THE GPS NAVIGATION AND OCCULTATION EXPERIMENT (NOX) ONBOARD TET-1 -RESULTS AND EXPERIENCE AFTER ONE YEAR IN SPACE

摘要

The German TechnologieErprobungsTr?ger-1 (TET-1, "Technology Experiments Carrier") satellite is a small-scale spacecraft developed within the national On-Orbit-Verification (OOV) program, primarily intended to provide research institutions and companies with flight opportunities for newly developed technologies. TET-1 has been successfully launched on July 22nd, 2012,from Baikonur onboard a Soyuz-FG. In total, TET-1 accommodates eleven technology payloads,including the Navigation and Occultation eXperiment (NOX). NOX is composed of a main unit, containing a Commercial Off-The-Shelf (COTS) dual-frequency PolaRx2 GPS receiver by Septentrio and an electrical interface board, two GPS antennas, one pointing to the zenith and the other in anti-flight direction and a relay for switching between these antennas. The PolaRx2 is a geodetic-grade GPS sensor designed for terrestrial applications and provides measurements for up to 16 satellites.