US 2009/0262011 A1Published application

Instantaneous Radar Polarimetry

OwnerArthur Robert Calderbank, Stephen David Howard +1inventors

InventorsArthur Robert Calderbank, Stephen David Howard, William Moran

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Abstract

A radar system and method that employs polarization-time diversity in transmitting signals and concurrently processing received reflections from both polarization modes provides information about the scattering matrix of a target without loss of information. Illustratively, the transmitted signals from Golay pairs, and the processing method employs a complex-conjugate time reversal operand. The received reflected signals are processed for a particular distance in mind to develop a scattering matrix of the medium at that distance. By comparing the scattering matrix to known scattering matrices an identification of the target from where the transmitted signals were reflected is obtained.

Claims10

Dependent claims

A method for developing information about objects that reflect electromagnetic signals that reach the objects, comprising the steps of:

transmitting a first signal in a first polarization mode and a second signal in a second polarization mode, where the first polarization mode is orthogonal to the second polarization mode;
transmitting a third signal in the first polarization mode and a second signal in the said second polarization mode;
receiving a fifth signal having said first polarization mode that results from said first signal and from said second signal, a sixth signal having said second polarization mode that results from said first signal and from said second signal;
receiving a seventh signal having said first polarization mode that results from said third signal and from said fourth signal, an eighth signal having said second polarization mode that results from said third signal and from said fourth signal;
processing said fifth signal, said sixth signal, said seventh signal and said eighth signal together to create said information about objects;
and
employing the created information to characterize object that produced said fifth, sixth, seventh and eighth signals.

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Dependencies are inferred from the claim text.