L-band PS Analysis: JERS-1 results and TerraSAR-L predictions

Details L-band PS Analysis: JERS-1 results and TerraSAR-L predictions L-band PS Analysis: JERS-1 results and TerraSAR-L predictions

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.550e..43d&link_type=abstract

Proceedings of the FRINGE 2003 Workshop (ESA SP-550). 1-5 December 2003, ESA/ESRIN, Frascati, Italy. Editor: H. Lacoste. Publish

Computer Science

Scientific paper

Long term interferometry with L band can be studied using data from the Japanese satellite JERS, that flew from 1992 to 1998. Notwithstanding problems like electromagnetic interference and limited information on the across track baselines, still the quality of the system makes the data very useful. This makes it possible the identification of Permanent Scatterers in urban and semi urban areas, with very high density (up to 150/km2 ) with coherence up to .9 in an interval of time of several years. In turn, this allows the better determination of the orbits, and allows a comparison with similar data from ERS 1. Namely, a similarity is found with data acquired during the 3 days repeat cycle. The longer wavelength therefore is seen to correspond to a longer decay time of the temporal coherence, thus explaining the high quality results obtained. The higher average coherence allows to combine the phase information of several adjacent points, and therefore to at least partially reduce the effects of the higher geometric dispersion of the differential interferometry outcomes due to the very same longer wavelength. In conclusion, while the technique appears too coarse for direct estimation of building motion, it appears very interesting for vegetated areas and for areas where the velocity of the motion would create alias in C band.

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