what is GPS

The GPS stand for Global Positioning System, it is a satellite-based navigation system owned by the United States government and operated by the United States Space Force.


It’s formed from a constellation of 24 satellites. GPS works in any weather conditions, anywhere in the world, 24 hours a day. In 1973 the U.S.


GPS

It’s originally put the satellites into orbit for military use, but they were made available for civilian use in the 1980s.


GPS

How it’s Work

The Global Positioning System is one of the Global Navigation Satellite Systems (GNSS) that provides Geolocation and Time information to a GPS receiver anywhere on or near the Earth.


GPS for GIS

GIS and GPS activity, you will collect and use local data from ground observations and satellites as well as create and use your own set of GPS waypoints.


Principles of GPS

The GPS System Consists of 24 Satellite
A GPS receiver processes signal from at least 4 Satellites
GPS system and receiver is the constancy of the speed of light



Characteristics of GPS

Accurate Navigation 10 – 20 m
Worldwide Coverage
20,200 Km above the Earth
24 hour access

Segments of GPS

GPS consists of 3 major segments:

Space segment
Control segment
User segment

GPS Rreceiver

GPS receivers have a similar core operation:

collect the data broadcast by the satellites,
measure the signals
compute position, velocity, and time


Applications of GPS

Determine your 3-D position
Receivers on earth receive this signal
Tracking
Mapping
Speed and Time, calculate Distance
Navigation or positioning.


Advantages of GPS

Weather Independent
Gives high Geodetic Accuracy
Common Coordinate System
Economical advantages


Disadvantages of GPS

Inaccuracy
Driving Distraction
Signal or Battery Failure
Lack of Knowledge