Ever wonder how a GPS works? This 4 minute Google Video is an excerpt from the NASA SCI Files™ “The Case of the Technical Knockout” video.
This segment explains how GPS receivers work with GPS satellites to determine an exact location. The concept of trilateration in two and three dimensions at a 3rd-5th Grade level, which is great since that means I can understand most of it!
If you want to watch the full “The Case of the Technical Knockout”, click on each of the pictures to watch the four 15-minute segments.
First Segment
Armed with Global Positioning System (GPS) receivers, compasses, maps, and travel bugs, the tree house detectives set off to do some “geocaching” in the national parks of Virginia. Unexpectedly, while trying to find their first cache, their GPS receivers begin to give multiple coordinates, and the detectives believe they might be lost. When they try to radio home base, they find that their two-way radios are also on the blink. Then, as quickly as the strange phenomenon began, it ends, and the detectives are back on track. They are concerned, however, that if the GPS and radio malfunctions occur again, they might not be so lucky. The detectives decide that they must solve this mystery and discover what caused the radio and GPS malfunctions. Their first stop is NASA Langley Research Center to speak with Charles Cope, a pilot for NASA, to learn more about how a GPS is used for navigation. Next stop is a videoconference with Dr. D, who just happens to be in Oslo, Norway at the Viking Ship Museum. Dr. D tells the detectives how explorers have navigated around the world for thousands of years by using the stars, lodestones, and Iceland spar. Finally, they decide to prepare for their next expedition and head to the store to find a container for their cache.
Second Segment
Still concerned that their Global Positioning System (GPS) receivers and radios might go on the blink again, Tony and Catherine go to NASA Langley Research Center to talk to Mr. George Ganoe to learn more about the GPS and how it works. After speaking with Mr. Ganoe, the detectives decide that it probably wasn’t the GPS satellite system that caused the communications problem, but they begin to think that it might have something to do with radio waves. They decide to email two of the NASA SCI Files™ Kids’ Club members in Norway, Ole and Nina, to talk with Dr. D. He meets Ole and Nina at the ALOMAR Observatory in Andenes, Norway where he explains the electromagnetic spectrum. Meanwhile, back in the U.S., Tony heads to Colorado and takes time to stop by the University of Colorado to visit Dr. Fran Bagenal to learn about electricity.
Third Segment
Still undecided about what might have caused the GPS and radio glitches, the detectives contact Ole and Nina to meet Dr. D to learn about magnetism. Dr. D meets them at the Northern Lights Museum in Andenes, Norway, where he performs several demonstrations and discusses how the Earth’s magnetic field interacts with light particles coming from the Sun. To learn more about electromagnets, the tree house detectives dial up Mr. Jacobsen’s class at Andenes Ungdomskole (middle school). Last stop for the detectives is NASA Goddard Space Flight Center in Greenbelt, Maryland, where RJ and Catherine talk with Dr. Nicky Fox to learn more about our star, the Sun.
Fourth Segment
Trying to put the final pieces of the puzzle together, the tree house detectives dial up
Dr. Sten Odenwald to learn about solar flares and coronal mass ejections and their effect on Earth. To confirm their hypothesis, the detectives send Tony to visit Joe Kunches at the National Oceanic and Atmospheric Administration (NOAA) in Boulder, Colorado, to learn more about space weather. At last the detectives think they know why their GPS receivers and radios went on the blink and had a few glitches. To wrap up the problem, they head to the airport to meet Dr. D as he returns from Norway.
Educators Guide
There is even an comprehensive, 70 page, Educator’s Guide that provides overviews, lesson plans, student worksheets, glossaries, materials lists, objectives, standards, and resources.