GPS World, May 2011

THE SYSTEM GR10 Leica Uno Leica GS15 Topcon HiPer Ga and HiPer II Topcon GR 3 and GR 5 Topcon MC R3 Topcon NETG3A Topcon TruPath AGI 3 NovAtel PROPAK G2 Plus NovAtel FLEXG2 STAR NovAtel FLEXPAK G2 V1 FLEXPAK G2 V2 and FLEXPAK6 NovAtel PROPAK V3 NovAtel DL V3 Septentrio PolaRx3e and Septentrio AsteRx3 Timing receivers FEI Zyfer UNISync GPS PRS TruePosition GPS timing receiver Symmetricom SSU 2000 Motorola M12M Symmetricom Time Provider 1000 1100 Furuno GT 8031 Symmetricom TimeSource 3500 XR5 Navstar Symmetricom Trimble Resolution T Trimble Accutime Gold Trimble Resolution SMT Trimble MiniThunderbolt NovAtel OEMStar NovAtel OEM4 and NovAtel OEMV3 Space Based Receivers Lab testing has been conducted at the NASA Jet Propulsion Laboratory JPL in California The receivers are used by NASA for space based missions and high precision science applications The TWG agreed that these would be tested at JPL by NASA with participation by LightSquared personnel and the results provided to the TWG see Appendix G The devices tested are current or representative of GPS receivers in use by NASA or planned for use in the near future for space and science applications TriG NASA Nextgeneration Space Receiver and IGOR Space Receiver NASA JPL also tested the following high precision receivers and shared FIGURE 7 Pseudorange phase of four signals transmitted by the new K1 satellite courtesy of Topcon Positioning Systems FIGURE 8 Signal to noise ratios of four signals transmitted by the new GLONASS CDMA continued from the new satellite provide an additional accuracy advantage over older satellites FIGURES 7 and 8 show data the results with the HPT N sub team JAVAD Delta G3T High Precision IGS and Ashtech Z12 High Precision IGS Conclusion For all sub teams analyses will consider both LightSquareds expected transmit power of 62 dBm per channel and its maximum authorized transmit power of 72 dBm per channel The WG co chairs will update the Commission on its progress in a subsequent report on May 16 The April 15 TWG report contains these appendices Working Group Roster List of Receivers and Devices Aviation Test Procedure Cellular Test Plan Draft General Location Navigation Test Plan Draft High Precision Networks Timing Test Plans Draft Space Based Receivers Test Process K1 satellite courtesy of Topcon Positioning Systems from the companys Moscow office Finally the German Aerospace Centers Institute of Communications and Navigation recorded the spectrum Expert Advice continued from page 8 integrity monitoring interference mitigation system Peter Soar SALLY BASKER former director of research and radionavigation at the General Lighthouse Authorities of the UK and IReland has opened Sally Basker Consulting strategy business and technology advice with expertise in navigation services See www baskerconsulting com GPS World May 2011 www gpsworld com 14