The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
São apresentados um modo de operação eficaz e uma técnica de sincronização espaço-tempo para o radar de abertura sintética biestática híbrido espacial/aéreo (SA-BSAR) usando fontes de oportunidade. Nossa motivação reside no fato de que as abordagens existentes na literatura, onde a antena do transmissor deve ser direcionada, só podem ser utilizadas nos sistemas SAR híbridos biestáticos com transmissor cooperativo. O modo apresentado consiste em ampliar o feixe receptor com a finalidade de aumentar a extensão da cena em azimute. A inspiração vem da distância de recepção muito mais curta em comparação com a do SAR monoestático espacial. Isto significa que o ganho de recepção pode ser significativamente reduzido para fornecer a mesma relação sinal-ruído (SNR) em relação ao caso monoestático. A viabilidade do modo de feixe amplo é primeiro verificada preliminarmente por uma análise quantitativa do SNR e uma demonstração de que a frequência de repetição de pulso (PRF) usada no iluminador espacial pode facilmente satisfazer as restrições de PRF do SA-BSAR. A influência na relação entre ambiguidade e sinal do azimute (AASR) também é discutida e o fator de alargamento correspondente do máximo permitido para a largura de feixe do receptor é subsequentemente derivado. Em seguida, são deduzidas as fórmulas para cálculo do tempo de sobreposição, da extensão da cena e da resolução do azimute. Como não há lóbulos de grade no padrão de antena de satélite, uma vez que o iluminador não cooperativo normalmente opera no modo lateral, uma técnica existente para a sincronização espaço-tempo em sistemas híbridos cooperativos não pode ser aplicada diretamente. A modificação realizada e seu princípio subjacente são apresentados detalhadamente. Os resultados da simulação demonstram a eficácia do modo de feixe largo e mostram que, na maioria dos casos, uma extensão útil da cena (da ordem de pelo menos 1 km) pode ser alcançada com uma resolução de azimute aproximadamente equivalente em comparação com aquela em mono- SAR espacial estático. Em alguns casos, medidas explícitas para suprimir a ambigüidade do azimute devem ser tomadas para alcançar a extensão esperada da cena.
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Peng ZHOU, Yiming PI, "Wide-Beam Mode and Space-Time Synchronization of Antenna Footprints in Hybrid Bistatic SAR Systems Using Sources of Opportunity" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 4, pp. 1308-1317, April 2009, doi: 10.1587/transcom.E92.B.1308.
Abstract: An effective operation mode and a space-time synchronization technique for the spaceborne/airborne hybrid bistatic synthetic aperture radar (SA-BSAR) using sources of opportunity are presented. Our motivation lies in the fact that the existing approaches in the literature, where the transmitter antenna must be steered, can only be used in the hybrid bistatic SAR systems with cooperative transmitter. The presented mode is to widen the receiving beam for the purpose to increase the scene extension in azimuth. The inspiration comes from the much shorter receiving distance as compared to the one in mono-static spaceborne SAR. This means that the receiving gain can be significantly reduced to provide the same signal-to-noise ratio (SNR) with respect to the mono-static case. The feasibility of the wide-beam mode is first preliminarily verified by a quantitative analysis of SNR and a demonstration that the pulse repetition frequency (PRF) used in the spaceborne illuminator can easily satisfy the PRF constraints of the SA-BSAR. The influence on the azimuth ambiguity to signal ratio (AASR) is also discussed and the corresponding broadening factor of the maximum allowable for receiver beamwidth is subsequently derived. Afterwards, the formulae for calculating the overlap time, the scene extension and the azimuth resolution are deduced. As there are no grating lobes in satellite antenna pattern since the non-cooperative illuminator normally operates in the side-looking mode, an existing technique for the space-time synchronization in cooperative hybrid systems can not be directly applied. The modification performed and its underlying principle are presented in detail. The simulation results demonstrate the effectiveness of the wide-beam mode, and show that in most cases a useful scene extension (on the order of at least 1 km) can be achieved with a roughly equivalent azimuth resolution as compared to the one in mono-static spaceborne SAR. In some cases, explicit measures to suppress the azimuth ambiguity must be taken to achieve the expected scene extension.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.1308/_p
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@ARTICLE{e92-b_4_1308,
author={Peng ZHOU, Yiming PI, },
journal={IEICE TRANSACTIONS on Communications},
