Accession Number:

AD0736153

Title:

A High-Speed Digital Fourier Analyzer.

Descriptive Note:

Technical memo.,

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1971-07-01

Pagination or Media Count:

71.0

Abstract:

The report describes a processor that is being used for radar and multichannel sonar spectral analysis of band-limited input signals. Its design is based on a shift register implementation of a fast Fourier transform algorithm coupled with a single flow-through arithmetic unit. It is one of the fastest systems in operation, and is capable of transforming 4096 complex input data samples in less than 12 ms. Speed is obtained by using an organization that performs the rapid data reordering required for execution of the algorithm. A post-processing unit is used to increase the quality of estimation of line spectra in statistically short term spectra. The unit can be used either as an integrator or as a first order recursive filter. It is implemented in a floating point format to maintain its dynamic range. Hardware is kept to a minimum by establishing minimum and maximum ratios of the two signals required in the recursive filter computation. Author

Subject Categories:

  • Computer Hardware
  • Acoustic Detection and Detectors
  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE