1.8 - Navigation Signals
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- Опубліковано 21 гру 2016
- Standford University - 13 October 2014
Today, the Global Positioning System (GPS) is deployed in over three billion devices across the world. This course will teach you the fundamentals of how GPS works and introduce you to the diverse range of uses of satellite navigation-in all aspects of our lives.
Through vivid online lectures and a set of "backyard experiments" enabled by the widespread availability of GPS-enabled smart phones and tablets, students will be able to connect online learning to real-world experience. Even those who do not own laptop or desktop computers can take part; they will be able to view lectures and completing labs via mobile device only.
We hope students will enjoy the interactive nature of the course, while gaining knowledge that benefits their personal and professional lives. Please visit www.gps-lab.org for up-to-date details!
Syllabus
Part I. Fundamentals of GPS Introduction
Introduction
· How GPS works and what it does for us (Enge)
· Course objectives & schedule (Enge, van Diggelen)
· The Joy of GPS (van Diggelen)
Module 1: How GPS Works (Enge)
· How GPS works
· Navigation in Our Lives: The Exxon Valdez
Module 2: Pseudoranges (Enge)
· Linearization & error analysis
· Accuracy & dilution of precision (DOP)
· Differential GPS
· Navigation in Our Lives: Landing Airplanes Using GPS
· Experiment A: Accuracy
Module 3: Orbits and Signals (Enge)
· Satellite orbits
· Signals, codes
· Navigation in Our Lives: Maritime & Air Surveillance
· Experiment B: Satellite Visibility
Part II. Modern GPS receivers: cell phones, tablets and more!
Module 4: Receiver Design Basics (van Diggelen)
· Power, Receiver design
· Acquisition
· Navigation in Our Lives: GPS in sports
· Experiment C: GPS Signal Power
Module 5: Assisted GPS (van Diggelen)
· Supplanting the Navigation Message
· Improving Sensitivity
· Navigation in Our Lives: “There’s an app for that”
Module 6: The Future of GPS and Satellite Navigation (van Diggelen)
· GNSS, all Global Navigation Satellite Systems
· GLONASS, QZSS, Beidou, Galileo, IRNSS, and Future GPS (GPS III)
· Navigation in Our Lives: GPS everywhere
One of the most clear explanations I found. Excellent work. Thank you very much!
very simple an clear explanation
Very Good Explanation
4:55 "You'll have a book of codes in your receiver, and it will say 'OH MY GOODNESS'! I'm looking for..."
How does the receiver "split-the-threads" of the C/A and navigation messages if they are sent at the same time? Does it take advantage of the longer bits in the navigation message? That is, when the navigation sends a "one" is that where the C/A ranging occurs?
is it possible to get data of other devices from GPS satellite transmissions?
The GPS data that is sent by satellites only tells you about the satellite constellation. In that regard, it is only a one-way communication with common civilian devices.
21:19
7:00 Damn is that Al Green teaching this lecture???
Awesome presentation. But my favorite satellite system "GLONASS" 😂 I was dying...
How long does it take for a GPS signal to reach the earth?
Option a- 1/10
b- 1/15
c- 1/20
d- 1/25
Please tell me sir
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How does a satellite determine the exact speed of an object on Earth while rotating over a circular path at 14,000 kilometers per hour? Wouldn't it be 1000 times cheaper if they use high-altitude atmospheric balloons or land-based towers? A signal sent by a fridge-sized satellite at 20,200 kilometers away and moving at 14,000 kilometers per hour. I can understand why nobody discusses the ridiculous speeds and altitude of these satellites when calculating radio frequencies; otherwise, it wouldn't make sense.
I guess it is your personal device (navigation/cellphone) that calculates your own speed. GPS just provides a position (it's in the name).
If you are moving in your car, you know your velocity, if you have (at least) 2 positions and the time between aquiring those positions.
..
The satellite has a well known orbit. This gentleman explains very well how you can calculate the position of a satellite.
It would be difficult to know the exact position of a balloon, floating on the wind.
Also, a satellite has a greater range than a balloon. The satellite is 20000 km away, looking down at our planet. A balloon is perhaps at 30+ km altitude (at least a typical waetherballoon pops at just above 30 km altitude). It can not see so much Earth => you would need more balloons than satellites.
Anyone watching this video probably doesn't need to be told what Ghz, Mhz, etc. are.