# Presentation: 757202

## CORS USERS FORUM

- Real Time GNSS Networks
- Tennessee DOT

- Jim Waters, PE, RLS
- Assistant Director TDOT Design Division

## 22 GNSS Reference Stations 
All National CORS
Aligned to NSRS
2 GNSS Reference Stations
Submitted to NGS for National CORS Inclusion.
20 Proposed GNSS Stations
Planned National CORS Sites.
Possible Mount Change
Additional GNSS Stations T.B.D.

- All National CORS
- Aligned to NSRS
- 2 GNSS Reference Stations
- Submitted to NGS for National CORS Inclusion.
- 20 Proposed GNSS Stations
- Planned National CORS Sites.
- Possible Mount Change
- Additional GNSS Stations T.B.D.

- TDOT GNSS Reference Network

## TDOT GNSS Reference Network

## TDOT GNSS Reference Network(With Proposed Stations)

## Hardware Components
GNSS Receiver
Topcon Net G3 Receivers
GNSS Antenna
Topcon G3 A1 Antennae
Mounting Bracket
Custom Steel Brackets 
Cables
Times Microwave LMR 400 (<50 meters) and LMR 600 (>50 meters).

- GNSS Receiver
- Topcon Net G3 Receivers
- GNSS Antenna
- Topcon G3 A1 Antennae
- Mounting Bracket
- Custom Steel Brackets
- Cables
- Times Microwave LMR 400 (<50 meters) and LMR 600 (>50 meters).

- TDOT GNSS Reference Network

## Hardware Components
Servers
One data storage server
One network access server
IT Network
All receivers connected behind firewall to TDOT IT Infrastructure.
Connected to 100 mbps switches.
Uninterrupted Power Supply 
In-Line Lightening Protection

- Servers
- One data storage server
- One network access server
- IT Network
- All receivers connected behind firewall to TDOT IT Infrastructure.
- Connected to 100 mbps switches.
- Uninterrupted Power Supply
- In-Line Lightening Protection

- TDOT GNSS Reference Network

## Software Components
Topcon TopNET Software
TopNET-S is the server component which manages reference stations.
TopNET-V is the network correction software for both single base line solutions and modeled network solution.  
TopNET-R is the remote user component for monitoring receivers and changing receiver configurations.
TopNET Web is the web interface for network information.
Download Center is responsible for downloading all raw data files.

- Topcon TopNET Software
**TopNET-S** is the server component which manages reference stations.
**TopNET-V** is the network correction software for both single base line solutions and modeled network solution.
**TopNET-R** is the remote user component for monitoring receivers and changing receiver configurations.
**TopNET Web** is the web interface for network information.
**Download Center** is responsible for downloading all raw data files.

- TDOT GNSS Reference Network

## TDOT GNSS Reference Network

## TDOT GNSS Reference Network

## TDOT GNSS Reference Network

## TDOT GNSS Reference Network

## TDOT GNSS Reference Network

## TDOT GNSS Reference Network

## TDOT GNSS Reference Network

- Current Phase?
- TDOT Staff Using Network Daily for Survey Applications
- Manufacturers have been testing with TDOT Network:
- Topcon
- Trimble
- Leica
- Eagle Point
- Carlson

## TDOT GNSS Reference Network

- Future Plans
- Agreements with other State of TN Agencies for supplemental reference stations.
- Public Sector User Agreement under development, planned public access scheduled for December 2008.
- User fees will be charged to cover TDOT costs in support of public sector access.

## TDOT, Topcon, & Hayes Instrument Installation Team

## TDOT GNSS Reference Station

- Website:
- http://tdotcors.state.tn.us:8080/TopNETweb/
- Contact Information:
- Jim Waters, PE, RLS
- TDOT Design Division
- Suite 1300, James K. Polk Building
- Nashville, TN 37243
- (615) 741-0450
- Jim.Waters@state.tn.us