Spaceborne GNSS-Receiving System Performance Prediction and Validatio (original) (raw)
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High Accuracy GNSS Based Navigation in GEO
Acta Astronautica, 2017
Although significant improvements in efficiency and performance of communication satellites have been achieved in the past decades, it is expected that the demand for new platforms in Geostationary Orbit (GEO) and for the On-Orbit Servicing (OOS) on the existing ones will continue to rise. Indeed, the GEO orbit is used for many applications including direct broadcast as well as communications. At the same time, Global Navigation Satellites System (GNSS), originally designed for land, maritime and air applications, has been successfully used as navigation system in Low Earth Orbit (LEO) and its further utilization for navigation of geosynchronous satellites becomes a viable alternative offering many advantages over present ground based methods. Following our previous studies of GNSS signal characteristics in Medium Earth Orbit (MEO), GEO and beyond, in this research we specifically investigate the processing of different GNSS signals, with the goal to determine the best navigation performance they can provide in a GEO mission. Firstly, a detailed selection among different GNSS signals and different combinations of them is discussed, taking into consideration the L1 and L5 frequency bands, and the GPS and Galileo constellations. Then, the implementation of an Orbital Filter is summarized, which adaptively fuses the GN1SS observations with an accurate orbital forces model. Finally, simulation tests of the navigation performance achievable by processing the selected combination of GNSS signals are carried out. The results obtained show an achievable positioning accuracy of less than one meter. In addition, hardware-in-the-loop tests are presented using a COTS receiver connected to our GNSS Spirent simulator, in order to collect real-time hardware-in-the-loop observations and process them by the proposed navigation module.
Asian Journal of Engineering and Technology
With Multi-GNSS Advanced Demonstration Tool for Orbit and Clock Analysis (MADOCA), a software estimator of precise satellite information, by JAXA, u-blox C099 ZED-F9P and MSJ-3008-GM4-QZS using MADOCA-PPP can be exploited in GNSS applications that require sub-decimeter accuracy without being costly. To evaluate their performance, convergence time and accuracy of solutions are compared to Trimble NetR9, a survey-grade receiver. Post-processed PPP solutions of ZED-F9P were computed using RTKLIB and real-time PPP was provided by the MSJ-3008-GM4-QZS. Results showed ZED-F9P achieved an RMS of 5.28 cm, 2.89 cm, and 9.55 cm in East, North, and Up directions. This means ZED-F9P can be used in applications requiring below 10 cm accuracy even without base station. MSJ-3008-GM4-QZS obtained an RMS of 10.45 cm, 6.27 cm, and 27.56 cm in the same directions. Unlike ZED-F9P, it achieved above 10 cm accuracy in North and Up directions which is due to large errors from cycle slips and jumps in obse...
Real time precise orbit determination from single frequency GNSS receiver in low earth orbit
2018
And PHase Ionospheric Correction (GRAPHIC). Il metodo GRAPHIC è ottenuto tramite la combinazione di due classiche misure, lo Pseudorange (PR) e la Carrier Phase (CP), e presenta un rumore molto minore dello PR. La performance di stima di questo nuovo approccio è stata confrontata con quella di un ltro di navigazione (NAV) che si basa su misure PR utilizzando dati reali di missione.
Precise orbit determination for LEO spacecraft using GNSS tracking data from multiple antennas
To support various applications, certain Earth-orbiting spacecrafts (e.g., SRTM, COSMIC) use multiple GNSS antennas to provide tracking data for precise orbit determination (POD). POD using GNSS tracking data from multiple antennas poses some special technical issues compared to the typical single-antenna approach. In this paper, we investigate some of these issues using both real and simulated data. Recommendations are provided for POD with multiple GNSS antennas and for antenna configuration design. The observability of satellite position with multiple antennas data is compared against single antenna case. The impact of differential clock (line biases) and line-of-sight (up, along-track, and cross-track) on kinematic and reduced-dynamic POD is evaluated. The accuracy of monitoring the stability of the spacecraft structure by simultaneously performing POD of the spacecraft and relative positioning of the multiple antennas is also investigated.
