Daily monitoring of the mediterranean sea by Geosynchronous SAR

Braun, Hans Martin; Baessler, Holger; Jonas, Carsten

doi:10.1109/radar.2016.7485226

Cited by 4 publications

(2 citation statements)

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“…SAR imaging using satellites in high elliptical orbits can provide high-resolution wide-swath images and has drawn extensive research interests [1,2]. A bistatic SAR system with a geosynchronous satellite transmitter and a low earth orbit receiver was designed [3], and an overlapped subaperture imaging algorithm was proposed [4] to realize high-resolution wide-swath imaging for SAR in elliptical orbits.…”

Section: Introductionmentioning

confidence: 99%

High-eccentricity Orbit Synthetic Aperture Radar with Multi-parameters Joint Agile Variation

Lu,

Xu,

Huang

et al. 2023

PIER M

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The variable orbit altitude and platform velocity in high-eccentricity orbit synthetic aperture radar (HEO SAR) increase the difficulty in obtaining effective radar echoes. In this paper, a new stripmap imaging mode with multi-parameter joint agile variation in HEO-SAR is proposed. First, the range sidelooking angle is adjusted during the whole raw data acquisition interval according to the time-varying side-looking geometric relationship, while the pulse repetition frequency (PRF) is continuously changed to obtain uniform azimuth sampling due to the satellite velocity variation. Besides simultaneously adjusting the side-looking angle and the operated PRF, echo sampling start time and range sampling points are also continuously changed to decrease the echo data rate. According to the echo characteristics in HEO SAR, its corresponding imaging algorithm is presented, which includes range samples adjustment, azimuth resampling, cubic filtering, nonuniform Fourier fast transform (NUFFT) for nonlinear range cell migration correction (RCMC) and modified azimuth compression. A system design example with multi-parameters joint agile variation for the desired resolution of 3 m and the swath width of 30 km is given, while imaging simulation experiments on point targets are carried out. Both simulation results of multi-parameters variation design and point targets imaging validate the proposed stripmap imaging mode with multi-parameters joint agile variation in HEO SAR.

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Section: Introductionmentioning

confidence: 99%

High-eccentricity Orbit Synthetic Aperture Radar with Multi-parameters Joint Agile Variation

Lu,

Xu,

Huang

et al. 2023

PIER M

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“…In 2016, Hans Martin et al put forward the design idea of daily monitoring of the whole Mediterranean region by using GEO SAR. It is demonstrated that the system can be realized based on today's scientific and technological level [32].…”

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confidence: 99%

Sub retrograde geosynchronous orbit SAR: parameter design and performance analysis

Li,

Zhang,

Liu

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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In recent years, Geosynchronous synthetic aperture radar (GEO SAR) has attracted many scientists to carry out relevant research. Its research is in-depth and gradually maturing. However, conventional GEO SAR has the problems of great influence by the earth's rotation, complex timing design, uneven flight speed in the whole orbit, and non orthogonal range and azimuth resolution, which limits it's application. A new concept of sub retrograde geosynchronous orbit SAR is proposed in this paper. Compared with traditional GEO SAR, the satellite has the advantages of less influence by the earth's rotation, simple timing, uniform motion speed in the whole orbit, shorter revisit time, better resolution and small space-variant in azimuth and range. The radar parameters of sub retrograde GEO SAR are designed. Through the research, it is found that the system sensitivity and resolution no longer change with the orbit position, and its timing design does not need to consider the range migration variation. In addition, the imaging characteristics of sub retrograde GEOSAR are investigated. The results show that, the range model can meet the imaging requirements as long as it is expanded to the fourth order. After that, the influence of orbit perturbation error in sub retrograde GEO SAR is given for the first time. Last, two ways to solve observation blind area of sub retrograde GEO SAR are proposed, one is to change the orbit inclination, another way is to use the bistatic mode. Index Terms-sub retrograde orbit, geosynchronous synthetic aperture radar (GEO SAR), system parameter design, performance analysis. I. INTRODUCTION INCE geosynchronous orbit synthetic aperture radar (GEO SAR) was proposed, it has attracted the attention of many researchers because of its short revisit period and wide observation swath. Scientists from the United States, China, Britain, Germany, Italy and other countries have carried out research on system design and imaging algorithms. In 1978, K. Tomiyasu first proposed the concept of GEO SAR [1], with the support of National Aeronautics and Space Administration (NASA), the parameter analysis of GEO SAR Manuscript received xx; revised xx ; accepted xx. Date of publication xx; date of current version xx.

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De-encapsulation and Decompression Algorithms for Level 0 Files of the ENVISAT Satellite in Image Mode

Franchi

Zozaya

2019

IEEE Latin Am. Trans.

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Daily monitoring of the mediterranean sea by Geosynchronous SAR

Cited by 4 publications

References 1 publication

High-eccentricity Orbit Synthetic Aperture Radar with Multi-parameters Joint Agile Variation

High-eccentricity Orbit Synthetic Aperture Radar with Multi-parameters Joint Agile Variation

Sub retrograde geosynchronous orbit SAR: parameter design and performance analysis

De-encapsulation and Decompression Algorithms for Level 0 Files of the ENVISAT Satellite in Image Mode

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