Method of reducing ambiguities in synthetic aperture radar, and radar implementing the method
US5815111A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1996 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Jun 14, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.