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- W986551263 abstract "We describe the software GNSS receiver, its schema, implementation into a computer, results of tests and application for railway, municipal transportation and for shipping of dangerous matters. The receiver, originally for the Galileo system, is on a printed board which is the size of a Euro Card (160?100 mm). Because the Galileo signal is not in the air, it was modified for the GPS and GLONASS systems. Experimental GNSS receiver (EGR) was used as a tool for its development and it is also described. Even if we use the receiver which is able to process signals of all three systems, it is impossible to ensure reception of GNSS signals in adverse conditions (under leaves canopy, in urban canyons, in hollow tracks, etc.). Therefore we have studied the possibilities of communication systems which will use modern signals known from satellite navigation and we have obtained very interesting results when we used DVB-T transmitters as beacons. 1 EXPERIMENTAL GNSS SOFTWARE RECEIVER (EGR) Requirements of the Czech Ministry of Transport have led us to development of a Galileo navigation receiver. After analysis of state of Galileo system and other GNSS navigation systems we formulated our own requirements on the receiver which have been as follows: 1 The processing of all GPS, GLONASS, SBAS and Galileo signals 2 High flexibility and rapid implementation of the new signal processing 3 Enough performance for the very complex signal processing Those requirements can be satisfied by the software defined radio (SDR) architecture. The principal schema of the software defined radio is shown on Fig. 1. RF front end Analog to Digital Convertor Programable logic Computer Fig. 1. Block diagram of the SDR receiver solutions Requirements mentioned above have led to receiver concept which will allow to process signals with wide frequency bandwidth. The signal samples are firstly processed in the programmable logic, where the bandwidth of the signal is reduced and then the signal is processed in a computer. Both programmable logic and the computer can be parts of a FPGA. Demand of flexible development of hardware and software of the receiver has tended to an experimental hardware platform which would allow very simple replacement of particular components and blocks (radio frequency filters, etc.) and allow very easy creation and realization of signal processing algorithms." @default.
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- W986551263 date "2007-01-01" @default.
- W986551263 modified "2023-09-28" @default.
- W986551263 title "Software navigation receivers for GNSS and DVB" @default.
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