Autofocus correction of phase distortion effects on SHARAD echoes

Bruce A. Campbell; Nathaniel E. Putzig; Lynn M. Carter; Roger J. Phillips

doi:10.1109/LGRS.2011.2143692

Autofocus correction of phase distortion effects on SHARAD echoes

Bruce A. Campbell, Nathaniel E. Putzig, Lynn M. Carter, Roger J. Phillips

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

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°, 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.

Original language	English (US)
Article number	5770180
Pages (from-to)	939-942
Number of pages	4
Journal	IEEE Geoscience and Remote Sensing Letters
Volume	8
Issue number	5
DOIs	https://doi.org/10.1109/LGRS.2011.2143692
State	Published - Sep 2011
Externally published	Yes

Keywords

Mars
radar signal processing
spaceborne radar

ASJC Scopus subject areas

Geotechnical Engineering and Engineering Geology
Electrical and Electronic Engineering

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10.1109/LGRS.2011.2143692

Cite this

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abstract = "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°, 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.",

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T1 - Autofocus correction of phase distortion effects on SHARAD echoes

AU - Campbell, Bruce A.

AU - Putzig, Nathaniel E.

AU - Carter, Lynn M.

AU - Phillips, Roger J.

PY - 2011/9

Y1 - 2011/9

N2 - 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°, 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.

AB - 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°, 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.

KW - Mars

KW - radar signal processing

KW - spaceborne radar

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Autofocus correction of phase distortion effects on SHARAD echoes

Abstract

Keywords

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