Global Navigation Satellite Systems Engineering, Policy, and Design
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
FIGURE 1: Geographical overview of the 170 IGS stations tracking SVN62/PRN25 during its current 90-day checkout period. The blue curve illustrates the ground track of the spacecraft on August 9, 2010.For the complete story, including figures, graphs, and images, please download the PDF of the article, above.
On May 27, 2010, the U.S. Air Force successfully launched the first satellite of the Block II “follow-on” (Block IIF) series, the fourth generation of GPS spacecraft that features more precise and powerful signals, an extended design life, and several other technical advances.
By Inside GNSS
Map Africa 2010 conference and exhibition will take place at the Cape Town International Convention Centre (CTICC) in the center of Cape Town, South Africa on November 23-25, 2010.
The theme is "Geospatial Readiness for Building Africa." The conference will focus on the most pressing areas that contribute to the nation’s growth, such as infrastructure and utilities, cadastral mapping, land information management system (LIS), land policies, mining and exploration and emergency management.
By Inside GNSS
The Institute of Navigation’s Autonomous Weapons Summit (AWS) and& GNC Challenges for Miniature Autonomous Systems Workshop will be be held October 25-27, 2010 at the Emerald Coast Conference Center, Fort Walton Beach, Florida.
By Inside GNSS
Japan’s Electronic Navigation Research Institute (ENRI) will present the second workshop on Communications, Navigation and Surveillance Systems for Air Traffic Management at the Akihabara Convention Hall in Tokyo on November 11 and 12, 2010.
Registration will close on October 30, 2010.
The theme is ForeSEE: Safety, Efficiency and Environment. The conference is free and will be held in English.
By Inside GNSS
