Raytheon Company

Robert J Coda

Christopher A Leddy

Matthew J Klotz

Stephen R Nash

Jean-Paul Bulot

Frank N Cheung

Johnny Y Lee

A method includes generating a transmit beam in different intervals of time and directing the transmit beam towards an area or object of interest. The method also includes receiving a receive beam that includes the transmit beam as reflected from the area or object of interest. The method further includes generating local oscillator (LO) laser light. The transmit beam and the LO laser light are frequency-shifted such that the transmit beam has a higher frequency than the LO laser light in a first subset of the intervals and a lower frequency than the LO laser light in a second subset of the intervals. In addition, the method includes processing the LO laser light and the receive beam to identify information about the area or object of interest.

Technique for reducing impact of backscatter in coherent laser detection and ranging (LADAR) systems

In one aspect, a method includes representing a range of Doppler frequency offsets as a local oscillator waveform comprising a plurality of digital waveform samples, selecting a portion of the plurality of digital waveform samples using a Doppler value to form an optical heterodyne; and generating a signal associated with a target within a bandwidth of a receiver using the optical heterodyne.

Doppler compensation for a coherent LADAR

An imaging system and method with an arrangement for sensing the performance of an optical system and providing data in response thereto and electronically correcting nonuniformity in the performance of the optical system in response thereto. In the illustrative application, the nonuniformity is a porthole effect. In the preferred embodiment, the arrangement for correcting includes an arrangement for providing an inverse distortion to an output of the system electronically. The inverse distortion is applied by generating a plurality of spatial correction coefficients from the performance data, storing the coefficients and applying the coefficients to current data from the optical system. The spatial correction coefficients are statistically generated gain and level correction defect maps. The present teachings should enable a correction of optical distortion in nonideal electro-optical systems without requiring additional optics.

Responsivity correction for electro-optical imagers

A system () and method for outputting data from a detector (). The novel system () includes a first controller () that samples the detector () at a first rate, a memory () for storing the sampled data, and a second controller () that outputs data from the memory () at a second rate. In a illustrative embodiment, the first rate is symmetrical from field to field, while the second rate is asymmetrical from field to field.

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Torrance, CA, United States of America

Robert J Coda