| spectral estimation e.g., MEM, MUSIC [message #10701] |
Wed, 14 January 1998 00:00  |
Jack Harlan
Messages: 4
Registered: October 1996
|
Junior Member |
|
|
I've checked all the large archives of IDL routines, but haven't been
able to find any existing IDL ports of various modern spectral
estimation techniques aka MSATs. These generally include maximum
entropy methods (such as Burg's algorithm), MUSIC algorithms, etc.
If no one else has done this, I'll probably convert some old
Fortran code myself.
But, if anyone knows of existing IDL code, I'd appreciate hearing
about it.
thanks
jack
--
* Jack Harlan
* NOAA Environmental Technology Laboratory
* 325 Broadway * Boulder, CO 80303
* 303-497-6032 PH * 303-497-3577 FAX
|
|
|
|
| Re: spectral estimation e.g., MEM, MUSIC [message #10777 is a reply to message #10701] |
Thu, 15 January 1998 00:00  |
Jeff Kommers
Messages: 2
Registered: June 1997
|
Junior Member |
|
|
There is a text by S. Lawrence Marple Jr. called "Digital Spectral
Analysis with Applications". It comes with some Fortran codes that
implement the various spectral analysis techniques, including Burg's
algorithm and MUSIC.
I have written a set of IDL and C wrappers for these Fortran codes so
that I can call them from IDL using call_external(). If you are
interested, post or send me e-mail.
I must warn that using the Fortran codes on different platforms
produced very different results using the test data supplied by
Marple. It appears to be a dependence on floating point
implementation: I got different results using a VAX, Sun (single
precision), and Sun (double precision). The spectra are qualitatively
similar, but the actual numbers differ by as much as 10 percent using
the modified covariance estimator (MODCOVAR). (!)
Jeff
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
