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The [sin(x)/x](sinc) interpolation is commonly used in resampling SAR data centred around a point target to obtain the interpolated impulse response function to be analysed. Detected SAR data are output from a correlation processor in either amplitude or intensity format. In the former case the data can be squared before or after the interpolation, leading to a substantial difference in profile in the two procedures. After interpolation, squaring presents a better estimate of the side lobe peak values but an overestimate of the 3 dB width. Before interpolation squaring elevates side lobe contributions. In this paper the differences are explained by applying the sampling theorem, and the two methodologies compared against theoretical uninterpolated data.

Additional information

Authors: LAVALLE C, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Geoscience and Remote Sensing Symposium (INGARSS'92), Houston, Texas (US), May 26-29, 1992
Availability: Available from (1) as Paper EN 36736 ORA
Record Number: 199210967 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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