Regarding RTK technique, if you have appropriate equipment for full RTK you will have up to cm accuracy. I wondered if we can use very simple external to device antenna (I'm not speaking about Garmin GPS device style build in antennas like we all had in past mobile phones) communicating with the smartphone via wifi/bluetooth/rfid + software layer running on the smartphone, to somehow take advantage on RTK technique in order to improve current GPS accuracy which is ~3 meters to let's say even something like ~1 meter?
Will we compromise accuracy by using very primitive external hardware - So is a simple antenna relevant for RTK?
Speaking about this article
So they said "one base station and one on a vehicle, connected via radio link" but not explaining + $900 is too much. The question is very simple: Can we have the equivalent to "base station" as the smartphone, and equivalent to "one on a vehicle" as simple piece of metal-e.g. antena, all together costs nothing comparing to smartphone price, in order to get 1 meter accuracy compromising the 1 cm accuracy because still we modified here cheaper constellation?