Global Navigation Satellite Systems Report of a Joint Workshop of the National Academy of Engineering and the Chinese Academy of Engineering (2012) / Chapter Skim
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Summary of the Workshop--As Reported by Grace Xingxin Gao
Summary of the Workshop--As Reported by Grace Xingxin Gao
Pages 1-10
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and Chinese delegations exchanged knowledge and discussed GNSS compatibility and interoperability, system monitoring and service improvement, satellite navigation terminal and application technology, as well as talent exchanges. The key outcomes of the workshop follow.
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These operational satellites included: 11 GPS Block IIA satellites, 12 GPS Block IIR satellites, 7 GPS Block IIR-M satellites, and 1 GPS Block IIF satellite. The GPS IIA satellites initiated the Block II series.
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Ran Chengqi, director, China Satellite Navigation Office, and Tan Shusen, a researcher with the Beijing Global Information Center of Application and Exploitation, stated that the Compass Navigation system will follow a "three-step" deployment, from regional to global, and from active to passive. The Compass system aims to achieve regional passive service coverage by 2012 and global passive service coverage by 2020.
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. In the upcoming decade, GPS signals will be modernized, the Russian GLONASS satellite constellation will be rejuvenated, and the following new sys tems will become operational: Chinese Compass, European Galileo, and Japanese QZSS.
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for monitoring the performance of multiple GNSS systems. iGMAS is divided into the following layers: constellation state layer, spatial signals layer, naviga tion information layer, and service performance layer.
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These reference networks could be augmented by new reference stations located in the Arctic. Second, an Arctic SBAS would not be able to use geostationary satellites to broadcast the data to Arctic users, but could use low Earth orbiting satellites (LEOs, e.g., Iridium)
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broadband transmitters in radio spectrum previously reserved for weak space-to-Earth sig nals adjacent to the faint GPS signal. With a trans mitter spacing of 400 to 800 m in cities, the LSQ signal would be more than 5 billion times more powerful than the GPS signal.
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Its responsibilities are frequency spectrum monitoring, interference detection and investigation, matters of electromagnetic interference coordination, and maintenance of the transmission of radio waves in the air. Receivers with the capability of tracking multiple GNSS systems may achieve better accuracy and integrity compared to those that track a single GNSS system.
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Other applica tions include: a hydrological data collection system at the Three Gorges of the Yangtze river; a detection system for forest fires; an inspection and monitoring system for high-voltage power lines in remote areas; a system for environmental protection and energy conservation in shipping on the Yangtze River; a vehicle navigation system for all vehicles to share location information and reduce the severity of traffic jams; and a two-way timing service that provides a standard of high accuracy time and frequency for upgrading the old power grid.
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it is beneficial for technology advancement and construction of the BeiDou system and GPS system to strengthen technical exchanges and coopera tion between CAE and NAE in the GNSS field; (2) it is valuable to enhance academic exchanges and mutual understanding between technical personnel on both sides to improve technologies together; and (3)
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