Correction of spatial non-uniformities in sonar, radar, and holographic acoustic imaging systems
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsNewell O. Booth, Benjamin A. Saltzer, James V. Thorn, Jerry L. Sutton
Life of this patent
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Abstract
An improved method and apparatus for processing electronic signals for use n establishing an improved image display includes storing the electronic and acoustic response of all the detectors in response to impingement thereon by a plane wave-front as stored in a memory. In the operational environment, these stored signals are combined with the transducer response and the signals are combined in such a fashion as to compensate for spatial nonuniformities.
Claims14
A signal processing method for correction of spatial nonuniformities in a radiation holographic imaging system having a sensor array comprising, in combination, the strips of;
- impinging said sensor array with a plane wavefront;
- measuring the output of the individual sensors in the array in response to the plane wavefront;
- processing the measured output plane wave signals of the individual transducers, and recording the processed output as a retrievable correction signal;
- placing the imaging system in an operational environment;
- receiving radiated signals from said operational environment to generate temporal signals within the sensor array;
- combining individual signals generated in the sensor array by said radiated signals and recorded correction signals to obtain a corrected signal;
- and
- processing the corrected signal to obtain an image.
An enhanced hologram signal processing system comprising:
- an array of individual wave energy sensors;
- digital memory means for storing a correction signal associated with the response of said individual wave energy sensors;
- scanning means connected to each of said array of wave energy sensors and said digital memory means for sequential and timely sampling individual wave energy sensors and the associated correction signal in said digital memory means;
- signal combining means effectively connected to said digital memory means and said array of individual wave energy sensors for combining the scanned outputs therefrom whereby a corrected signal free from spatial nonuniformities is obtained.
Dependencies are inferred from the claim text.