Total Zero Doppler Steering—A New Method for Minimizing the Doppler Centroid

Fiedler, Hauke; Boerner, E.; Mittermayer, Josef; Krieger, Gerhard

doi:10.1109/lgrs.2005.844591

Cited by 104 publications

(58 citation statements)

References 10 publications

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“…Therefore, the smart imaging mode is required, which can be employed for illuminating the scene along a given direction by implementing threeaxis attitude steering. In current spaceborne SAR systems, the main purpose of attitude steering is to minimize the Doppler centroid frequency, such as the one-axis (yaw) steering method with the circular orbit assumption [4], and the two-axis (yaw and pitch) steering method by taking the eccentricity into consideration [5]. In this letter, a novel attitude steering method is proposed for the smart imaging mode with three-axis (yaw, pitch and roll) steering.…”

Section: Spaceborne Sar Attitude Steering Methods For Smart Imaging Modementioning

confidence: 99%

Spaceborne SAR attitude steering method for smart imaging mode

Yang

Liu

et al. 2017

Electron. lett.

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The current spaceborne synthetic aperture radar (SAR) systems are operated to illuminate the scene along the satellite flying direction. However, in many cases, the interested areas are not parallel to the flying direction, so an innovative smart imaging mode is acquired, which can be employed for illuminating scene along a given direction. In this paper, a novel three-axis attitude steering method is proposed for smart imaging mode. First, mathematical model of the attitude steering is built by considering the restrictive conditions of zero Doppler centroid requirement and the position of interested area. Then, an iterative optimization algorithm is designed to calculate the three-axis steering angles. Finally, experiment results using the satellite tool kit (STK) tool validate the proposed methods well, especially in the case of coastline imaging.Introduction: State-of-the-art spaceborne SAR systems have the capability of operating in different imaging modes, such as stripmap, ScanSAR, spotlight, Terrain Observation by Progressive Scans (TOPS), and sliding spotlight [1][2]. However, all of the imaging modes illuminate the scene along the satellite flying direction. It means that if the interested area is not along the flying direction, more SAR observations from different satellite orbits at different times are required, which will take a long time to cover the interested area. The ScanSAR or TOPS mode can be employed to mitigate this problem by enlarging the range-swath coverage, but at the cost of resolution [3]. Therefore, the smart imaging mode is required, which can be employed for illuminating the scene along a given direction by implementing threeaxis attitude steering. In current spaceborne SAR systems, the main purpose of attitude steering is to minimize the Doppler centroid frequency, such as the one-axis (yaw) steering method with the circular orbit assumption [4], and the two-axis (yaw and pitch) steering method by taking the eccentricity into consideration [5]. In this letter, a novel attitude steering method is proposed for the smart imaging mode with three-axis (yaw, pitch and roll) steering. The mathematical model of attitude steering is first derived by considering the restrictive conditions of zero Doppler centroid requirement and the position of interested area, followed by the optimization algorithm for three-axis steering; finally, experiments are performed to validate the proposed method.

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Section: Spaceborne Sar Attitude Steering Methods For Smart Imaging Modementioning

confidence: 99%

Spaceborne SAR attitude steering method for smart imaging mode

Yang

Liu

et al. 2017

Electron. lett.

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“…This method provides a minimal shift of the Doppler spectrum by the order of some Hz and thus eases the SAR processing [24].…”

Section: Investigating Further Potential Of Terrasar-xmentioning

confidence: 99%

Status Report on the TerraSAR-X Mission

Buckreuss

Roth

2008

IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium

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“…In order to suppress the Doppler centroid to 0 Hz, attitude steering method is applied to point the antenna beam centerline in the direction of Doppler zero-line. The effectiveness of the attitude steering methods has been validated in advanced space borne SAR systems including TerraSAR-X [4,5], to name a few.…”

Section: Introductionmentioning

confidence: 99%

“…[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]. However, this method suppresses the Doppler centroid at the cost of increasing the complexity of the SAR system since it requires attitude steering on two dimensions.…”

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%

See 1 more Smart Citation

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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Total Zero Doppler Steering—A New Method for Minimizing the Doppler Centroid

Cited by 104 publications

References 10 publications

Spaceborne SAR attitude steering method for smart imaging mode

Spaceborne SAR attitude steering method for smart imaging mode

Status Report on the TerraSAR-X Mission

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

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