Accession Number:

ADD012650

Title:

Method and Apparatus for Generating a Modified P1 Code.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Report Date:

1986-12-02

Pagination or Media Count:

7.0

Abstract:

A digital pulse expander-compressor for use impulse compression radars and having the advantage of precompression bandwidth tolerance. The pulse expander-compressor employs a discrete Fourier transform circuit and multi-stage delay line feeding inputs xn to the discrete Fourier transform circuit to generate outputs in accordance with the formula where n is the sequence number of the clock pulse zN is an even integer corresponding to the number of delay stages plus one and k is the number of the output subpulse from the transform circuit. An arrangement of delay stages differentially delays the output subpulses from the discrete Fourier transform circuit, and a coherent summer adds the real and imaginary parts of the signals from the delay lines. The delay stages delay the subpulse Fk by nN clock pulse intervals where n and k are interrelated by the formulae kN2-n for n0,1, ..., and N2 and k3N2-n for nN21, N22, ..., N-1. The pulse expander-compressor generates a modified, sq N element P1 polyphase code that is tolerant to receiver bandwidth limitation. Patents

Subject Categories:

  • Cybernetics
  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE