4 ms·
More interesting than this is https://en.m.wikipedia.org/wiki/Real_Time_Kinematic https://en.m.wikipedia.org/wiki/Real_Time_Kinematic , which uses no extra tran
by wyager 11y ago
More interesting than this is https://en.m.wikipedia.org/wiki/Real_Time_Kinematic https://en.m.wikipedia.org/wiki/Real_Time_Kinematic , which uses no extra transmit hardware compared to normal GPS, but can provide mm accuracy. (In practice, it often requires multiple cooperating receivers, but current research is finding ways to make this work practically in single-receiver handheld devices like phones.)
This technique has gotten thousands of times cheaper in recent years (now around $150 for a receiver, according to a talk I recently attended) and should soon be cheap enough for consumer electronics.
This works anywhere and doesn't require supplementary external hardware like Wi-Fi.
- Animats 11y agoNo, it doesn't work anywhere. It only works where you have line of sight to at least 4 satellites, preferably 5. Indoor positions and positions in urban canyons will not be anywhere near that good.
- mr337 11y agoThere is an external component to this that provides the corrections. Did you read https://en.m.wikipedia.org/wiki/Real_Time_Kinematic#Practical_considerations https://en.m.wikipedia.org/wiki/Real_Time_Kinematic#Practica.... It explains the corrections sent either via CORS or VRS.