Accession Number : ADD010717

Title :   Efficient Low-Sidelobe Pulse Compression.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Lewis,B L ; Kretschmer,F F , Jr

Report Date : 17 May 1983

Pagination or Media Count : 11

Abstract : A pulse compression system for use with step approximation to linear FM and Frank coded signals to eliminate sampling errors and range time grating lobes while providing large pulse compression ratios comprising: a receiving circuit for receiving echo signals, a converting circuit for converting echo signals from the receiver to I and Q baseband signals without clock sampling, a sliding window discrete Fourier Transform or fast Fourier Transform (FFT) circuit including a taped delay line and a plurality of resistor-type phase weighting networks and adders for generating a plurality of output signals representing the different frequency steps in the signals, a delay circuit for differentially delaying the output frequency steps from the sliding window DFT circuit so the output steps occur simultaneously, and a summer for adding the differentially delayed outputs to yield a short pulse with a peak amplitude when a coded echo pulse is correctly indexed within the delay line of the DFT circuit. (Author)

Descriptors :   *Patents, *Pulse compression, *Radar pulses, *Pulse analyzers, *Signal processing, *Phase shift circuits, Fast fourier transforms, Delay lines, Discrete fourier transforms, Compression ratio, Weighting functions, Radar receivers, Circuit analysis, Orthogonality, Low level, Error correction codes, Frequency modulation, Echoes, Output, Linear systems, Coding, Sampling, Sidelobes, Clocks, Bandwidth, Networks

Subject Categories : Electrical and Electronic Equipment
      Cybernetics
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE