Results 81 to 90 of about 4,643 (194)

Space-time Characteristics and Experimental Analysis of Broadening First-order Sea Clutter in HF Hybrid Sky-surface Wave Radar [PDF]

, 2014
In high frequency (HF) hybrid sky-surface wave radar, the first-order sea clutter broadening is very complex and serious under the influence of ionosphere and bistatic angle, which affects the detection of ship target.
Chu, T.Q., Li, Y.J., Wang, Z.Q., Wei, Y.S., Xu, R.Q.   +4 more
core   +1 more source

Analysis, Testing, and Design of a UHF and HF Peer‐to‐Peer Communication System for the Europan Cryosphere

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract This study presents a validated design of a dual‐band wireless relay system of “pucks” for through‐ice communication between a cryobot and a surface lander during a future exploration of the Europan cryosphere. The design of a terrestrial demonstration system and the results of a 103 m through‐ice system test in a relevant environment near ...
Jake Sahli, Albin J. Gasiewski, William C. Stone, Brian Pease, Veronica Guerrero, Vickie Siegel, Justin Smith   +6 more
wiley   +1 more source

Forward scatter radar for air surveillance: Characterizing the target-receiver transition from far-field to near-field regions [PDF]

, 2017
A generalized electromagnetic model is presented in order to predict the response of forward scatter radar (FSR) systems for air-target surveillance applications in both far-field and near-field conditions.
Comite, Davide, Falconi, Marta Tecla, Galli, Alessandro, Lombardo, Pierfrancesco, Marzano, FRANK SILVIO, Pastina, Debora   +5 more
core   +2 more sources

Cosmic Rays and the Askaryan Effect Reveal Subsurface Structure and Buried Ice on the Moon

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract We present the first full‐wavelength numerical simulations of the electric field generated by cosmic ray impacts into the Moon. Billions of cosmic rays fall onto the Moon every year. Ultra‐high energy cosmic ray impacts produce secondary particle cascades within the regolith and subsequent coherent, wide‐bandwidth, linearly‐polarized radio ...
E. S. Costello, R. R. Ghent, A. Romero‐Wolf, P. W. Gorham, P. G. Lucey, C. J. Tai Udovicic, P. Linton, A. Ludwig, K. McBride, C. Miki, E. Oberla, J. Rolla, A. Jung   +12 more
wiley   +1 more source

Experimental investigation on target detection and tracking in passive radar using long-term evolution signal [PDF]

, 2016
This study examines the feasibility of the recently deployed wireless communication system, namely, long-term evolution (LTE), for passive radar applications.
Abdul Aziz, Nor Hafizah, Abdul Rashid, Nur Emileen, Hashim, Fazirulhisyam, Ismail, Alyani, Raja Abdullah, Raja Syamsul Azmir, Salah, Asem A.   +5 more
core   +1 more source

A New Age of SAR: How Can Commercial Smallsat Constellations Contribute to NASA's Surface Deformation and Change Mission?

Earth and Space Science, Volume 12, Issue 1, January 2025.
Abstract In response to the 2017 Decadal Survey, NASA conducted a five‐year study on the Surface Deformation and Change (SDC) designated observable to study potential mission concepts. As part of the SDC mission study, the Commercial Synthetic Aperture Radar (ComSAR) subgroup was tasked with evaluating the current landscape of the SAR and ...
Stacey A. Huang, Batuhan Osmanoğlu, Bernd Scheuchl, Shadi Oveisgharan, Jeanne M. Sauber, MinJeong Jo, Ala Khazendar, Ekaterina Tymofyeyeva, Betsy Wusk, Arif Albayrak   +9 more
wiley   +1 more source

Maritime Moving Target Indication Using Passive GNSS-Based Bistatic Radar [PDF]

IEEE Transactions on Aerospace and Electronic Systems, 2018
This paper is a first introduction to the concept of using global navigation satellite systems (GNSS) as illuminators of opportunity in a passive bistatic real-time radar system for maritime target indication applications. An overview of the system concept and the signal processing algorithms for moving target indication is provided.
Ma, H., Antoniou, M., Pastina, D., Santi, F., Pieralice, F., Bucciarelli, M., Cherniakov, M.   +6 more
openaire   +1 more source

A New Taxonomy for Symbiotic EM Sensors

, 2017
It is clear that the EM spectrum is now rapidly reaching saturation, especially for frequencies below 10~GHz. Governments, who influence the regulatory authorities around the world, have resorted to auctioning the use of spectrum, in a sense to gauge the
Inggs, Michael, Mishra, Amit
core   +2 more sources

Structural Antennas for 3cm Radar Onboard Multi-Rotor UAV [PDF]

, 2017
A series of 3cm amateur band radar antennas suitable for installation on a cinematic grade multi-rotor UAV were considered. A wideband open waveguide mouth antenna was developed that can be made from the existing arms of a multi-rotor UAV without any ...
Gray, D., Le Kernec, J.
core   +1 more source

Adaptive Moving Target Detection for Forward Scatter Radar When the Noise Power Mismatch Occurs

Electronics Letters, Volume 61, Issue 1, January/December 2025.
1. The problem of detecting moving targets with forward scatter radar is discussed. 2. The noise power mismatch, namely, the noise power in the secondary data and the noise power in the primary data differing by a noise‐scaling factor, is considered. 3.
Xiang Li, Zeyu Wang
wiley   +1 more source