Steffen Thoelert

Steffen Thoelert works at the German Aerospace Center (DLR).

Figure 1: Groundtracks of NVS-02 for six consecutive days. The colored dots represent stations tracking the L5 signal on the day given in the legend. Pink ground tracks indicate tracking by any of the stations. (All figures provided by the authors)

May 8, 2025

NVS-02: Navigation signals from transfer orbit

Figure 1. GLONASS K2 spectrum of the L1 frequency band. The different components of the L1 CDMA signal are indicated by colored boxes. L1SC: secured signal. L1OC: open service signal. (All figures provided by the authors)

April 29, 2024

GLONASS CDMA signals now on L1, L2

QZS-R1 is prepped for testing. At left is the Earth-oriented surface that hosts the L-band antenna. (Photo: JAXA)

March 8, 2022

First transmission of L1C/B by QZS-1R

April 28, 2020

GPS III ‘Magellan’ starts signal transmission

Figure 1. Theoretical spectra of the four signals transmitted by a GPS III satellite in the L1 frequency band. (Image: Authors)

March 19, 2019

First light: Broadcast of L1C by GPS III

FIGURE 1. An artist’s view of the QZSS satellites. The upper-most satellite is the geostationary QZS-3 spacecraft with the additional S-band dish antenna whereas the other satellites pictured are the inclined geosynchronous satellites. (Image: Mitsubishi Electric/JAXA)

February 9, 2018

Innovation: QZS-3 and QZS-4 join the Quasi-Zenith Satellite System

Source: GPS World

August 23, 2017

QZS-2 signal analysis, QZS-3 launched