Skip to content
Switch branches/tags

Latest commit


Git stats


Failed to load latest commit information.

Tracker Component Library Release 5.1, November 2021

A paper describing a number of features of the library is
D. F. Crouse, "The Tracker Component Library: Free Routines for Rapid Prototyping," IEEE Aerospace and Electronic Systems Magazine, vol. 32, no. 5, pp. 18-27, May. 2017.

These are the release notes for the version 5.1 of the Tracker Component Library. The Tracker Component Library is a collection of Matlab routines for simulating and tracking targets in various scenarios. Due to the complexity of the target tracking problem, a great many routines can find use in other areas including combinatorics, astronomy, and statistics.

Making this code available and open source is in the spirit of OMB M-16-21, which can be viewed online at:

Those looking for magnetic field synthesis code might want to look at ./Sample Code/Magnetic Models/ .

As of version 3.0, the library has been split into two parts. This is the publicly available part. Many functions have been placed into a supplement that is only available to the U.S. Government Agencies and their contractors. Until 31 January 2021, the limited distribution supplement can be downloaded by authorized individuals from at: After 31 January 2022, di2e will no longer support projects like this and as of the time of this release, no suitable replacement repository for the limited distribution version of the Tracker Component Library has been found.

Those looking to get a quick idea of a very simple end-to-end tracking algorithm (track initiation, data association, maintenance, and termination) might want to look at ./Sample Code/Basic Tracking Examples/demo2DIntegratedDataAssociation.m to see an example of a complete GNN-JIPDAF tracker run on a simple 2D tracking scenario, which can be easily transformed into a normal JIPDAF by changing a single parameter. The tracker is made from the modular components of the library. A lot of other sample code is also provided to demonstrate the use of other parts of the library.

To use the full library, add the library and all of its subfolders to your active path in Matlab. Some functions are available as C/C++ files for use in Matlab either because they use third-party libraries (and must be compiled to be used) or because the native Matlab implementations provided are too slow in certain circumstances. These files can be compiled by running the CompileCLibraries function. Precompiled code is not distributed with the library. Note that a C/C++ compiler supported by Matlab must be installed. See below for comments regarding compilation.


  • Bug fixes.
  • New interpolation functions, such as biquadraticInterp, quadraticInterpGrid, quadraticInterpUnif3PtMinMax, cubSplineInterpSimp and others.
  • Various barycentric coordinate systems. These can be used for interpolation between nonuniformly samples points. These include pt2WachspressCoords, pt2MeanValCoords, pt2WachspressCoords3D, and others.
  • More basic geometric functions such as sortTriangFacesAroundVertices, getPolygonNormals, triangleArea, clipLine2ConvexPolygon, and angleBetweenLineAndPlane.
  • Functions for evaluating reflection coefficients
  • Bivariate and trivariate normal CDFs in bivarNormCDF and trivarNormCDF.
  • More functions related to the complexity of assignment problems including num2DTarMeasHypsWithGating and numJPDAStarTarMeasHyps.
  • Osculating sphere coordinate conversions in osculatingCoords2Ellipse and ellips2OsculatingCoords.
  • Additional coordinate system conversions including for cameras in cameraCoords2UVCoords, cameraCoord2UVCoordsCubature and uvCoords2CameraCoords.
  • A function to make a constant speed non-maneuvering trajectory over a curved Earth in makeConstSpeedLevelCurvedEarthTraj.
  • The line of sight related functions lineOfSightHitsEarth and lineOfSightMinDist2Earth.


The compilation of the library has been tested under Matlab2021a under Windows 10 using minGW64 and Microsoft Visual C++ 2019. The code will probably compiler under Mac OS X and Linux. Precompiled code is not distributed with the library.


Almost all of the function in the library work without any external resources. However, the folder ./Mathematical_Functions/Polynomials/Generic_Multivariate_Polynomials/ contains the function solvePolySysWithExtProg. This is an interface to external solvers for simultaneous multivariate polynomial systems. The solvers are external programs and are not included. Though the functions polyRootsMultiDim and solveQuadBivarEq can solver certain types of simultaneous multivariate polynomials, they are limited. For more general systems, an external solver is the best choice. The functions polyMeasConvert, polyMeasConvertAsync, and DopplerOnlyInit6D are located in subfolders entitled 'Uses_External_Solver" and use the function solvePolySysWithExtProg. Supported external solvers for the function solvePolySysWithExtProg are PHCpack, Bertini, and the certified solver in Macaulay2. Note that Macaulay2 tends to fail more often than the other solvers.

