Time-Delay Multiplexing of Two Beams in a Terahertz Imaging Radar
Abstract
We demonstrate a time-delay multiplexing technique that doubles the frame rate of a 660–690-GHz imaging radar with minimal additional instrument complexity. This is done by simultaneously projecting two offset, orthogonally polarized radar beams generated and detected by a common source and receiver. Beam splitting and polarization rotation is accomplished with a custom designed waveguide hybrid coupler and twist. A relative time lag of approximately 2 ns between the beams' waveforms is introduced using a quasi-optical delay line, followed by spatial recombination using a selectively reflective wire grid. This delay is much longer than the approximately 20-ps time-of-flight resolution of the 30-GHz bandwidth radar, permitting the two beams' reflected signals from a compact target to be easily distinguished in digital post-processing of the single receiver channel.
Additional Information
© 2010 IEEE. Manuscript received December 07, 2009; revised April 27, 2010; accepted April 28, 2010. Date of publication June 07, 2010; date of current version July 14, 2010. This work was carried out by the Jet Propulsion Laboratory (JPL), California Institute of Technology, under a contract with the National Aeronautics and Space Administration (NASA). This work was supported under a contract to the Division of Biology, California Institute of Technology, by the Naval Explosive Ordnance Disposal Technology Division, with funding provided by the Department of Defense (DoD) Physical Security Equipment Action Group (PSEAG).Attached Files
Published - Llombart2010p11508Ieee_T_Microw_Theory.pdf
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Additional details
- Eprint ID
- 20373
- Resolver ID
- CaltechAUTHORS:20101011-112048495
- Department of Defense (DoD) Physical Security Equipment Action Group (PSEAG)
- NASA/JPL/Caltech
- Created
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2010-11-23Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field