Know Inside Position — Repeat GPS Signals

Solution

This seems a very interesting approach.

Currently they are simply repeating the signal that the antenna outside receives to the transmitter inside. So this concept cannot be used as-is to provide navigation inside buildings.

If we simply start receiving GPS signals inside then the whole array of solutions already available for dones would simply start working inside!

Some companies that have this solution are:

• Roger https://www.gps-repeating.com
• Faltech GPS https://www.gps-repeaters.com/solutions/
• Nextwav http://www.nextnav.com

Some general blogs:

• http://specialistantennas.blogspot.com/2013/04/how-to-move-gps-signals-inside-and-why.html
• http://www.carighttoknow.com/understanding-the-indoor-gps-repeater-technology/
• https://www.scientificamerican.com/article/indoor-positioning-system/
• https://learn.sparkfun.com/tutorials/gps-basics/all This explains how the GPS signals are received and also AGPS
• A research paper on the subject. https://www.researchgate.net/publication/224396818_Indoor_Positioning_Based_on_GPS-Repeaters_Performance_Enhancement_using_an_Open_Code_Loop_Architecture
• See section 5.13 https://books.google.com/books?id=-sPXPuOW7ggC&pg=PA237&lpg=PA237&dq=relay+gps+signal+inside&source=bl&ots=2t4vAtQIlD&sig=ACfU3U3Cu5hs19oepipgOf2u96meck2eTg&hl=en&sa=X&ved=2ahUKEwjnkdKfwv3gAhXEm-AKHbfVBSc4ChDoATAJegQIDhAB#v=onepage&q=relay%20gps%20signal%20inside&f=false
• A patent application on the subject. https://patents.google.com/patent/US7068973

See Also