# Presentation: 506068

## Differential GPS (DGPS) 

**Differential GPS (DGPS) **

**Reference****Station**

- Nationwide Differential Global Positioning System (NDGPS)

## Nationwide Differential Global Positioning System

- Expanding the Maritime System
-  into theNationwide DGPS

**Nationwide Differential Global Positioning System**

- Nationwide Differential Global Positioning System (NDGPS)

## What does NDGPS give me? System Characteristics

**What does NDGPS give me?**** *****System Characteristics***

**Accuracy**
**0.5 meter near the reference station**
**Can degrade up to 1 meter/150 km**
**Typical accuracy is 1 to 3 meters**
**2 to 5cm accuracy with Post Processing**
**Integrity**
**5 seconds at 100 bps**
**2.5 seconds at 200 bps**
**Availability is**** **
**>99.7% in areas of single coverage**
**>99.9% in areas of dual coverage**

- Nationwide Differential Global Positioning System (NDGPS)

## International Standard

**International Standard**

**NDGPS is designed to an international, non-proprietary standard**
**Compliant with RTCM SC-104 and ITU-R M.823 **
**Greatly increases market for manufacturers **
**Enhances Global interoperability**
**Signal is free to all users**
**35 countries operate compatible systems**
**Many other countries are planning ****systems**
**Resulting in a seamless international ****navigation system**

- Nationwide Differential Global Positioning System (NDGPS)

## Acceptance of the international standard

**Acceptance of the international standard**
**is leading to a seamless worldwide service.**

- Nationwide Differential Global Positioning System (NDGPS)

## Maritime Use

**DGPS guides every type of craft from****small pleasure boats to large container****ships**

- Nationwide Differential Global Positioning System (NDGPS)

## Army Corps of Engineers DGPS in Dredging

- Army Corps of Engineers needs 2 meter accuracy to position their dredges.

- Nationwide Differential Global Positioning System (NDGPS)

## Provide Situational Awareness
Prevent accidents, saving over $60 million per year
Reduce fuel consumption by better pacing trains
Increase rail line capacity through closer train spacing, thus reducing the need for additional capital investment in plant and equipment

**Provide Situational Awareness**
**Prevent accidents, saving over ****$60 million per year**
**Reduce fuel consumption by ****better pacing trains**
**Increase rail line capacity through closer train spacing, thus reducing the need for additional capital investment in plant and equipment**

**NDGPS Requirements*****Positive Train Control***

- Nationwide Differential Global Positioning System (NDGPS)

## NDGPS use in Surveying

- GPS has revolutionized the surveying industry.  NDGPS provides survey grade accuracy when used in post processing applications.

- Nationwide Differential Global Positioning System (NDGPS)

## Nationwide DGPS Intelligent Transportation System

**Automatically notify emergency personnel when an air bag is deployed, allowing for faster response to the exact location, thus saving some of the 41,000 people who die on U.S. roads each year.**

**Nationwide DGPS *****Intelligent Transportation System***

**An integrated vehicle safety system consisting of DGPS  & communication links will: **

**Gives drivers Situational Awareness, preventing multi-car pile-ups**
**Automatically reroute traffic****around an accident, improving****traffic flow.**

- Nationwide Differential Global Positioning System (NDGPS)

## Hydrographic Surveys and Aerial Mapping 

- Nationwide Differential Global Positioning System (NDGPS)

## NOAA’s Forecast Systems LabMeasuring Water Vapor

**NDGPS Site in Whitney, NE**

**Water vapor is the most important component of weather and the least observed.  DGPS reference stations continuously  measure the water vapor in the atmosphere above the reference station, thus greatly improving short term weather forecasts. **

- Nationwide Differential Global Positioning System (NDGPS)

## Precision Agriculture

**Maximize use of resources**
**Optimized plowing of crop rows**
**Tailored applications of seeds, fertilizer, water, pesticides**
**Improved management of land, machinery, personnel, time**
**Greater crop yields**
**Net benefit: $5-14 per acre**
**Minimize environmental impacts**
**Localized identification and treatment of distressed crops reduces chemical use**
**Precise leveling of fields prevents fluid runoff**

- Nationwide Differential Global Positioning System (NDGPS)

## Projected Coverageby the End of 2000

- Nationwide Differential Global Positioning System (NDGPS)

## Commander Len Allen

**Commander Len Allen**
***Chief Operations Planning Division***
**U.S. Coast Guard Navigation Center**
**www.navcen.uscg.mil**** **

**USCG Navigation Center**
**7323 Telegraph Road**
**Alexandria, VA 22315-3940**

**Nationwide Differential Global Positioning System (NDGPS)**

**Phone: (703) 313-5888**
**Fax:     (703) 313-5805**
**LAllen@navcen.uscg.mil**

- Nationwide Differential Global Positioning System (NDGPS)

