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

GNSS

APOD

Space ties

SLR

Författare

Jing Sun

Organisation okänd

Geshi Tang

Organisation okänd

Fengchun Shu

Shanghai Astronomical Observatory

Xie Li

Organisation okänd

Shushi Liu

Organisation okänd

Jianfeng Cao

Organisation okänd

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

Organisation okänd

SongTao Han

Organisation okänd

Tianpeng Ren

Organisation okänd

Lue Chen

Organisation okänd

Mei Wang

Organisation okänd

Jinsong Ping

Organisation okänd

Advances in Space Research

0273-1177 (ISSN)

Vol. 61 3 823-829

Drivkrafter

Hållbar utveckling

Ämneskategorier

Fysik

Geovetenskap och miljövetenskap

Fundament

Grundläggande vetenskaper

Infrastruktur

Onsala rymdobservatorium

DOI

10.1016/j.asr.2017.10.046