Method of reducing ambiguities in synthetic aperture radar, and

Details Method of reducing ambiguities in synthetic aperture radar, and Method of reducing ambiguities in synthetic aperture radar, and

1996-06-14

1998-09-29

Eldred, J. Woodrow

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

Synthetic aperture radar

342132, G01S 1300

Patent

active

058151117

ABSTRACT:
A method of defocusing range ambiguities in a pulse radar, in particular of the SAR type, the method comprising the following steps:
radar pulses are spread on transmission by using a plurality of "chirp" rules for varying the frequency of the transmitted wave as a function of time;
during transmission of successive pulses, chirp rules are alternated between chirps that rise and chirps that fall in the frequency/time plane of the pulse;
received echoes are compressed by matched filtering using a correlation operation between the received echo signal and the chirp rule that was applied at the time of transmission of the pulse that gave rise to said echo signal;
said method being characterized in that said plurality of rules for varying the frequency of the transmitted wave as a function of time comprise a number M of said rules, with M being an integer greater than or equal to 3.

REFERENCES:
patent: 3363248 (1968-01-01), Nicodemus
patent: 4096478 (1978-06-01), Chavez
patent: 4309703 (1982-01-01), Blahut
patent: 4724418 (1988-02-01), Weindling
patent: 4847624 (1989-07-01), Hopwood et al.
patent: 4960329 (1990-10-01), Schofield
patent: 5051749 (1991-09-01), Stoyle

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