Multi-GNSS Receiver for Aerospace Navigation and Positioning Applications
ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2014
The upcoming Galileo system opens a wide range of new opportunities in the Global Navigation Satellite System (GNSS) market. However, the characteristics of the future GNSS signals require the development of new GNSS receivers. In the frame of the REAGE project, DEIMOS and ISEL have developed a GNSS receiver targeted for aerospace applications, supporting current and future GPS L1 and Galileo E1 signals, based on commercial (or, in the furthest extent, industrial) grade components. Although the REAGE project aimed at space applications, the REAGE receiver is also applicable to many terrestrial applications (ground or airborne), such as Georeferencing and Unmanned Aerial Vehicle (UAV) navigation. This paper presents the architecture and features of the REAGE receiver, as well as some results of the validation campaign with GPS L1 and Galileo E1 signals.
2010
In this paper, we present the implementation of a versatile Global Navigation Satellite System (GNSS) receiver for satellite applications. For versatility purpose, the choice of the receiver algorithms has been motivated by 1) their capability to fulfill the application requirements with a moderate complexity, 2) their capability of being factorized in a small set of elementary modules that can be configured and combined in various ways in order to process both GPS and Galileo current and future signals. These algorithms have been specified using a modeling language that can be common to hardware and software flow: C++ based SystemC. The use of a virtual platform for simulation allows us to identify bottleneck of the architecture and to propose algorithm modification to solve them. Thanks to this algorithm redesign, the time of acquisition (i.e. synchronization with a given GNSS satellite), for Low Earth Orbit (LEO) application, has been reduced by a factor 2 from 8.5 s to 4.25 s.
The joint ESA/NASA Galileo/GPS Receiver Onboard the ISS – The GARISS Project
Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), 2019
is the Head of the Navigation Support Office at ESA's European Space Operations Center (ESOC) in Darmstadt, Germany. Previously, he worked at the European GNSS Authority (GSA) as the Head of System Evolutions for Galileo and EGNOS and he also worked for the European Commission in the Galileo Unit. For over 25 years, he has worked on activities related to the use of GPS/GNSS for space applications. He holds a master and doctoral degree in aerospace engineering from the Technical University of Berlin, Germany. Erik Schönemann has joint the Navigation Support Office at ESA/ESOC in 2006 as a contractor and became permanent staff in 2015. He is involved in Galileo studies since the launch of the first Galileo validation satellite GIOVE-A and is the technical manager of the Galileo Reference Service Provider (GRSP). He is involved in the coordination of ESA's reference frame activities and contribution to International Services like ILRS, IGS and UTC. Erik Schönemann holds a master and a doctoral degree in Geodesy from the Technical University of Darmstadt, Germany. Francesco Gini is a Navigation Engineer at the Navigation Support Office (OPS-GN) at the European Space Operations Center (ESOC) of ESA. He is responsible for the Space Service Volume (SSV) and Precise Orbit Determination (POD) related activities. He received his PhD in Astronautics and Satellite Sciences at the University of Padova, Italy in 2014 and since then he has been working in ESOC. Michiel Otten is a Navigation Engineer at the Navigation Support Office (OPS-GN) at the European Space Operations Center (ESOC) of ESA. He is responsible for the LEO POD activities and the International Doris Service (IDS) Analysis Centre activities. He received his Master degree in Aerospace Engineering at the Delft University of Technology in 2001 and since then he has been working at ESOC. Pietro Giordano holds a Master in Telecommunication Engineering from University of Padua (Italy) and a Second Level specializing Master in Navigation and Related Application from University of Torino (Italy). He worked in Thales Alenia Space (Italy) as GNSS receiver Engineer before joining ESA in 2009, where he worked first as GNSS receiver support to Galileo project and later as GNSS Security Engineer in the Galileo project. Currently he is in charge of multiple activities related with space GNSS receivers and R&D in space GNSS receiver technology such as Technical Officer for POD receiver in Sentinel, Proba3 missions, development of GNSS space borne receivers for real time on-board POD in CubeSats, development of LEO PNT payloads, support for definition of new AGGA chip and development of GNSS space borne receivers for lunar missions.