Synthetic aperture radar hybrid-polarity method and architecture for obtaining the stokes parameters of a backscattered field
AssigneeThe Johns Hopkins University
InventorRussell K. Raney
Life of this patent
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Abstract
A synthetic aperture radar hybrid-polarity method and architecture comprising transmitting circular polarization (by driving the orthogonal linear feeds simultaneously by two identical waveforms, 90° out of phase), and receiving horizontal (H) and vertical (V) linear polarizations, coherently. Once calibrated, the H and V single-look complex amplitude data are sufficient to form all four Stokes parameters, which fully characterize the observed backscattered field.
Claims12
A method for obtaining the Stokes parameters representing a backscattered field from a partial polarimetric synthetic aperture radar (SAR) comprising the steps of:
- transmitting a circularly polarized field by the SAR;
- receiving a coherently dual linear polarized backscattered field;
- and
- using data embedded in the received backscattered field to obtain the Stokes parameters.
A partial polarimetric synthetic aperture radar (SAR) for obtaining the Stokes parameters representing a backscattered field comprising:
- a dual linearly-polarized antenna comprising a horizontal (H) feed and a vertical (V) feed;
- a transmitter operatively connected to the antenna;
- a 90 degree hybrid operatively connected to the transmitter and the antenna for simultaneously driving the H and V feeds 90 degrees out of phase thereby causing the antenna to radiate a circularly polarized field;
- a receiver operatively connected to the antenna for receiving a coherent H and V linearly polarized backscattered field;
- and
- a processor operatively connected to the receiver for obtaining the Stokes parameters from data embedded in the backscattered field.
Dependencies are inferred from the claim text.