The following are the differences between GPS (Global Positioning System) and DGPS (Differential Global Positioning System).
S.No. |
GPS (Global Positioning System)
|
DGPS (Differential Global Positioning System) |
1. |
GPS is the acronym for Global Positioning System. |
DGPS is the acronym for Differential Global Positioning System. |
2. |
GPS receives data from only one cluster of satellites. |
DGPS receives data from two or more clusters of satellites.
|
3. |
GPS is less expensive than the DGPS. |
DGPS is pricier than the GPS.
|
4. |
The systems that are embedded with the GPS have a global range. |
The systems embedded with DGPS have a localized range. |
5. |
GPS has a single receiver called the Reference Receiver. |
DGPS has two receivers, namely Reference Receiver and the Rover Receiver. |
Surveying Equipment with DGPS or a Differential Global Positioning System
DGPS or the Differential Global Positioning System is the latest technology used in land surveying equipment. It is the enhanced version of GPS or Global Positioning System. The surveying equipment with the DGPS enhances the accuracy of any measurement even if it is by a few centimetres.
Advantages of DGPS or a Differential Global Positioning System
There are many advantages to choosing a DGPS as against choosing equipment like a Total Station, etc. Some of them are:
- DGPS or a Differential Global Positioning System can be used in any environment. DGPS can be used in harsh and rough terrains like hilly areas or wet places like marshlands and rainy areas.
- DGPS or a Differential Global Positioning System provides precisely accurate readings. Even millimetres are corrected.
- DGPS or a Differential Global Positioning System is a lot quicker than many other survey equipment like the Total Stations, etc.
Types of DGPS or a Differential Global Positioning System
There are two main types of DGPS or a Differential Global Positioning System in land surveying. These types are defined based on the are surveyed. If the area surveyed is large, then the DGPS is called Wide Area Augmented System or WAAS. If the area surveyed is localized and smaller in size, then it is referred to as Local Area Augmented System or LAAS.
The commonly used type of DGPS in surveying equipment for land surveying and construction in India is the Local Area Augmented System or the LAAS.
Brands That Manufacture DGPS Or A Differential Global Positioning System
There are many international brands that design and manufacture surveying equipment with DGPS or a Differential Global Positioning System. The popular brands are,
• Leica
• Bosch
• Sokkia
• CHCNAV
Uses of DGPS or a Differential Global Positioning System
A DGPS or a Differential Global Positioning System surveying instrument is used in the following fields.
• Construction (Buildings, factories, warehouses, residences, malls, etc.)
• Infrastructure Development (laying of roads, laying of railway lines, airport runway construction, dams, bridges, etc.)
• Mining
• Land Surveying
• Geological Surveying
• Archaeological Surveying
DGPS or a Differential Global Positioning System Models
The popular Models of DGPS or a Differential Global Positioning System Surveying Instruments in India in 2021 are,
• DGPS HI TARGET V-30 by CHCNAV
• DGPS – Leica ICG70T Differential GPS by Leica
• Leica DGPS GS-18T by Leica
• CHC NAV i50 DGPS by CHCNAV
Pointers for choosing the right DGPS
There are a few things to keep in mind before choosing DGPS equipment. They are:
o Warranty
o After Sales Service
o Price
o Reviews from users
o Ease of use
o Accuracy
o Portability
o Simple assembly
o Reliability
o Long Life
o Low Maintenance