Aerospace Toolbox

atmosisa - Use International Standard Atmosphere model

Syntax

[T, a, P, rho] = atmosisa(h)

Description

[T, a, P, rho] = atmosisa(h) implements the mathematical representation of the International Standard Atmosphere values for ambient temperature, pressure, density, and speed of sound for the input geopotential altitude.

Input required by atmosisa is:

`h`	An array of `m` geopotential heights, in meters

Outputs calculated for the International Standard Atmosphere are:

`T`	An array of `m` temperatures, in kelvin
`a`	An array of `m` speeds of sound, in meters per second
`P`	An array of `m` air pressures, in pascal
`rho`	An array of `m` air densities, in kilograms per meter cubed

Examples

Calculate the International Standard Atmosphere at 1000 meters:

[T, a, P, rho] = atmosisa(1000)


T =

  281.6500


a =

  336.4341


P =

  8.9875e+004


rho =

    1.1116

Calculate the International Standard Atmosphere at 1000, 11,000, and 20,000 meters:

[T, a, P, rho] = atmosisa([1000 11000 20000])


T =

  281.6500  216.6500  216.6500


a =

  336.4341  295.0696  295.0696


P =

  1.0e+004 *

    8.9875    2.2632    0.5475


rho =

    1.1116    0.3639    0.0880

Assumptions and Limitations

Below the geopotential altitude of 0 km and above the geopotential altitude of the tropopause, temperature and pressure values are held. Density and speed of sound are calculated using a perfect gas relationship.

References