Compression of SAR data through range focusing and variable-rate vector quantization

Author

Poggi, Giovanni ; Ragozini, Arturo R P ; Verdoliva, Luisa

Author_Institution

Dipartimento di Ingegneria Elettronica e dell Telecomunicazioni, Naples Univ., Italy

Volume

38

Issue

3

fYear

2000

fDate

5/1/2000 12:00:00 AM

Firstpage

1282

Lastpage

1289

Abstract

In spaceborne SAR systems, some form of data compression is required to reduce the bandwidth of the downlink channel. Compressing the raw data is very inefficient because such data exhibit little or no correlation. Data focusing would restore the original dependencies of the image, but it is too complex to be implemented onboard. In this paper we propose to carry out a partial, low-complexity focusing onboard, and then compress the resulting data by means of a suitable algorithm based on variable-rate adaptive vector quantization. Experiments show a performance improvement of 0.5-0.7 dB over compression techniques proposed in the literature

Keywords

geophysical signal processing; image coding; remote sensing by radar; spaceborne radar; synthetic aperture radar; vector quantisation; 0.5 to 0.7 dB; SAR data; bandwidth; compression techniques; data compression; downlink channel; partial low-complexity focusing; range focusing; spaceborne SAR; variable-rate adaptive vector quantization; variable-rate vector quantization; Bandwidth; Channel capacity; Data compression; Downlink; Encoding; Focusing; Image coding; Image restoration; Pixel; Vector quantization;

fLanguage

English

Journal_Title

Geoscience and Remote Sensing, IEEE Transactions on

Publisher

ieee

ISSN

0196-2892

Type

jour

DOI

10.1109/36.843020

Filename

843020