Results 71 to 80 of about 2,448 (172)

Cognitive MIMO Frequency Diverse Array Radar with High LPI Performance

International Journal of Antennas and Propagation, 2016
Frequency diverse array (FDA) has its unique advantage in realizing low probability of intercept (LPI) technology for its dependent beam pattern. In this paper, we proposed a cognitive radar based on the frequency diverse array multiple-input multiple ...
Ling Huang, Kuandong Gao, Zhiming He, Jingye Cai   +3 more
doaj   +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

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  

Assessment of digital platforms for the quantification of co‐benefits in nature‐based solutions

Sustainable Development, Volume 33, Issue 2, Page 2137-2153, April 2025.
Abstract The significance of Nature‐Based Solutions (NBSs) in addressing environmental and socioeconomic challenges is widely acknowledged, yet research on NBSs continues due to a limited understanding of their full benefits. This study addresses the existing gap by focusing on NBS co‐benefit valuation through digital platforms. These platforms support
Mahdieh Raji, Beulah Evelyn Lazarus, Naga Venkata Sudha Rani Nalakurthi, Ananya Tiwari, Salem Gharbia   +4 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

Analysis of Multimode Low-Probability-of-Intercept (LPI) Communications with Atmospheric Effects [PDF]

, 1996
This research expanded Low Probability of Intercept (LPI) communications analysis in two areas. First, multimode communication was included to account for ground to ground and air to ground links in addition to the standard air to air links traditionally
Ghordlo, Ala
core   +1 more source

Pre‐Fire Vegetation Conditions and Topography Shape Burn Mosaics of Siberian Tundra Fire Scars

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 3, March 2025.
Abstract The fire season of 2020 in Siberia set a precedent for extreme wildfires in the Arctic tundra. Recent estimates indicated that the 2020 fires contributed 66% of the region's burned area over the last two decades. These fires burned in the carbon‐rich permafrost landscape, releasing vast amounts of carbon, and changing land surface processes by
N. Rietze, R. J. Heim, E. Troeva, G. Schaepman‐Strub, J. J. Assmann   +4 more
wiley   +1 more source

LPI Sequences Optimization Method against Summation Detector Based on FFT Filter Bank

Remote Sensing
Waveform design is a crucial factor in electronic surveillance (ES) systems. In this paper, we introduce an algorithm that designs a low probability of intercept (LPI) radar waveform. Our approach directly minimizes the detection probability of summation
Qiang Liu, Fucheng Guo, Kunlai Xiong, Zhangmeng Liu, Weidong Hu   +4 more
doaj   +1 more source

Antenna Array Beamforming for Low Probability of Intercept Radars [PDF]

, 2013
A radar system's focus on low probability of intercept (LPI) performance has become increasingly important as systems designed for electronic support measures (ESM) and electronic counter measures (ECM) continue to become more prevalent.
Goad, Daniel
core  

Performance of direct-oversampling correlator-type receivers in chaos-based DS-CDMA systems over frequency non-selective fading channels [PDF]

, 2017
In this paper, we present a study on the performance of direct-oversampling correlator-type receivers in chaos-based direct-sequence code division multiple access systems over frequency non-selective fading channels.
Barlet Ros, Pere, Nguyen, Xuan Quyen
core   +2 more sources