Details

Autor(en) / Beteiligte

• Liu, Bohao
• Seshadri, Suparna
• Wun, Jhih-Min
• O'Malley, Nathan P.
• Leaird, Daniel E.
• Chen, Nan-Wei
• Shi, Jin-Wei
• Weiner, Andrew M.

Titel

W-Band Photonic Pulse Compression Radar With Dual Transmission Mode Beamforming

Ist Teil von

• Journal of lightwave technology, 2021-03, Vol.39 (6), p.1619-1628

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2021

Quelle

IEEE Xplore

Beschreibungen/Notizen

• Millimeter wave (MMW) sensing systems have potential for enhanced range and angular resolution in comparison to lower radio frequencies. This article employs photonic-assisted radio-frequency arbitrary waveform generation to implement a high-bandwidth multi-target MMW radar. The presented sensing system operates in the W-band using chirped RF signals, with spectra between 80 and 95 GHz at the 10 dB points. We implement sum- and difference-mode beamforming using a two element transmitter array to perform azimuth angle sensing in addition to target ranging. Photonics-based waveform generation with programmable optical pulse shapers provides for incorporation of approximately uniform phase shifts across the entire bandwidth, which in turn enables control of the far-field interference patterns of the broadband waveforms. Our approach has analogies with monopulse tracking radar techniques, in which target angle information is revealed through sum- and difference-mode processing of the receiving antennae, but with the dual-mode processing implemented at the transmitter side via photonic radio-frequency arbitrary waveform generation. Experiments with a single target demonstrate unambiguous sensing of target angle with an estimated root-mean-square error of 0.18<inline-formula><tex-math notation="LaTeX">^\circ</tex-math></inline-formula> over a <inline-formula><tex-math notation="LaTeX">\pm 4^\circ</tex-math></inline-formula> angular range. We also demonstrate independent sensing of the angles of two targets that are resolved in range.