Constellation Toolbox

A comprehensive simulation and analysis package for satellite constellations


  • Provides GPS error models including SA, troposphere, ionosphere, and receiver
  • Provides GPS navigation simulations, including attitude visibility restrictions
  • Has DGPS capabilities for navigation and component error analysis
  • Models complex or arbitrary antennae patterns
  • Is highly vectorized for maximum execution speed


Constellation Toolbox is a set of MATLAB ® based utilities for the analysis and simulation of satellite constellations, including GPS, GLONASS, and user-defined constellations. Basic constellation visibility and interference problems are modeled. The toolbox provides GPS specific error models for Selective Availability, atmospheric delays, receiver errors, and GPS satellite errors. Also included is DGPS modeling capability. Simulated GPS data includes eudorange, carrier phase, and Doppler measurements which are used to obtain navigation solutions. Graphical output is provided with specialized functions for plotting data for satellite constellations. For quick implementation by users, a robust set of example programs solve many problems with only minor modifications.

Advanced modeling features include an oblate Earth formulation for Earth blockage for inter-constellation and intra-constellation analysis. It is easy to update GPS and GLONASS constellation information using YUMA formatted almanacs. Utilities are provided for saving user constellation information in the same YUMA format. The toolbox lets users generate, save, and load scenario data. All of the functions have integrated input and output variables and are highly vectorized.

Constell Inc.

PO Box 433
Philomont, VA 20131
Tel: 540-338-0289
Fax: 540-338-0293

Required Products


  • Macintosh
  • UNIX
  • Windows


  • Consulting
  • E-mail
  • Fax
  • On-site assistance
  • System integration
  • Telephone
  • Training

Product Type

  • Data Analysis Tools


  • GPS, Mapping and Navigation
  • Constellation design


  • Aerospace and Defense
  • Earth, Ocean, and Atmospheric Sciences