News Item

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 . .

  • 07 December 2013
  • R and D

Contact Us

The Royal Institute of Navigation
1 Kensington Gore

+44 (0)20 7591 3134

E-Mail Communication

The Royal Institute of Navigation periodically sends out email updates to its membership and those who have subscribed to events and conferences run by the RIN. In doing so, the RIN takes all reasonable precautions to ensure that the emails are only sent to those who have requested them, and that no third party can make unauthorised use of any email address to send out mailings.If you receive unsolicited mail from any address then please inform us at and we will take appropriate action.

Join the RIN

You can apply for any category of RIN membership by completing the online membership application form and paying using our secure credit/debit card payment system.

Join Now