Sentinel-1 documents and publications

ESA's radar observatory mission for GMES operational services
ESA Special Publication (SP-1322/1), March 2012

GMES Sentinel-1 mission
R. Torres, P. Snoeij, D. Geudtner, D. Bibby, M. Davidson, E. Attema, P. Potin, B. Rommen, N. Floury, M. Brown, I. Navas Traver, P. Deghaye, B. Duesmann, B. Rosich, N. Miranda, C. Bruno, M. L'Abbate, R. Croci, A. Pietropaolo, M. Huchler, F. Rostan
Remote sensing of Environment, 2012

Sentinels for science: Potential of Sentinel-1, -2, and -3 missions for scientific observations of ocean, cryosphere, and land
Z. Malenovskýa, H. Rott, J. Cihlar, M. E. Schaepman, G. García-Santos, R. Fernandes, M. Berger
Remote Sensing of Environment, 2012

The radar mission for GMES operational land and sea services
ESA Bulletin 131, August 2007 

Sentinel-1 Mission Requirement Document
ESA, July 2005