Results 31 to 40 of about 820,012 (137)
JAWRA Journal of the American Water Resources Association, Volume 62, Issue 1, February 2026.ABSTRACT Arizona, located in the Desert Southwest of the U.S., faces chronic water scarcity and has been strongly affected by the multidecadal Millennium Drought. As the state increasingly turns to water augmentation strategies, accurate, high‐resolution estimates of water balance components are essenctial.
Abdul Moiz, Giuseppe Mascaro
wiley +1 more source
The First Results of Ionospheric Skywave Propagation Experiment Over Taiwan
Radio Science, Volume 61, Issue 1, January 2026.Abstract An ionospheric over‐the‐horizon propagation experiment was carried out in Taiwan to investigate characteristics of ionospheric F layer skywave propagation at frequencies 4–12 MHz. Experimental results show that there are prominent diurnal variations in the incident angle, virtual height and plasma frequency at reflection height, which are ...
Hung‐Shi Lin +3 more
wiley +1 more source
Time Synchronisation for Passive Bistatic HFSWR via Kalman‐Filtered Delay‐Locked Loop
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.This paper proposes a per‐chirp time synchronisation method, FLOS‐Kalman‐DLL, for passive bistatic high‐frequency surface wave radar (HFSWR) operating under the coexistence of clock drift and atmospheric impulsive noise. The method combines fractional lower‐order statistics with a Kalman‐filtered delay‐locked loop to achieve sub‐sample synchronisation ...
Yuan Lu, Jie Song, Wei Xiong, Yaqi Cui
wiley +1 more source
Ambiguity and area preserving linear transformations in over‐the‐horizon radar
IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.The use of recurrent waveforms in over‐the‐horizon radar (OTHR) necessitates techniques for ambiguity resolution and manipulation. In this paper, the authors elucidate methods for systematically transforming any given waveform so that its ambiguity function is transformed by any desired area preserving the linear transformation of the delay‐Doppler ...
Stephen D. Howard, Van Khanh Nguyen
wiley +1 more source
Transmit And Receive Antenna Array Geometries For Mode Selective Hf Oth Mimo Radar
, 2010 Publication in the conference proceedings of EUSIPCO, Aalborg, Denmark ...
Yuri I. Abramovich +2 more
openaire +3 more sources
Over-the-horizon aircraft detection using skywave AM-radio broadcast signals
, 2015 We present the preliminary experimental results of a collaborative research project to determine the feasibility of using AM-radio broadcasts of opportunity for aircraft detection at ranges of thousands of kilometers from a terrestrial receiver.
Ng, B. +4 more
core +1 more source
Mapping ionospheric backscatter measured by the SuperDARN HF radars - part 2: Assessing SuperDARN virtual height models [PDF]
, 2008 The Super Dual Auroral Radar Network (SuperDARN) network of HF coherent backscatter radars form a unique global diagnostic of large-scale ionospheric and magnetospheric dynamics in the northern and southern hemispheres.
T. R. Robinson (7590257) +24 more
core +2 more sources
On the Use of SuperDARN Ground Backscatter Measurements for Ionospheric Propagation Model Validation
Space Weather, Volume 22, Issue 9, September 2024.Abstract Prior to use in operational systems, it is essential to validate ionospheric models in a manner relevant to their intended application to ensure satisfactory performance. For Over‐the‐Horizon radars (OTHR) operating in the high‐frequency (HF) band (3–30 MHz), the problem of model validation is severe when used in Coordinate Registration (CR ...
Joshua J. Ruck +6 more
wiley +1 more source
Geophysical Research Letters, Volume 51, Issue 16, 28 August 2024.Abstract Monitoring the generation and movement of equatorial plasma bubbles (EPBs) in a large longitude region is crucial important for better understanding their day‐to‐day variability. Using the newly developed Low lAtitude long Range Ionospheric raDar (LARID) at Dongfang (19.2°N, 108.8°E, dip lat.
Lianhuan Hu +11 more
wiley +1 more source
High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter [PDF]
, 2004 International audienceThe EISCAT high power heating facility at Tromsø, northern Norway, has been utilised to generate artificial radar backscatter in the fields of view of the CUTLASS HF radars.
Woodfield, E.E. +30 more
core +2 more sources