Effects of Earth rotation on GEO SAR characteristics analysis

Dong, Xichao; Gao, Yangte; Hu, Cheng; Zeng, Tao; Dong, Chao

doi:10.1109/cie-radar.2011.6159469

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…It can be seen that the velocity difference between the two is about 3∼6 times. Therefore, the effect of Earth's rotation on GEO SAR cannot be ignored [10]. Under the influence of the Earth's rotation, the GEO SAR has a curved trajectory compared to the LEO SAR.…”

Section: Feasibility Analysis and Special Issues In Geo Tomosarmentioning

confidence: 99%

Optimal data acquisition in multi‐pass geosynchronous SAR tomography

Zhang

Dong

et al. 2019

J. eng.

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Section: Feasibility Analysis and Special Issues In Geo Tomosarmentioning

confidence: 99%

Optimal data acquisition in multi‐pass geosynchronous SAR tomography

Zhang

Dong

et al. 2019

J. eng.

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“…Meanwhile it does not consider the influence of squint look. Thus some fixes must be made [8], and the corrected model is shown in Figure 4. …”

Section: Beam Footprint Velocitymentioning

confidence: 99%

“…(b), the beam footprint velocity induced by the r component of sr V(8), represents the elevation angle Then with the model shown inFigure 4(c), we can get the footprint velocity induced by the t component of sr V…”

mentioning

confidence: 99%

An improved velocity calculation model in GEO SAR system

Zeng

Yin

Zhao

et al. 2013

IET International Radar Conference 2013

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Velocity is an essential parameter in Synthetic Aperture Radar (SAR) system design. The conventional velocity calculation model is not applicable for Geosynchronous Earth Orbit Synthetic Aperture Radar (GEO SAR), so an improved velocity calculation model is proposed in this paper. Firstly, this paper analyses the type of satellite velocity which could be adopted in Doppler parameter calculation. Secondly, an improved calculation model of beam footprint velocity and effective satellite velocity are presented in consideration of the radial satellite velocity. Finally, relative parameters are expressed with the satellite velocity, beam footprint velocity and effective velocity.

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“…There has been an increasing interest in Geosynchronous Earth orbit SAR (GEO SAR) for the purpose of surveillance with large observation. In fact, this broadside-looking SAR has a non-zero-Doppler centroid due to the Earth's rotation and elliptical orbit effects [1]. Compensating the residual Doppler centroid is an important step to solve the rangeazimuth coupling which decreases the quality of SAR imaging.…”

Section: Introductionmentioning

confidence: 99%

Study on Zero-Doppler Centroid Control for GEO SAR Ground Observation

Jiang¹,

Hu²,

Zhang³

et al. 2014

International Journal of Antennas and Propagation

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In geosynchronous Earth orbit SAR (GEO SAR), Doppler centroid compensation is a key step for imaging process, which could be performed by the attitude steering of a satellite platform. However, this zero-Doppler centroid control method does not work well when the look angle of radar is out of an expected range. This paper primarily analyzes the Doppler properties of GEO SAR in the Earth rectangular coordinate. Then, according to the actual conditions of the GEO SAR ground observation, the effective range is presented by the minimum and maximum possible look angles which are directly related to the orbital parameters. Based on the vector analysis, a new approach for zero-Doppler centroid control in GEO SAR, performing the attitude steering by a combination of pitch and roll rotation, is put forward. This approach, considering the Earth’s rotation and elliptical orbit effects, can accurately reduce the residual Doppler centroid. All the simulation results verify the correctness of the range of look angle and the proposed steering method.

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Effects of Earth rotation on GEO SAR characteristics analysis

Cited by 10 publications

References 10 publications

Optimal data acquisition in multi‐pass geosynchronous SAR tomography

Optimal data acquisition in multi‐pass geosynchronous SAR tomography

An improved velocity calculation model in GEO SAR system

Study on Zero-Doppler Centroid Control for GEO SAR Ground Observation

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