in the image is less than the true target range ; the discrepancy varies with . A similar relation also holds between the apparent and the true ground range of the target.…”

Influência de Operações Morfológicas em Algoritmo de Detecção de Alvos para Imagens SAR VHF UWB

“…Neste cenário estão inseridos a família de radares suecos Coherent All Radio BAnd Sensing (CARABAS), os quais vêm sendo desenvolvidos desde o início da década de noventa pela SAAB em parceria com a Swedish Defence Research Agency (FOI) [8], [9]. Os dados gerados pelos sistemas CARABAS permitem a geração de diversos produtos, desde mapas topográficos de alta resolução, até algoritmos de detecção de alvos.…”