Recently there has been, along with other stories about privacy invasions into our lives, stories about newer cars communicating much of our data back to the manufacturer. Sure, OnStar has been around for awhile, but supposedly only called 'home' when you pushed the button. Then they began to tell us that if you're in an accident and cannot reach the button, that golly we've installed a voice activated call that allows you to summon help with just your voice. Ain't that neat? Sorry to say that for that to work, everything that is said in the car is parsed and evaluated. Whether or not it is used otherwise, who knew, but now we do.
The article in the NY Times went on to say lots of stuff about our vehicles is transmitted back to some monitoring station. Useful stuff like I've been in an accident, time to change the oil, and so on. More nefarious are that at 3:22 pm I was doing 104 mph on the interstate, or some such violations. And the radio stations we are listening too and other stuff that had nothing to do with the warranty on the car and so on.
My question is how does this get back to the manufacturer? Satellite seems to be a possible path. We've all seen these river and weather monitors with what looks like high gain Yagi antennas pointing at a geostationary satellite, and companies like Campbell Scientific make equipment to allow the weather service and researchers gather data from out in the boonies and send that back. That method alone intrigues me such as how many of these can a satellite handle, what is the data rate and all that, but that is for another discussion.
If there are say 30,000 newer cars from a manufacturer trying to dump these data back to their motherhouse for analysis, how do they avoid stepping on each other's transmissions, and how much bandwidth does this eat up? Where is the antenna in the car, just like the patch antennas for GPS and so on? How much power does the car transmitter put out?
Is this whole system the reason that the advertisements for the last couple years brag about having WiFi in the car? Is this a ruse to get the data that everyone says is so valuable about us?
What happens if the antenna is all of a sudden covered in foil that is grounded? Or the lead to the antenna gets accidentally snipped by a handy pair of diagonals?
I'm just tossing this out for chit chat since I don't know a thing about the technology used, and it is cold out and other than throw more wood on the fire and read, I'm looking for some intellectual challenge and discussion.
Dale