Research of AltBOC modulation (797946), страница 2

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Oscillation along verticalAccordingtotheruleabove,theplotwhenC A , C A ' , CB , CB ' takes -1,1,1and 1 Fig.6 becomes:THE NUMBER OF 4-CODE BEING 1 IS EVEN FOR INSTANCEcodeCACA 'CBCB 'CACA 'CBCB 'valueangle11-1-111-1-1π /45π / 4π /4Now, the phase jumping of sE 5 (t ) turns to:2 25π / 4−2 2Figure 14. The signal’s Phase function change for the non-constant envelopeinproved constantAnd then,get the equivalent 8-PSK AltBOC:The harmonic frequnces of single side subcarrier and itsconjugate are fs(15 × 1.023MHz) and –fs corresponding tomove the spectrum of base band PRN code to the left and rightof the center frequence for fs separately[4].(Fig.16)V.CONCLUSIONSBy smart design of the subcarrier and changing the rule ofphase jumping, the E5 signal of Galileo system has realizedmaking AltBOC modulation envelope constant.Besides,itachieves the aim of QPSK method to modulate double bandsignals on E5a and E5b.Figure 15.

Equivalent 8-PSK AltBOCREFERENCES[1][2][3][4]Figure 16. Power spectrum of 8-PSK AltBOCAltBOC for Dummies or Everything You Always Wanted to KnowAbout AltBOC, Laurent Lestarquit Géraldine Artaud, Jean-LucIssler,ION GNSS 21st. International Technical Meeting of the SatelliteDivision, 16-19, September 2008, Savannah, GA.BOC Power Spectrum Densities, Emilie Rebeyrol, Christophe Macabiauetl,ION NTM 2005, 24-26 January 2005, San Diego, CANew Investigations on Wide band GNSS2 Signals, L.

Ries, L. Lestarquit,JL. Issler, A. Pratt,G. Hein, J .Godet, P. Dondl, F. Couturier, P. Erhard,J.Owen, R. Lucas-Rodriguez, JC. Martin,GNSS 2003 Conference, GrazSpectral Measurements of GNSS Satellite Signals Need for WideTransmitted Bands, Jean-Luc Issler, Lionel Ries, LaurentLestarquit,ION GPS/GNSS 2003, 9-12 September 2003, Portland, OR.

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