| Aerospace Blockset | |
Implement the 1976 COESA lower atmosphere
Library
Description
The COESA Atmosphere Model block implements the mathematical representation of the 1976 COESA (Committee on Extension to the Standard Atmosphere) United States (U.S.) standard lower atmospheric values for absolute temperature, pressure, density, and speed of sound for the input geopotential altitude.
Below 32000 m (approximately 104987 ft), the U.S. Standard Atmosphere is identical with the Standard Atmosphere of the International Civil Aviation Organization (ICAO).
The COESA Atmosphere Model block icon displays the input and output units selected from the Units pop-up menu.
Dialog Box
| Height |
Temperature |
Speed of Sound |
Air Density |
|
Metric |
Meters |
Degrees Kelvin |
Meters per second |
Kilograms per cubic meter |
English |
Feet |
Degrees Rankine |
Feet per second |
Pound mass per cubic foot |
Inputs and Outputs
The input is geopotential height.
The four outputs are temperature, speed of sound, air pressure, and air density.
Assumptions and Limitations
Below the geopotential altitude of 0 m (0 ft) and above the geopotential altitude of 84852 m (approximately 278386 ft), temperature values are extrapolated linearly and pressure values are extrapolated logarithmically. Density and speed of sound are calculated using a perfect gas relationship.
References
[1] U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C.
See Also
ISA Atmosphere Model
| | Angular Velocity Conversion | Density Conversion | |
