Pengenalan Global Positioning System (GPS) / Sistem Pemosisi Global | #gps #perpetaan #sig

Sadidan Ikhwanussafa

19 Aug 202212:03

Summary

TLDRThis educational video delves into the Global Positioning System (GPS), explaining its function as a system for determining locations on Earth using satellite signals. It covers the history of GPS, starting as a military project by the U.S. Department of Defense and evolving into a global utility. The video discusses the three segments of GPS: control, satellite, and user segments, and the role of each. It also touches on various satellite types, the significance of satellite navigation, and the impact of signal obstructions. The script concludes with an overview of GPS applications, from military to civilian uses, and the benefits and drawbacks of different GPS satellite systems launched by various countries.

Takeaways

🌐 The Global Positioning System (GPS) is a system used to determine locations on Earth's surface with the help of satellite signals.
📡 GPS stands for Global Positioning System, but in the video, the term GPS is used as a shorthand for the system.
🌌 A satellite is an object that orbits a planet, with natural satellites like the Moon and artificial satellites launched by various countries for different purposes.
🛰️ GPS specifically uses navigation satellites that transmit radio signals to receivers on Earth to determine location and direction.
🔄 The GPS system consists of three segments: the control segment that oversees the satellites, the space segment which are the satellites themselves, and the user segment that receives signals from the satellites.
🌍 Multiple countries have launched their own navigation satellites, each with unique characteristics and features, contributing to the global GPS network.
🚀 GPS was initially developed for military use by the United States Department of Defense, but later made available for civilian use to enhance various applications.
📱 There are various types of GPS devices, from those used in vehicles and marine to sports GPS devices like smartwatches, handheld GPS for aviation, and smartphones.
🧭 GPS accuracy can vary, with an approximate accuracy of 4.9 meters under open sky conditions, but can be affected by obstacles like buildings or dense forests.
⏲️ GPS signals can be disrupted by satellite orbital errors, geometry issues, insufficient tracked satellites, and selective availability which can be influenced by administrative restrictions.

Q & A

What is GPS and what does it stand for?
-GPS stands for Global Positioning System. It is a system used to determine locations on the Earth's surface with the help of satellite signals.
What is the Indonesian term for GPS?
-In Indonesian, GPS is referred to as 'Sistem Pemosisi Global'.
What are satellites and what are the different types mentioned in the script?
-Satellites are objects that orbit around a planet. In the script, it mentions natural satellites like the moon and artificial satellites such as those for astronomy, Earth observation, communication, and weather.
What is the role of satellites in the Global Positioning System?
-In GPS, satellites are used for navigation, sending radio signals to receivers on the Earth's surface to determine location or position.
What are the three segments of the GPS system mentioned in the script?
-The three segments of the GPS system are the control segment, the satellite segment, and the user segment.
How many satellites are needed for a GPS receiver to determine a position?
-A minimum of three satellites are needed for a GPS receiver to determine a position.
What is the historical background of GPS mentioned in the script?
-GPS was initially developed by the U.S. Department of Defense for military use and was first launched in 1978. It was later made available for civilian use by President Ronald Reagan in 1983.
What are some of the benefits and applications of GPS mentioned in the script?
-GPS has been used for military purposes, disaster prevention, monitoring Earth's conditions, and as a tool for geographic information systems, tracking, and disaster detection.
What are the different types of GPS devices mentioned in the script?
-The script mentions GPS devices used in vehicles, marine GPS, sports GPS like smartwatches, handheld GPS, aircraft GPS, and geodetic GPS.
What factors can affect the accuracy of GPS signals?
-Factors affecting GPS signal accuracy include buildings, dense forests, orbital errors, satellite geometry, insufficient tracked satellites, and selective availability.
What are the two tasks given at the end of the script?
-The two tasks are to create a presentation about the benefits and uses of GPS in environmental technology and to write about the advantages and disadvantages of the navigation satellites launched by various countries.

Outlines

00:00

🌐 Introduction to GPS and Satellite Navigation

This paragraph introduces the Global Positioning System (GPS), explaining it as a system used to determine locations on Earth's surface with the help of satellite signals. It distinguishes between natural satellites like the moon and artificial satellites, which are devices launched by experts to orbit the Earth for various purposes. The paragraph also discusses the different types of artificial satellites, including those for astronomy, Earth observation, communication, and weather. It emphasizes the role of navigation satellites in GPS, which use radio signals to determine position and direction for vehicles, aircraft, ships, and airlines. The Global Positioning System is comprised of three segments: the control segment, the space segment, and the user segment, all of which coordinate with each other. The paragraph concludes by mentioning that there are multiple GPS systems launched by different countries, each with its own characteristics.

