A Matlab-based high-sensitivity GNSS (HS-GNSS) software receiver has been succesfully completed by SPCOMNAV. The receiver is fully compatible with GPS-L1/L5 and Galileo-E1/E5a signals, and it makes use of advanced signal processing techniques for enabling operation in harsh indoor environments. The software receiver has been developed within the framework of the ESA funded DINGPOS project, which aims at developing a R+D platform for indoor positioning based on the hybridization of GNSS with inertial sensors and communication systems. The DINGPOS consortium is composed by GMV Aerospace and Defence as prime contractor, Thales Alenia Space France, Advanced Digital Institute, Nemerix and Skysoft.