The Accurate Fourth-Order Doppler Parameter Calculation and Analysis for Geosynchronous Sar

Zhao, Baozhen; Qi, Xiangyang; Song, Hongjun; Gao, Wenjun; Han, Xiaolei; Chen, Run Pu

doi:10.2528/pier13031315

Cited by 13 publications

(21 citation statements)

References 16 publications

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“…In [22], the author proposed an accurate fourth-order Doppler parameter calculation approach for GEO SAR based on the state vectors of the satellite and targets, including the range vector, velocity vector, and acceleration vector, where the twobody model and the rotation of the Earth are considered. The attitude of the satellite is actively controlled by attitude steering so that the Doppler offset is reduced to be nearly zero [23].…”

Section: B Drm4mentioning

confidence: 99%

A Novel High-Order Range Model and Imaging Approach for High-Resolution LEO SAR

Luo

Zhao

Han

et al. 2014

IEEE Trans. Geosci. Remote Sensing

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High-resolution spaceborne synthetic aperture radar (SAR) mainly poses two challenges to signal processing. The first challenge involves the signal model, where a precise range equation of spaceborne SAR should be considered as the conventional hyperbolic range equation fails to precisely describe the range history in the high-resolution case. The second challenge is an efficient focusing algorithm since the existing SAR processors are inaccurate or inefficient for high-resolution spaceborne SAR. Therefore, in this paper, a novel fourth-order polynomial range equation based on Doppler parameters is proposed, and the method for parameter determination is also addressed. Compared with conventional range equations, the presented one is more accurate and concise for low-earth-orbit SAR so that a higher azimuth resolution can be achieved. Based on the range model, a 2-D spectrum is derived, and an extended range Doppler domain algorithm for SAR image formation in the sliding spotlight mode is also developed. Additionally, we carried out several simulations to validate the presented approach. Results demonstrate high performances of the focusing algorithm as well as the range equation.Index Terms-Fourth-order Doppler range model (DRM4), high resolution, low earth orbit (LEO), range Doppler algorithm (RDA).

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Section: B Drm4mentioning

confidence: 99%

A Novel High-Order Range Model and Imaging Approach for High-Resolution LEO SAR

Luo

Zhao

Han

et al. 2014

IEEE Trans. Geosci. Remote Sensing

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“…The calculation approach of f dc , f 1r , f 2r and f 3r are given in [6], and the expressions of f 4r and f 5r are presented as follows. …”

Section: Accurate Signal Modelmentioning

confidence: 99%

“…To get the accurate Doppler parameters, it is important to model the geometry between the motion of the sensor and the target on the Earth surface. The calculation approach of the 1-4 th order Doppler parameters has been presented in [6], and the 5-6 th order parameters calculation approach will be given in this paper. This new range model is named as the 6-th order Doppler parameter Range Model (DRM-6) in this paper.…”

Section: Introductionmentioning

confidence: 99%

A new approach for spotlight geosynchronous SAR data focusing

Zhao¹,

Xiang-yang²,

Song³

et al. 2013

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS

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Besides the evident superiority, the Geosynchronous Earth orbit synthetic aperture radar (Geo-SAR) system meets great more challenges than the current Low-Earth-Orbital SAR (Leo-SAR) and the Medium-Earth-Orbit SAR (Meo-SAR). The signal processing approach for spotlight mode Geo-SAR is discussed in this paper. A new range model called the sixth-order Doppler parameter range model (DRM-6) is derived based on the accurate sixth-order Doppler parameter calculation algorithm. The accuracy of Hyperbolic Range equation (HRE) and the DRM-6 are compared. According to the non-linear property of the synthetic aperture, the Back projection algorithm is chosen for image formation. At last the simulation results validate that DRM-6 has a good effect on the L-Band spotlight Geo-SAR system with a azimuth resolution around 2m.

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“…However, the letter ignored the effects of orbital perturbation. A discussion on the effects of the third-order geopotential perturbation on Doppler parameters can be found in [9]. Unlike the LEO SAR, not only the geopotential perturbation but also the luni-solar effects and the solar radiation pressure should be taken into account as the orbit height rises to the geosynchronous orbit.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Orbital Perturbation on Geosynchronous Synthetic Aperture Radar Imaging

Jiang

Ding

et al. 2015

IEEE Geosci. Remote Sensing Lett.

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Compared with current low-Earth-orbit synthetic aperture radar (SAR), geosynchronous SAR (GEO SAR) is featured with its ultrahigh orbit and ultralong integration time. In this letter, we answer the question whether the orbital perturbation items have effects on GEO SAR imaging during the long integration time and, if so, how they produce errors. To achieve these goals, we first develop a perturbing orbital elements errors model based on perturbation analysis. Then, we propose an accurate analytical expression of first to fourth Doppler parameters for GEO SAR and analyze the effects of perturbing orbital elements errors on the Doppler parameters. Furthermore, the relationship between the perturbing Doppler errors and the phase coherence of GEO SAR signal is deduced. Experiment and simulation results demonstrate the image defocusing caused by orbital perturbation. The conclusions are that the orbital perturbation does affect GEO SAR imaging by producing nonnegligible phase errors and that the required accuracy of the orbit determination should be at centimeter level in the radial direction.Index Terms-Doppler parameters, geosynchronous synthetic aperture radar (GEO SAR), orbital perturbation, SAR imaging.

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The Accurate Fourth-Order Doppler Parameter Calculation and Analysis for Geosynchronous Sar

Cited by 13 publications

References 16 publications

A Novel High-Order Range Model and Imaging Approach for High-Resolution LEO SAR

A Novel High-Order Range Model and Imaging Approach for High-Resolution LEO SAR

A new approach for spotlight geosynchronous SAR data focusing

The Effects of Orbital Perturbation on Geosynchronous Synthetic Aperture Radar Imaging

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