News Column

Patent Issued for Doppler Compensation for a Coherent LADAR

July 16, 2014



By a News Reporter-Staff News Editor at Defense & Aerospace Week -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Coda, Robert J. (Torrance, CA); Klotz, Matthew J. (Pasadena, CA); Bulot, Jean-Paul (El Segundo, CA), filed on December 13, 2011, was published online on July 1, 2014.

The patent's assignee for patent number 8767187 is Raytheon Company (Waltham, MA).

News editors obtained the following quote from the background information supplied by the inventors: "While collecting heterodyned data in a coherent LADAR (laser detection and ranging) system, velocity differences between a sensor and an object the sensor is evaluating cause large Doppler shifts in a received signal. These Doppler shifts cause the frequency of the heterodyned signal to vary. Thus, the bandwidth of the receiver must be sufficiently large to account for this variation in the frequency and, in most cases, an excessively large receiver bandwidth may be required."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "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.

"In another aspect, an article includes a non-transitory machine-readable medium that stores executable instructions. The instructions cause a machine to represent a range of Doppler frequency offsets as a local oscillator waveform comprising a plurality of digital waveform samples, select a portion of the plurality of digital waveform samples using a Doppler value to form an optical heterodyne and generate a signal associated with a target within a bandwidth of a receiver using the optical heterodyne.

"In a further aspect, an apparatus, includes circuitry to represent a range of Doppler frequency offsets as a local oscillator waveform comprising a plurality of digital waveform samples; select a portion of the plurality of digital waveform samples using a Doppler value to form an optical heterodyne; and generate a signal associated with a target within a bandwidth of a receiver using the optical heterodyne."

For additional information on this patent, see: Coda, Robert J.; Klotz, Matthew J.; Bulot, Jean-Paul. Doppler Compensation for a Coherent LADAR. U.S. Patent Number 8767187, filed December 13, 2011, and published online on July 1, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8767187.PN.&OS=PN/8767187RS=PN/8767187

Keywords for this news article include: Raytheon Company, Aerospace and Defense Companies.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Defense & Aerospace Week


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