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GNSS Signal Architect Toolbox
Customized MATLAB-based tools for GPS and GLONASS data analysis & signal processing

Signal Simulation Tool
The signal simulation tool simulates the effect of GPS and GLONASS satellite signals on a conventional receiver’s code and carrier tracking loops. The Toolbox’s signal processing simulation architecture includes a truth profile. This truth profile is used to generate the simulated signals as a function of the signal strength, pseudorange, Doppler, and Doppler-rate. The receiver profile defines the receiver being simulated and the parameters used by the receiver to process the signals. The state output from the simulated receiver models the output from an actual receiver experiencing the simulated conditions. The signal simulation tool can be used as an analysis aid to assist in test and evaluation of receivers beyond the capability of conventional RF signal simulators that do not provide low-level insight into the operation of a receiver. This insight can in turn be used to specify key parameters for receivers to optimize their performance in the presence of perturbed environments.

Geographical Tools
The Toolbox’s geographic tools facilitate the transformation of data between the various coordinate systems commonly used in GPS research, such as latitude-longitude-altitude, WGS-84 and PZ-90.02 Earth-Centered Earth-Fixed (ECEF), North East Down (NED), and body reference frames. These tools provide the user flexibility in data representation.

Satellite Geometry Tools
The Toolbox also provides tools to read GPS and GLONASS almanacs and ephemerides and compute ECEF and line-of sight vectors to the GNSS satellites as a function of user position and time. The tools can also compute dilution of precision (DOP) values and determine predicted satellite visibility.

Receiver Design and Analysis Tools
The receiver design and analysis tools model different receiver architectures and simulate different error scenarios. With these tools, a simulation can predict how a receiver will react in different environments, such as urban environments, environments susceptible to multi-path effects, and high-dynamic situations.

The signal simulation flow that is executed when generating a simulation profile is illustrated below. This can be used to generate simulated data sets for playback and analysis by the built-in receiver module within the MATLAB tools. The simulated GPS and GLONASS signals can also be played back into a receiver under test as live digital or RF signals using a GNU Radio compatible Softtware Defined Radio Platform.


Application Areas

  • GPS/GLONASS performance analysis, research and development, and system design
  • Data acquisition, analysis and modeling
  • GPS/GLONASS precision applications
  • Next-generation GPS/GLONASS signals in space modeling and simulation
  • Data recording and playback from real-time systems
Spectrum of Simulated Signal CA and P Code
Geographical Tools Display Example

GNSS Signal Architect Toolbox Flow Diagram:

Windows XP, Windows 7
MATLAB 5.0 or higher.

MathWorks Partner

Request a price quote for the Toolbox or any GNSS Signal Architect products.


For additional information on the GNSS Signal Architect Toolbox or other NAVSYS GNSS Signal Architect products, please contact:
Debbie Westra
NAVSYS Corporation
telephone: 866.462.8797 or 719.481.4289

Related Information


GNSS Signal Architect Simulator Software

Downloadable Papers


Simulating GPS Signals - It Doesn't Have to Be Expensive
GPS World, May 2012


Architecture and Performance Testing of a Software GPS Receiver for Space-based Applications
Proceedings of IEEEAC, Big Sky, MT, Mar. 2004


Advanced GPS Hybrid Simulator Architecture
Proceedings of ION 57th Annual Meeting 2001, Albuquerque, NM, June 2001


Modeling and Simulation of GPS Using Software Signal Generation and Digital Signal Reconstruction
Proceedings of ION Technical Meeting, Anaheim, CA, Jan. 2000


Applications of Digital Storage Receivers for Enhanced Signal Processing.
Proceedings of the ION GPS ‘99, Nashville, TN, Sept. 1999

Downloadable Brochure

GNSS Signal Architect Toolbox


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