Inside GNSS Media & Research

JUL-AUG 2018

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48 Inside GNSS J U L Y / A U G U S T 2 0 1 8 www.insidegnss.com T he transmission of new radio navigation signals in a dedicat- ed band has revolutionized the GNSS industry by allowing for cross- compatibility and reduced expenses in receiver design. e concept started with the transmission of the Global Position- ing System (GPS) L1 C/A signal, which soon aer became the gold standard of radio navigation. GLONASS satellites followed and the constellation reached maturity during the Soviet Union era, but degraded aer its collapse. e Gal- ileo constellation finally cemented this idea with the addition of the E1 open service signals. Such efforts prepared the field for international collaboration and signal design around the concept of multi-constellation receiver designs. e Government of the Russian Fed- eration approved by its Decree No. 587 of 20 August 2001, a budget of 347 bil- lion ruble (US $11.81 billion), running through 2020 by which a federal task program will restore and modernize the GLONASS constellation. e program aims at improving the space, ground- based, and user equipment segments of the system. By 2010, the constellation reached full coverage in Russia and in 2011 full operational capability when the full orbital constellation of 24 satel- lites was achieved. Aiming to provide better accuracy, multi-path resistance, and especially, greater interoperability with GPS, Galileo, and other GNSS, new GLONASS-K satellites will transmit Code Division Multiple Access (CDMA) signals in addition to the system's tra- ditional Frequency Division Multiple Access (FDMA) signals. GLONASS sys- tem restoration is almost completed and the latest updates seem to indicate that the program is on track and has enough budget to complete its modernization in the future (see Additional Resources, I. Revnivykh). e new modernized sys- tem will ensure that GLONASS coher- ent FDMA and CDMA navigation sig- nal sets will satisfy a wide range of user requirements, from ordinary navigation to high-precision applications. With the international community moving in this direction, it is more com- mon nowadays to see receiver develop- An open source implementation of a Global Navigation Satellite System (GNSS) software receiver targeting the Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS) L1 C/A signal addition is presented. The signal composition and general architecture of the proposed software receiver implementation are provided along with detailed descriptions of the main signal processing algorithms involved in acquisition, tracking, and telemetry decoding of the navigation signal. Connections to external software by means of traditional format output standards are also presented and validated with real-life signals. DAMIAN MIRALLES UNIVERSITY OF COLORADO BOULDER GABRIEL F. P. ARAUJO UNIVERSITY OF BRASILIA WORKING PAPERS Robustness Improvements for the PVT Solution via Consideration of GLONASS in a GNSS Software Defined Receiver

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