From Wartime to Everyday Necessity – The History of GPS Technology
GPS technology has a long history and has evolved significantly over time. This section highlights the deep-rooted history of GPS technology (describing where it all began).
Overview
So. Let’s start – we have divided different timelines for your better understanding.
Early Concepts and Foundations (1950s – 1960s)
The concept of satellite-based navigation was proposed during the early years of the Space Age.
The launch of Sputnik 1 by the Soviet Union in 1957 was a pivotal moment. Scientists at the Johns Hopkins Applied Physics Laboratory realized that they could track Sputnik’s orbit by measuring the Doppler shift of its radio signals. This realization led to the idea of using satellites for navigation.
Launch and Deployment (1973)
The GPS project, initially named NAVSTAR GPS, was officially launched by the U.S. Department of Defense. The system was designed to overcome the limitations of previous navigation systems by providing continuous global coverage and higher accuracy.
The system used a constellation of 24 satellites orbiting the Earth, ensuring that at least four satellites would be visible from any point on the Earth’s surface at any time.
Full Operational Capability (1993)
The GPS achieved Initial Operational Capability (IOC) with 24 satellites in orbit, providing continuous worldwide coverage.
By 1995, GPS was declared to have Full Operational Capability (FOC), which means, it was fully functional and available for civilian and military use. GPS in Fleet Management (1990)
As GPS technology became widely available, fleet management systems started incorporating GPS for real-time vehicle tracking and route planning.
Businesses have started using GPS to monitor the location, speed, and efficiency of their vehicles, leading to improved logistics and reduced operational costs.
Modern Applications and Integration (2010 to Present)
The integration of GPS with other technologies, such as telematics, IoT (Internet of Things), and big data analytics & even AI has revolutionized fleet management.
Modern fleet management systems offer comprehensive solutions, including route planning, driver behavior monitoring, fuel management, and maintenance scheduling.
Real-time data from GPS devices is used to enhance efficiency, improve safety, reduce fuel consumption, and ensure regulatory compliance.
GPS systems utilize satellites to determine the exact location of a vehicle, asset, or any other valuable consignment by calculating distances using radio signals.
Like many other GNSS constellations, GPS functions on three main segments: the space segment, the control segment, and the user segment. This method is also known as Triangulation or the GPS working principle.
Let’s dig into this in detail-
Satellites in Orbit
The GPS consists of a constellation of at least 24 satellites orbiting the Earth at an altitude of about 20,200 kilometers (12,550 miles).
These satellites are arranged so that at least four of them are visible from any point on the Earth’s surface at any given time.
Satellite Signals
Each GPS satellite continuously transmits a signal that includes the satellite’s location and the exact time the signal was sent.
The signals travel at the speed of light and include precise time-stamped information.
GPS Receiver
A GPS receiver or tracker, such as those found in smartphones, cars, or GPS devices, receives the signals from multiple satellites.
The receiver uses the time stamps in the signals to calculate the time it takes for each signal to travel from the satellite to the receiver.
Triangulation aka GPS Working Principle
By knowing the travel time of the signals and the speed of light, the GPS receiver can calculate the distance to each satellite.
Using the distances from at least four satellites, the receiver can determine its exact position (latitude, longitude, and altitude) through a process called trilateration.
If only three satellites are available, the receiver can still determine its position but not the altitude.
Display of Location
Once the GPS receiver calculates its position, it can display the location on a map, provide directions, or share the coordinates with other systems or applications.
