Communications: directive radio wave systems and devices (e.g. – Clutter elimination – Mti
Patent
1986-07-03
1988-11-08
Heyman, John S.
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
Mti
342201, 328 27, 328163, H03B 104, H03B 2300
Patent
active
047836326
ABSTRACT:
A multi-arm frequency sweep generator 10 provides frequency sweep characterized by precise waveform control (linearization), steep slopes, and a high repetition rate. An impulser (12) generates pulses which are distributed by a multiplexer (14) to the multi-arms of the frequency sweep generator. Each arm includes a reflective array compressor (RAC) 16 for dispersion a throughgoing pulse into a frequency sweep of low enough slope that it can be effective corrected by means of complex multiplying digital-to-analog converters (18). The corrected sweeps are summed by a demultiplexer (20). A compressor RAC (22) compresses the summed output to provide sweeps with slopes steeper than would normally be correctable by the MDACs.
REFERENCES:
patent: 3579117 (1971-05-01), Norris
patent: 3639842 (1972-02-01), Zarcone et al.
patent: 4197540 (1980-04-01), Riggs et al.
patent: 4359736 (1982-11-01), Lewis
patent: 4404562 (1983-09-01), Kretschmer et al.
R. C. Williamson and H. I. Smith, "The Use of Surface-Elastic-Wave Reflection Gratings in Large Time-Bandwidth Pulse-Compression Filters," I.E.E.E. Transactions on Microwave Theory and Techniques, vol. MTT-21, No. 4, Apr. 1973, pp. 195-205.
Heyman John S.
Hughes Aircraft Company
Karambelas A. W.
Meltzer M. J.
Mitchell S. M.
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