On Azimuthal Resolution of the Lunar-Based SAR Under the Orbital Perturbation Effects

This article studies the orbital perturbation effects on the azimuthal resolution in lunar-based synthetic aperture radar (LBSAR). We derive explicit expressions for the Doppler frequency modulation rate (DFMR) and beam-crossing velocity using the antenna beam pointing and orbit models. Following th...

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Veröffentlicht in:IEEE transactions on geoscience and remote sensing Jg. 61; S. 1 - 17
Hauptverfasser: Xu, Zhen, Chen, Kun-Shan, Guo, Huadong
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Antennas
Azimuthal resolution
beam-crossing velocity
Beams (radiation)
Doppler effect
Doppler frequency modulation rate (DFMR)
Doppler sonar
Earth
Frequency dependence
Frequency modulation
Geometry
Look angles (tracking)
lunar-based synthetic aperture radar (LBSAR)
Orbital elements
orbital perturbation
Perturbation
Perturbation methods
Perturbations
Planetary orbits
Radar
Resolution
SAR (radar)
Synthetic aperture radar
ISSN:0196-2892, 1558-0644
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Zusammenfassung:This article studies the orbital perturbation effects on the azimuthal resolution in lunar-based synthetic aperture radar (LBSAR). We derive explicit expressions for the Doppler frequency modulation rate (DFMR) and beam-crossing velocity using the antenna beam pointing and orbit models. Following that, the azimuthal resolution is expressed in line with orbital elements and synthetic aperture radar (SAR) configurations. The results show that the long-term orbital variations caused by accumulated perturbation effects significantly affect the azimuthal resolution, which, in effect, produces aperiodic variations in the azimuthal resolution. Such a phenomenon is most distinguished for a large LBSAR look angle, leading to a fluctuation of over 30% or even larger in the azimuthal resolution across different cycles. In addition, the errors given rise by short-term orbital perturbations could impact azimuthal resolution to a lesser extent, with corresponding fluctuations consistently below 3%. The findings reveal that it is imperative to consider the irregular variability of azimuthal resolution due to orbital perturbations in the LBSAR.
Bibliographie:ObjectType-Article-1
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content type line 14
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2023.3266548