October 19, 2007
Investigation into a Proton-M rocket failure in September, which appeared to threaten the schedule for continued rebuilding of the GLONASS constellation, has cleared the launcher and Baikonur facility for renewed activity, including a scheduled October 25 launch of three GLONASS-M satellites.
Ventures • October 18, 2007
Next April’s Toulouse Space Show will provide a good deal of company for the European Navigation Conference (ENC-GNSS 2008).
In addition to the annual European Frequency and Time Forum (EFTF 08), which joined ENC-GNSS 2007 this year at TimeNav '07 in Geneva, Switzerland, events include a Space Applications symposium sponsored by the French space agency CNES, a commercial exhibition, and associated events for the general public, students, and young people, to promote the value of space applications in daily life.
October 31, 2007
Swedish technology group Hexagon AB, which acquired Leica Geosystems in 2005, launched its tender offer to acquire all the issued and outstanding common shares of NovAtel Inc., a Calgary, Alberta, Canada–based developer and manufacturer of OEM GNSS and related products, at a price per share of US$50 cash.
New Builds • October 4, 2007
Trimble has introduced a new, real-time kinematic (RTK) compact GNSS card — the Trimble BD960 — for high-precision guidance and control applications, such as unmanned vehicles and port and terminal equipment automation.
September 26, 2007
GLONASS has gotten “preliminary approval” to add code division multiple access (CDMA) signals to future satellites.
Since its initiation in the early 1980s, the Russian GNSS system has employed frequency division multiple access (FDMA) techniques in which the same code is used for the signals broadcast by the system, with individual spacecraft being distinguished from one another by a specific frequency allocation. Russia would almost certainly continue broadcasting FDMA signals on existing frequencies.
September 18, 2007
NovAtel Inc. has acquired privately held antenna manufacturer Antcom Corporation (Antcom) for $5 million in cash and an additional $1 million in cash subject to Antcom's achievement of certain financial targets for the calendar year ended December 31, 2007.
September 12, 2007
Operators of the world’s four GNSS systems and regional augmentation systems have laid the foundation for a multilateral environment in which to discuss issues of compatibility and interoperability.
September 9, 2007
The September 6 crash of a Russian Proton-M rocket carrying a Japanese telecommunications satellite (JCSAT 11) has injected an element of uncertainty into plans for completing the GLONASS constellation.
Russia’s Baikonur cosmodrome automatically suspended all Proton rocket flights, pending an investigation, after the failure of the rocket, which crashed in the steppes of Kazakhstan just over two minutes after lift-off. Russia rents the space facility from Kazakhstan, a former republic in the USSR.
Inside GNSS • September/October 2007
In-band radio frequency interference (RFI) is a serious threat to the reliable operation of GNSS receivers. When the RFI power level is high enough to render the GNSS receiver inoperable, usually no visible external signs appear indicating that anything is out of order; so, the user initially assumes the receiver has experienced an internal failure.
Working Papers • September/October 2007
The emergence of a multi-GNSS world will inevitably require the civil GNSS user community to address the issue of signal authentication: confirming that a pretended identity of a user or transmitted information is, in fact, real and correct.
This two-part column focuses on the concepts and methods for achieving authentication in GNSS operations. In the July/August issue, the column began by introducing some of the cryptographic concepts, terminology, and techniques used to develop and implement authentication methods in navigation systems in general.