Application of a Multiple Hypothesis Filter to near GEO high area-to-mass ratio space objects state estimation |
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| Institution: | 1. The Boeing Company, 5555 Tech Center Drive, Suite 400, Colorado Springs, CO 80919, USA;2. GN&C Group of AFRL/RV, Air Force Research Laboratory, 3550 Aberdeen Ave. SE, Kirtland AFB, NM 87117, USA;3. Air Force Research Laboratory, 3550 Aberdeen Ave. SE, Kirtland AFB, NM 87117, USA;1. Dublin Energy Lab, Dublin Institute of Technology, Ireland;2. School of Civil and Structural Engineering, Dublin Institute of Technology, Ireland;3. Gas Networks Ireland, Cork, Ireland;1. Departamento de Física, Universidade Federal de São Paulo, UNIFESP, Diadema, 09972-270, Brazil;2. Department of Physics, Oklahoma State University, Stillwater, OK, 74078, USA;3. Department of Physics & Astronomy, University of Hawaii, Honolulu, HI 96822, USA;4. PITT PACC, Department of Physics and Astronomy, University of Pittsburgh, 3941 O''Hara St., Pittsburgh, PA 15260, USA;5. Instituto de Física, Universidade de São Paulo, São Paulo, 05508-090, Brazil;6. Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019, USA;1. College of Resources and Environment/Micro-element Research Center, Huazhong Agricultural University, Wuhan, Hubei Province 430070, PR China;2. Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, PR China;1. Department of Pathology, Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Sevilla, Spain;2. Department of Biochemistry, Universidad Autónoma de Madrid (UAM), Instituto de Investigaciones Biomédicas ‘Alberto Sols’ (CSIC-UAM), IdiPAZ, Madrid, Spain;3. Translational Research Laboratory, MD Anderson International Foundation, Madrid, Spain;4. Department of Pathology, Hospital Universitario Ramón y Cajal, Instituto de Investigación Sanitaria Ramón y Cajal (IRYCIS), Universidad de Alcalá, Madrid, Spain;5. Department of Molecular Cytogenetics, MD Anderson Cancer Center, Madrid, Spain;6. Department of Pathology, Memorial Sloan-Kettering Center, Memorial Hospital, New York, NY, USA;7. Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, University of Lleida, IRBLleida, Lleida, Spain |
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| Abstract: | Optical surveys have identified a class of high area-to-mass ratio (HAMR) objects in the vicinity of the Geostationary Earth Orbit (GEO) regime. The nature of these objects is not well known, though their proximity to the GEO belt implies origins from space objects (SOs) near GEO. These HAMR objects pose a collision hazard as they transit through the vicinity of active GEO satellites. Due to their high area-to-mass ratios (AMRs), ranging from 0.1 to 20 m2/kg and higher, the effective solar radiation pressure perturbs their orbits significantly. Improvements in detection sensitivity will result in large numbers of uncorrelated tracks from surveys. A Multiple Hypothesis Filter (MHF) approach to the initial state estimation and track association provides a potentially automated and efficient approach to the processing of multiple un-correlated tracks.The availability of long-term optical angles data collected for a set of near GEO HAMR objects provides the means for testing candidate estimation processes such as the MHF. A baseline orbit determination (OD) process uses an Extended Kalman Filter/Smoother to manually estimate the 6 orbital elements and the effective area-to-mass ratio (AMR) which drives the solar radiation pressure perturbations on the orbital trajectories. In addition to allowing the characterization of the long-term behavior of the AMR, this process establishes a pseudo-truth trajectory to which the MHF analysis can be compared. An Unscented Kalman Filter (UKF) is applied in the MHF estimation process to estimate the 6 orbital elements and AMR, with no a priori state assumptions, and the results are compared to the pseudo-truth results for validation.The work to be presented summarizes the UKF/MHF process and assesses state estimation performance based on selected data for selected near GEO HAMR objects having a range of AMR value and variations. The prediction accuracy is also assessed by comparing predictions derived from filter updates to segments of the pseudo-truth trajectory determined from data not included in the updates. |
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