Abstract
This study proposes real-time orbit/clock determination of Korean Navigation Satellite System (KNSS), which employs the kinematic precise point positioning (PPP) solutions of multiple Global Navigation Satellite System (multi-GNSS) to compensate for receiver clock offset. Global visibility of KNSS satellites in terms of geometric coverage is first analyzed for the purpose of selecting optimal locations of KNSS monitoring stations among International GNSS Service (IGS) and Multi-GNSS Experiment (MGEX) network. While the receiver clock offset is obtained from multi-GNSS PPP clock solutions of real observation data, KNSS measurements are simulated from the dynamically propagated KNSS reference orbit and the receiver clock offset. The offset and drift of satellite clock are also generated based on two-state clock model considering atomic clock noise. Real-time orbit determination results are compared with an artificially generated true or bit, wihch show 0.4m and 0.5m of 3-dimensional root-mean-square (RMS) position errors for geostationary (GEO) and ellitically-inclined-geosynchronous-orbit (EIGSO) satellites, respectively. The overall results show that the real-time precise orbit determination of KNSS should be achievable in meter level by installing KNSS-compatible multi-GNSS receivers on the IGS and/or MGEX network. The overall process can be also used to verify integrity of KNSS monitoring stations.
Highlights
This study presents an alternative orbit determination (OD) of Korean Navigation Satellite System (KNSS), a regional navigation satellite system (RNSS) under development for covering Korea, in case communications with ground stations are not properly accessible
Introducing Multi-GNSS precise point positioning (PPP) of ground monitor stations to compensate for receiver clock bias and other metrological parameters, this paper presents experimental study of a new OD algorithm, and is organized as follows: in chapter 2, KNSS orbits are briefly introduced; in chapter 3, multi-GNSS PPP is conducted by observing from selected monitor stations of Multi-GNSS Experiment (MGEX) network; the overall process of KNSS OD simulation and its results are followed in chapter 4; the summary and conclusion are given
The far East and GEO3 in the far west are considered. These stations (No 5, 8, 10, 12, 14 in Figure 2) barely observe the EIGSO satellites, position dilution of precision (PDOP) of the stations with respect to the geostationary Earth orbits (GEOs) satellite could be improved with additional stations
Summary
This study presents an alternative orbit determination (OD) of Korean Navigation Satellite System (KNSS), a regional navigation satellite system (RNSS) under development for covering Korea, in case communications with ground stations are not properly accessible. Introducing Multi-GNSS PPP of ground monitor stations to compensate for receiver clock bias and other metrological parameters, this paper presents experimental study of a new OD algorithm, and is organized as follows: in chapter 2, KNSS orbits are briefly introduced; in chapter 3, multi-GNSS PPP is conducted by observing from selected monitor stations of MGEX network; the overall process of KNSS OD simulation and its results are followed in chapter 4; the summary and conclusion are given. The ground-track repeatability of EIGSO and GEO constrains the locations of monitoring stations to a certain region. The receiver in the region could observe at least 4 KNSS signals from EIGSO and GEO satellites
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