Aerospace Blockset 3.4

Fine-Tuning the Model

Aerospace Blockset™ software includes block libraries that standardize units, transform axes representations and coordinate systems, and perform common math operations.

The Unit Conversions library provides blocks for converting typical physical property units, such as acceleration, density, and temperature, between metric and English units.

The Axes Transformations library includes blocks for converting spatial representations between Euler angles and quaternion vectors and for creating direction cosine matrices. The Euler angles can be in any of the twelve standard rotation sequences. The direction cosine (rotation) matrix transfers between coordinate systems such as body and inertial; body and wind; ECEF and north-east-down (NED); and ECEF and latitude, longitude, and altitude (LLA). Other representations include geocentric and geodetic latitude.

ECEF-to-LLA block, which lets you switch between planet models using Simulink dialog boxes. Click on image to see enlarged view.

The Math Operations library provides blocks for calculating the cross product, creating and inverting 3 × 3 matrices, and calculating the determinant and adjoint of a 3 × 3 matrix. Quaternion math operations, such as the conjugate, division, inverse, and modulus, are also included.