Inside GNSS Media & Research

SEP-OCT 2018

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60 Inside GNSS S E P T E M B E R / O C T O B E R 2 0 1 8 T here is an increasing importance for GNSS open services for our economy, society, and security, e.g., in the field of traffic monitor- ing and controlling, be it in the air, at sea, or on land, or in first aid response in any kind of emer- gency, as well as for timing applications like bank transactions or power grid synchronization. Due to these developments, it is necessary to enhance the availability and more importantly the reliability of GNSS services. Improving the signal robustness against multipath, jamming, spoofing, and interfer- ence from secondary sources or even from other constellations is a crucial task for future research and development. To improve GNSS signals, it is crucial to test and analyze the signal performance under various conditions and harsh environments. is was and is done mainly with computer simu- lations. These simulations are easy and cheap to realize as well as flexible and repeatable. However, a simulation always relies on assumptions and sim- plifications of a real-world problem. erefore, we are developing a flexible, cost-efficient, and highly adjustable test system, usable for real test scenari- os. With this system, we can investigate the GNSS signal structures, range performance, authentica- tion methods, channel coding, and signal behavior under foliation, blockage, jamming, spoofing, and other interference. e upcoming interference challenges for GNSS require a detailed analysis on the GNSS signal level. erefore, a testing method is needed which goes beyond the possibilities of simulations to create a realistic and flexible test environment. e progress in unmanned aerial vehicles (UAV) and soware defined radio (SDR) technologies obtained in recent years provide this efficient and flexible approach to mimic GNSS satellites and create an innovative GNSS signal performance testbed in a real environ- This article presents the authors' experience in setting up an airborne pseudolite (UAVlite) with the needed ground-based infrastructure to perform code and phase ranging performance analysis. UAVlites transmit GNSS-like signals free from any local transmitter multipath (in contrast to ground-based transmitters) and can in principle be localized in real-time through a synchronized network of ground stations which may also broadcast the UAVlite positions in real-time. Furthermore, software defined radio allows for the easy broadcast of new navigation signals and testing them in real environments. In this first step, the key technology elements are verified with one UAVlite, two ground stations, and a CBOC signal. Decimeter code range accuracy and millimeter phase range accuracy has been demonstrated. DANIEL SIMON MAIER THOMAS KRAUS DANIELA ELIZABETH SÁNCHEZ MORALES RONNY BLUM PROF. THOMAS PANY INSTITUTE OF SPACE TECHNOLOGY AND SPACE APPLICATIONS, UNIVERSITÄT DER BUNDESWEHR MÜNCHEN WORKING PAPERS Innovative Test System for GNSS Signal Performance Analysis in Real Environments | Part 1

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