Accession Number:

ADD005357

Title:

Doppler Processing Method and Apparatus.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s):

Report Date:

1978-07-04

Pagination or Media Count:

10.0

Abstract:

A method and apparatus for determining the value of a Doppler frequency shift component delta f present in a signal f or - delta f employing a correlation process which utilizes the Mellin transform and is scale invariant. The location of the correlation peak in the reference coordinate system used provides a measure of the magnitude of delta f. The sequence of steps involved in the correlation process when optical apparatus is used include forming a transmittance pattern of the signal f or - delta f, which has a horizontal scale that is the natural log of the time scale of the original signal, forming a similarly scaled transmittance pattern of the reference signal, f, and utilizing the first pattern in the input plane of a frequency plane correlator that has a holographic matched spatial filter that is produced from the second pattern and contains a term corresponding to the conjugate of the Mellin transform of the reference signal in its frequency plane. Author

Subject Categories:

  • Lasers and Masers
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE