Trimble GNSS Infrastructure

Trimble GNSS Infrastructure

A History of Innovation Trimble, the first company to offer commercial GPS products company to integrate GPS with communications technology RTK system in the market in 1994 company to provide integrated GPS and mapping software capability for mobile phones company to offer the full range GPS equipment tracking all available signals GPS (L1, L2, L2C, L5*) GLONASS (L1, L2)

Positioning Applications Construction Surveying GIS In-vehicle Navigation Infrastructure Agriculture Wireless Infrastructure Asset & Fleet Management Portable Devices

Accuracies Single/Multi Station Systems for RTK Trimble VRS Technology (RTK / DGPS)

Single Station RTK RTK corrections

Limitations of single base RTK Local base station NO integrity monitoring Productivity loss Security Communications Power Supply PPM

Systematic Errors Ionosphere Troposphere Satellite Orbit Errors Satellite Clock Errors Multipath

Trimble Infrastructure Portfolio (Software) Scalable Approach Trimble VRS GPSNet GPSBase

Trimble VRS Technology

Applications for Trimble VRS Cadastral Surveying GIS - Mapping Dam - Monitoring Large Construction Areas Agriculture Precise Farming Hydrographic Surveying Machine Control - Navigation Road Railway Construction Utility Companies Marine Applications

Trimble VRS how does it work?

NTRIP Central User Field Permanent GNSS Rover in user Caster server Data the operates field is communicates computes makes provides receives Reference streamed with enhanced realtime Stations LAN efficiency GPSNet. list via of with correction connection available data Internet data. receive to and GPSNet model NTRIP User corrected GNSS links quality selects to server for signals provides control. central for the custom area via mountpoint local 24/7 processing wireless solution for Internet atmospheric server users location conditions.

Requirements for Trimble VRS Accuracy for the User in the field Based on standards Reliability!!! Running 24/7 (Hardware & Software) Providing Network Information Alarm System Report System Backup System Backup Data Line User / Data Security

11 year solar cycle, observed number of sunspots

11 year solar cycle, predicted number of sunspots http://science.nasa.gov/ssl/pad/solar/sunspots.htm rough times are coming up soon again

A global VTEC map, calm ionosphere Vertical Total Electron Content on a global map, as derived from GPS base station observations

Trimble Zephyr Geodetic Trimble Zephyr Geodetic Model 2 Stealth Technology

Phase Center Stability

Trimble Zephyr Geodetic Model 2 Tracking capability GPS: L1/L2/L2C/L5 (when available) GLONASS: L1/L2 Galileo E1, E5A, E5B, and E6 (when available)

Rover Integrity / Rover Monitor

Coordinate Monitoring

Reports and Alarm System

Benefits of VRS Networking Less investment for the user Significantly reduces systematic errors Extended operating range with improved initialization and accuracy Increased productivity Autonomous surveying

Benefits of VRS Networking Provides integrity monitoring Provides alarm monitoring system Uses established communications VRS for post-processing All users in common, established coordinate frame

Trimble VRS Support Worldwide AM POC POC Europe ROW Customer Issues Knowledge Base POC

Why Use the Internet in the Field? Connected Site Download data to the field while you survey No more returning to office for forgotten coordinates More productivity Future is bi-directional communications

Survey Controller The World of Wireless Internet GPRS theory Up to 4 links to the network Each link capable of up to 13.4 Kps Highly unlikely to achieve this Voice transmissions share the same channels Voice has priority Bandwidth available is constantly changing Poorer signal reception=smaller bandwidth

Survey Controller - GPRS Limitations Up to 4 links with one dialup 13.4 Kps each Depends on number of users Voice is priority Could lose links and have lower bandwidth Areas of poor coverage Why not use VPN or HTTPS streams for GPRS? Doing this provides processing overheads and latency resulting in reduced bandwidth Potential for the future (UMTS)

Survey Controller RTK on Demand example Data flow differences RTK on demand KB 1600 1400 1200 1000 800 600 400 200 Without RTK on demand Using RTK on demand 0 0 5 10 15 20 25 30 35 40 45 50 55 60 Time (minutes)

Survey Controller RTK on Demand example Bandwidth usage/availability Bandwidth max available bandwidth CMR+ 12 svs

Security Trends In Mobile Data Communications Often they will not allow remote access to the device Mobile phone technology advances and becomes more powerful, threats from viruses and hackers increase This is a huge problem for our kind of application

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