Results 71 to 80 of about 13,113 (202)

Coherence Cloning Using Semiconductor Laser Optical Phase-Lock Loops [PDF]

, 2009
We demonstrate the concept of coherence cloning where the coherence properties of a high-quality spectrally stabilized fiber laser are transferred to a commercially available high-power DFB semiconductor laser (SCL) using an optical phase-lock loop.
Liang, Wei, Satyan, Naresh, Yariv, Amnon
core   +1 more source

A Linear Active Rampart Antenna Array With Two‐Dimensional Beam‐Scanning Capability for FMCW Radar Applications

International Journal of Antennas and Propagation, Volume 2026, Issue 1, 2026.
A novel linear active rampart array that is able to steer in the azimuth plane through frequency sweeping and in the elevation plane through phase shifting has been developed. The presented system uses eight active elements and two parasitic ones to ensure consistent radiation patterns.
Tudor Ioan Popa, Gabriele Federico, A. Bart Smolders, Diego Caratelli, Chien-Jen Wang   +4 more
wiley   +1 more source

Design Considerations for Integrated Radar Chirp Synthesizers

IEEE Access, 2019
Phase-locked loops (PLLs) effectively generate frequency chirps for frequency-modulated continuous-wave (FMCW) radar and are ideal for integrated circuit implementations.
Daniel Weyer, Mehmet Batuhan Dayanik, Lu Jie, Ahmed Albalawi, Abdulhamed Alothaimen, Mohammed Aseeri, Michael P. Flynn   +6 more
doaj   +1 more source

New Design Antenna and Optimization of S‐Band Radar Networks Using CSRR Technology

International Journal of RF and Microwave Computer-Aided Engineering, Volume 2026, Issue 1, 2026.
In this paper, a new design and analysis of a highly compact metamaterial antenna array for radar applications operating in the S‐band (2–4 GHz) is presented. To enhance the electrical and radiation characteristics of the proposed antenna, a slot was introduced into the radiating element, and a novel power divider was employed.
Hamza Ben Hamadi, Said Riahi, Said Ghnimi, Ridha Ghayoula, Ali Gharsallah, R. K. Mishra   +5 more
wiley   +1 more source

The Role of Millimeter-Waves in the Distance Measurement Accuracy of an FMCW Radar Sensor

Sensors, 2019
High-accuracy, short-range distance measurement is required in a variety of industrial applications e.g., positioning of robots in a fully automated production process, level measurement of liquids in small containers.
Akanksha Bhutani, Sören Marahrens, Michael Gehringer, Benjamin Göttel, Mario Pauli, Thomas Zwick   +5 more
doaj   +1 more source

Backscatter Transponder Based on Frequency Selective Surface for FMCW Radar Applications [PDF]

, 2014
This paper describes an actively-controlled frequency selective surface (FSS) to implement a backscatter transponder. The FSS is composed by dipoles loaded with switching PIN diodes. The transponder exploits the change in the radar cross section (RCS) of
Girbau, D., Lazaro, A., Lorenzo, J., Villarino, R.   +3 more
core   +1 more source

What's Next for Snow: Insights From the NASA Terrestrial Hydrology Program Community Snow Meeting

Earth's Future, Volume 13, Issue 12, December 2025.
Abstract Earth's snow cover strongly influences the climate system and represents an important resource for agricultural, industrial, and domestic water use. The last decade of snow‐focused research has improved our understanding of snow across scales. These efforts have culminated in new snow measurement instruments and methods, operational models for
Kate Hale, Joachim Meyer, Jack Tarricone, Carrie Vuyovich, Megan Mason, Hans‐Peter Marshall, Keith N. Musselman, Noah P. Molotch, Rashmi Shah, Shadi Oveisgharan   +9 more
wiley   +1 more source

Multiple source frequency-modulated continuous-wave optical reflectometry: theory and experiment [PDF]

, 2010
We propose and demonstrate a novel approach to increase the effective bandwidth of a frequencymodulated continuous-wave (FMCW) ranging system. This is achieved by algorithmically stitching together the swept spectra of separate laser sources.
Rakuljic, George, Satyan, Naresh, Vasilyev, Arseny, Xu, Shengbo, Yariv, Amnon   +4 more
core   +1 more source

A FMCW-FSK Combined Waveform for Multi-Target Detection in FMCW Radar

DEStech Transactions on Computer Science and Engineering, 2017
Frequency modulated continuous wave (FMCW) radar has been widely applied in many fields. Modulated waveform is usually designed to solve the coupling problem of range and velocity in multi-target situation. A FMCW-FSK combined waveform is proposed in this work, which takes the advantages of FMCW waveform and FSK waveform.
TAO SHEN, WENQUAN CHE, KUAN DENG, WENJIE FENG   +3 more
openaire   +2 more sources

Leveraging Sparse Autoencoders to Reveal Interpretable Features in Geophysical Models

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.
Abstract Machine learning is an increasingly popular tool in the geosciences, offering new approaches to numerical weather prediction and complex data set analysis. However, as reliance on these techniques grows, pressing questions about model transparency, internal biases, and trust emerge.
Fraser King, Claire Pettersen, Derek Posselt, Sarah Ringerud, Yan Xie   +4 more
wiley   +1 more source