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| Titel: |
Autocorrelation function of non-Gaussian speckle in synthetic aperture radar images of dynamic sea surfaces |
| Auteur: |
Ouchi, K. Burge, R. E. |
| Verschenen in: |
International journal of remote sensing |
| Paginering: | Jaargang 12 (1991) nr. 2 pagina's 315-327 |
| Jaar: |
1991-02-01 |
| Inhoud: |
This paper presents a detailed theory on the statistical properties of non-Gaussian speckle in the synthetic aperture radar (SAR) images of dynamic sea surfaces, where breaking or near-breaking waves are present. The backscattered complex field is modelled as the sum of two independent fields: one arises from breaking waves which occur discretely and therefore the amplitude fluctuations are also discrete and the other represents the weak background field of a uniform amplitude due to non-breaking sea waves and/or system noise. The elementary scatterers are considered to be either in random or uniform motions and the magnitude of the motion is considered to be much greater for breaking waves than the background non-breaking waves. This compound backscattered field is then imaged by a SAR, resulting in a non-Gaussian speckle pattern which appears as the pronounced azimuth streaks. A general and simple expression is derived for the autocorrelation function (ACF) of the speckle intensity in terms of the statistical properties of the spatial backscattered field and the impulse response degraded by the scatterers' motions. The ACF is evaluated and discussed for a Gaussian impulse response and for different scatters' motions. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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