Gamma MSP: Reference Manual

Processing Parameter file

MSP processing parameter file: (ASCII text-file): such as p<orbit>.slc.par

NAME
p<orbit>.slc.par - The parameters in the MSP processing parameter file command the processor and report the results of processing.

EXAMPLE
p.7225.slc.par: An example to generate a single look complex (SLC) image for ERS-1 SAR raw data using the Gamma MSP:

title:	Sydney orbit 7225
date:	1992 12 2
raw_data_start_time:	12 59 16.3623
channel/mode:	VV
earth_semi_major_axis:	6378137.0000 m
earth_semi_minor_axis:	6356752.3141 m
scene_center_latitude:	-33.408930 decimal degrees
scene_center_longitude:	151.428214 decimal degrees
track_angle:	-17.786854 degrees
platform_altitude:	797236.8885 m
terrain_height:	0.0000 m
sensor_position_vector:	0.000000 0.000000 797236.888473 m m m
sensor_velocity_vector:	7120.354250 0.000000 0.000000 m/s m/s m/s
sensor_acceleration_vector:	0.000000 0.000000 0.000000 m/s^2 m/s^2 m/s^2
pulse_repetition_frequency:	1679.902394 Hz
I_bias:	15.330689
Q_bias:	15.403095
I_sigma:	4.892531
Q_sigma:	4.873933
IQ_corr:	-0.016376
SNR_range_spectrum:	18.028
DAR_doppler:	483.785 Hz
DAR_snr:	6.346
doppler_polynomial:	5.23685e+02 -1.42805e-04 -1.18529e-09 1.26902e-14 Hz Hz/m Hz/m^2 Hz/m^3
doppler_poly_dot	4.57287e+00 3.07875e-05 0.00000e+00 0.00000e+00 Hz/s Hz/s/m Hz/s/m^2
doppler_poly_dot	0.00000e+00 0.00000e+00 0.00000e+00 0.00000e+00 Hz/s^2 Hz/s^2/m Hz/s^2/m^2 Hz/s^2/m^3
echo_time_delay:	5.606270e-03 s
receiver_gain:	-15.00000 dB
calibration_gain:	0.00000 dB
near_range_raw:	840358.7318 m
center_range_raw:	862554.6001 m
far_range_raw:	884750.4684 m
near_range_slc:	840358.7318 m
center_range_slc:	853767.1708 m
far_range_slc:	867167.7040 m
range_pixel_spacing:	7.90591925 m
range_resolution:	13.49548042 m
sec_range_migration:	OFF
azimuth_deskew:	OFF
autofocus_snr:	48.0031
azimuth_bandwidth_fraction:	0.8000
azimuth_presum_factor:	1
total_raw_echos:	28000
offset_to_first_echo_to_process:	8192
echoes_to_process:	6000
range_offset:	0 samples
raw_range_samples:	4096
far_range_extension:	0
near_range_extension:	0
range_looks:	1
azimuth_looks:	1
azimuth_offset:	5.20209 s
azimuth_pixel_spacing:	4.07418 m
azimuth_resolution:	4.98331 m
range_pixels:	3392
azimuth_pixels:	4907
image_format:	FCOMPLEX
sensor_latitude:	-34.044705 decimal degrees
sensor_longitude:	148.420538 decimal degrees
sensor_track_angle:	-142.061475 decimal degrees
map_coordinate_1:	-33.5830257 151.0704025 0.0000 deg. deg. m
map_coordinate_2:	-33.4140581 151.8108727 0.0000 deg. deg. m
map_coordinate_3:	-33.4116550 151.0056088 0.0000 deg. deg. m
map_coordinate_4:	-33.2430451 151.7442523 0.0000 deg. deg. m
map_coordinate_5:	-33.4089298 151.4282142 0.0000 deg. deg. m
number_of_state_vectors:	5
time_of_first_state_vector:	46756.36328 s
state_vector_interval:	3.75200 s
state_vector_position_1:	-5054313.6408 3089759.0195 -4037474.9145 m m m
state_vector_velocity_1:	-2597.2075 3662.2046 6060.8538 m/s m/s m/s
state_vector_position_2:	-5063164.7212 3104867.9900 -4014703.8025 m m m
state_vector_velocity_2:	-2573.7903 3651.8231 6077.2265 m/s m/s m/s
state_vector_position_3:	-5071923.7485 3119940.2723 -3991871.4297 m m m
state_vector_velocity_3:	-2550.3456 3641.3611 6093.5070 m/s m/s m/s
state_vector_position_4:	-5080590.6303 3134975.5394 -3968978.1428 m m m
state_vector_velocity_4:	-2526.8737 3630.8188 6109.6950 m/s m/s m/s
state_vector_position_5:	-5089165.2755 3149973.4648 -3946024.2892 m m m
state_vector_velocity_5:	-2503.3751 3620.1962 6125.7903 m/s m/s m/s

