Think GPS is cool? IPS will blow your mind
For all of their awesome applications — from portable navigation devices, to self-driving cars, to cruise missile targeting — the American Global Positioning System and its Russian cohort GLONASS have two fundamental flaws: They don’t work indoors, and they only really operate in two dimensions.
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Now, these limitations are fair enough; we’re talking about an extremely weak signal that has traveled 20,200km (12,600mi), after all. Passing through concrete and other solid obstacles is hard enough for a strong, short-range cellular signal — you can’t seriously expect a 50-watt signal traveling 12,000 miles to do the same. Detecting a GPS signal on Earth is comparable to detecting the light from a 25-watt bulb from 10,000 miles.