05:02

🚀 History and Applications of GPS

Paragraph two delves into the history of GPS, highlighting its initial development by the U.S. Department of Defense for military purposes and its launch in 1978. It notes a shift in 1983 when President Ronald Reagan proposed making GPS available for civilian use, recognizing its potential beyond military applications. The paragraph outlines the evolution of GPS from a military tool to a multi-purpose technology used in navigation, disaster prevention, and environmental monitoring. It also discusses the variety of GPS devices, from those used in vehicles and marine to sports and geodetic applications, each with different levels of accuracy. The paragraph addresses the accuracy of GPS, which can reach about 4.9 meters in open-sky conditions, and mentions factors that can impede GPS signals, such as buildings, dense forests, and satellite-related issues like orbital errors and selective availability.

10:02

📝 Assignments and Conclusion

The final paragraph of the script assigns two tasks to the viewers. The first is to create a presentation about the benefits and uses of GPS in environmental technology. The second is to write about the advantages and disadvantages of the navigation satellites launched by various countries, as mentioned in the previous slides. The paragraph concludes with an apology for any shortcomings in the video and expresses hope that the information shared is beneficial. It ends with a farewell, indicating the end of the video.

Mindmap

Keywords

💡Global Positioning System (GPS)

GPS is a satellite-based navigation system that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. In the video, GPS is the central theme, discussed as a system initially designed for military use but has since been made available for civilian use, with applications ranging from vehicle navigation to disaster prevention.

💡Satellite

A satellite is a celestial body that orbits a planet or another object in space. In the context of the video, satellites are人造 objects launched into orbit for various purposes, such as communication, weather monitoring, and navigation. The GPS system specifically uses navigation satellites that transmit signals to receivers on Earth to calculate positions.

💡Satelit Navigasi

Satelit Navigasi, or navigation satellite, is a type of satellite specifically designed for determining position and providing navigation. The video explains that these satellites are used by GPS to transmit radio signals to receivers on the Earth's surface to determine location.

💡Segment

In the context of GPS, a segment refers to the different components that make up the system. The video mentions three segments: the control segment that oversees the satellites, the space segment which are the satellites themselves, and the user segment which includes the receivers on Earth. Each segment plays a crucial role in the overall functioning of the GPS system.

💡Signal

A signal in the video refers to the radio waves transmitted by GPS satellites to receivers on Earth. These signals are essential for GPS functionality as they allow the receivers to calculate their position by triangulating the signals from at least three satellites.

💡Accuracy

Accuracy in the video pertains to the precision of the GPS system in determining location. The script mentions that GPS accuracy can be affected by various factors such as obstructions and satellite geometry, with an approximate accuracy of 4.9 meters under clear sky conditions.

💡Orbital Error

Orbital Error refers to the inaccuracies in the predicted positions of satellites. The video explains that these errors can affect GPS signal accuracy and are corrected by ground stations to ensure the GPS system functions correctly.

💡Selective Availability

Selective Availability was a U.S. government policy that deliberately degraded the accuracy of GPS signals received by non-military users. The video mentions that this policy could hinder GPS signal reception depending on the country's regulations and availability of satellites.

💡GLONASS

GLONASS stands for Globalnaya Navigatsionnaya Sputnikovaya Sistema, which is the Russian satellite navigation system. The video discusses GLONASS as a counterpart to GPS, launched by the Soviet Union in 1982, to provide similar positioning services.

💡Geodetik

Geodetik, or geodesy, is the scientific discipline that deals with the measurement and representation of the Earth, including its gravitational field, in a three-dimensional time-varying space. The video mentions GPS geodetik as a highly accurate GPS system used by experts for precise mapping.

💡Civillian Use

Civillian Use in the video refers to the application of GPS technology for non-military purposes by the general public. The script explains the shift from military-only use to widespread civilian applications, such as navigation for vehicles, maritime, and air travel.

Highlights

Introduction to Global Positioning System (GPS) and its Indonesian term, Global Positioning System.

Definition of GPS as a system for determining locations on Earth using satellite signals.

Explanation of satellites as objects orbiting a planet, with natural and artificial satellites.

Different types of satellites including astronomy, Earth observation, communication, and weather satellites.

GPS specifically uses navigation satellites that transmit radio signals to receivers on Earth.

The three segments of GPS: control segment, space segment, and user segment.

The control segment's role in monitoring and maintaining the proper functioning of GPS satellites.

User segment's ability to receive signals from GPS satellites for location determination.

Variety of navigation satellites launched by different countries, each with unique characteristics.

Historical overview of GPS, initially a military project by the US Department of Defense.

President Ronald Reagan's decision to make GPS available for civilian use in 1983.

Diverse applications of GPS beyond military use, such as disaster prevention and environmental monitoring.

Types of GPS devices, from vehicle-mounted systems to sports wearables and geodetic equipment.

Accuracy levels of different GPS devices, with geodetic GPS offering the highest precision.

Factors affecting GPS accuracy, including environmental obstacles and satellite-related issues.

Selective availability as an administrative factor that can limit GPS signal availability.

Assignments given to viewers to create presentations on the benefits of GPS in environmental engineering and to list the advantages and disadvantages of various countries' navigation satellites.

Closing remarks and apology for any shortcomings in the video content, with a hope for the information provided to be beneficial.