Results 41 to 50 of about 143,267 (285)

Initial relative-orbit determination using heterogeneous TDOA

2017 IEEE Aerospace Conference, 2017
This paper presents a solution for the initial orbit determination of a space-based RF transmitter using time-difference-of-arrival (TDOA) measurements obtained from space-based receivers in known orbits. Orbit determination requires six independent TDOA measurements spread over time.
Shuster, Simon, Sinclair, Andrew J., Lovell, T. Alan   +2 more
openaire   +2 more sources

Angles-Only Initial Orbit Determination of Low Earth Orbit (LEO) Satellites Using Real Observational Data

Journal of Astronomy and Space Sciences, 2019
The Optical Wide-field patroL-Network (OWL-Net) is a Korean optical space surveillance system used to track and monitor objects in space. In this study, the characteristics of four Initial Orbit Determination (IOD) methods were analyzed using artificial ...
Hyewon Hwang, Sang-Young Park, Eunji Lee
doaj   +1 more source

On initial orbit determination

The Astronomical Journal, 1984
The classical methods of initial orbit determination are brought together within a larger viewpoint. This new synthesis stresses that all such techniques follow one of three approaches. Either they seek to compute the orbital element set, or its equivalent, by attacking the differential equations of motion (Laplace), the first integrals of the ...
openaire   +1 more source

Validation of GPS Based Precise Orbits Using SLR Observations [PDF]

Journal of Astronomy and Space Sciences, 2009
In this study, the YLPODS (Yonsei Laser-ranging Precision Orbit Determination System) is developed for POD using SLR (Satellite Laser Ranging) NP (Normal Point) observations. The performance of YLPODS is tested using SLR NP observations of TOPEX/POSEIDON
Young-Rok Kim, Eunseo Park, Sang-Young Park, Kyu-Hong Choi, Yoola Hwang, Hae-Yeon Kim, Byoung-Sun Lee, Jaehoon Kim   +7 more
doaj   +1 more source

Simulation of the Use of Variance Component Estimation in Relative Weighting of Inter-Satellite Links and GNSS Measurements

Remote Sensing, 2022
Inter-satellite links (ISLs) can improve the performance of the Global Navigation Satellite System (GNSS) in terms of precise orbit determination, communication, and data-exchange capabilities.
Tomasz Kur, Tomasz Liwosz
doaj   +1 more source

Binary Neutron-Star Systems: From the Newtonian Regime to the Last Stable Orbit

, 1998
We report on the first calculations of fully relativistic binary circular orbits to span a range of separation distances from the innermost stable circular orbit (ISCO), deeply inside the strong field regime, to a distance ($\sim$ 200 km) where the ...
A. Abramovici, A. P. Lightman, B. F. Schutz, B. F. Schutz, C. Bradaschia, C. Cutler, D. Lai, E. Amaldi, F. A. Rasio, F. A. Rasio, F. A. Rasio, G. B. Cook, G. J. Mathews, G. J. Mathews, J. M. Bowen, J. P. A. Clark, J. P. A. Clark, J. R. Wilson, J. R. Wilson, J. R. Wilson, J. W. York, Jr., K. Oohara, K. Taniguchi, M. Ruffert, M. Shibata, M. Shibata, M. Shibata, M. Shibata, P. Anninos, P. Marronetti, R. Arnowitt, S. L. Shapiro, T. W. Baumgarte, T. W. Baumgarte, X. Zhuge, X. Zhuge   +35 more
core   +1 more source

Initial Orbit Determination for Distant Objects

The Astronomical Journal, 2004
Initial orbit determination for distant objects can be made a simple linear problem with explicit solutions. This is similar to stellar parallax work, with very difficult observations but simple computations. A very simple procedure for computing ephemerides for distant objects is proposed.
openaire   +2 more sources

Real‐World Pediatric Blinatumomab Administration: Access to Outpatient Care Delivery and Impact of a Hospital‐Dispensed Model

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Blinatumomab has been shown to be highly effective for patients with pediatric B‐ALL and has recently become standard of care therapy. Due to its past use in the clinical trial setting, there is limited information available about real‐world administration.
Katelyn Oranges, Kelly A. Duffy, Sara McDonough, Evelyn Kurpiewski, R. Jennifer Randall, Allison Barz Leahy, Haley M. Newman, Joyce P. Lee, Stephen P. Hunger, Anne F. Reilly, David T. Teachey, Susan R. Rheingold, Daniel J. Zheng   +12 more
wiley   +1 more source

Evaluating the Utility of Paired Tumor and Germline Targeted DNA Sequencing for Pediatric Oncology Patients: A Single Institution Report

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Objective To evaluate the diagnostic yield and utility of universal paired tumor–normal multigene panel sequencing in newly diagnosed pediatric solid and central nervous system (CNS) tumor patients and to compare the detection of germline pathogenic/likely pathogenic variants (PV/LPVs) against established clinical referral criteria for cancer ...
Natalie Waligorski, Rebecca Ronsley, Shannon M. Stasi, Jeffrey Stevens, Erin R. Rudzinski, Christina M. Lockwood, Sarah E. S. Leary, Bonnie L. Cole, Michelle A. Ting, Vera Paulson   +9 more
wiley   +1 more source

Overview on Space-Based Optical Orbit Determination Method Employed for Space Situational Awareness: From Theory to Application

Photonics
Leveraging space-based optical platforms for space debris and defunct spacecraft detection presents several advantages, including a wide detection range, immunity to cloud cover, and the ability to maintain continuous surveillance on space targets.
Zhe Zhang, Gaopeng Zhang, Jianzhong Cao, Cheng Li, Weining Chen, Xin Ning, Zheng Wang   +6 more
doaj   +1 more source