Title :
On-board compression of SAR data through range focusing
Author :
Poggi, Giovanni ; Ragozini, Arturo R P ; Verdoliva, Luisa
Author_Institution :
Dipt. di Ingegneria Elettronica e delle Telecommun., Naples Univ., Italy
Abstract :
To reduce the bandwidth of the downlink channel in spaceborne SAR systems some form of data compression is required. Compressing the raw data is very inefficient because these data exhibit little or no correlation; on the other hand, data focusing is too demanding to be carried out on-board. The authors propose to carry out a partial, low-complexity focusing on-board, in order to recover part of the original dependencies, and then to compress the resulting data by means of a variable-rate adaptive vector quantization algorithm. Experiments show a performance improvement of 0.5-0.7 dB over comparable compression techniques
Keywords :
adaptive signal processing; data compression; geophysical signal processing; geophysical techniques; radar imaging; radar signal processing; remote sensing by radar; spaceborne radar; synthetic aperture radar; terrain mapping; vector quantisation; SAR; adaptive vector quantization algorithm; data compression; geophysical measurement technique; image compression; image processing; land surface; low-complexity focusing; on-board method; radar imaging; radar remote sensing; radar signal processing; range focusing; spaceborne radar; synthetic aperture radar; terrain mapping; Channel capacity; Encoding; Fluctuations; Focusing; Image coding; Image storage; Noise robustness; Rate-distortion; Telecommunications; Vector quantization;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
DOI :
10.1109/IGARSS.1999.775091
