Results 71 to 80 of about 2,719,974 (280)

On The Identification of Low Probability of Intercept Radar Signals using Time-Frequency Signal Analysis and Processing [PDF]

Journal of Electrical and Electronics Engineering, 2019
Low probability of intercept (LPI) radar signals are gaining recognition in the field of electronic warfare (EW) due to their unique characteristics. This paper presents an alternative method of analyzing and identifying these LPI signals using Wigner ...
AHMAD Ashraf Adamu, AJIYA Mohammed, YUSUF Zainab Yunusa, AIROBOMAN Abel Ehimen   +3 more
doaj  

Predicting pup‐rearing habitat for Mexican wolves

The Journal of Wildlife Management, EarlyView.
We developed predictive models of pup‐rearing habitat (i.e., den and rendezvous sites) that could help guide future population monitoring efforts of Mexican wolves. Mexican wolves selected den sites at higher elevations in steeper and rougher terrain that was closer to permanent waterbodies but farther from rural roads, whereas selection of rendezvous ...
Sarah B. Bassing, John K. Oakleaf, James W. Cain III, Allison R. Greenleaf, Colby M. Gardner, David E. Ausband   +5 more
wiley   +1 more source

Quantifying range‐ and topographical biases in weather surveillance radar measures of migratory bird activity

Remote Sensing in Ecology and Conservation, EarlyView.
We compared local density measures of migratory birds collected using a mobile, vertically looking radar with reflectivity from a Next Generation Weather Radar (NEXRAD) station across varying distances and topographies. Broadly, mean nightly migration activity and within night migration activity between NEXRAD and the mobile radar were strongly ...
Miguel F. Jimenez, Birgen Haest, Ali Khalighifar, Annika L. Abbott, Abigail Feuka, Aitao Liu, Kyle G. Horton   +6 more
wiley   +1 more source

LPI Radar Signals Modulation Recognition Based on ACDCA-ResNeXt

IEEE Access, 2023
For low probability of intercept (LPI) radar waveform identification accuracy (ACC) problem at low Signal-to-Noise Ratios (SNRs), an approach based on time-frequency analysis (TFA) and Asymmetric Dilated Convolution Coordinate Attention Residual networks
Xudong Wang, Guiguang Xu, He Yan, Daiyin Zhu, Ying Wen, Zehu Luo   +5 more
doaj   +1 more source

Identifying Coordination in a Cognitive Radar Network -- A Multi-Objective Inverse Reinforcement Learning Approach [PDF]

arXiv, 2022
Consider a target being tracked by a cognitive radar network. If the target can intercept some radar network emissions, how can it detect coordination among the radars? By 'coordination' we mean that the radar emissions satisfy Pareto optimality with respect to multi-objective optimization over each radar's utility.
arxiv  

White noise jammer mathematical modelling and simulation [PDF]

, 2020
The radar equation is the fundamental mathematical modelling of the basic function of a radar system. Moreover there are many versions of the radar equation that correspond to particular radar operations, like a low PRF, a high PRF or a surveillance mode.
arxiv   +1 more source

Detection Strategies and Intercept Metrics for Intra-Pulse Radar-Embedded Communications [PDF]

, 2011
This thesis presents various detection strategies and intercept metrics to evaluate and design an intra-pulse radar-embedded communication system. This system embeds covert communication symbols in masking interference provided by the reflections of a ...
Metcalf, Justin
core  

Red pandas on the move: weather and disturbance effects on habitat specialists

Wildlife Biology, EarlyView.
Challenging weather events can make winters harsh for habitat and diet specialists. They may also incur high energetic costs due to reduced availability of food resources and elevated predation risk. Using GPS satellite collars we tracked the movement of the red panda Ailurus fulgens in the Himalayas, and evaluated the effects of weather and ...
Damber Bista, Greg S. Baxter, Nicholas J. Hudson, Sonam Tashi Lama, Janno Weerman, Peter J. Murray   +5 more
wiley   +1 more source

Radar Selection Method Based on an Improved Information Filter in the LPI Radar Network

International Journal of Antennas and Propagation, 2018
In order to save the radar resources and obtain the better low probability intercept ability in the network, a novel radar selection method for target tracking based on improved interacting multiple model information filtering (IMM-IF) is presented ...
Zhenkai Zhang, Bing Zhang, Zhibin Xie, Yi Yang   +3 more
doaj   +1 more source

Coalition Game Theoretic Power Allocation Strategy for Multi-Target Detection in Distributed Radar Networks

Remote Sensing, 2023
This paper studies a coalition game theoretic power allocation algorithm for multi-target detection in radar networks based on low probability of intercept (LPI).
Xiangrong Dai, Chenguang Shi, Ziwei Wang, Jianjiang Zhou   +3 more
doaj   +1 more source