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Philadelphia District. US Army Corps of Engineers. RTK-GPS for Dredging. Why Where How Much The Pay Back – Time - Accuracy Production monitoring $$$$. Improved Accuracy for both positioning & depth Knowing the exact draft of the vessel enables increased accuracy for dredge cuts

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Philadelphia District

US Army Corps of Engineers


RTK-GPS for Dredging

  • Why

  • Where

  • How Much

  • The Pay Back –

    • Time - Accuracy

    • Production monitoring

    • $$$$


Improved Accuracy for both positioning & depth

Knowing the exact draft of the vessel enables increased accuracy for dredge cuts

Decrease possibilities of missing spot shoals

Dredging around piers & pilings

I am sure you know more reasons than me to improve dredge position accuracy

RTK-GPS for DredgingWHY


Virtual Reference System -

RTK – GPS !!!!

What next !!!!

RTK - GPS BecomesVRS – RTK - GPS


No more negotiating with local residents or businesses to put equipment up for the duration of a project

No more dead batteries or power failures slowing or stopping work

No more radio interference causing incorrect positions

Virtual Reference Station RTK - GPS


What is this new term?

VIRTUAL - RTK- GPS

Virtual Reference Station RTK - GPS


Defined – A number of Continually Operating Reference Stations (CORS) connected by a network that computes real time (1/sec) GPS measurement corrections for an intermediate position used as a base station (virtual) when conducting RTK-GPS surveys.

Virtual Reference Station RTK - GPS


Have your Dredge show up for a job and just start working

Not worry about tide stations

Cut Accurate side slopes

Not worry about cutting too shallow or too deep

Accurately monitor production

Would you like to:


VRS-GPSCan be integrated with

  • COE Silent Inspector

  • Hypack – Dredge Pack

  • Other custom -production monitoring programs


Where did it come from?

COE & DOT survey departments looking to improve efficiency and repeatability when performing surveys

Being used in Europe by many industries

Commercial groups are starting networks

VRS – RTK - GPS


At this moment it is coming online in the Philadelphia District

Once fully established in Philadelphia it is planned to expand through NAD

We have received inquiries from various districts in SAD & MVD

RTK-GPS for DredgingWhere


USA

Various State DOT Departments

Commercial groups

Colleges & Universities

COE - Philadelphia

RTK-GPS for DredgingWhere


North Carolina Geodetic Survey

South Carolina Geodetic Survey

Minnesota DOT

Ohio DOT

Texas DOT

Puget Reference Network (Washington State)

Texas Cooperative Network

University of Minnesota

VRS - RTK-GPS for DredgingWhere


Europe

Austria, Belgium, Denmark, Finland

Germany, Norway, Sweden

Switzerland, United Kingdom

Japan

RTK-GPS for DredgingWhere


Typical Dredge installation

RTK-GPS receiver = $20,000

Laptop / work station = $3,000

Proxy-Cast Cellular Network Router = $1,000

Total - $24,000

RTK-GPS for DredgingHow Much?


VRS-RTK-GPS Typical Components

  • Laptop

  • Proxy Cast Cellular

  • Data Collector (optional)

  • RTK-GPS receiver


The default base station position remains fixed at the initial position determined during the first connection of the day

Optionally the VRS base location can be set to update at specific intervals from the original location

Good option for Hydrographic and Beach surveys

VRS base position update


Philadelphia DistrictVRS-GPS Network


The Following Slides show some of the areas that the VRS-GPS Network is being used to improve Production

New Projects and Applications are Being added to the List

USACE VRS-GPS Network In Production


VRS-GPS Rover Deployed in Remote Areas


Quick survey team response

Little or no stable control in the area

Often calibration is performed several miles outside of the immediate project area

Fast data acquisition

Accuracies within project tolerances (0.1’v)

Additional Rovers for data collection

VRS-GPS Rover Deployed in Remote Areas


ATV - Used for Beach Surveys


Immediate Response to Pre and Post Storm Surveys – Destroyed Control is No Longer an Issue

Regional Models are Now Surveyed with a Uniform Control Network – Island to Island Network Variations are Eliminated

Contractors can be Given a User Name & Password that is Active while working on COE Projects

ATV – Used for Beach Surveys


RTK / NOAA PortsComparison

  • Single Baseline Base

  • 185’ Light House

  • 85 Watt Radio

  • ~163 MHz VHF

  • 10 to 30 Km

  • 0.1 to 0.25 tide comparisons

  • Using Geoid 2003


RTK / NOAA PortsComparison

  • Delaware Bay

  • Brandywine Light

  • 10 KM from RTK Base

  • <0.1’ Difference

  • Repeated readings

  • Various tide / current conditions

  • Various GPS constellation conditions


RTK / NOAA PortsComparison

  • Delaware Bay

  • Ship John Light

  • 30 KM from RTK Base

  • +/-0.2’ Difference

  • Repeated readings

  • Various tide / current conditions

  • Various GPS constellation conditions


RTK / NOAA PortsComparison

  • Single Baseline

  • 0.1’ to 0.3’agreement

  • VRS-GPS

  • Constant 0.1’ agreement

  • Testing Continues

  • Full Documentation Before Implementation


Navigation Surveys & Dredging

Survey Vessel With VRS-GPS Installed


Monitoring Dredge Production Using VRS-GPS

  • COE Silent Inspector

  • Hypack – Dredge Pack

  • Other custom -production monitoring programs


Current Dredge Monitoring Techniques

GPS using USCG Differential = 3 to 5 m Hz & No vertical component

Nav Sat = Horizontal ? & No Vertical component

Pressure sensors for draft & load measurement +/- 0.5’ typical

RTK – GPS = 0.2’ Vertical

Monitoring Dredge Production Using VRS-GPS


Typical Hopper Dredge Capacity

100’ long x 20’ wide = 2,000 sq ft

+/- 0.5’ pressure sensor = +/- 37 yards

+/-0.2’ RTK-GPS = +/- 14 yards

37 yards @ $25.00/ yard = +/- $925.00

14 yards @ $25.00/ yard = +/- $350.00

It adds up in the long run

One More ExampleProduction Monitoring


The survey industry is heading in this direction

A uniform control network in the region

Cellular connections Vs Radio

Accuracy is constantly monitored by the network operator

Accounts can be setup and billed as used or you can become a network partner

Just some food for thought


Questions or Comments

Some of the items discussed in this presentation are application ideas developed by the author and not presently in production or use by the COE


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