Results 91 to 100 of about 23,415 (245)
Journal of Geophysical Research: Atmospheres, Volume 130, Issue 23, 16 December 2025.Abstract Vertical air motion is a key factor in many meteorological phenomena, yet measuring it remains challenging. VHF Stratosphere‐Troposphere radars, however, provide methods to measure vertical air velocities (W) $W)$ in the tropo‐stratosphere. From Middle and Upper (MU) atmosphere radar data spanning 38 years (1987–2024), we found that the well ...
Hubert Luce +2 more
wiley +1 more source
Tropospheric Propagation Effects Extracted From ADS‐B Messages
Engineering Reports, Volume 7, Issue 12, December 2025.This study explores the use of ADS‐B messages to estimate tropospheric effects, effectively isolating atmospheric influences from interference. The approach enables independent lower atmosphere studies and offers a cost‐free supplementary method for satellite applications, benefiting GNSS systems, especially at low elevation angles where multipath and ...
Alina‐Mihaela Badescu
wiley +1 more source
The Journal of Engineering, 2019 A signal processing method of passive bistatic radar using non-cooperative pulse radar illuminators is proposed. The proposed method estimates unknown parameters of transmitting radar signal from direct-path signal, and uses estimated parameters for ...
Song Jie +3 more
doaj +1 more source
Empirical Comparison of Chirp and Multitones on Experimental UWB Software Defined Radar Prototype [PDF]
, 2012 This paper proposes and tests an approach for an unbiased study of radar waveforms' performances. Using the ultrawide band software defined radar prototype, the performances of Chirp and Multitones are compared in range profile and detection range.
Denoulet, J. +3 more
core
Three-step ground moving target detection method for bistatic forward-looking SAR
The Journal of Engineering, 2019 Detecting ground moving target in bistatic forward-looking synthetic aperture radar (BFSAR) has become increasingly important in military and civil field. Compared with pulse Doppler radar, the long observation time and high resolution of BFSAR will lead
Zhutian Liu +5 more
doaj +1 more source
C-band radar pulse Doppler error: Its discovery, modeling, and elimination [PDF]
The discovery of a C Band radar pulse Doppler error is discussed and use of the GEOS 3 satellite's coherent transponder to isolate the error source is described. An analysis of the pulse Doppler tracking loop is presented and a mathematical model for the
Dempsey, D. J., Krabill, W. B.
core +1 more source
Investigations of the lower and middle atmosphere at the Arecibo Observatory and a description of the new VHF radar project [PDF]
, 1986 The atmospheric science research at the Arecibo Observatory is performed by means of (active) radar methods and (passive) optical methods. The active methods utilize the 430 NHz radar, the S-band radar on 2380 MHz, and a recently constructed Very High ...
Hagen, J. +3 more
core +1 more source
Micro-Doppler Signal Time-Frequency Algorithm Based on STFRFT
Sensors, 2016 This paper proposes a time-frequency algorithm based on short-time fractional order Fourier transformation (STFRFT) for identification of a complicated movement targets. This algorithm, consisting of a STFRFT order-changing and quick selection method, is
Cunsuo Pang +4 more
doaj +1 more source
Doppler Tolerance, Complementary Code Sets and the Generalized Thue-Morse Sequence [PDF]
, 2014 We generalize the construction of Doppler-tolerant Golay complementary waveforms by Pezeshki-Calderbank-Moran-Howard to complementary code sets having more than two codes.
Coxson, Greg E., Nguyen, Hieu D.
core +2 more sources
Development of a radar simulator for monitoring wake vortices in rainy weather [PDF]
, 2011 A simulator for the evaluation of the radar signature of raindrops within wake vortices is presented. Simulated Doppler spectrum of raindrops within vortices let to think that it could be a potential criterion for identifying wake vortex hazard in ...
Jeannin, Nicolas +3 more
core