Results 21 to 30 of about 7,002 (201)

Characterization of surface clutter signal in the presence of orography for a spaceborne conically scanning W-band Doppler radar [PDF]

Atmospheric Measurement Techniques
The Earth's surface radar reflection is one of the most important signals received by spaceborne radar systems. It is used in several scientific applications, including geolocation, terrain classification, and path-integrated attenuation estimation.
F. Manconi, A. Battaglia, A. Battaglia, P. Kollias, P. Kollias   +4 more
doaj   +1 more source

Doppler radar calibration system

IEEE Aerospace and Electronic Systems Magazine, 2012
The developed prototype has proved to be a useful instrument for the calibration of Doppler/range radars. The system includes innovative solutions for the generation of Doppler and distances with high precision. It is able to generate accurate Doppler shifts with a resolution higher than 4·10 -3 Hz and speeds with an accuracy of around ±2.76 ppm - from
Fernández Fernández, Jean Raphael Olivier, Briso Rodriguez, César, Calvo Gallego, Jaime, Burgos García, Mateo, Pérez Martínez, Félix, Araña Pulido, Víctor Alexis   +5 more
openaire   +3 more sources

Doppler spectra from DWD's operational C-band radar birdbath scan: sampling strategy, spectral postprocessing, and multimodal analysis for the retrieval of precipitation processes [PDF]

Atmospheric Measurement Techniques, 2022
This study explores the potential of using Doppler (power) spectra from vertically pointing C-band radar birdbath scans to investigate precipitating clouds above the radar. First, the new birdbath scan strategy for the network of dual-polarization C-band
M. Gergely, M. Schaper, M. Toussaint, M. Frech   +3 more
doaj   +1 more source

FDA-MIMO Radar Moving Target Detection Based on Doppler Spread Compensation

Leida xuebao, 2022
When Frequency Diverse Array and Multiple-Input Multiple-Output (FDA-MIMO) radar detects moving targets, the frequency offset between transmitting arrays is coupled with the target velocity, resulting in severe Doppler spread in the slow time dimension ...
Shunsheng ZHANG, Meihui LIU, Wenqin WANG
doaj   +1 more source

A Doppler Radar System for Sensing Physiological Parameters in Walking and Standing Positions

Sensors, 2017
Doppler radar can be implemented for sensing physiological parameters wirelessly at a distance. Detecting respiration rate, an important human body parameter, is essential in a range of applications like emergency and military healthcare environments ...
Malikeh Pour Ebrahim, Majid Sarvi, Mehmet Rasit Yuce   +2 more
doaj   +1 more source

Modification of reconstruction threshold algorithm in two-dimensional LFMCW compressive radar

Journal of Electrical Systems and Information Technology, 2022
Nowadays, the Compressive Sensing theory has an important effect on many communication system’s performances, and one of these applications is the radar system.
Sameh Ghanem
doaj   +1 more source

A new method for Synthetic Impulse and Aperture Radar transmitting waveform design based on non‐sequential positive, negative and random carrier frequency coding with dot product approach

IET Radar, Sonar & Navigation, 2022
Synthetic Impulse and Aperture Radar (SIAR) is a kind of Multiple Input Multiple Output (MIMO) radar. It is a four‐dimensional radar that has advantages against stealth targets, multi targets, anti‐radiated missile, reconnaissance and interference, as ...
Pourya Yaghoubi Aliabad, Hossein Soleimani, Mohammad Soleimani   +2 more
doaj   +1 more source

Imaging observations of nighttime mid-latitude F-region field-aligned irregularities by an MU radar ultra-multi-channel system [PDF]

Annales Geophysicae, 2008
Mid-latitude F-region field-aligned irregularities (FAIs) were studied by using the middle-and-upper atmosphere (MU) radar ultra-multi-channel system with the radar imaging technique.
S. Saito, S. Saito, M. Yamamoto, H. Hashiguchi   +3 more
doaj   +1 more source

Moving target detection in clutter background with FDA-MIMO radar via three-dimensional focus processing

The Journal of Engineering, 2019
Low observable moving target-detection technology under clutter background is the key factor affecting the radar performance. Here, frequency diverse array (FDA) MIMO radar is investigated for low-observable moving target detection.
Xiaolong Chen, Yonghua Xue, Yonghua Xue, Baoxin Chen, Yong Huang, Jian Guan   +5 more
doaj   +1 more source

Space‐Time Metasurface Antenna Enabled High‐Dimensional Electromagnetic Modulation for Intrinsic Physical Layer Security

Advanced Science, EarlyView.
The concept of high‐dimensional EM modulation using the STMA for physical layer secure communication is illustrated in figure. The STMA consists of a series of programmable unit cells, with 1‐bit reconfigurable phase states (0/π). The STMA is excited by a monochromatic continuous wave (CW) at frequency fc and controlled by a field‐programmable gate ...
Xinyu Fang, Yiqing Sun, Chenfeng Yang, Siran Wang, Zheng Xing Wang, Kaixu Wang, Geng‐Bo Wu   +6 more
wiley   +1 more source