FORMATS AND DEFINITIONS
The formats are defined in the MSP type definition file typedef_MSP.h

title:	title of the scene and processing parameters
date:	date DD MMM YYYY)
raw_data_start_time:	time of first record in signal data file (HH MM SS.SSSS)
channel/mode:	polarization/channel to be processed out of the set {HH, HV, VH, VV, CH1, CH2}
earth_semi_major_axis:	ellipsoid semi-major axis (m)
earth_semi_minor_axis:	ellipsoid semi-minor axis (m)
scene_center_latitude:	latitude of scene center (decimal deg.)
scene_center_longitude:	longitude of scene center (decimal deg.)
track_angle:	track angle (degrees)
platform_altitude:	altitude above geoid (m)
terrain_height:	average height of terrain above geoid (m)
sensor_position_vector:	(x,y,z)-position of the SAR platform (m) at the center of the prefiltered data
sensor_velocity_vector:	velocity of the SAR platform (m/sec) at the center of the prefiltered data
sensor_acceleration_vector:	acceleration of the SAR platform (m/sec^2) at the center of the prefiltered data
pulse_repetition_frequency:	radar pulse repetition frequency (pulses/sec)
I_bias:	DC bias of the raw data I channel
Q_bias:	DC bias of the raw data Q channel
I_sigma:	standard deviation of the raw data I channel
Q_sigma:	standard deviation of the raw data Q channel
IQ_corr:	correlation of the I and Q channels
SNR_range_spectrum:	average SNR determined from range spectrum
DAR_doppler:	Doppler ambiguity resolver estimate of the doppler centroid at center swath
DAR_snr:	unambiguous doppler estimate signal to noise ratio
doppler_polynomial:	Doppler polynomial coeff. fd(r, t) = a0 + b0t + c0t*2 + (a1 + b1t)r + a2r**2 a0=fdp[0], a1=fdp[1], a2=fdp[2], a3=fdp[3]
doppler_poly_dot	fdot(r, t) = b0t + (b1t)*r b0=fdp_dot[0], b1=fdp_fdot[1]
doppler_poly_ddot	fddot(r, t) = c0t*2 b0=fdp_ddot[0]
sec_range_mig:	secondary range migration (ON, OFF)
az_deskew :	azimuth deskew of data to zero doppler (ON, OFF)
autofocus_snr:	autofocus signal to noise ratio
echo_time_delay:	time delay between transmission of pulse and first sample of echo (seconds)
receiver_gain:	receiver attenuation gain used for relative calibration (dB)
calibration_gain:	calibration gain factor to determine relative or absolute backscatter intensity
near_range_raw:	first slant range for the RAW SAR data
center_range_raw:	center slant range for the RAW SAR data
far_range_raw:	last slant range for the RAW SAR data
near_range_slc:	first slant range for the output image
center_range_slc:	center slant range for the output image
far_range_slc:	last slant range for the output image
range_pixel_spacing:	slant range image pixel spacing (m)
range_resolution:	slant range image resolution (m)
azimuth_bandwidth_fraction:	fraction of doppler bandwidth to process (Hz)
prefilter_azimuth_offset:	initial azimuth prefilter decimation factor (i.e. 4 for a 4:1 decimation)
total_raw_echoes:	total number of raw data echoes in the SAR signal data file
offset_to_first_echo_to_process:	offset in echoes from the start of SAR signal data file
echoes_to_process:	number of echoes to process
range_offset:	offset (samples) to first range sample to process, each I/Q pair counts as 1 sample
raw_range_samples:	number of raw range samples to process in each echo
