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GNSS is entering into a period of intense change over the next 5-10 years which will impact on users and operators of high-end GNSS equipment. For many years, GPS and GLONASS existed as the only systems. However, all is set to change with the advent of new global and regional systems (Galileo, Compass, IRNSS, GINS and QZSS), augmentation services and test satellites offering combined new and improved...
In this paper we revive an experiment carried out by NASA more than decade ago now called micro-GPS. Based on SDR, the GPS receiver is implemented in software and operates in different modes depending on the battery status, autonomous, assisted, and passive. In autonomous mode, the receiver performs all the standard tasks including acquisition, tracking, navigation data decoding, and positioning....
The use of GNSS receivers for on-board satellite orbit determination has become a common solution in new satellite design, as it considerably simplifies the overall architecture if compared to traditional orbit determination systems. Different challenges have to be faced while designing a GNSS system for these applications, since in general the terrestrial receivers are not designed to guarantee their...
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...
The aim of this paper is to provide guidelines for developing high-quality, well-written GNSS software receivers. The systematic application of software design patterns and programming methodologies speeds up the development process by providing tested, proven development paradigms, and improved code readability for coders, receiver architects, and users. This includes unit testing of all the modules,...
With the multiplication of navigation systems (GPS, GALILEO, GLONASS, QZSS, ...) the variety of radio navigation signals to be received increases greatly and involves 8 frequency bands and about 20 different signals. The paper presents an innovative receiver architecture resting on a full flexibility concept, allowing any tracking channel to be allocated to any kind of signal. The resulting software...
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