atmosisa - Use International Standard Atmosphere model

Syntax

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

Description

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

This function assumes that below the geopotential altitude of 0 km and above the geopotential altitude of the tropopause, temperature and pressure values are held.

Inputs

height

Array of m-by-1 geopotential heights, in meters.

Outputs

`T`	Array of `m` temperatures, in kelvin.
`a`	Array of `m` speeds of sound, in meters per second. The function calculates speed of sound using a perfect gas relationship.
`rho`	Array of `m` densities, in kilograms per meter cubed. The function calculates density using a perfect gas relationship.
`P`	Array of `m` pressures, in pascal.

Examples

Calculate the International Standard Atmosphere at 1000 m:

[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 m:

[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

References

U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C.