Efficient low-sidelobe pulse compression

Details Efficient low-sidelobe pulse compression Efficient low-sidelobe pulse compression

1981-04-15

1983-05-17

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5FT, 343 5NQ, G01S 1328

Patent

active

043842917

ABSTRACT:
A pulse compression system for use with step approximation to linear FM and rank 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 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.

REFERENCES:
patent: 3680105 (1972-07-01), Goldstone
patent: 4028700 (1977-06-01), Carey et al.
patent: 4237461 (1980-12-01), Cantrell et al.

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