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The following topics are dealt with: GNSS challenges over the next 10 years; GPS; Galileo; multipath, interference & propagation; sensor fusion; space receivers; synergy between satellite navigation and communications; and signal processing.
The evolution of Global Navigation Satellite Systems (GNSS) will see the introduction of new security services both in the civil and military domain. The threat of attacks against GNSS such as spoofing has lead to the design of GNSS signals and receiver technologies that attempt to address the problem both at the signal, data and receiver level. In particular, it is expected that modern GNSS will...
This publication explores the influence of a realistic multipath channel model to satellite navigation applications in urban environments. In this context we have discovered that there is a tradeoff between accuracy and robustness concerning the bandwidth. While narrow band signals such as GPS C/A, BOC (1,1) proved to be robust especially under shadowing situations the wideband signals lost lock very...
This paper proposes an improved implementation of the subspace projection method aiming to minimize the near-far effect that occurs in Global Navigation Satellite System receivers. Our technique does not demand phase estimation of the strong signals, thus being suitable for non-coherent receivers. Simulation results demonstrate the effectiveness and the limitations of the proposed mitigation technique.
The further development of navigation receivers has to go hand in hand with the advances in the constellations for Global Navigation Satellite Systems (GNSS). As more and more features will be provided by the services of modernized GPS, GLONASS and the upcoming Galileo and Compass, the functions and performance of spaceborne GNSS receivers have to be extended as well. Today, the MosaicGNSS Receiver...
In this paper the concept of Software Defined Radio (SDR) and its use in modern GNSS receiver is highlighted demonstrating how software receivers are important in many situations especially for verification and validation. After a brief introduction of gLab, a fully software high modular tool to generate, process and analyze current and future GNSS signals, the different software modules will be described...
In order to support a wide range of user applications demanding provision of high accuracy positioning along with the continuous availability of a reliable signal, integrity has been identified as one of the key concepts in the design of GNSS missions. Integrity performances are defined in association to confidence levels on the determination of several accuracy related parameters, representing the...
This paper contains selected test results of an indoor positioning prototype system making use of GPS/Galileo signals on L1/E1 and L5/E5a in addition to WiFi data, ZigBee data and a MEMS-based dead reckoning algorithm called pedestrian navigation system (PNS). The system uses a partially coherent ultra-tightly coupled integration scheme. The GNSS signal processing (acquisition and tracking) supports...
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