VLBI observations to the APOD satellite
Artikel i vetenskaplig tidskrift, 2018
The APOD (Atmospheric density detection and Precise Orbit Determination) is the first LEO (Low Earth Orbit) satellite in orbit co-located with a dual-frequency GNSS (GPS/BD) receiver, an SLR reflector, and a VLBI X/S dual band beacon. From the overlap statistics between consecutive solution arcs and the independent validation by SLR measurements, the orbit position deviation was below 10 cm before the on-board GNSS receiver got partially operational. In this paper, the focus is on the VLBI observations to the LEO satellite from multiple geodetic VLBI radio telescopes, since this is the first implementation of a dedicated VLBI transmitter in low Earth orbit. The practical problems of tracking a fast moving spacecraft with current VLBI ground infrastructure were solved and strong interferometric fringes were obtained by cross-correlation of APOD carrier and DOR (Differential One-way Ranging) signals. The precision in X-band time delay derived from 0.1 s integration time of the correlator output is on the level of 0.1 ns. The APOD observations demonstrate encouraging prospects of co-location of multiple space geodetic techniques in space, as a first prototype.
VLBI
SLR
APOD
GNSS
Space ties
Författare
Jing Sun
Chinese Academy of Sciences
Beijing Aerospace Flight Control Center
Geshi Tang
Beijing Aerospace Flight Control Center
Fengchun Shu
Shanghai Astronomical Observatory
Xie Li
Beijing Aerospace Flight Control Center
Shushi Liu
Beijing Aerospace Flight Control Center
Jianfeng Cao
Beijing Aerospace Flight Control Center
Andreas Hellerschmied
Technische Universität Wien
Johannes Böhm
Technische Universität Wien
Lucia McCallum
University of Tasmania
Jamie McCallum
University of Tasmania
Jim Lovell
University of Tasmania
Rüdiger Haas
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Alexander Neidhardt
Technische Universität München
Weitao Lu
Beijing Aerospace Flight Control Center
SongTao Han
Beijing Aerospace Flight Control Center
Tianpeng Ren
Beijing Aerospace Flight Control Center
Lue Chen
Beijing Aerospace Flight Control Center
Mei Wang
Beijing Aerospace Flight Control Center
Jinsong Ping
Chinese Academy of Sciences
Advances in Space Research
0273-1177 (ISSN) 18791948 (eISSN)
Vol. 61 3 823-829Drivkrafter
Hållbar utveckling
Ämneskategorier
Fysik
Geovetenskap och miljövetenskap
Fundament
Grundläggande vetenskaper
Infrastruktur
Onsala rymdobservatorium
DOI
10.1016/j.asr.2017.10.046