Results 71 to 80 of about 1,015,748 (173)
Remote SensingIn this article, we propose a joint waveform based on universal filtered multicarrier (UFMC) chirp for radar jamming and communication joint systems. Modulation of radar jamming chirp signals and communication signals on different subcarrier groups in ...
Gaogao Liu +4 more
doaj +1 more source
International Journal of Climatology, EarlyView.Extreme precipitation trends detected in Paraná, Southern Brazil (1983–2024), are strongly conditioned by the dataset used, with reanalyses indicating coherent inland drying and longer dry spells, observations retaining stronger mesoscale heterogeneity, and satellite products often showing declines in short‐duration extremes. Monthly diagnostics reveal
Paulo Miguel de Bodas Terassi +2 more
wiley +1 more source
Coding and Coherent Decoding techniques for Continuous Single Slope Cyclic Shift Chirp Signal [PDF]
Radioengineering, 2023 Chirp signals are currently widely used in broadband and spread spectrum communications due to their advantageous features, such as immunity to fading noise, low power consumption, consistent long-range transmission, and constant bandwidth.
L. Kirasamuthranon +2 more
doaj
Complex signals based on short chirp signals and phase coding [PDF]
, 2005 The main problem associated with detecting and locating of objects by means of radiolocation and hydrolocation systems is the appropriate selection of transmitting signals. These signals need to be difficult to detect by the watched object and need to be
Marciniak, T.
core
Climatology of Tropical Cyclones Approaching Tanzania and Their Impacts on Rainfall in East Africa
International Journal of Climatology, EarlyView.Tropical cyclones (TCs) that approach Tanzania bring heavy rainfall over northern Mozambique, Tanzania, and south‐central Kenya, but the occurrence of these TCs reduces precipitation over southern African countries. Easterly steering winds and the Mascarene High are key features directing TCs westward.
Michinori Ideyoshi, Youichi Kamae
wiley +1 more source
ENSO or the Atlantic: Which Actually Governs the Hydrological Vulnerability of the Caatinga?
International Journal of Climatology, EarlyView.This study challenges the traditional ENSO‐centric paradigm of rainfall variability in the Caatinga by demonstrating that the Tropical Atlantic exerts a statistically dominant influence on regional hydrological vulnerability. Using a seasonal ARX/HAC model and CHIRPS data, we establish a new hierarchy of climatic drivers across six rainfall districts ...
Jonathan Antunes Ponte Cavalcante Leite +3 more
wiley +1 more source
New MSFCSK-Chirp modulation scheme to improve transmission efficiency
Tongxin xuebaoChirp modulation, due to its unique linear frequency modulation method, has become a key technology adopted by the physical layer of low-power wide-area network (LPWAN).
Xiu Menglei, Dou Gaoqi, Liu Chunkai
doaj
Land Degradation &Development, EarlyView.ABSTRACT Soil erosion remains a major environmental challenge in Nigeria, driven by the combined effects of climate variability and land use/land cover (LULC) changes. Understanding future dynamics is essential for effective soil conservation planning.
Titus Adeyemi Alonge +3 more
wiley +1 more source
, 2012 This thesis investigates all-optical signal processing using cascaded quadratic nonlinearities in periodically poled lithium niobate (PPLN) waveguides for telecommunication applications.
Liu, Sheng
core +1 more source
Land Degradation &Development, EarlyView.ABSTRACT Maize (Zea mays L.) is strategically important in Iran, yet its cultivation in the semi‐arid Zagros is constrained by limited and variable water, heat stress and heterogeneous soils, while conventional suitability assessments are deterministic, rarely validated spatially and provide no measure of confidence.
Ahad Madani, Narges Shafaei Bajestani
wiley +1 more source