Results 151 to 160 of about 107,269 (181)

Wide-swath altimetry maps bank shapes and storage changes in global rivers. [PDF]

Nature
Cerbelaud A, Wade J, David CH, Durand M, Frasson RPM, Pavelsky T, Oubanas H.   +6 more
europepmc   +1 more source

A Decoupled Doppler Positioning Algorithm for Dynamic Receivers Using LEO Constellation Signals. [PDF]

Sensors (Basel)
Liu T, Liu Y, Wen C, Jiang Y, Wang L, Yang R, Yi J.   +6 more
europepmc   +1 more source

Novel design of a dual-band microstrip antenna array for 6G mmWave applications.

Sci Rep
Al Ka'bi A.
europepmc   +1 more source

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Angles-Only Orbit Updates for Low-Earth-Orbit Satellites

Journal of Guidance, Control, and Dynamics, 2007
This paper provides the development of a simplified covariance model for predicting the along-track error uncertainty and error uncertainty growth rate for the single-pass, angles-only orbit update, the validation of the model using simulation and real data cases, and a summary of efforts made to characterize the uncertainty of general-perturbations ...
Chris Sabol, Kyle T. Alfriend, David Wiese   +2 more
openaire   +1 more source

Collision matrix for low earth orbit satellites

Journal of Spacecraft and Rockets, 1989
The low Earth orbit (LEO) is becoming cluttered with thousands of satellites, rocket bodies, and a variety of space garbage. This collection of objects crossing paths at speeds on the order of 10 km/s is creating an increasing collision hazard to many operational systems. The effect that the destruction of LEO satellites will have on other users of the
Darren McKnight, Gary Lorenzen
openaire   +1 more source

Low earth orbit satellite systems for communications

International Journal of Satellite Communications, 1991
AbstractIt may be that we are now entering the era of LEO constellation satellite communications after thirty years of domination by the GEO systems. This paper heralds the coming of the new era with a tutorial approach to the system design and trade‐offs of LEO constellation system design.
Gérard Maral, Jean‐Jacques de Ridder, Barry G. Evans, Madhavendra Richharia   +3 more
openaire   +1 more source

GEO data relay for low earth orbit satellites

2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC), 2012
This paper focuses on a novel, conceptual data relay system for relaying data transfer between low earth orbit (LEO) satellites and a gateway through a geostationary earth orbit (GEO) satellite, developed in the framework of the GeReLEO project. Novel channel adaptive transmission schemes are introduced in addition to the access scheme supporting ...
openaire   +1 more source