GPS World, January 2014
RECEIVER DESIGN GNSS Interoperability FIGURE 2 Teseo 2 RF hardware changes for GLONASS FIGURE 4 DOP accuracy benefits of GNSS meant more major changes to the hardware As shown in FIGURE 2 in orange a second mixer was added with second IF path and A D converter The baseband changes added a second pre processing FKDLQ DQG FRQ JXUHG DOO WKH DFTXLVLWLRQ FKDQQHOV DQG WUDFNLQJ FKDQQHOV WR ÀH LEO VHOHFW HLWKHU LQSXW FKDLQ HVV YLVLEOH WKH FRGH JHQHUDWRUV ZHUH PRGL HG WR VXSSRUW FKLS FRGHV DQG NFKLSV VHF UDWHV 7HVHR DSSHDUHG ZLWK 36 21 66 VXSSRUW LQ DQG GHPRQVWUDWHG WKH EHQH W RI 166 LQ XUEDQ FDQ RQV DV VKRZQ E WKH GLOXWLRQ RI SUHFLVLRQ 23 SORW IRU FHQWUDO RQGRQ LQ FIGURE 4 7KH 36 RQO UHFHLYHU LQ UHG KDV IUHTXHQW 23 H FXUVLRQV EH RQG OLPLWV UHVXOWLQJ HLWKHU LQ EDG DFFXUDF RU HYHQ LQWHUUXSWHG DYDLODELOLW Q FRQWUDVW WKH 166 YHUVLRQ LQ EOXH KDV D 23 JHQHUDOO EHORZ ZLWK D VLQJOH PD LPXP RI DQG WKXV SHUFHQW DYDLODELOLW 7UDFNLQJ VDWHOOLWHV HYHQ LI PDQ DUH YLD QRQ OLQH RI VLJKW 1 26 UHÀHFWHG SDWKV DOORZV VRSKLVWLFDWHG HOLPLQDWLRQ RI GLVWRUWHG PHDVXUHPHQWV EXW VWLOO FRQWLQXRXV DQG KHQFH DFFXUDWH SRVLWLRQLQJ BeiDou LNH DOLOHR HLRX LV D VWRU RI FKDSWHUV KDSWHU ZDV QR DQG UXQQLQJ RQ D GHPR GXDO 5 DUFKLWHFWXUH DV SHU WKH VFKHPDWLF VKRZQ LQ FIGURE 5 FIGURE 3 Teseo 2 and Teseo 3 baseband changes for GLONASS FIGURE 5 Demo Teseo 2 dual RF implementation of BeiDou FIGURE 6 Beidou positioning results KDSWHU ZDV WKH VDPH KDUGZDUH ZLWK WKH WHVW VR DOO VDWHOOLWHV EXW VWLOO QR SRVLWLRQLQJ KDSWHU ZDV WKH IXOO JLYLQJ SRVLWLRQLQJ LQ DQXDU FIGURE 6 WKHQ UXQQLQJ RQ WKH UHDO 7HVHR VLOLFRQ LQ 6HSWHPEHU VKRZQ LQ FIGURE 7 7KH 7HVHR KDV DQ RQ FKLS 5 VHFWLRQ FDSDEOH RI 36 DOLOHR 21 66 DQG HLRX VR QR H WHUQDO 5 LV QHHGHG 7KH FOHDU JUHHQ VSDFH DURXQG WKH 7HVHR FKLS LQ WKH GPS World January 2014 www gpsworld com 60
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