near_range_extension:	number of samples to extend the swath in the near range (with loss of resolution)
far_range_extension:	number of samples to extend the swath in the far range (with loss of resolution)
range_looks:	number of range looks per sub-aperture
azimuth_looks:	number of azimuth looks per sub-aperture
azimuth_offset:	azimuth offset (s) of first image line from first prefiltered data line
azimuth_pixel_spacing:	azimuth image pixel spacing (m)
azimuth_resolution:	azimuth image resolution (m)
range_pixels:	image size in range
azimuth_pixels:	image size in azimuth
image_format:	data format for image data: FCOMPLEX, SCOMPLEX, FLOAT, SHORT, BYTE
sensor_latitude:	SAR geodetic latitude at image center (deg.)
sensor_longitude:	SAR geodetic longitude at image center (deg.)
sensor_track_angle:	track angle of the sensor at image center (deg.)
map_coordinate_1:	latitude (dec. deg.), longitude (dec. deg.) and elevation (m) of 1. corner of processed image
map_coordinate_2:	latitude (dec. deg.), longitude (dec. deg.) and elevation (m) of 2. corner of processed image
map_coordinate_3:	latitude (dec. deg.), longitude (dec. deg.) and elevation (m) of 3. corner of processed image
map_coordinate_4:	latitude (dec. deg.), longitude (dec. deg.) and elevation (m) of 4. corner of processed image
map_coordinate_5:	latitude (dec. deg.), longitude (dec. deg.) and elevation (m) of center of processed image
number_of_state_vectors:	number of state vectors given in this file
time_of_first_state_vector:	time of first state vector (s)
state_vector_interval:	time interval between state vectors (s)
state_vector_position_1:	(x,y,z)-coordinates of state vector 1 (m)
state_vector_velocity_1:	(x,y,z)-coordinates of velocity of state vector 1 (m/sec)
state_vector_position_2:	(x,y,z)-coordinates of state vector 2 (m)
state_vector_velocity_2:	(x,y,z)-coordinates of velocity of state vector 2 (m/sec)
state_vector_position_3:	(x,y,z)-coordinates of state vector 3 (m)
state_vector_velocity_3:	(x,y,z)-coordinates of velocity of state vector 3 (m/sec)
state_vector_position_4:	(x,y,z)-coordinates of state vector 4 (m)
state_vector_velocity_4:	(x,y,z)-coordinates of velocity of state vector 4 (m/sec)
state_vector_position_5:	(x,y,z)-coordinates of state vector 5 (m)
state_vector_velocity_5:	(x,y,z)-coordinates of velocity of state vector 5 (m/sec)

DESCRIPTION
This parameter file is usually created by reading the CEOS leader file included with raw data from ERS, JERS-1, and Radarsat. These readers are adapted to the particular format of CEOS leader file produced by each of the receiving stations. Due to the differnences between the various implementations between the CEOS format different readers are required for each of these implementations. If no specific program exists for your format there exits the more general program requiring user input of all critical parameters called create_proc_par. Alternatively, an existing processing parameter file can be modified using a standard text editor. The variables used in p<orbit>.slc.par are defined in the in MSP type definition file typedef_MSP.h. Contact Gamma if you are experiencing difficulty with a particular format.