## Nationwide DGPS 

** ****Hawk Run**

** **** **

**  ****Macon**

**  ****Grady**

**  **

**   **

**   ****Hackleburg**

**   ****Bobo**

**   **

**  **

** **

**Oberlin**

** ****Topeka**

** **

** ****Onondaga**

** ****Medford**

** ****Edinburg**

** **

** ****Medora**

** ****Billings**

** **

** ****Great Falls**

** ****Polson**

** ****Spokane**

** ****Appleton**

** ****Klamath Falls**

** ****Austin**

** **

** **

** **

** ****Bakersfield**

** ****Essex**

** ****Flagstaff**

** **

** ****Kirtland**

** ****Summerfield**

** **

** ****Pueblo**

** ****Hudson**** Falls**

**  ****GWEN Sites**
**  ****Moved or New Site**
**  ****Coast Guard Site**
**    ****Green - Operating **
**    ****Red - Planned**

** ****Whidbey Is**

** ****Robinson Pt**

** **

**Fort Stevens**

** **

**Cape ****Mendocino**

** **

**Point Blunt**

** **

**Pigeon Point**

** **

**Vandenberg**

** **

**Point Loma**

** **

**Aransas Pass**

**Galveston**

** **

**English Turn**

** **

** **

**Mobile****Point**

**Egmont Key**

** **

**Key West**

** **

** **

** **

**Miami**

**Cape Canaveral**

** **

** **

**Fort Macon**

** **

**Cape Henlopen**

** **

**Sandy Hook**

** **

**Moriches**

** **

**Chatham**

** **

**Portsmouth**

** **

**Brunswick**

** **

**Millers Ferry**

** **

**Vicksburg**

** **

**Memphis**

** **

**Sallisaw**

** **

**Kansas****City**

** **

**St Louis**

** **

**Rock****Island**

** **

**St. Paul**

** **

**Wisconsin****     Point**

**Upper****Keweenaw**

** **

** **

** **

**Pickford**

**Cheboygan**

** **

**Sturgeon Bay**

** **

**Detroit**

** **

**Saginaw****Bay**

** **

**Milwaukee**

** **

**Youngstown**

**Tucson**

** **

**Munday**

**  **

**Jackson**

** **

** **

**Myton**

** **

**El Paso**

** **

**Gooding**

** **

**Dandridge**

** **

**Cincinnati**

** **

**Monterey**

** **

**Langtry**

**  **

**Rawlins**

** **

**Kanab**

** **

**Hagerstown**

** **

**Martinsville**

**Middlebury**

** **

** **

** ****Jack Creek**

**Odessa**

**    **

**Greensboro**

** **

**Omaha**

**Brainerd**

** **

**Hannibal L&D**

** **

** **

**Louisville**

** **

** **

** **

** **

**Acushnet**

**Elmira**

** **

** **

** **

** ****Kensington **

** ****Fayetteville**

**New Bern**

**Annapolis**

** ****Canton **

**Iowa City**

**Pacific Junction**

** **

** **

** **

**Ledyard**

** ****Seneca**

**Lincoln**

** **

** **

** ****Wenatchee**

**Whitney**

**Clark**

**Chico**

**Penobscot**

**Charleston**

**Savannah**

** **

** **

** **

** **

** **

** **

**Hartsville**

** **

**Reedy Point**

** **

** **

**Driver**

**Patten**

** **

** **

**Isabela**

** **

- Nationwide Differential Global Positioning System (NDGPS)

## Nationwide DGPS 

**  ****New Site**
**  ****Coast Guard Site**
**    ****Green - Operating **
**    ****Red - Planned**

** **

** **

** **

**Kokole Point**

**Pahoa**

**Upolu Point**

- Hawaii

- Nationwide Differential Global Positioning System (NDGPS)

## Reuse Air Force Ground Wave Emergency Network (GWEN) Equipment and Sites to augment installation of NDGPS
Integrate NDGPS into:
Coast Guard’s DGPS for operational control
National Geodetic Survey’s Continuously Operated Reference Stations (CORS) service for surveying applications
National Oceanic and Atmospheric Administration’s Precipitable Water Vapor System for weather modeling
Ensure that the service is provided free of any user fees
Continually upgrade the system
Sponsor new applications

**Reuse Air Force Ground Wave Emergency Network (GWEN) Equipment and Sites to augment installation of NDGPS**
**Integrate NDGPS into:**
**Coast Guard’s DGPS for operational control**
**National Geodetic Survey’s Continuously Operated Reference Stations (CORS) service for surveying applications**
**National Oceanic and Atmospheric Administration’s ****Precipitable Water Vapor System for weather modeling**
**Ensure that the service is provided free ****of any user fees**
**Continually upgrade the system**
**Sponsor new applications**

*Public *
*Law*

***Bill Clinton***

**Public Law 105-66*****Section 346******October 27, 1997***

- Nationwide Differential Global Positioning System (NDGPS)

**Notes:**
DOT will:
(1) Serve as the lead agency within the U.S. Government for all Federal civil GPS matters.

(2)  Develop and implement U.S. Government augmentations to the basic GPS for transportation applications.

(3)  In cooperation with the Departments of Commerce, Defense and State, take the lead in promoting commercial applications of GPS technologies and the acceptance of GPS and U.S. Government augmentations as standards in domestic and international transportation systems. 

(4)  In cooperation with other departments and agencies, coordinate U.S. Government-provided GPS civil augmentation systems to minimize cost and duplication of effort.