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2.9 | 10 ratings Rate this file 21 Downloads (last 30 days) File Size: 2.29 KB File ID: #8799

Standard Atmosphere Calculator

23 Oct 2005 (Updated 09 May 2006)

Calculates pressure, density, temperature, and speed of sound as a function of height.

File Information
Description	Using the 1976 US standard atmosphere model, this function returns pressure, denisity, temperature, and speed of sound at a given altitude. Works for both English and metric units.
Acknowledgements	This submission has inspired the following: Complete 1976 Standard Atmosphere, STDATMO: Standard Atmosphere Function
MATLAB release	MATLAB 6.5 (R13)
Other requirements	Cheesecake

Tags for This File
Everyone's Tags	aerodef, aeronautics, aerospace, altitude, atmosphere, density, pressure, standard, temperature
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Comments and Ratings (11)
15 Feb 2006	matt b	Needed to modify it to work with my version of matlab, [mat] = atmosphere(...) ... mat = [t, p,rho,a]
28 Mar 2006	Ramji Srimurugan
29 Mar 2006	Denis Fefelov
28 Apr 2006	Lance Locey
06 May 2006	Eric Wendel	Also, I think line 112 should read: "[TNew, PNew, RhoNew] = Gradient(H5, H6, TNew, PNew, RhoNew, L6)" It would also be very helpful if the input were allowed to be a vector.
21 Dec 2006	Tom Terrell	Careful on the accuracy of this program, it is based on an obsolete atmosphere model
11 Jan 2007	Brent Lewis	Only covers less than 10% of the 1976 Standard Atmosphere(what is that half a star :) ). Might try the COMPLETE 1976 standard atmosphere. See ya in class(or the bar) Rich
17 Jan 2007	Caleb Weitz	Very rough values for constants and sloppy coding. Think about recoding.
21 Aug 2007	Richard Rieber	I have no plans about maintaining this function or improving its accuracy. Brent Lewis has written a much better function that includes altitudes upwards of 2000 km and also molecular composition. This is excellent for both aircraft, rockets, and for use in atmospheric drag calculations. If you require high degrees of accuracy and the more complete version, please use Mr. Lewis' software. However, if you need a simple function with lower accuracy, by all means, try mine.
27 Oct 2007	Brad Hixon	Accuracy is far below what is required in most aerospace classes now
01 Jan 2008	Michael Young	Errors in calculated values. Don't Use

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Updates
04 Nov 2005	Found some big bugs in it that made the function not work. Everything is all better now ^_^
20 Mar 2006	Was informed about bad returns for density and that the code referenced a 1958 standard atmosphere. The density has been fixed and all altitude and lapse rates have been updated to the 1976 version.
09 May 2006	An error was discovered in the upper atmosphere section of the code. This has been fixed. The software can now accept vector inputs as opposed to just a single altitude.