PSCOMPACT

Description

Parameters

pscompact(fili, filo, compty)

Name	Type	Caption	Length	Value range
FILI *	str	Input fully polarimetric SAR image	1 -
FILO *	str	Output synthesized compact pol image	1 -
COMPTY *	str	Compact pol type	1 - 4	CTLR| DCP| PI/4

* Required parameter

Parameter descriptions

FILI

The name of the input polarimetric SAR data set, which must be either non-symmetrized or symmetrized fully polarimetric (quad-polarization) complex data.

The input data set must already have been imported in PCIDSK (.pix) format by SARINGEST. Alternatively, it can be the key-file name of any GDB-supported POLSAR data set in its distribution format. For more information, including a complete list of supported SAR sensors and data products, follow the link to SARINGEST at the end of this topic.

FILO

The name of the output file that will hold the simulated compact pol data. There are three predefined compact configurations available: CTLR, DCP, and PI/4.

COMPTY

The compact pol type to be generated. The CTLR option generates a right circular transmit with linear horizontal and vertical receiver, RH and RV. The DCP option generates a right circular transmitter with right and left circular receivers, RR and RL. The PI/4 option generates a linear transmitter oriented at 45 degrees with linear horizontal and linear vertical receivers, 45,0,H and 45,0,V.

Details

PSCOMPACT creates a compact pol data set from the standard configurations. There are three configurations available:

• CTLR: circular transmit with linear receive. This mode, proposed by Raney, synthesizes a right circular transmitter with linear horizontal and linear vertical receivers, RH and RV. This is the mode used by the RISAT satellite and RADARSAT Constellation Mission (RCM).
• DCP: Dual Circular Pol. This mode, proposed by Stacey et al, synthesizes a right circular transmitter with right and left circular receivers, RR and RL.
• PI/4: PI over 4. This mode, proposed by Souyris et al, synthesizes a linear transmitter at 45 degrees with linear horizontal and vertical receivers, 45, 0, H and 45, 0, V.

The input file must be a non-symmetrized or symmetrized fully polarimetric (quad-polarization) SAR data set in scattering-matrix format, such as S4c or S3c.

The input file must be a data set that is already imported in PCIDSK format by SARINGEST. Alternatively, it can be the key file name of any GDB-supported POLSAR data set in its distribution format. For more information, and a complete list of supported polarimetric SAR sensors and data products, see SARINGEST.

Example

Create a synthesized data set representative of the RCM compact pol configuration using full-quad RADARSAT-2 data as input.

from pci.pscompact import pscompact

fili	=	"rsat2.pix"
filo	=	"rsat2_LR.pix"
comptyp = "CTLR"

pscompact( fili, filo, comptyp )

Algorithm

PSCOMPACT creates unit vectors representing the predefined transmit and receive polarizations. For each channel, the synthesized output is generated by multiplying the unit vector of the transmit polarization with the original full-quad-scattering data. The result is then multiplied by the transpose of the unit vector representing the receive polarization. The channel output is complex-valued.

There are three configurations available for compact pol:

• CTLR: circular transmit with linear receive. This mode, proposed by Raney, synthesizes a right circular transmitter with linear horizontal and linear vertical receivers, RH and RV. This is the mode used by the RISAT satellite and RADARSAT Constellation Mission (RCM).
• DCP: Dual Circular Pol. This mode, proposed by Stacey et al, synthesizes a right circular transmitter with right and left circular receivers, RR and RL.
• PI/4: PI over 4. This mode, proposed by Souyris et al, synthesizes a linear transmitter at 45 degrees with linear horizontal and vertical receivers, 45, 0, H and 45, 0, V.

References

R. K. Raney, "Hybrid-polarity SAR architecture", IEEE Trans. Geosci. Remote Sens., vol. 45, no. 11, 3397-3404, Nov. 2007.

N. Stacy and M. Preiss, "Compact Polarimetric Analysis of X-Band SAR Data", Proc. EUSAR 2006, 2006.

J. C. Souyris, N. Stacy, T. Ainsworth, J. S. Lee, and P. Dubois-Fernandez, "SAR compact polarimetry for Earth observation and planetology: Concepts and challenges, a study case at P band", Proc. POLINSAR, Frascati, Italy, 2007.