The solvers can be downloaded from: PHCpack for Mac OS X, Windows and Linux: Bertini (version 1.5) for Mac OS X and Linux and Windows, only with Cygwin: Macaulay2 for Mac OS X, Linux, and Windows:

For the external solvers to work, they need to be added to the search path used in Matlab so that the phs/bertini/m2 commands can be called using the system command in Matlab.


If the library was downloaded without associated data files for solar system ephemerides as well as magnetic, gravitational and terrain models, then the relevant data files will have to be downloaded The original sources of the data are:

  1. Earth2014 terrain model: The files Earth2014.BED2014.degree2160.bshc, Earth2014.ICE2014.degree2160.bshc, Earth2014.RET2014.degree2160.bshc, Earth2014.SUR2014.degree2160.bshc, Earth2014.TBI2014.degree2160.bshc should be placed into ./Terrain/data . Though data files to degree and order 10,800 are also available, they are not currently supported as the function spherHarmonicEval does not use extended precision arithmetic, which is required to avoid overflows when using the model.

  2. EGM2008 terrain model (The DTM2006.0 model): The file Coeff_Height_and_Depth_to2190_DTM2006.0 should be placed into ./Terrain/data . The first time using the getEGM2008TerrainCoeffs function will be significantly slower than subsequent calls, assuming the full model is loaded the first time.

  3. The EMM2017 magnetic field coefficients: The coefficients are included with the software that is provided. The files having names like EMM2015.COF and EMM2000.COF should all be zipped into an archive with the name and placed in ./Magnetism/data . The files with names like EMM2015SV.COF andEMM2000SV.COF should all be zipped into an archive with the name and placed into ./Magnetism/data . If all of the data for a single year is loaded, then a .mat file containing the data is placed in the data folder to speed up subsequent calls to the function.

  4. The IGRF13 magnetic field coefficients: The file can be downloaded and placed into the folder ./Magnetism/data .

  5. The WMM2020 magnetic field coefficients: The coefficient file shown be downloaded, unzipped and the file WMM.COF placed into ./Magnetism/data .

  6. EGM2008 gravitational coefficients Download the file EGM2008_to2190_TideFree.gz, which is under "EGM2008 Tide Free Spherical Harmonic Coefficients". Decompress the file and place it in ./Gravity/data .

  7. EGM96 gravitational coefficients The file egm96.z should be downloaded and decompressed, resulting in a file names egm96 without an extension, which should be placed in ./Gravity/data .

  8. EGM2008 parameters needed to convert height anomalies to geoid undulations: The "Correction Model" file Zeta-to-N_to2160_egm2008.gz should be downloaded, ungzipped and placed in ./Gravity/data .

  9. EGM96 parameters needed to convert height anomalies to geoid undulations: The file corrcoef.z should be decompressed and placed in ./Gravity/data .

  10. NASA JPL's DE430t planetary/solar/lunar ephemerides The file linux_p1550p2650.430t should be downloaded and placed in ./Astronomical Code/data for use by the readJPLEphem function. The readJPLEphem function can read other NASA ephemerides, but the DE430t set are the default.

  11. NASA JPL's GL0900C gravitational model of the Moon Download the file and place it in ./Gravity/data .

  12. The FES2004 tide model of the effects of ocean Earth tides. The file fes2004_Cnm-Snm.dat should be downloaded and placed in ./Gravity/Tides/data .

  13. The Hipparcos 2 Star Catalog Place the file hip2.dat in ./Astronomical Code/data .

  14. A low-resolution image of the "Blue Marble" Earth from NASA with land, ocean color, sea ice and clouds. Place the file in Misc/data . This is used as the default map to show on the Earth given by the plotMapOnEllipsoid function.

November 2021 David F. Crouse, Naval Research Laboratory, Washington D.C.


The source code is in the public domain and not licensed or under copyright. The information and software may be used freely by the public. As required by 17 U.S.C. 403, third parties producing copyrighted works consisting predominantly of the material produced by U.S. government agencies must provide notice with such work(s) identifying the U.S. Government material incorporated and stating that such material is not subject to copyright protection.

Derived works shall not identify themselves in a manner that implies an endorsement by or an affiliation with the Naval Research Laboratory.



This is a collection of Matlab functions that are useful in the development of target tracking algorithms.







No packages published