Results 1 to 10 of about 399,303 (277)

Spectroscopic Links among Giant Planet Irregular Satellites and Trojans [PDF]

open access: yesThe Planetary Science Journal, 2023
We collect near-infrared spectra (∼0.75–2.55 μ m) of four Jovian irregular satellites and visible spectra (∼0.32–1.00 μ m) of two Jovian irregular satellites, two Uranian irregular satellites, and four Neptune Trojans.
Benjamin N. L. Sharkey   +4 more
doaj   +3 more sources

Optimization in VHTS Satellite System Design with Irregular Beam Coverage for Non-Uniform Traffic Distribution

open access: yesRemote Sensing, 2021
Very High Throughput Satellites (VHTS) have a pivotal role in complementing terrestrial networks to increase traffic demand. VHTS systems currently assume a uniform distribution of traffic in the service area, but in a real system, traffic demands are ...
Flor G. Ortiz-Gomez   +3 more
doaj   +3 more sources

States' Responsibility to Operate Small Satellites in International Space Law [PDF]

open access: yesفصلنامه علوم و فناوری فضایی, 2021
Many of the space applications that previously required the use of large, complex and expensive satellites have now been made possible by very small satellites due to the development of technology. The applicable international laws and regulations, which
Hamid Kazemi
doaj   +1 more source

The influence the horizontal structure of the forest on the passing the L1 range of navigation satellites signals [PDF]

open access: yesE3S Web of Conferences, 2021
Experimental data on the passing of signals from navigation satellites of the L1 range through forest plantations with an anisotropic horizontal tree arrangement structure are presented.
Sorokin Anatoly   +4 more
doaj   +1 more source

Irregular Layout for a Satellite’s Interferometric Array

open access: yesIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021
We address the optimization problem of antenna placement on satellite-mounted interferometric synthetic-aperture instruments. In classic designs, the antennas on satellites are aligned regularly on the satellite’s frame.
Paul Krzakala   +10 more
doaj   +1 more source

A Scheduling Method of Using Multiple SAR Satellites to Observe a Large Area

open access: yesSensors, 2023
This paper presents a scheduling problem of using multiple synthetic aperture radar (SAR) satellites to observe a large irregular area (SMA). SMA is usually considered as a kind of nonlinear combinatorial optimized problem and its solution space strongly
Qicun Zheng   +3 more
doaj   +1 more source

Analysis of a Simulated Optical GSO Survey Observation for the Effective Maintenance of the Catalogued Satellites and the Orbit Determination Strategy [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2015
A strategy is needed for a regional survey of geosynchronous orbits (GSOs) to monitor known space objects and detect uncataloged space objects. On the basis of the Inter-Agency Debris Committee’s recommendation regarding the protected region of ...
Jin Choi   +8 more
doaj   +1 more source

Design and Analysis of CubeSat Microwave Radiometer Constellations to Observe Temporal Variability of the Atmosphere

open access: yesIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021
Passive microwave satellite observations provide critical information for global forecast models, particularly in cloudy and/or precipitating conditions.
Yuriy V. Goncharenko   +4 more
doaj   +1 more source

Informal settlements in Baghdad city [PDF]

open access: yesE3S Web of Conferences, 2021
The research deals with the issue of slums, urban sprawl on agriculture land and its impact on the city of Baghdad. This topic needs close attention because it has become a problem facing the city of Baghdad through recruiting agricultural lands and ...
Repeva Anastasia
doaj   +1 more source

Method of determining the coordinates of the radio signal source in satellite communication systems

open access: yesКосмические аппараты и технологии, 2023
Telecommunications have penetrated deeply into all spheres of human activity. Due to the use of digital technologies, it has become possible to transmit and receive information of various kinds in one stream (not separately).
R. S. Blumberg   +2 more
doaj   +1 more source

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