Archives

GPS Transmitter Frequencies

January 16, 2007 - By

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

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Why are GLONASS satellites launched on Christmas Day?

January 16, 2007 - By

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

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Innovation: The International GNSS Service: Any Questions? (PDF)

January 1, 2007 - By

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

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Out in Front: Best Intentions

January 1, 2007 - By

The magazine has not carried much GLONASS news in recent months, yet we continue to cover Galileo and we devoted several pages to Beidou in December. In all three cases, we find an absence of real news. read more

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Seen + Heard: GPS Adventure Game Out the Window

January 1, 2007 - By

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. The Backseat Playground uses GPS to turn passing sights such as forests, buildings, and rivers into locations for in-game characters and events, reports New Scientist magazine. Backseat Playground consists of a GPS receiver, a handheld computer, and headphones connected to a laptop in the trunk of the car. read more

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The Business — January 2007

January 1, 2007 - By

Pay As You Drive Insurance Gets Brit Road Test; Philips Exits PND Market before Entry; Driving for Dollars: Urban Challenge Purse Put at $3.5 million read more

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The System — January 2007

January 1, 2007 - By

Galileo Guess Who; Old Block IIA Sat Reactivated for Tests; GPS III Faucet Opened read more

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Business Outlook: Critical GNSS: Safety, Financial, and Legal

January 1, 2007 - By

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

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