Boots – shoes – and leggings
Patent
1981-01-22
1983-02-08
Malzahn, David H.
Boots, shoes, and leggings
343 5FT, 343 172PC, G01S 1328
Patent
active
043731902
ABSTRACT:
A digital pulse expander-compressor for use in pulse compression radars and having the advantage of precompression bandwidth tolerance. The pulse expander-compressor exploys a discrete Fourier transform circuit and multi-stage delay line feeding inputs x(n) to the discrete Fourier transform circuit to generate outputs in accordance with the formula ##EQU1## where n is the sequence number of the clock pulse; N is 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 s(k), O.ltoreq.k.ltoreq.N/2-1, by ##EQU2## clock pulse intervals, while delaying the subpulse s(k), N/2+1.ltoreq.k.ltoreq.N-1, by ##EQU3## clock pulse intervals. The subpulse s(k), k=N/2, is not used. The pulse expander-compressor generates and compresses a polyphase code pulse with a pulse compression ratio of M.sup.2 where M is an odd integer less than N. An odd integer is desired so that the code can be made to have conjugate symmetry about the zero modulation frequency code subsequence.
REFERENCES:
patent: 3680105 (1972-07-01), Goldstone
patent: 4028700 (1977-06-01), Carey et al.
patent: 4153900 (1979-05-01), Novak et al.
patent: 4156876 (1979-05-01), Debursser
patent: 4196435 (1980-04-01), Phillips, Jr.
patent: 4237461 (1980-12-01), Cantrell et al.
Ohman, "Getting High Range Resolution with Pulse Compression Radar", Elecnics, Oct. 7, 1980, pp. 53-57.
Kretschmer Frank F.
Lewis Bernard L.
Beers Robert F.
Ellis William T.
Klein Alan P.
Malzahn David H.
The United States of America as represented by the Secretary of
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