Galileo software receiver demo
A software-defined radio (SDR) has obtained Galileo-only, real-time position fixes from the 4 Galileo satellites already in orbit.
An antenna and front-end receiver fed raw data to the GNSS-SDR, which was held in an Intel Core 2 Quad CPU PC.
As only 4 Galileo satellites are operational, the receiver had to wait until all 4 were visible to obtain a fix. The 4 satellites gave a Dilution of Precision (DOP) with horizontal and vertical values of 3.6 and 4.2 respectively.
The software computed position, velocity and time (PVT) by a simple least-squares algorithm, without any external assistance. The results were impressive, with Circular Error Probability (CEP) of 1.9 m and a Distance Root Mean Square (DRMS) precision of 2.5 m. In 3-dimensions, the Mean Radial Spherical Error (MRSE) was 3.4 m.
GNSS-SDR is a project hosted and sponsored by the Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), a non-profit research foundation near Barcelona. The software is a by-product of GNSS research conducted at the Communications Systems Division of CTTC, and is the combined effort of many students, software engineers and researchers from different institutions.
The software is freely obtainable from the link below . .