System concepts and technologies for high orbit SAR

Moussessian, A.; Chen, C.; Edelstein, W.; Madsen, S.N.; Rosen, P. A.

doi:10.1109/mwsym.2005.1517017

Cited by 50 publications

(21 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with LEO SAR, the medium Earth orbit (MEO) SAR has better accessibility and greater coverage. 4,5 However, along with the ascension of the orbit, the relative Satellite-Earth geometry of the MEO SAR will significantly deviate from a straight line, which poses many challenges for spaceborne SAR signal processing, particularly the imaging part.…”

Section: Introductionmentioning

confidence: 99%

Higher order nonlinear chirp scaling algorithm for medium Earth orbit synthetic aperture radar

Wang

Liu

Chen

et al. 2015

J. Appl. Remote Sens

View full text Add to dashboard Cite

Abstract. Due to the larger orbital arc and longer synthetic aperture time in medium Earth orbit (MEO) synthetic aperture radar (SAR), it is difficult for conventional SAR imaging algorithms to achieve a good imaging result. An improved higher order nonlinear chirp scaling (NLCS) algorithm is presented for MEO SAR imaging. First, the point target spectrum of the modified equivalent squint range model-based signal is derived, where a concise expression is obtained by the method of series reversion. Second, the well-known NLCS algorithm is modified according to the new spectrum and an improved algorithm is developed. The range dependence of the twodimensional point target reference spectrum is removed by improved CS processing, and accurate focusing is realized through range-matched filter and range-dependent azimuth-matched filter. Simulations are performed to validate the presented algorithm. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract

Section: Introductionmentioning

confidence: 99%

Higher order nonlinear chirp scaling algorithm for medium Earth orbit synthetic aperture radar

Wang

Liu

Chen

et al. 2015

J. Appl. Remote Sens

View full text Add to dashboard Cite

show abstract

“…In some specific areas, the nearly continuous monitoring can be achieved. For these reasons, GEO SAR can play an important role in future disaster monitoring and alarm [3][4][5], as well as some other application fields such as land measurement, soil moisture monitoring, atmosphere vapor map, micro-deformation monitoring, etc.…”

Section: Introductionmentioning

confidence: 99%

“…At present, the related literature about GEO SAR is mainly focused on the system parameters design, ionosphere and atmosphere effect, and application requirements [10,11]. Hobbs et al firstly studied the impacts of troposphere and ionosphere on GEO SAR imaging [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

An Improved Nonlinear Chirp Scaling Algorithm Based on Curved Trajectory in Geosynchronous Sar

Hu¹,

Li²,

Tian³

2013

PIER

View full text Add to dashboard Cite

Abstract-Geosynchronous synthetic aperture radar (GEO SAR) has the characteristics of long aperture time and large imaging area. Therefore, the conventional imaging algorithm in Low Earth Orbit (LEO) SAR loses effect. In this paper, based on curved trajectory model under an ideal acquisition and not considering some acquisition perturbations (atmosphere, orbital deviations), an accurate two-dimensional frequency spectrum is analytically obtained via series reversion principle and high order Taylor expansion. Then, an improved Nonlinear Chirp Scaling (NCS) algorithm is proposed in GEO SAR, which includes novel range migration correction factor, coupling phase compensation factor, NCS factor and azimuth compression function. Finally, the correctness of the proposed NCS algorithm is verified via imaging results of point array targets and area targets.

show abstract

“…SAR in geosynchronous orbit, presented by Tomiyasu [1] , has significant advantages over conventional LEO SAR, which runs the same cycle and Earth's rotation period, the observation range is conducive to continuous real-time monitoring with the short revisit cycle. Research literatures of GEO SAR provide disaster areas monitoring in the range of several hours daily [2] . 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.…”

Section: Introductionmentioning

confidence: 99%

Sub-Aperture Focusing Algorithm of Geosynchronous Sar

Zhang

et al. 2013

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

View full text Add to dashboard Cite

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.

show abstract

System concepts and technologies for high orbit SAR

Cited by 50 publications

References 6 publications

Higher order nonlinear chirp scaling algorithm for medium Earth orbit synthetic aperture radar

Higher order nonlinear chirp scaling algorithm for medium Earth orbit synthetic aperture radar

An Improved Nonlinear Chirp Scaling Algorithm Based on Curved Trajectory in Geosynchronous Sar

Sub-Aperture Focusing Algorithm of Geosynchronous Sar

Contact Info

Product

Resources

About