Aerospace Blockset

Incorporating Environmental Conditions

Aerospace Blockset software provides standards-based reference models that you can use in your simulation.

The Environment library includes standards-based references for modeling atmosphere, gravity, geoid height, magnetic field, and wind.

The Atmosphere library provides blocks that implement mathematical representations from the 1976 Committee on Extension to the Standard Atmosphere (COESA), International Standard Atmosphere (ISA), and nonstandard day models from U.S. military specifications (MIL-HDBK-310 and MILSTD-210C).

Additional Atmosphere library blocks implement mathematical representations from these models: 2001 United States Naval Research Laboratory Mass Spectrometer and Incoherent Scatter Radar Exosphere (NRLMSISE) and 1986 Committee on Space Research (COSPAR) International Reference Atmosphere (CIRA). The NRLMSISE model provides atmospheric temperatures and densities at altitudes from 0 to 1,000 kilometers for a specified location and time. The CIRA model provides mean climatic data for atmospheric temperature, zonal wind, and either geopotential height or pressure for altitudes from 0 to 120 kilometers.

The Gravity library includes these models: 1984 World Geodetic System, 1996 Earth Geopotential Model (EGM96), and the 2000 and 2005 versions of the World Magnetic Model (WMM). The EGM96 Geoid block provides the geoid height at a specified location using the EGM96 geopotential model. The WMM blocks use the mathematical representation of the National Imagery and Mapping Agency (NIMA) standard and calculate the horizontal intensity, declination, inclination, total intensity, and vector of the Earth's magnetic field at a specified location and time.

Menu for the World Magnetic Model 2005, one of the reference models included in the Environment library.
Menu for the World Magnetic Model 2005, one of the reference models included in the Environment library.

The Wind library provides mathematical representations from MIL-F-8785C and MIL-HDBK-1797 to calculate wind shear and generate discrete wind gusts and Dryden and Von Kármán turbulence, as well as a horizontal wind block to simulate background wind. These blocks offer various combinations of angular rate signs (q, r), as defined in versions of the military specifications.

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