Space Technologies and Reference Systems. Introduction. Modern technological trends and developments. Stellar, terrestrial reference systems and their interrelationships. Dynamic behavior of the earth. The movement of satellites. Satellite orbits, parameters and description elements. Transformations from Keplerian elements to other reference systems. Trajectory journals and high precision trajectory estimation.
GNSS systems (GPS, GLONASS, BeiDou, QZSS, IRNSS), Developments and trends. New signals and satellites. The DORIS system and its developments. Principles of operation and geodetic applications of laser telemetry (SLR) and very long base interferometry (VLBI) systems.
Synthetic Aperture Radar (SAR) systems. Basic operating principles, processing methods, geodetic applications. Basic principles of satellite altimetry operation. Processing methods and geodetic applications in the study of the sea.
Methods and algorithms for processing GNSS observations. Precise Point Positioning. Phase ambiguity resolution algorithms (LAMBDA, SIGMA, WL/NL etc.). Special geodetic techniques of real-time GNSS measurements. Single-Base RTK, Network RTK (VRS, FKP, MAC). Augmentation systems and navigation applications. Complex differential GNSS systems (WAAS, LAAS, EGNOS). Use in navigation applications.
Basic principles in the theory of space physics. Space weather (sun/space/magnetosphere/atmosphere/earth). Ionospheric effect and modeling. Impact on satellite systems.
Kinematics of the solid crust and reference systems. Geodetic applications of kinematic behavior monitoring. Use of different systems in the definition and implementation of global reference systems. Special applications in natural disaster monitoring/forecasting/warning. Study of changes in the environment. Utilization by other sciences.
Low cost GNSS receivers and other sensors. Utilization in geodetic applications, in navigation, in smart devices.
- Teacher: Βασίλειος Γκίκας
- Teacher: Μαρία Τσακίρη
ECTS : 5
Language : el
Learning Outcomes : The technologies of satellite positioning and navigation systems (GPS, GLONASS, BEIDOU, QZSS, IRNSS), the DORIS system, satellite augmentation systems (SBAS), technologies such as laser telemetry (SLR/LLR), Very Long Baseline Interferometry (VLBI), satellite altimetry and synthetic aperture radars (SAR), are used together with advanced mathematical techniques for solving various scientific and practical problems of determining the three-dimensional position in space, the implementation of modern global reference systems, the study of the Earth s gravity field, the Earth s dynamic behavior, etc. The course provides an overview of the operation and basic applications of the above systems and technologies, as well as the geodetic reference systems used in each case. An extensive presentation of the theory and practical methods that demonstrate how such elements as satellite orbits, precise time measurement, gravity and other physical laws, Earth s dynamics and advanced techniques for processing satellite observations collectively form an integral body of necessary geodetic knowledge and how this knowledge is used in solving basic scientific and practical problems is provided. Specific applications are examined, as well as modern developments in GNSS systems such as new frequencies, processing algorithms (e.g. PPP), real-time measurement techniques. Also the role of different systems in environmental monitoring, in the study of natural disasters. Upon completion of the course, students develop skills and acquire basic knowledge of the theory of advanced methods and applications of modern geodesy using satellite and space technologies. They are able to retrieve, process, analyze data with different methods and algorithms, combine results for their interpretation and decide on the method of studying and solving problems they have faced.