Results 71 to 80 of about 2,464 (177)

LPI Air Defence Noise Radar [PDF]

, 2023
This dissertation is for researching the feasibility of a Low Probability of Intercept (LPI), Air Defence (AD) Noise Radar with high range and doppler resolution. The research is approached by first simulating an S-Band LPI Noise Radar detecting a flying
Molope, Lazarus Molahlegi
core   +1 more source

Spatially Varying Drivers of Temporal β Diversity in Forest Avian Communities

Ecology and Evolution, Volume 15, Issue 10, October 2025.
Understanding how environmental changes and spatial heterogeneity influence biodiversity is crucial for conservation. Using Ohio Breeding Bird Atlas data and machine learning, we identified elevation variability and forest availability as key drivers of β diversity dissimilarity, with the greatest assemblage changes in areas with high total forest loss
Jess Dong, Stephen N. Matthews, Matthew B. Shumar, William E. Peterman   +3 more
wiley   +1 more source

A Synchronization Approach Based on Bidirectional Correlation Search for Aperiodic Chaotic Direct Sequence Spread Spectrum Signals

IEEE Access, 2020
The chaotic direct sequence spread spectrum (CD3S) is one of the distinguished techniques providing physical layer secrecy and low probability of intercept (LPI) in wireless communication.
Guogang Yuan, Zili Chen, Xijun Gao, Jiangyan He, Hongxia Jia   +4 more
doaj   +1 more source

Bypassing Bribes: Mobile Money and Corruption in Africa

Journal of International Development, Volume 37, Issue 7, Page 1454-1472, October 2025.
ABSTRACT Drawing on a sample of up to 100 000 individuals across 31 African countries, we use repeated cross‐sectional surveys and multilevel regression models to examine how national mobile money activity correlates with individual bribe payments over time.
Ashley Blair Simpson, Zack Zimbalist
wiley   +1 more source

Low probability of intercept (LPI) free-space optical communication with wavelength diversity in strong atmospheric turbulence regime

Optics Express
In physical-layer security and cryptography we are concerned with the security of the transmitted data, while in low probability of intercept (LPI) communication with protecting the privacy of the end users. In our recent publications related to LPI communications and radars over free-space optical (FSO) links we proposed to hide the constant-amplitude
Vijay Nafria, Ivan B. Djordjevic
openaire   +1 more source

Побудова функціонала відношення правдоподібностей для сигналів з розсіяним спектром [PDF]

, 2004
The choise of week periodical functions for spectrum definition of spread spectrum signals is grounded. Harmonizable stochastic processes objected for spectral representation of their analog to digital conversion noises.
Yavorskyy, B. I., Яворський, Богдан Іванович   +1 more
core  

An Improved Polar-Coordinate Navigation System with the Establishment of Electronic Counter-counter Measures Capabilities [PDF]

, 2013
With easy-to-be-disposed architecture and premium navigation performances, polar-coordinate navigationsystem (PCNS) is still widely utilized by modern military navigation systems.
Zhang, Qiang
core   +2 more sources

Intra-pulse Modulation Recognition of LPI Radar Signals Based on Improved MobileNet [PDF]

Radioengineering
Addressing the challenge of feature extraction for Low Probability of Intercept (LPI) radar signals under low signal-to-noise ratio conditions, this study introduces a new method for intra-pulse modulation recognition of LPI radar signals based on an ...
J. Wu, X. Wang, Y. Zhou, B. Chen, W. Li, L. Zhang   +5 more
doaj  

Effect of corruption on perceived difficulties in healthcare access in sub-Saharan Africa [PDF]

, 2019
Background Achieving Universal Health Coverage (UHC) by improving financial protection and effective service coverage is target 3.8 of the Sustainable Development Goals. Little is known, however, about the extent to which paying bribes within healthcare
Hsiao, Amber, Quentin, Wilm, Vogt, Verena   +2 more
core   +1 more source

Synthesis of Population Trends Reveals Seascape‐Wide Reorganisation of Biodiversity From Microalgae to Birds

Global Change Biology, Volume 31, Issue 6, June 2025.
We present a systematic and quantitative analysis of population trends to capture the seascape‐wide reorganisation of biodiversity from microalgae to birds. First, we categorised population trends and found over one third of populations in the Wadden Sea to change, that is, increase or decrease.
Anika Happe, Kasper J. Meijer, Jan‐Claas Dajka, Oscar Franken, Holger Haslob, Laura L. Govers, Michael Kleyer, Annebelle C. M. Kok, Lucie Kuczynski, Kertu Lõhmus, Sancia E. T. van der Meij, Han Olff, Lena Rönn, Alexey Ryabov, Anne F. Sell, David W. Thieltges, Britas Klemens Eriksson, Helmut Hillebrand   +17 more
wiley   +1 more source