No. That is not what I mean.
No doubt the tech is there if you are prepared to pay through the nose for the commercial varieties. No doubt the military have got something that would do the job, probably called radar or some such.
I mean a box that will detect any GPS receiver, including iPads, smart phones, tablets of all flavours etc. And with the capability to squelch out the ground based morons texting each other or car satnavs. Without the need for a transponder, certified dedicated kit etc. And certainly not at some stupid price.