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Software navigation receivers for GNSS and DVB

100%

Vejrazka F. , Kovar P. , Eska M. , Puricer P.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2007

tom Vol. 1, no. 2

137--141

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.

Galileo AltBOC E5 Signal Characteristics for Optimal Tracking Algorithms

100%

Vejrazka F. , Kovar P. , Kacmarik P.

2010

tom Vol. 4, no. 1

37--40

The paper deals with an optimal processing of a Galileo E5 signal. A proposed correlator struc-ture was developed on a base of a deep study of an E5 signal cross correlation function. Due to the non linear-ity of the E5 AltBOC modulation the proposed correlator calculates the cross correlation function between a received signal and a signal replica for all possible hypotheses of the navigation message bits. A correct peak tracking verification is realized by implementation of a single side band correlator, which also serves for course signal acquisition and secondary ranging code synchronization. The signal processing was verified on the Galileo Giove A and Giove B satellites with very positive preliminary results.

Porównanie wybranych odmian życicy trwałej w uprawie na zielonkę. Część I

88%

Grygierzec B. , Klimek-Kopyra A. , Musial K. , Vozar L. , Kovar P.

tom 32

nr 1