CIC-3 Home | Visitor Info | Teams | Projects | Publications | Internal
Navigation Map | Calendar | News | Phone Book | Search
Main Page

MATLAB FILES USED TO SORT AND ANALYZE THE SIGNALS

MATLAB CAN BE OBTAINED HERE
 
M file 

spec.m 

specbin.m 

prewhite.m 
 
prewspec.m 

dechirp.m 
 
autoplot.m 
 
 
 
 powplot.m 

acorr.m 

findmax.m 

shift.m 
 
batch1.m 
 
 
plottec.m 

graphic.m 
 
 
my5.mat 
 

raw.m 

statplot.m 
 
 

Description

Reads (ascii) signal data into MATLAB and converts it into a spectrogram.  Will also display spectrogram as an image. 
 
Very similar to spec.m, but is used for binary data instead of ascii data. 

Supresses the carriers which may be present in the signal by making their average powers equal to the median power of the signal. 
 
Displays the pre-whitened signal as an image. 

"Straightens" the signal to determine what it would look like without the ionospheric dispersion.  Also displays the de-chirped signal. 
 
Computes the instantaneous power of the signal vs. time and the power-autocorrelation of the power plot.  Computes the total electron content, the optimally de-chirped, prewhitened, average power, the power-autocorrelation 1/e width and signal-to-noise ratio, the peak power, and the contrast. 
 
Plots the instantaneous power vs. time. 

Computes the circular autocorrelation of the power signal. 

Determines the location and value of the signal's secondary peak - if there is one. 

Performs a circular shift on a row of data.  This is a very simple function used for dechirping the signal. 

This is the batch file that I used to sort each signal and its associated compressed versions.  It runs through each of the seven processes as well as runs the graphic.m file which outputs the process' results to a jpeg file. 
 
 Plots the Figure of Merit vs. Total Electron Content. 

This file was used to essentially rename to image file created using the print command in order to maintain consistancy between file names.  This is probably less efficient than using the eval.m command, but it works, and I saw no reason to rewrite the program. 

This is the matrix that I used as a colormap.  This allows for good contrast  of pseudocolor in the upper power regions while supressing the background slightly using darker colors.  This matrix can be retreived using the load.m command. 

Plots the raw signal vs. time. 

Program for reading in and ploting the derived statistical information.  Generates a jpeg image of the plot and saves it according to the signal name. 
 
 

 
 TOP OF PAGE

L O S   A L A M O S   N A T I O N A L   L A B O R A T O R Y
Operated by the University of California for the Department of Energy
CIC - 3  | c3webmeister@c3.lanl.gov | LANL | Copyright © UC 1998 | Disclaimer | 25 June 1998
Shane Crockett <m991368@nadn.navy.mil>  and C M Brislawn <brislawn@jacobs.c3.lanl.gov>