Trimble Research & White Papers

Learn new methods and solutions to improve your workflow and gain a deeper understanding of how Trimble technologies can help you overcome the industry challenges that you face. 

Complete Integrated Aftershock System Provides Quick and Easy Solution for Rapid Aftershock Deployment, 2015

Aftershock study provides practical information for local authorities regarding the post earthquake activity, which is very important in order to conduct the necessary actions for public safety. Learn how the Trimble REF TEK High Resolution Aftershock System, Model 160-03 meets the critical requirements for rapid aftershock mobilization. 

Dynamic Station Coordinates Approach to Improve Network/Field Performance, 2015

This whitepaper examines two different approaches when using coordinates from reference station in a VRS/RTKNet Network. Learn how to avoid the influence of biased position information during Network-RTK positioning.

Trimble Pivot Solutions for the Ionosphere and Solar Maximum, 2013

Learn how Trimble Pivot platform enable users and operators to counter the effects of the ionosphere, view and analyze ionospheric conditions, and monitor positioning accuracy to verify system performance.

GNSS Modernization and its Consequences on Reference Station Network Solutions, 2007
Learn new approaches on how to deal with multitude of signals and the heterogeneity of the network reference stations in order to generate optimal network corrections for the user in the field.

Federated Filter Approach for GNSS Network Processing, 2006

This paper presents the technical aspect and performance analysis of the federated filter approach.

A New Method to Model the Ionosphere across Local Area Networks, 2005
Learn how this new method of extracting characteristic parameters to describe the ionosphere across a network of reference stations using GPS measurements can lead to improved processing of the measurements.

Trimble Integrated Surveying Techniques, 2005

Learn how Trimble products support Integrated Surveying for real-life survey applications and techniques that combine, transfer and process data from GPS and conventional instruments.

Support of Network Formats by Trimble GPSNet Network RTK Solution, 2005

The GPSNet software provides interfaces to geodetic dual-frequency GPS receivers of all major manufacturers, supports all industry standards including RTCM, CMR and NTRIP

Scalable GPS Infrastructure: The Building Blocks of Tomorrow, 2005

GPS infrastructure can be said to be essential to the growth and development of the surveying community. Here's why.

Will Galileo and GPS L5 Obsolete Network RTK? 2004

Theoretical analyses and simulations show that with the presence of a reference station network, RTK initialization and positioning accuracy are improved considerably.

FAMCAR Approach for Efficient Multi-Carrier Ambiguity Estimation, 2004
This paper starts with overviews of ambiguity resolutions techniques, and especially the ones designed for use with the new three (and more) carrier GNSS.

GALILEO/Modernized GPS: A New Challenge to Network RTK, 2004

Several preliminary studies have demonstrated that with the third/fourth frequency available from GALILEO and modernized GPS, the reliability and productivity of single base OTF (on the fly) initializations at the rover increase dramatically when comparing with a dual frequency RTK system.

Three and Four Carriers for Reliable Ambiguity, 2004

The new Factorized Multi-Carrier Ambiguity Resolution (FAMCAR) approach for efficient combination of multi-carrier data was used to analyze OTF ambiguity resolution performance.

The Factorized Multi-Carrier Ambiguity Resolution FAMCAR Approach for Efficient Carrier-Phase Ambiguity Estimation, 2004

The proposed addition of a third carrier to the modernized GPS as well as the implementation of three carriers in the planned Galileo system will boost the performance of carrier-phase based positioning within the next decade. In principle, highly-reliable instantaneous (one-epoch) ambiguity resolution becomes feasible for a broad range of applications.

NTRIP- Application and Benefit in Modern Surveying Systems, 2004

This paper discusses the theoretical and technical basics of NTRIP and illustrates the practical application of the technique using the Trimble Survey Controller software.

New Tools for Networked RTK Integrity Monitoring, 2003

Ionospheric linearity indicators (IRIM and IRIU) are very useful tools to predict the rover performance. Such measures can improve the RTK reliability and productivity of rovers working in a networking system.

Troposphere: Signal or Noise?, 2003

This paper assesses real time ZTD estimation with post-processing results.

Virtual Reference Stations Versus Broadcast Solutions in Network RTK, 2003

This paper provides analyses of different scenarios to quantify and qualify all the arguments behind the two methods of the Network RTK technique: generation of Virtual Reference Station (VRS) data and the transmission of broadcast formats.

Virtual Reference Station (VRS) Systems for Improved Efficiencies in Port Operations, 2002

A VRS and RTK system is a precise and accurate system for vertical measurements over a large site. Employing RTK and a VRS at a port lowers the cost of surveying and positioning, increases productivity, and improves the accuracy of 3D positioning.

Network RTK: Concept and Performance, 2002

This paper gives a quantitative assessment of the data characteristics leading to the known rover performance improvements using data from various RTK/VRS networks from Asia, Europe, Australia and the U.S.A.

Virtual Reference Station Systems, 2002

This paper describes in detail the Virtual Reference Station (VRS) concept and the current status of broadcast format implementations.

Broadcast Network RTK - Transmission Standards and Results, 2002

This paper presents a new Network RTK data transmission format that has been formulated within the RTCM-Version 3 framework. The new format encompasses both single-reference and network correction layers and is scaleable to city-, county- and nation-wide coverage

Network RTK Versus Single Base RTK - Understanding the Error Characteristics, 2002

This paper gives a quantitative assessment of the data characteristics leading to the known rover performance improvements using data from different RTK/VRS networks from Asia, Europe, Australia and the U.S.A.

GPS Antenna Design and Performance Advancements: The Trimble Zephyr Antenna, 2001

The Trimble Zephyr and Zephyr Geodetic antennas are two new types of survey-grade, dual-frequency, GPS antenna. They are designed to match the performance of the Choke Ring antenna, while being smaller, lighter, and significantly less expensive.