Adaptive, Robust, High-Resolution Signal Processing

1990 ◽  
Author(s):  
Donald W. Tufts
Keyword(s):  
Signal Processing ◽  
High Resolution

scholarly journals Photonic RF channelizer based on 49GHz soliton crystal microcombs

2020 ◽  
Author(s):  
David Moss ◽  
Roberto Morandotti ◽  
Arnan Mitchell ◽  
xingyuan xu ◽  
mengxi tan ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Ring Resonator ◽  
Rf Receivers ◽  
High Q ◽  
Monolithically Integrated ◽  
Broadband Radio ◽  
Significant Step ◽  
Multi Wavelength ◽  
Reduced Complexity

We report a broadband radio frequency (RF) channelizer with up to 92 channels using a coherent microcomb source. A soliton crystal microcomb, generated by a 49 GHz micro-ring resonator (MRR), is used as a multi-wavelength source. Due to its ultra-low comb spacing, up to 92 wavelengths are available in the C band, yielding a broad operation bandwidth. Another high-Q MRR is employed as a passive optical periodic filter to slice the RF spectrum with a high resolution of 121.4 MHz. We experimentally achieve an instantaneous RF operation bandwidth of 8.08 GHz and verify RF channelization up to 17.55 GHz via thermal tuning. Our approach is a significant step towards the monolithically integrated photonic RF receivers with reduced complexity, size, and unprecedented performance, which is important for wide RF applications ranging from broadband analog signal processing to digital-compatible signal detection.

scholarly journals Rapid High-Resolution Wavenumber Extraction from Ultrasonic Guided Waves Using Adaptive Array Signal Processing

2018 ◽  
Vol 8 (4) ◽  
pp. 652 ◽  
Author(s):  
Shigeaki Okumura ◽  
Vu-Hieu Nguyen ◽  
Hirofumi Taki ◽  
Guillaume Haïat ◽  
Salah Naili ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Guided Waves ◽  
Array Signal Processing ◽  
Ultrasonic Guided Waves ◽  
Adaptive Array ◽  
Adaptive Array Signal Processing

scholarly journals Recent developments in high-resolution-gamma-ray cargo-inspection technology

2018 ◽  
Vol 48 ◽  
pp. 1860109
Author(s):  
David Taylor ◽  
Victor Orphan ◽  
Eric Ackermann ◽  
Rhett Barnes ◽  
Ryan Shyffer ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Homeland Security ◽  
Gamma Ray ◽  
Imaging System ◽  
Digital Signal ◽  
Department Of Homeland Security ◽  
Legacy System ◽  
Cargo Inspection ◽  
Signal Processing Electronics

Under US Department of Homeland Security sponsorship, Spectral Labs Incorporated has developed a prototype high-resolution retrofit for an existing mobile VACIS, named the High-Resolution Imaging System (HiRIS). The legacy 256 NaI detectors in the VACIS detector column were replaced with 576 CsI detectors, more than doubling the pixel count. Using SiPMs to replace conventional PMTs allowed the packing of more detectors in the same VACIS detector enclosure. Legacy analog signal-processing electronics were replaced with advanced digital signal-processing electronics. Replacing gross counting in the legacy system with multichannel analysis of the counts from each detector will allow better control of detector crosstalk. The HiRIS detector modules were installed on a VACIS truck refurbished to as-new condition. Initial testing of the HiRIS prototype demonstrates enhanced spatial resolution by a factor of two as compared to the legacy system, without any degradation in throughput capability (20 containers per hour).

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