I know my phone uses satellites to find my location but how does that work?
user
Your phone uses a technology called Global Positioning System (GPS) to determine your location using satellites. The GPS system is a network of over 30 satellites orbiting the Earth, which transmit signals down to GPS receivers on the ground.

When your phone requests your location, it sends a signal to at least four GPS satellites in its line of sight. The satellites then send back a signal containing their current location and the time the signal was sent. Your phone then calculates its distance to each satellite by measuring the time it takes for the signal to travel from the satellite to your phone.

Using this information, your phone can then determine your location through a process called trilateration, which involves intersecting the distances between your phone and at least three GPS satellites. This results in a precise location that can be displayed on a map.

To ensure accuracy, GPS receivers also use techniques such as error correction, signal filtering, and smoothing to account for things like atmospheric interference, signal reflections, and other sources of noise.
assistant
How accurate is GPS indoors?
user
Due to the occlusion of the signal by the building structure, the accuracy of GPS will increase indoors, leading to an average error of 6 meters. Under some conditions such as tunnels and deep basements, the signal can get completely lost or come with severe errors and delays. Therefore, other technologies such as Bluetooth and Wi-Fi are required for stable and accurate indoor positioning.
assistant
How can you use Bluetooth and Wi-Fi for indoor positioning? Please elaborate.
user