Mstar SAR database in the United States

This is my favorite U.S. Radar Image website, which contains some American public radar image data.

 

The Center for imaging science has been provided with this series of one-foot IPR synthetic aperture radar (SAR) images courtesy of Thomas J. burns, the mstar program manager for DARPA. this data was collected using the Sandia National Laboratories Twin Otter SAR sensor payload operating at X band. the data is collected and distributed under the DARPA moving and stationary target recognition (mstar) program.

There are a total of seventeen image sets, with each set containing data for a particle target imaged at a particle depression angle. each set contains data for hundreds of degrees of Target Aspect pose for that target at that angle of depression.

Explanation of data formats:

For each particle combination of target, depression angle, and aspect pose, we have the three files listed below. Note: Each downloadable clutter tar. Z file contains these three filesOneClutter image while each downloadable target tar. Z file contains these three filesBytesAspect posesOneTarget at a participating angle of depression (where values may be between 100 and 300 degrees of aspect pose ). in all, the tar. Z files contain each of the following from some 2,791 data sources.

?????. Nxxny. Raw

The original data, containing an NX by NY series of floating point data representing the magn1_data, and another NX by NY series of floating point data representing the phase data.

?????. Hdr.txt

A text file containing information about the target, the sensor, and the environment.

?????. GIF

A GIF created by applying the following algorithm to the original data file:

For each pixel I

Mag = magnbench [I]

PHS = phase [I]

Real = mag * Cos (2 * pI * PHS/4096)

Imag = mag * sin (2 * pi x PHS/4096)

GIF [I] = log10 (Real * real + imag * IMAG)

Endfor

Additional Notes on data format (1/2/2001)

The mstar data files on the original CDs from sdms begins with an ASCII text header describing the target, its pose, the data collection site, etc. following this header is the raw, complex-valued SAR image data. this image data consists of a n_rows x n_columns array of pixel magnitudes (32 bit floating point) followed by an array of the same size containing phase data (in radians) for each pixel. the data is stored row-wise.

The mstar files available from the CIS Web site have had the ASCII header removed. the following snippet of Matlab code will read a single image provided the file has been opened resulting in a file pointer, FP:

Mstar_size = n_rows * n_cols;

[Tmp_data, num] =

Fread (FP, mstar_size * 2, 'float ');

% Reshape works by column, but mstar data is stored by rows so the reshape

% Arguments look funny.

Tmp_mag = reshape (tmp_data (1: mstar_size), n_cols, n_rows ).';

Tmp_phs = reshape (tmp_data (mstar_size + * mstar_size), n_cols, n_rows ).'

It is not clear how the GIF images were created but they were most likely taken off the CDs from sdms. however, the above Code will give you the floating point magn1_data which can be converted to gray scale with any histogram you like. I find a logarithmic transformation produces images that are pleasant to look at (you'll need to add a small constant, say 0.00001, to the magnbench data since some pixels may be zero ). of course, for ASD or other processing we use the magn1_data directly.

The values in tmp_phs are all in the range from 0 to 2PI if the data is read in correctly.

Seventeen SAR data sets

This data is available with registered usernames and passwords. if you have already registered, and your registration has been confirmed, you may proceed to the download page. where the following data sets will be available ....

	Clutter data of rural and urban scenes near Redstone arsenal at huntville, Alabama (Sample image: 428kb) each of the following tar. Z files is roughly 10 MBCompressed. Angle of depression: Target #1: 15 degrees (List of one hundred clutter tar. Z files suppressed)
	Slicy canonical target (Sample image: 2kb) Angle of depression: Target #1: 15 degrees (5.6 MB) 30 degrees (5.3 MB)
	Former Soviet Union T-72 main battle tank (Sample image: 6kb) Angle of depression: Vehicle #1: 15 degrees (18.2 MB) 17 degrees (21.6 MB) Vehicle #2: 15 degrees (18.1 MB) 17 degrees (21.5 MB) Vehicle #3: 15 degrees (17.7 MB) 17 degrees (21 MB)
	Former Soviet Union BMP-2 (armored personnel carrier) (Sample image: 6kb) Angle of depression: Vehicle #1: 15 degrees (18.2 MB) 17 degrees (21.7 MB) Vehicle #2: 15 degrees (18.2 MB) 17 degrees (21.6 MB) Vehicle #3: 15 degrees (18.2 MB) 17 degrees (21.7 MB)
	Former Soviet Union BTR-70 (armored personnel carrier) (Sample image: 6kb) Angle of depression: Vehicle #1: 15 degrees (18.2 MB) 17 degrees (21.7 MB)