Global Navigation Satellite Systems Engineering, Policy, and Design
A close brush by a passing typhoon on its opening day aside, NaviForum Shanghai 2010 mustered an impressive slate of senior executives from Chinese companies working in the navigation and telematics/location based services (LBS) field.
By Inside GNSS
The United States remains the current leader in space competitiveness, but its relative position is eroding in the face of increased funding, streamlined policy, and industrial improvements in other space-faring nations.
By Inside GNSS
GLONASS-M satellite. Figure/photo, JSC “Academician M.F. Reshetnev “Information Satellite Systems”A Proton-M carrier rocket successfully launched three GLONASS-M satellites into orbit early this morning (September 2, 2010, Moscow time) from the Baiknour space center in Kazakhstan. Another launch on November 30 will send three more M-type satellites into orbit, and the first GLONASS-K is scheduled to go up on December 25.
The imminent completion of a full constellation by the end of the year is accompanied by a vigorous policy initiative to promote Russia’s revitalized GNSS.
By Inside GNSS
SVN62 launch (ULA)The U.S. Air Force declared the first GPS Block IIF satellite (SVN62) operational today (August 27, 2010), changing the spacecraft’s navigation signal status to healthy at about 10:10 a.m. (EDT or 4:10 a.m. UTC).
Launched May 28, the satellite became the responsibility of the USAF 50th Space Wing on August 26,
By Inside GNSS
High-precision users of GNSS are used to solving for carrier phase integer ambiguities, but the recent publication of a GPS technical document has fixed a different kind of phase ambiguity — a linguistic one
By Inside GNSS
GB-GRAM-M (GPS Wing)Rockwell Collins has delivered 21 prototype Ground-Based GPS Receiver Application Module Modernized (GB-GRAM-M) receivers that the Cedar Rapids, Iowa– headquartered company developed under the GPS Wing’s receiver card development program.
By Inside GNSS
Hemisphere GPS has signed a multi-year exclusive agreement to supply the S3-S Navigator — a customized Outback S3 precision guidance system — for Summit Liability Solutions. Both companies are based in Calgary, Alberta, Canada.
By Inside GNSS
Applanix recently released Version 5 of its Position and Orientation System for Land Vehicles (POS LV).
According to the company, the system uses integrated inertial technology and is designed to generate stable, reliable and repeatable positioning solutions for land-based vehicle applications such as road geometry, pavement inspection, GIS database and asset management, road surveying and vehicle dynamics. The company says the unit is designed to operate under the most difficult GPS conditions in urban and suburban environments.
By Inside GNSS
Artist’s rendering of GPS III satellite. Lockheed Martin imageMore than two years into a multi-billion-dollar contract, the Lockheed Martin team developing the U.S. Air Force’s next-generation GPS Block III satellites continues to defy the physics of large aerospace programs by successfully completing the program’s Critical Design Review (CDR) phase last week — two months ahead of the baseline schedule.
By Inside GNSS
The GPS Wing has authorized publication of three technical documents with updated specifications for the U.S. Global Positioning System, including the next-generation GPS Block IIIA satellites now in development, the L5 radio link, and the new L1 civil signal (L1C) that will be available with the GPS III spacecraft.
By Inside GNSS
GPS-related procurement and development items in President Obama’s proposed budget for fiscal year 2011 are moving through Capitol Hill, but not without contention. At issue is Obama’s request for $40.9 million for the High-Integrity Global Position System (HIGPS, also known as iGPS).
By Inside GNSS
In recent years, researchers have explored possible new allocations for Radio Determination Satellite Service (RDSS) and Radio Navigation Satellite Service (RNSS) spectrum from a regulatory point of view. These studies have mainly discussed S-band and C-band in addition to L-band.
The International Telecommunications Union (ITU) Radio Regulations define RNSS as a subset of RDSS. Although the allocations are differentiated — RDSS usually has a paired uplink — both can actually be used for satellite navigation.
By Inside GNSS
Q: Is it possible to define a fully digital state model for Kalman filtering?
A: The Kalman filter is a mathematical method, purpose of which is to process noisy measurements in order to obtain an estimate of some relevant parameters of a system. It represents a valuable tool in the GNSS area, with some of its main applications related to the computation of the user position/velocity/time (PVT) solution and to the integration of GNSS receivers with an inertial navigation system (INS) or other sensors.
By Inside GNSS
