Have you ever used GPS while running or cycling? Usually, to get millimeter-level precision, your smartphone needs to 'talk' to satellites in space for a long time. This process is called PPP and can be a bit slow, like waiting for a video to buffer on a slow connection. But what if we had 'terrestrial satellites' ready to help us?
This is where 'pseudolites' come in. Imagine them as small repeaters placed near us on Earth, mimicking signals from space satellites. Because they are so close, the signal changes rapidly as we move, allowing the system to figure out exactly where you are in very little time.
A new study has found a way to make these two worlds work together super efficiently. Scientists designed a system that resolves small calculation errors (called 'ambiguities') one after another, like levels in a video game. First, it resolves the pseudolite ambiguities, then the space satellite ones. The result? Incredible precision almost instantly. This is a huge step forward for self-driving cars and drones, which will need to know their exact location with absolute precision and without endless waiting!
