Actually, the U.S. Department of Defense has clearly outlined scenarios in which GPS would be locally shut down and/or jammed; Space.com had an interesting story about it earlier this month.
Another reason is the available of ultrawideband technology (UWB). It's really interesting, relatively inexpensive, and can provide tremendously accurate (1 centimeter) positioning.
No, I don't own stock in it or anything like that (although, as a U.S. citizen, I should).
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Actually, the U.S. Department of Defense has clearly outlined scenarios in which GPS would be locally shut down and/or jammed; Space.com had an interesting story about it earlier this month.
Another reason is the available of ultrawideband technology (UWB). It's really interesting, relatively inexpensive, and can provide tremendously accurate (1 centimeter) positioning.
No, I don't own stock in it or anything like that (although, as a U.S. citizen, I should).
The Swiss Army CyberTool 41. Gotta love a tool that has (among everything else) a wood chisel, a hacksaw, and interchangeable Torx bits.