Why are the two GPS Transmitter frequencies (1575.42 and 1227.6 MHz) coherently selected integer multiples of 10.23 MHz master clock? Question posted on CANSPACE on October 30, 2006, by Sivaraman Ranganathan. The document defining the GPS signal, IS-GPS-200, states that “The carrier frequencies for the L1 and L2 signals shall be coherently derived from a common frequency source within the... read more
Why are GLONASS satellites launched on Christmas Day? Question posted on CANSPACE on December 10, 2006, by Kerry Matthews The latest triple-satellite GLONASS launch occurred on December 25th at 23:18 Moscow Time. This launch is the sixth GLONASS December launch in a row. In fact, all 9 launches since December 1995 have occurred in the last month of the year... read more
Innovation: The International GNSS Service: Any Questions? (PDF) By Angelyn W. Moore Published: January 2007 GPS World In this month’s column, Angelyn Moore, the IGS Central Bureau’s deputy director, overviews the organization’s service, history, and future, demonstrating that the IGS is a model of scientific collaboration of which not just the GNSS community but the whole world should be proud.—Richard... read more
Cingular Wireless has launched its first generally available, location-based service with TeleNav Inc's GPS Navigator. Cingular business and government customers can get turn-by-turn voice and onscreen GPS directions, while driving or walking, on Cingular business devices. read more
Philips Electronics abruptly pulled the plug on plans to enter the personal navigation device (PND) market. read more
Looking out the window during a long car trip becomes an interactive adventure with a new GPS-based game developed by The Interactive Institute in Stockholm, Sweden. read more
The use of satellite navigation in civil aviation and other safety-critical navigation applications drove the development of satellite-based augmentation systems and differential networks to track and augment GPS, providing the prerequisite levels of accuracy, integrity, coverage, and availability. read more
Galileo Guess Who; Old Block IIA Sat Reactivated for Tests; GPS III Faucet Opened read more
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