Synthetic aperture radar tomography sampling criteria and three-dimensional range migration algorithm with elevation digital spotlighting

Tan, Weixian; Hong, Wen; Wang, Yanping; Lin, Yun; Wu, Yirong

doi:10.1007/s11432-009-0003-2

Cited by 8 publications

(10 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Until now, two LA-3D-SAR systems have been developed, 9,10 and some 3-D image formation algorithms have been proposed. [11][12][13][14][15][16] As a multichannel coherent system, LA-3D-SAR is particularly susceptible to channel inconsistency, which will cause geometric distortion, loss of resolution, decrease in image contrast, spurious targets, and a reduction in signal-to-noise ratio (SNR). 17 However, under realistic operational conditions, the antenna elements are subject to array errors such as multichannel amplitude-phase errors and antenna position errors.…”

Section: Introductionmentioning

confidence: 99%

Array error calibration methods in downward-looking linear-array three-dimensional synthetic aperture radar

Tan

Huang

Han

et al. 2016

J. Appl. Remote Sens

Self Cite

View full text Add to dashboard Cite

, "Array error calibration methods in downward-looking linear-array three-dimensional synthetic aperture radar," J. Appl. Remote Sens. 10(2), 025010 (2016), doi: 10.1117/1.JRS.10.025010. Abstract. In order to achieve high-precision three-dimensional (3-D) imaging with an airborne downward-looking linear-array 3-D synthetic aperture radar (LA-3D-SAR), a uniform virtual antenna array can be obtained by aperture synthesis of the cross-track sparse multiple-inputmultiple-output array. However, the actual 3-D imaging quality is unavoidably degraded by array errors such as the multichannel amplitude-phase errors due to the nonideal antenna characteristics, and the virtual element position errors due to vibrations and motion measurement deviations. We investigate the effects of these errors on the forms and the degrees of image quality degradation and consider the use of corresponding calibration methods to eliminate the effects of errors. For the multichannel amplitude-phase errors, the target response is subject to an integrated sidelobe level increase introduced by the phase error, which can be calibrated based on external (parallel or point target) calibrators, as proposed in the paper. For the virtual element position errors, they mainly the result of contrast degradation and noise in the image along the cross-track direction and have little impact on the range and along-track directions. The imaging performance is more sensitive to the error component in the height direction as compared to other components, the precision requirement of which should be established as the calibration reference. A calibration method based on time-divided active calibrators is proposed to estimate and correct the virtual element position errors. Both numerical simulations and real data experiments have shown the validity of the analyses as well as the effectiveness of the proposed calibration methods.

show abstract

Section: Introductionmentioning

confidence: 99%

Array error calibration methods in downward-looking linear-array three-dimensional synthetic aperture radar

Tan

Huang

Han

et al. 2016

J. Appl. Remote Sens

Self Cite

View full text Add to dashboard Cite

show abstract

“…The obtaining images can apply a new method for precise control and guide, navigation and landing and so on. Linear array antennas technology [2,3] can solve the special imaging problems of forward looking SAR [4] . FMCW radar [5] has the advantages of small size and lightweight with respect to traditional pulse radar.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Correction of the Doppler Frequency Shift of Airborne Forward Looking Array FMCW SAR

Zhang

Tan

Wang

et al. 2013

IET International Radar Conference 2013

View full text Add to dashboard Cite

Combined with Frequency-Modulated Continuous-Wave (FMCW) technology, airborne forward-looking array synthetic aperture radar (SAR) can obtain the image in front of the aircraft and also have the advantages of FMCW radar such as small size and lightweight. Moreover, it is suitable to be installed on platforms like helicopter and small unmanned aerial vehicle. It's valuable to study the imaging problem of airborne forward looking array SAR when aircraft platforms move toward the target areas in practice. This paper analyses the echo model based on geometry of forward looking array SAR and the Doppler frequency shift due to the movement of the aircraft platforms with a forward and downward velocity, studies a corresponding correction scheme and then presents an improved frequency scaling algorithm for forward looking array FMCW SAR. Finally, the algorithm is verified with the simulation and discussion.

show abstract

“…There are many imaging arithmetic applied to reconstruct the two dimensional image [1][2][3][4][5][6][7], and the back-projected (BP) algorithm with processing at time-domain is the most accurate method for rotator mode [3]. According to the idea of 2-D BP, if the rotator can be moved along azimuthal angle and pitch angle respectively, BP method can also be extended to image in three dimension, and accordingly its 3-D resolution can be achieved as other 3-D imaging arithmetic [8][9][10][11]. In this paper, the BP algorithm of three-dimension is analyzed in details.…”

Section: Introductionmentioning

confidence: 99%

A novel method of planar three dimensional synthetic aperture radar imaging

Zhou

Jia-dong

et al. 2012

2012 8th International Symposium on Communication Systems, Networks &Amp; Digital Signal Processing (CSNDSP)

View full text Add to dashboard Cite

A fully novel three-dimensional (3-D) microwave image reconstruction algorithm is presented, which based on echo data of stepped-frequency sweeping radar system. The algorithm is not restricted by far field as the traditional imaging algorithm. By synthetic aperture processing for radar data, the high resolution of the image can be achieved. The algorithm belong to a new three dimensional back-projected method, which can hold good accuracy of interpolation, 3-D image of target can be achieved through fast Fourier transform and integrating after interpolation. The imaging results from simulation and experiment were presented. These results show that the algorithm is correct, 3-D image reconstruction based on this back-projected method can provide a microwave 3-D image with high resolutions effectively.

show abstract

Synthetic aperture radar tomography sampling criteria and three-dimensional range migration algorithm with elevation digital spotlighting

Cited by 8 publications

References 15 publications

Array error calibration methods in downward-looking linear-array three-dimensional synthetic aperture radar

Array error calibration methods in downward-looking linear-array three-dimensional synthetic aperture radar

Analysis and Correction of the Doppler Frequency Shift of Airborne Forward Looking Array FMCW SAR

A novel method of planar three dimensional synthetic aperture radar imaging

Contact Info

Product

Resources

About