GPS vs. DGPS — What's the Difference?
Edited by Tayyaba Rehman — By Fiza Rafique — Published on January 4, 2024
GPS provides location and time information globally using satellites; DGPS is an enhancement that reduces errors, using ground-based reference stations.
Difference Between GPS and DGPS
Table of Contents
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Key Differences
GPS (Global Positioning System) is a satellite-based navigation system that provides location and time information under all weather conditions, anywhere on or near the Earth. It works by having a constellation of more than two dozen GPS satellites in precise orbits transmitting signals to receivers on the ground, allowing them to calculate their exact location (latitude, longitude, and altitude) and time.
DGPS (Differential GPS) is an enhancement to the GPS system that uses a network of fixed, ground-based reference stations to broadcast the difference between the positions indicated by the satellite systems and the known fixed positions. These stations are strategically placed around the world to increase the accuracy of GPS data by correcting for GPS signal errors caused by atmospheric disturbances, timing, and satellite orbit errors.
While GPS can provide accuracy up to 15 meters in good conditions, DGPS can often improve this accuracy to within 1 to 3 meters by correcting signal errors. DGPS works by having the reference station calculate the difference between its known fixed position and the position given by the GPS data; it then broadcasts this correction to DGPS-equipped receivers.
The increased accuracy of DGPS makes it particularly useful for applications requiring precise navigation such as aviation, surveying, and maritime operations, where small errors can be critical. Despite the increased accuracy of DGPS, both systems rely on the basic GPS technology and satellite signals to function.
GPS is universally accessible and does not require the user to transmit any data, and it is inherently less accurate than DGPS, which requires additional infrastructure and equipment. DGPS technology is an overlay system that improves the accuracy of the data received from GPS satellites, showing the symbiotic relationship between the two systems.
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Comparison Chart
Primary Function
Provides location information.
Enhances GPS accuracy.
Accuracy
Accurate up to 15 meters.
Accurate within 1-3 meters.
Components
Satellites and receivers.
Satellites, receivers, and ground stations.
Dependency
Independent system.
Depends on GPS signals.
Usage
General navigation.
Precision navigation.
Availability
Global.
Near reference stations.
Cost
Free for basic use.
Additional cost for setup and maintenance.
Signal Errors
Subject to various errors.
Corrects signal errors.
Compare with Definitions
GPS
Technology enabling users to pinpoint their geographic location.
Hikers commonly use GPS to avoid getting lost in the wilderness.
DGPS
A technique to refine positional data using fixed reference points.
By using DGPS, the archaeologists were able to map the site accurately.
GPS
Satellite-based navigation that provides time and location information.
Our car's GPS system guided us through the unfamiliar city.
DGPS
An enhanced GPS using additional ground stations for better precision.
The harbor uses DGPS to ensure ships navigate safely.
GPS
A global system that uses satellites for navigation and mapping.
The delivery driver relied on GPS to make deliveries on time.
DGPS
A navigation system that reduces GPS errors for critical applications.
DGPS is essential for the accuracy needed in aerial crop dusting.
GPS
A tool for tracking and mapping movements in real-time.
The company tracks its fleet of trucks using GPS.
DGPS
GPS with corrections to provide higher location accuracy.
Our autopilot system uses DGPS for improved reliability.
GPS
A system for determining position by comparing radio signals from several satellites.
I used my phone's GPS to find the restaurant.
DGPS
A system that improves GPS accuracy through ground-based corrections.
We installed a DGPS system for precise land surveying.
GPS
A navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time difference for signals from different satellites to reach the receiver
Common Curiosities
How does DGPS increase accuracy?
DGPS corrects GPS signals by using ground reference stations to eliminate common errors.
What does GPS stand for?
GPS stands for Global Positioning System.
Is GPS free to use?
Yes, GPS is freely accessible to the public.
How does GPS work?
GPS works by receiving signals from satellites to determine one's location on Earth.
What does DGPS stand for?
DGPS stands for Differential Global Positioning System.
What is the typical accuracy of GPS?
GPS typically provides accuracy up to 15 meters.
Do I need special equipment for DGPS?
Yes, you need a DGPS receiver and access to correction signals.
Can weather affect GPS or DGPS signals?
Yes, severe weather can affect the accuracy of both GPS and DGPS signals.
Are DGPS corrections available everywhere?
No, DGPS corrections are only available in areas covered by reference stations.
Can DGPS work without GPS?
No, DGPS is an enhancement and relies on GPS signals to function.
What is the typical accuracy of DGPS?
DGPS can provide accuracy within 1 to 3 meters.
Is DGPS used in aviation?
Yes, DGPS is used in aviation for precise navigation and landing.
Why is DGPS more accurate than standard GPS?
DGPS provides additional corrections that standard GPS does not.
Do smartphones use DGPS?
Most smartphones do not use DGPS as they rely on standard GPS.
What are common applications of DGPS?
Common applications include surveying, mapping, agriculture, and maritime navigation.
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Written by
Fiza RafiqueFiza Rafique is a skilled content writer at AskDifference.com, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.
Edited by
Tayyaba RehmanTayyaba Rehman is a distinguished writer, currently serving as a primary contributor to askdifference.com. As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.
