A New Method of Zero-Doppler Centroid Control in GEO SAR

Li, Teng; Dong, Xichao; Hu, Cheng; Zeng, Tao

doi:10.1109/lgrs.2010.2089969

Cited by 69 publications

(36 citation statements)

References 12 publications

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“…Combined with the electrical beam steering, the irregular illumination of radar converts to conventional SAR modes. With the zero-doppler centroid control method based on phase scan [6] , it can compensate the doppler shift induced by earth's rotation and the GEO SAR's elliptical orbit. After the compensation, the complexity of focussing algorithm can be reduced.…”

Section: Beam Steering Control Modementioning

confidence: 99%

“…The most representative study on GEOSAR system was introduced Cranfield University Aerospace Research Center and NASA's Jet Propulsion Laboratory respectively, involving in the orbit selection, launch system, beam forming, antenna designing, etc. [3] , As for the signal characteristic, resolution calculation, and imaging algorithms, there is a little related literature on GEO in range and azimuth is serious, combined with the curve trajectory GEO SAR model, not the linear trajectory [4][5][6][7][8][9] , even the atmosphere impact on the SAR focusing need to consider [10] . Furthermore, the doppler phase history become complex with the high order phase error, and the nonzero-Doppler centroid and the nonlinear varied FM rate are caused by Earth's rotation and the elliptical orbit, leading to azimuth ambiguities and degradation of imaging performance, with the radar echo approximated a non-stationary signal or polynomial phase signal varied with illuminated time, which increase the difficulty of SAR processing.…”

Section: Introductionmentioning

confidence: 99%

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Sub-Aperture Focusing Algorithm of Geosynchronous Sar

Zhang

et al. 2013

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Synthetic Aperture Radar (SAR) on the geosynchronous orbit has the advantage in remote sensing, with high resolution to provide a large coverage in a short visit time. the space-variant coverage and range-azimuth couple of GEO SAR are required to compensate, using the electrical beam steering, the irregular data acquisition can be convert to classical SAR modes, such as stripmap, spotlight, sliding spotlight, and terrain observation by progressive scans (TOPS) SAR, the dopper analysis of these work modes of SAR have been studied. Based on deramping processing and improved subaperture chirp scaling algorithm, a novel focusing approach is presented in this paper, whose performance is determined by the work mode, data acquisition and the deramping processing. Data of each mode can be focused by utilizing this presented approach with the information of subapterture centroid time and range rotation center. Simulation results are presented to validate the analysis of the proposed approach.

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Section: Beam Steering Control Modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sub-Aperture Focusing Algorithm of Geosynchronous Sar

Zhang

et al. 2013

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…Refs. [6,7] and [8] proposes a Total Zero Doppler Steering (TZDS) method by exploiting an additional pitch steering. This method is applied in the TerraSAR-X system and suppresses the Doppler centroid to tens of Hz all over the range swath [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…This paper studies the attitude steering problem and proposes a new method to calculate the yaw steering angle with zero pitch steering angle or with a given pitch steering angle. The former formula can be used to perform 1-D yaw steering in the SAR systems with one coordinate axis pointing toward the earth center [6,7]; the latter can be used to perform 1-D yaw steering in the SAR systems with one coordinate axis pointing perpendicular to the earth surface [5] or to refine the performance of TZDS.…”

Section: Introductionmentioning

confidence: 99%

Study on Attitude Control Method for Zero-Doppler Steering in Space Borne Sar System

Zhao¹,

Wei²

2016

PIER Letters

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Abstract-For the spaceborne synthetic aperture radar (SAR) system, in order to alleviate the complexity of the imaging algorithm and to improve the accuracy of the applications of SAR images, attitude steering is required to reduce the Doppler centroid to 0 Hz. In published literature, twodimensional attitude steering, including yaw and pitch steering, is employed for elliptic orbiting SAR systems. This paper proposes a new steering approach involving only yaw steering to suppress the Doppler centroid of the mid-range to theoretically 0 Hz with a low residual Doppler centroid at the edge of the range extent. This may reduce the complexity of the attitude control system. The comparison of the performances of the current applied methods and the proposed approach is carried out with a simulation, and the effectiveness of the new approach is validated by the results.

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“…Conventional GeoSAR usually undergoes a "8"-like track, and the whole track is not fully utilized [1,2].…”

Section: Introductionmentioning

confidence: 99%

Efficient Geosynchronous Circular Sar Raw Data Simulation of Extended 3-D Scenes

Liu¹,

Hong²,

Tan³

et al. 2012

PIER

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Abstract-Geosynchronous Circular Synthetic Aperture Radar (GeoCSAR) has the Circular SAR configuration and undergoes a nearellipse geosynchronous track rather a "8"-like track of conventional GeoSAR. It could produce three dimensional (3-D) images of extended Earth scenes. GeoCSAR raw data simulator is of vital for predicting system performance, developing suitable data processing algorithms, etc.. It should include degrading conditions such as motion instability, angular deviations and orbit perturbations in order to approach the real situation. The common generation algorithm of raw data in time domain is precise but time-consuming for extended 3-D scene. In this paper, a novel raw data simulation algorithm based on inverse Improved Polar Format Algorithm (IPFA) for GeoCSAR was proposed, which possessed both the advantages of precision of time domain simulator and efficiency of frequency domain simulator. Implementation details were presented, and several simulation results were provided and analyzed to validate the algorithm.

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A New Method of Zero-Doppler Centroid Control in GEO SAR

Cited by 69 publications

References 12 publications

Sub-Aperture Focusing Algorithm of Geosynchronous Sar

Sub-Aperture Focusing Algorithm of Geosynchronous Sar

Study on Attitude Control Method for Zero-Doppler Steering in Space Borne Sar System

Efficient Geosynchronous Circular Sar Raw Data Simulation of Extended 3-D Scenes

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