Estimating the Doppler centroid of SAR data

Madsen, S.N.

doi:10.1109/7.18675

Cited by 294 publications

(148 citation statements)

References 7 publications

(1 reference statement)

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“…The clutter-lock technique (Li at al., 1985;Madsen, 1989) is usually used to avoid radiometric errors in SAR images. According to the clutter lock technique, the azimuth reference functions are built adaptively so that the synthetic beams track the direction of the real antenna beam staying within the main lobe of the real antenna pattern as shown in Fig.…”

Section: Radiometric Errors In Sar Imagesmentioning

confidence: 99%

Synthetic Aperture Radar Systems for Small Aircrafts: Data Processing Approaches

Bezvesilniy¹,

Vavriv²

2012

Recent Advances in Aircraft Technology

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Section: Radiometric Errors In Sar Imagesmentioning

confidence: 99%

Synthetic Aperture Radar Systems for Small Aircrafts: Data Processing Approaches

Bezvesilniy¹,

Vavriv²

2012

Recent Advances in Aircraft Technology

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“…Assume that for . Given the sample vector of size , the unbiased sample covariances are given by (17) tr (18) where , tr denotes the trace operator, and is a null matrix, except for the th diagonal, where its entries are set to . Since the number of sample covariances needed to determine the SM is moderate (typically smaller than 10), estimates can be computed directly with approximately complex floating-point operations.…”

Section: Sample Covariance-based Estimatementioning

confidence: 99%

Nonparametric estimation of mean Doppler and spectral width

Dias

Leitao

2000

IEEE Trans. Geosci. Remote Sensing

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Abstract-This paper proposes a new nonparametric method for estimation of spectral moments of a zero-mean Gaussian process immersed in additive white Gaussian noise. Although the technique is valid for any order moment, particular attention is given to the mean Doppler (first moment) and to the spectral width (square root of the centered second-spectral moment). By assuming that the power spectral density (PSD) of the underlying process is bandlimited, the maximum-likelihood estimates of its spectral moments are derived. A suboptimal estimate based on the sample covariance is also studied. Both methods are robust in the sense that they do not rely on any assumption concerning the PSD (besides being bandlimited). Under weak conditions, the set of estimates based on sample covariance is unbiased and strongly consistent. Compared with the classical pulse pair and the periodogram-based estimators, the proposed methods exhibit better statistical properties for asymmetric spectra and/or spectra with large spectral widths, while involving a computational burden of the same order.

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“…Hardware to perform the similar compensation on signals from squinted antennas is under development. The resulting Doppler centroid is monitored by a subsystem based on the sign-Doppler estimation method [18] to verify the antenna pointing and phase correction. The first-order motion compensation is completely removed again before the off-line processing.…”

Section: Subsystemsmentioning

confidence: 99%

EMISAR: an absolutely calibrated polarimetric L- and C-band SAR

Christensen

Skou

Dall

et al. 1998

IEEE Trans. Geosci. Remote Sensing

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101

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Abstract-EMISAR is a high-resolution (2 2 2 2 2 m), fully polarimetric, dual-frequency (L-and C-band) synthetic aperture radar (SAR) system designed for remote-sensing applications. The SAR is operated at high altitudes on a Gulfstream G-3 jet aircraft. The system is very well calibrated and has low sidelobes and low cross-polar contamination. Digital technology has been utilized to realize a flexible and highly stable radar with variable resolution, swath width, and imaging geometry. Thermal control and several calibration loops have been built into the system to ensure system stability and absolute calibration. Accurately measured antenna gains and radiation patterns are included in the calibration. The processing system is developed to support data calibration, which is the key to most of the current applications. Recent interferometric enhancements are important for many scientific applications.

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Estimating the Doppler centroid of SAR data

Cited by 294 publications

References 7 publications

Synthetic Aperture Radar Systems for Small Aircrafts: Data Processing Approaches

Synthetic Aperture Radar Systems for Small Aircrafts: Data Processing Approaches

Nonparametric estimation of mean Doppler and spectral width

EMISAR: an absolutely calibrated polarimetric L- and C-band SAR

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