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Verification and Validation of AGI Technology

Verification and Validation of AGI Technology

Because analytical fidelity is of the utmost importance for AGI products, our technology continues to undergo verification and validation to ensure accuracy, quality, performance, and reliability.

Testing Entity Product(s)/components(s) reviewed Date
Analytical Graphics, Inc. AGI Components is a family of class libraries that leverage the STK desktop product by using its algorithms and file formats and building off its analysis. The libraries are verified and validated against STK as the benchmark. AGI expects Components to achieve the same numerical accuracy as STK, and a large part of the test suite is dedicated to ensuring that. More than 3,000 individual tests are run on every build of components using NUnit as the framework. NCover informs the test group of any code that goes untested. If a feature cannot be tested with STK, other methods are used. For instance, AGI does limited testing against other data sources such as the Astronomical Almanac. Engineers also test for specific well-defined results and for edge cases (correct error handling, pathological cases, etc.) All told, AGI’s code coverage is more than 90% with the remaining 10% tending to be error handling. All AGI tests have built-in acceptance criteria on a pass-fail basis: AGI does not ship unless all tests pass. Ongoing
Analytical Graphics, Inc. This document extends the Independent Verification and Validation (IV&V) technical report prepared by the Aerospace Corporation, and shows that STK 9 meets or exceeds the benchmark specifications for STK 4. This document is limited to tests of the High Precision Orbit Propagator (HPOP) and parameter and coordinate-frame transformations, using test cases commensurate with those published in the original Aerospace Corporation IV&V report. The software settings that provide maximum compatibility with STK 4 as originally used with Aerospace Corporation’s baseline tools are also discussed. The results show that, using these software settings, the differences in results between STK 4 and STK 9 remain at or below the suitability criteria used for STK 4 against Aerospace Corporation benchmarks. . 2009
University of Colorado The University of Colorado has produced evaluations of the effectiveness of ODTK for performing orbit determination based on GPS measurements. Four reports have been completed to date covering the use of pseudo-range and carrier phase measurements inclusive of satellite attitude modeling and the use of navigation solutions as measurements in ODTK versions 1.1, 2.0, 3.0 and 4.0. 2007 (v4.0) 2004 (v3.0) 2004 (v2.0) 2003-04 (v1.1)
Sensis Corporation Sensis Corporation performed a Validation and Verification of AGI's aircraft flight-path modeling tool, Aircraft Mission Modeler, by comparing a flight trajectory created within STK to an externally generated trajectory model. According to Sensis, "The Aircraft Mission Modeler in STK provides the capability to accurately represent the flight trajectory of any aircraft based on user-provided flight paths." Read more. 2006
Center for Space Standards & Innovation (CSSI) CSSI analyzed state vector propagation using differing flight dynamics programs:
GEODYN (Goddard, NASA, NRL, other)
GTDS (Goddard Trajectory Determination System, MIT)
HPOP (Analytical Graphics Inc., Satellite Tool Kit)
SPECIAL-K (Navy)
TRACE (Raytheon/Geodynamics)		 2005
John Draim, Aerospace Consultant In his paper "Satellite Constellations," presented at the 55th International Astronautical Congress, Draim compares STK to six other satellite orbit and constellation development tools. He calls it "without a doubt the most advanced commercially available and reasonably priced computer product available to the satellite constellation designer. Draim generated all analytical figures for his paper using the freeware version of STK. 2004
NASA Goddard The WMAP mission to the L2 libration point used STK/Astrogator for trajectory design, including calculating the launch windows, designing the phasing loops, targeting orbit insertion, operational maneuver planning, engine calibration, and contingency planning. 2002
The Aerospace Corporation The Aerospace Corporation performed an independent Verification & Validation of STK functions: high-precision orbit propagation, orbital parameter and coordinate-frame transformations, and access and visibility calculations. 2000
     

For more information or to request a copy of one of our published reports, please e-mail vv@agi.com.

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