An open source software-defined Global Navigation Satellite Systems (GNSS) receiver written in C++ and based on the GNU Radio framework.


  • Multiplatform (Linux and Mac OS X, 32 and 64 bit architectures)
  • Multithreaded
  • Works with files and several RF front ends, including the Universal Hardware Driver (UHD)
  • Acquisition of GPS L1 C/A, Galileo E1B and E1C signals
  • SIMD-enabled for most popular processors
  • Implemented tracking loops: DLL + PLL, DLL + PLL/FLL, VEML
  • Connection to Matlab/Simulink via TCP for rapid prototyping and algorithm validation.
  • Demodulation of the navigation message GPS NAV and Galileo INAV
  • Computation of PVT (Position - Velocity - Time) solution in real-time
  • Position solution exportable to KML files (can be opened by Google Earth and other similar tools)
  • Generation of RINEX files (observables and navigation), v2.1 and v3

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User Reviews

  • The GNSS-SDR project is the first research-oriented open source Global Navigation Satellite Systems (GNSS) Software Defined Receiver (SDR). Join with us!

    3 users found this review helpful.
  • Scientific and industrial applications of GNSS signals and data usually require non-standard features of the receiver. Access to intermediate signals is not possible in mass-market receivers, and professional equipment is costly and often a 'black box' that does not offer exact information about how signals are being processed. Since all the processing is done in ASICs, one cannot change the implementation of a certain functional block and assess the impact in the whole receiver performance. We propose the implementation of an open-source GNSS software receiver freely available to the research community. This project provides a common platform for GNSS signal processing and data gathering for scientific applications, testing of algorithms, receiver design, and educational purposes. This tool is intended to foster collaboration, increase awareness, and reduce development costs in the field of GNSS receiver design and customized use of GNSS signals.

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Additional Project Details

Intended Audience

Aerospace, Science/Research, Education, Telecommunications Industry, Developers, Engineering

User Interface


Programming Language

Simulink, MATLAB, C++