Performance of Interpulse Signal Coding in Interleaved-Pulse Polarimetric SAR
Article first published online: 12 SEP 2008
Copyright © 1993 John Wiley & Sons, Ltd.
European Transactions on Telecommunications
Volume 4, Issue 5, pages 555–567, September 1993
How to Cite
Giuli, D. and Facheris, L. (1993), Performance of Interpulse Signal Coding in Interleaved-Pulse Polarimetric SAR. Eur. Trans. Telecomm., 4: 555–567. doi: 10.1002/ett.4460040510
- Issue published online: 12 SEP 2008
- Article first published online: 12 SEP 2008
- Manuscript Received: 23 FEB 1993
- ESTEC (ESA). Grant Number: 101503
- Italian Ministry of Research and University
Fully polarimetric Synthetic Aperture Radars (SAR) provide a complete measurement of the scattering matrix of the imaged target by alternately transmitting two pulses at orthogonal polarizations, while processing echoes simultaneously received on two orthogonal polarization channels. Due to this procedure of performing measurements, the problem of interference caused by range ambiguities is of greater concern than in conventional non-polarimetric SAR. Such interference is made up by signals of different nature, depending on the order (even or odd) of the range ambiguity. In particular, odd-order range ambiguities generate an interference on crosspolar terms of the matrix, proportional to one of the copolar terms, which have typically a much greater magnitude. This drawback, that never occurs in non-polarimetric SAR systems, is a major source of measurement contamination, in particular in the presence of range ambiguous echoes from areas which are illuminated at low incidence angles.
In this paper, after discussing the influence of range ambiguities on the accuracy of scattering matrix measurement as performed by interleaved-pulse SAR, we examine the utility of appropriate interpulse phase coding strategies, to be devised and utilized with the purpose to reduce the interference due to range ambiguities and affecting those target scattering matrix elements, whose measurement is expected to be most critical.