Is it possible to find a precise location inside a building or a room where GPS will not work? Explain.

Question

What will be an ideal response?

Answer 1

While sometimes we can get a position inside a building when close to a window, the GPS antenna normally will not receive sufficient signal strength from the satellites to acquire from inside a building. It does not take much at all to obscure the high frequency and relatively low power GPS transmissions and a tin roof is more than enough to block the signals. Atmospheric conditions and satellite positions also affect reception, therefore we may find that sometimes we can get a position with an antenna mounted inside or another poor location, but at other times of day we do not. One way of achieving this indirectly is to use an
external GPS observable object as a reference and use the relative distance between the reference and the object inside the room (This has to be done by other wireless techniques).