High resolution imaging radar linear frequency modulation bandwi

Details High resolution imaging radar linear frequency modulation bandwi High resolution imaging radar linear frequency modulation bandwi

1996-12-18

1998-07-07

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Synthetic aperture radar

342201, 342202, 342203, 342204, G01S 1390, G01S 7282

Patent

active

057775745

ABSTRACT:
An apparatus and method of linear frequency modulation waveform bandwidth multiplication including a digital linear frequency modulation waveform synthesizer for generating a synthesized waveform having an upchirp component of linearly varying frequency during a first half signal duration of the synthesized waveform followed by a downchirp component having linearly varying frequency during a second half of the signal duration of the synthesized waveform. The synthesized waveform is upconverted and subsequently bandpass filtered to provide a filtered waveform to a mixer for mixing with local oscillation signals. The upchirp and downchirp components of the filtered waveform are respectively mixed by first and second local oscillation signals having respective first and second oscillation frequencies in the mixer. The local oscillation signal frequencies have a predetermined relationship to ensure that the signal components of the output signal corresponding to the upchirp and downchirp components transition smoothly. The corresponding linear frequency modulation bandwidth multiplied signal has decreased nonlinearities.

REFERENCES:
patent: 4388622 (1983-06-01), Fletcher, Jr.

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