Autofocus Correction of Phase Distortion Effects on SHARAD Echoes

被引：38

作者：

Campbell, Bruce A. ^{[1
]}

Putzig, Nathaniel E. ^{[2
]}

Carter, Lynn M. ^{[3
]}

Phillips, Roger J. ^{[2
]}

机构：

[1] Smithsonian Inst, Ctr Earth & Planetary Studies, Washington, DC 20013 USA

[2] SW Res Inst, Boulder, CO 80302 USA

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20706 USA

来源：

IEEE GEOSCIENCE AND REMOTE SENSING LETTERS | 2011年 / 8卷 / 05期

关键词：

Mars; radar signal processing; spaceborne radar; MAGNETIC-FIELD; MARS;

D O I：

10.1109/LGRS.2011.2143692

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

SHARAD is a frequency-modulated (15-25 MHz) radar sounder that probes the upper few kilometers of the Martian crust and polar layered deposits. At solar zenith angles less than about 100 degrees, the ionosphere of Mars can induce phase distortion in surface and subsurface radar echoes that substantially degrades the signal-to-noise ratio and vertical resolution of the range-compressed data. We present a range-compression autofocus approach that estimates the phase distortion of SHARAD data along ground-track segments of about 100 km, using a power-law image-sharpness metric and an empirically derived scaling between the phase correction and radar frequency. This method is rapid, yields a greatly improved subsurface image, and provides a means to track regional and temporal changes in the Martian ionosphere.

引用

页码：939 / 942

页数：4

共 23 条

[1] Magnetic field of Mars:: Summary of results from the aerobraking and mapping orbits [J].

Acuña, MH ;

Connerney, JEP ;

Wasilewski, P ;

Lin, RP ;

Mitchell, D ;

Anderson, KA ;

Carlson, CW ;

McFadden, J ;

Rème, HR ;

Mazelle, C ;

Vignes, D ;

Bauer, SJ ;

Cloutier, P ;

Ness, NF .

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2001, 106 (E10) :23403-23417

[2]

Biccari D, 2001, INT GEOSCI REMOTE SE, P2557, DOI 10.1109/IGARSS.2001.978087

[3] SHARAD radar sounding of the Vastitas Borealis Formation in Amazonis Planitia [J].

Campbell, Bruce ;

Carter, Lynn ;

Phillips, Roger ;

Plaut, Jeffrey ;

Putzig, Nathaniel ;

Safaeinili, Ali ;

Seu, Roberto ;

Biccari, Daniela ;

Egan, Anthony ;

Orosei, Roberto .

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 2008, 113 (E12)

[4] Dielectric properties of lava flows west of Ascraeus Mons, Mars [J].

Carter, Lynn M. ;

Campbell, Bruce A. ;

Holt, John W. ;

Phillips, Roger J. ;

Putzig, Nathaniel E. ;

Mattei, Stefania ;

Seu, Roberto ;

Okubo, Chris H. ;

Egan, Anthony F. .

GEOPHYSICAL RESEARCH LETTERS, 2009, 36

[5] Shallow radar (SHARAD) sounding observations of the Medusae Fossae Formation, Mars [J].

Carter, Lynn M. ;

Campbell, Bruce A. ;

Watters, Thomas R. ;

Phillips, Roger J. ;

Putzig, Nathaniel E. ;

Safaeinili, Ali ;

Plaut, Jeffrey J. ;

Okubo, Chris H. ;

Egan, Anthony F. ;

Seu, Roberto ;

Biccari, Daniela ;

Orosei, Roberto .

ICARUS, 2009, 199 (02) :295-302

[6]

Chapman S., 1931, Proc. Phys. Soc., V43, P1047

[7] Magnetically controlled structures in the ionosphere of Mars [J].

Duru, F. ;

Gurnett, D. A. ;

Averkamp, T. F. ;

Kirchner, D. L. ;

Huff, R. L. ;

Persoon, A. M. ;

Plaut, J. J. ;

Picardi, G. .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2006, 111 (A12)

[8] Aberration correction by maximizing generalized sharpness metrics [J].

Fienup, JR ;

Miller, JJ .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 2003, 20 (04) :609-620

[9] Synthetic-aperture radar autofocus by maximizing sharpness [J].

Fienup, JR .

OPTICS LETTERS, 2000, 25 (04) :221-223

[10] Localized ionization patches in the nighttime ionosphere of Mars and their electrodynamic consequences [J].

Fillingim, M. O. ;

Peticolas, L. M. ;

Lillis, R. J. ;

Brain, D. A. ;

Halekas, J. S. ;

Lummerzheim, D. ;

Bougher, S. W. .

ICARUS, 2010, 206 (01) :112-119

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