Expert Advice: The Tigers Claim Their Territory
July 1, 2015
Report from the 2015 China Satellite Navigation Conference By Greg Turetzky This May, the sixth China Satellite Navigation Conference […]
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Report from the 2015 China Satellite Navigation Conference By Greg Turetzky This May, the sixth China Satellite Navigation Conference […]
Europe is looking at the imposition of Galileo as part of an A-GNSS technology push for E112 emergency calling applications. E112 processes currently do not specify performance criteria for the position location accuracy.
By John Pottle and Neal Fedora Precision matters. While “accuracy” is somewhat one-dimensional, “precision” is multi-faceted. We submit […]
A leap second will be introduced this year at 23:59 on June 30. This phenomenon comes around periodically and is necessary for keeping UTC in line with the Earth’s slowing rotation. Although it will pass unnoticed by most, it has implications for anyone involved in the development of GNSS-enabled devices. For some, it can be the cause of a major headache.
Concerns raised about cascaded Kalman filters for loose coupling and/or usage of input data “massaged” in unknown ways are not new, but are routinely excused by requirements to use coordinates from receivers not providing measurement outputs. Often, however, a receiver’s internal 8-state extended Kalman filter (EKF) is not fed with precise carrier phase data — and even when it is, its velocity outputs (being both filtered and unaided) have limited ability to follow high dynamics. Velocity pseudomeasurements under those conditions interfere with IMU aiding.
By adhering to the principles of independence, openness, compatibility, and gradualness, China is steadily accelerating the construction and development of the BeiDou Navigation Satellite System.
The BeiDou System already provides continuous and reliable Full Operational Services to most parts of the Asia-Pacific region. Its positioning, navigation, and timing performance keeps improving, while the deployment for a global constellation is also making progress. The BeiDou System and its products, which are compatible with other navigation satellite systems, have been gradually applied in many sectors and industries related to the national economy and to entering the mass market.
By John Lavrakas, Advanced Research Corporation What a difference eight years can make! My September 2006 GPS World article […]
I attended the China Satellite Navigation Conference in Nanjing in May, the fifth year of CSNC and […]
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