Technologies


Hybrid-Polarity Synthetic Aperture Radar Architecture

Reference#: P02332


Market Need
In many applications using space-based synthetic aperture radar (SAR), the prime objective is to maximize the measurement potential in response to backscatter from a random field whose elements have unknown orientation relative to the polarity of the radar's illumination. Measurement potential is maximized, if and only if, the data products are the Stokes parameters of the backscattered field (or their logical equivalent). Rotational invariance implies that the transmitted polarization must be circular. The choice of polarization basis for the receiver is open to optimization of the radar's design within reliability, mass, and power constraints.

Technology Solution
The high-level objective of "partial polarimetry" or "compact polarimetry" developed by researchers at the Johns Hopkins Applied Physics Laboratory (JHU/APL) is to exploit coherent dual-polarized radar data to realize many of the benefits of a quadrature-polarized system without the attendant costs, such as halved swath coverage and doubled average transmitter power. It should be stressed that any partial-polarimetry scheme is not an equivalent substitute for quadrature polarization. Partial polarimetry simply is a major and efficient step up from a single channel system towards full polarimetric measurement capabilities. Partial polarimetry is a reasonable strategy when system resources (power, mass, data volume, or cost) preclude full polarimetry. Partial polarimetry is also compatible as an optional mode for any radar that implements full polarimetry.

The Opportunity
We are seeking a commercial transition licensee, either a start-up or an existing company, focusing on non-US Government customers who can successfully commercialize this IP.

Patent Status: U.S. patent 8,258,996 and 7,746,267 issued.

CONTACT:
Mr. E. Chalfin
Phone: (443) 778-7473
ott-techmanager5@jhuapl.edu