GPS time | Wikipedia audio article |
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This is an audio version of the Wikipedia Article:
GPS time 00:03:19 1 History 00:05:01 1.1 Predecessors 00:09:43 1.2 Development 00:15:27 1.3 Timeline and modernization 00:20:22 1.4 Awards 00:22:54 2 Basic concept of GPS 00:23:05 2.1 Fundamentals 00:24:19 2.2 More detailed description 00:26:03 2.3 User-satellite geometry 00:27:17 2.4 Receiver in continuous operation 00:28:39 2.5 Non-navigation applications 00:30:00 3 Structure 00:30:35 3.1 Space segment 00:33:18 3.2 Control segment 00:38:18 3.3 User segment 00:40:37 4 Applications 00:41:15 4.1 Civilian 00:45:48 4.1.1 Restrictions on civilian use 00:47:09 4.2 Military 00:49:22 5 Communication 00:49:58 5.1 Message format 00:52:44 5.2 Satellite frequencies 00:57:14 5.3 Demodulation and decoding 00:58:37 6 Navigation equations 00:58:47 6.1 Problem description 01:03:18 6.2 Geometric interpretation 01:03:38 6.2.1 Spheres 01:05:02 6.2.2 Hyperboloids 01:05:53 6.2.3 Inscribed sphere 01:06:34 6.2.4 Spherical cones 01:07:29 6.3 Solution methods 01:07:38 6.3.1 Least squares 01:09:31 6.3.2 Iterative 01:10:03 6.3.3 Closed-form 01:11:26 7 Error sources and analysis 01:12:26 8 Accuracy enhancement and surveying 01:12:36 8.1 Augmentation 01:13:40 8.2 Precise monitoring 01:17:54 8.3 Timekeeping 01:18:02 8.3.1 Leap seconds 01:18:47 8.3.2 Accuracy 01:19:32 8.3.3 Format 01:19:41 8.4 Carrier phase tracking (surveying) 01:20:02 9 Regulatory spectrum issues concerning GPS receivers 01:20:10 10 Other systems 01:21:30 11 See also 01:34:49 12 Notes 01:42:59 13 References 01:43:55 14 Further reading Listening is a more natural way of learning, when compared to reading. Written language only began at around 3200 BC, but spoken language has existed long ago. Learning by listening is a great way to: - increases imagination and understanding - improves your listening skills - improves your own spoken accent - learn while on the move - reduce eye strain Now learn the vast amount of general knowledge available on Wikipedia through audio (audio article). You could even learn subconsciously by playing the audio while you are sleeping! If you are planning to listen a lot, you could try using a bone conduction headphone, or a standard speaker instead of an earphone. You can find other Wikipedia audio articles too at: https://www.youtube.com/channel/UCuKfABj2eGyjH3ntPxp4YeQ You can upload your own Wikipedia articles through: https://github.com/nodef/wikipedia-tts "The only true wisdom is in knowing you know nothing." - Socrates SUMMARY ======= The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force. It is a global navigation satellite 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. Obstacles such as mountains and buildings block the relatively weak GPS signals. The GPS does not require the user to transmit any data, and it operates independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the GPS positioning information. The GPS provides critical positioning capabilities to military, civil, and commercial users around the world. The United States government created the system, maintains it, and makes it freely accessible to anyone with a GPS receiver.The GPS project was launched by the U.S. Department of Defense in 1973 for use by the United States military and became fully operational in 1995. It was allowed for civilian use in the 1980s. Advances in technology and new demands on the existing system have now led to efforts to modernize the GPS and implement the next generation of GPS Block IIIA satellites and Next Generation Operational Control System (OCX). Announcements from Vice President Al Gore and the White House in 1998 initiated these changes. In 2000, the U.S. Congress authorized the modernization effort, GPS III. During the 1990s, GPS quality was degraded by the United States government in a program called "Selective Availability"; this was discontinued in May 2000 by a law signed by President Bill Clinton.The GPS system is provided by the United States government, which can selectively deny access to the system, as happened to the Indian military in 1999 during the Kargil War, or degrade the service at any time. As a result, several countries have developed or are in the process of setting up other global or regional satellite navigation systems. The Russian Global Navigation Satellite System (GLONASS) was developed contemporaneously with GPS, but suffered from incomplete coverage of the globe until the mid-2000s. GLONASS can be added to GPS devices, making more satellites available and enabling positions to be fixed more quickly and accurately, to within two meters. China's BeiDou Navigation Satellite System is due to ach ... |