 | The Kinematic GPS Challenge: First Gravity Comparison Results
March 14, 2012
Blog By: Theresa Diehl The National Geodetic Survey (NGS) has issued a “Kinematic GPS Challenge” to the community in support of NGS’ airborne gravity data collection program, called Gravity for the Redefinition of the American Vertical Datum (GRAV-D). The “Challenge” is meant to provide a unique benchmarking...More>> |
 | A Comparison of Lidar and Camera-Based Lane Detection Systems
February 3, 2012
Blog By: Jordan Britt, Christopher Rose, David Bevly Nearly half of all highway fatalities occur from unintended lane departures, which comprise approximately 20,000 deaths annually in the United States. Studies have shown great promise in reducing unintended lane departures by alerting the driver when they are drifting out of the lane. At the core...More>> |
 | Improvement of PPP-inferred Troposphere Estimates by Integer Ambiguity Resolution
December 16, 2011
Blog By: Junbo Shi GPS precise point positioning (PPP) ambiguity resolution (AR) is a challenging task for ambiguity-resolved PPP. So far, two PPP AR methods, i.e. un-differenced decoupled clock model and single-differenced between satellites model, have been proposed. Various publications have demonstrated that the...More>> |
 | The Kinematic GPS Challenge: Supporting Airborne Gravimetry Missions
November 29, 2011
Blog By: Gerald L. Mader The National Geodetic Survey (NGS) is conducting a 12-year project to re-define the vertical datum of the US. This project, referred to as GRAV-D (Gravity for the Redefinition of the American Vertical Datum), is accomplished by flying airborne gravity missions over the continental and coastal US. ...More>> |
 | Carrier-Phase Inter-Frequency Biases of GLONASS Receivers
August 25, 2011
Blog By: Lambert Wanninger The present GLONASS navigation system uses frequency division multiplexing (FDMA – Frequency Division Multiple Access) to make the signals from individual satellites distinguishable. This results in the use of several adjacent frequencies for the broadcast signals in the two frequency bands L1...More>> |
| The Role of GNSS in SAR Formation Flying
August 16, 2011
Blog By: Rob Middleton, Steve Tsitas, Yong Li, Eamonn Glennon, Peter Mumford, Kevin Parkinson, Nagaraj Shivaramiah, Rui Li, Yuanyuan Jiao, Jinghui Wu, Faisal Khan, Joseph Gauthier, Andrew G. Dempster The Garada project, funded by the Australian Space Research Program, aims to establish an Australian space engineering capability to provide a disaster-monitoring earth observation system. Satellite-borne earth observation is very important for Australia and for other countries that need to monitor...More>> |
 | On-Site Geo-Referencing of 3D Static Terrestrial Laser Scans
July 29, 2011
Blog By: Jens-André Paffenholz This blog presents an efficient procedure for directly geo-referencing static 3D laser scans. This is a worthwhile way to obtain the required transformation parameters from the local sensor-defined coordinate system to a global system. Therefore, a multi-sensor systems (MSS) is designed with a...More>> |
| Optimal Sensor Fusion for Skew-Redundant Inertial Measurement Units
May 12, 2011
Blog By: Yigiter Yuksel, Naser El-Sheimy There are some navigation applications for which the performance of current MEMS inertial units is not sufficient to achieve the desired navigation accuracy. For such applications, one of the foreseeable solutions is to use redundant number of inertial sensors together to generate more accurate...More>> |
| IGSMAIL-6355/6374 - Upcoming switch to IGS08 reference frame and the consequences to the GPS users (II)
April 12, 2011
Blog By: Ralf Schmid As announced in IGSMAIL-6354, the IGS will adopt a new reference frame called IGS08 that should be used together with igs08.atx, an updated set of receiver and satellite antenna phase center corrections. Those will replace the absolute phase center correction model igs05.atx adopted in November...More>> |
| IGSMAIL-6354 - Upcoming switch to IGS08 reference frame and the consequences to the GPS users (I)
March 24, 2011
Blog By: Jim Ray The IGS will soon adopt a new Reference Frame, called IGS08, as the basis of its products. IGS08 is closely related to ITRF2008, released in May 2010. An updated set of satellite and ground antenna calibrations, igs08.atx, will also become effective at the same time and should be used together with...More>> |
The GPS World Tech Talk blog is a resource for industry professionals and academics to share technical details surrounding GPS and GNSS systems, receivers, and applications. Every month, three new blogs are posted by international experts, discussing various aspects of GPS/GNSS navigation. The blogs are often illustrated with diagrams, photos, and formulas. They provide an excellent quick reference, and are categorized by subject matter.
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