title={Wide-Beam Mode and Space-Time Synchronization of Antenna Footprints in Hybrid Bistatic SAR Systems Using Sources of Opportunity},
year={2009},
volume={E92-B},
number={4},
pages={1308-1317},
abstract={An effective operation mode and a space-time synchronization technique for the spaceborne/airborne hybrid bistatic synthetic aperture radar (SA-BSAR) using sources of opportunity are presented. Our motivation lies in the fact that the existing approaches in the literature, where the transmitter antenna must be steered, can only be used in the hybrid bistatic SAR systems with cooperative transmitter. The presented mode is to widen the receiving beam for the purpose to increase the scene extension in azimuth. The inspiration comes from the much shorter receiving distance as compared to the one in mono-static spaceborne SAR. This means that the receiving gain can be significantly reduced to provide the same signal-to-noise ratio (SNR) with respect to the mono-static case. The feasibility of the wide-beam mode is first preliminarily verified by a quantitative analysis of SNR and a demonstration that the pulse repetition frequency (PRF) used in the spaceborne illuminator can easily satisfy the PRF constraints of the SA-BSAR. The influence on the azimuth ambiguity to signal ratio (AASR) is also discussed and the corresponding broadening factor of the maximum allowable for receiver beamwidth is subsequently derived. Afterwards, the formulae for calculating the overlap time, the scene extension and the azimuth resolution are deduced. As there are no grating lobes in satellite antenna pattern since the non-cooperative illuminator normally operates in the side-looking mode, an existing technique for the space-time synchronization in cooperative hybrid systems can not be directly applied. The modification performed and its underlying principle are presented in detail. The simulation results demonstrate the effectiveness of the wide-beam mode, and show that in most cases a useful scene extension (on the order of at least 1 km) can be achieved with a roughly equivalent azimuth resolution as compared to the one in mono-static spaceborne SAR. In some cases, explicit measures to suppress the azimuth ambiguity must be taken to achieve the expected scene extension.},
keywords={},
doi={10.1587/transcom.E92.B.1308},
ISSN={1745-1345},
month={April},}
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TY - JOUR
TI - Wide-Beam Mode and Space-Time Synchronization of Antenna Footprints in Hybrid Bistatic SAR Systems Using Sources of Opportunity
T2 - IEICE TRANSACTIONS on Communications
SP - 1308
EP - 1317
AU - Peng ZHOU
AU - Yiming PI
PY - 2009
DO - 10.1587/transcom.E92.B.1308
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 4
JA - IEICE TRANSACTIONS on Communications
Y1 - April 2009
AB - An effective operation mode and a space-time synchronization technique for the spaceborne/airborne hybrid bistatic synthetic aperture radar (SA-BSAR) using sources of opportunity are presented. Our motivation lies in the fact that the existing approaches in the literature, where the transmitter antenna must be steered, can only be used in the hybrid bistatic SAR systems with cooperative transmitter. The presented mode is to widen the receiving beam for the purpose to increase the scene extension in azimuth. The inspiration comes from the much shorter receiving distance as compared to the one in mono-static spaceborne SAR. This means that the receiving gain can be significantly reduced to provide the same signal-to-noise ratio (SNR) with respect to the mono-static case. The feasibility of the wide-beam mode is first preliminarily verified by a quantitative analysis of SNR and a demonstration that the pulse repetition frequency (PRF) used in the spaceborne illuminator can easily satisfy the PRF constraints of the SA-BSAR. The influence on the azimuth ambiguity to signal ratio (AASR) is also discussed and the corresponding broadening factor of the maximum allowable for receiver beamwidth is subsequently derived. Afterwards, the formulae for calculating the overlap time, the scene extension and the azimuth resolution are deduced. As there are no grating lobes in satellite antenna pattern since the non-cooperative illuminator normally operates in the side-looking mode, an existing technique for the space-time synchronization in cooperative hybrid systems can not be directly applied. The modification performed and its underlying principle are presented in detail. The simulation results demonstrate the effectiveness of the wide-beam mode, and show that in most cases a useful scene extension (on the order of at least 1 km) can be achieved with a roughly equivalent azimuth resolution as compared to the one in mono-static spaceborne SAR. In some cases, explicit measures to suppress the azimuth ambiguity must be taken to achieve the expected scene extension.
ER -