Method for calibrating a plurality of data channels in a vector sensor
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorSteven E. Crocker
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Abstract
A system, processor and method of use for calibration processing is provided to calibrate acoustic vector sensor data collected at comparatively close range. Vector sensor data collected at close range includes data collected with source-to-receiver separations ranging from a one-tenth to approximately two acoustic wavelengths. The calculations substantially account for the acoustic impedance of a spherically diverging wave front, where the curvature is sufficiently pronounced to cause errors in resulting measurements in the calculations. The processing uses information contained within the vector sensor data to increase the accuracy of the vector sensor data.
Claims3
A method for calibrating a plurality of data channels in an acoustic vector sensor for simultaneously measuring acoustic pressure and particle motion in at least one direction in a point in space, said method comprising the steps of:
- providing a field data processor;
- receiving with the data processor, a reference sample set of collected data from a reference hydrophone that is arranged having a source-to-reference distance along a first direction wherein the reference sample set of collected data is produced by sampling an acoustic signal representing the acoustic pressure generated by the acoustic source;
- receiving with the data processor, a sensor sample set of collected data from the vector sensor that is arranged having an acoustic source-to-sensor distance along a second direction that is different from the first direction wherein the sensor sample set of collected data is produced by sampling acoustic signals representing the acoustic pressure and particle motion generated by the acoustic source;
- determining a range difference error in response to a comparison of the reference sample set of collected data and the sensor sample set of collected data of the vector sensor;
- correcting at least partially an estimated range difference error;
- correcting at least partially the acoustic pressure observed at the vector sensor;
- and
- correcting at least partially the particle motion observed at the vector sensor;
- wherein the vector sensor is calibrated based on said correcting steps.
Dependencies are inferred from the claim text.