3 ms·
INS accumulates error over time, all of such systems require absolute position fixes (often via GPS) at regular intervals to remain accurate.
by malwrar 1y ago
INS accumulates error over time, all of such systems require absolute position fixes (often via GPS) at regular intervals to remain accurate.
- ho_schi 1y agoYes. INS loses precision over time. But not that much, the wiki states 650 meters in an hour. Is that enough for crossing the Atlantic Ocean with an airliner? Cheap car navigation can bring you through long tunnels (kilometers). INS Navigation is old. It was used in V2 rockets. Primitive civilian systems were available in the B707, better in the 747 (70ies). Now we have them for many years in Integrated Circuits (I don’t know about their precision). The things modern cruises missiles like Taurus do are impressive. IF GNSS is not useable they use INS. INS loses precision. But they add a radar altimeter and compare that to locally stored map data or an image recognition (IR-Sensors looks for specific items on waypoints) to recalibrate in flight. One problem seems that we rely on GNSS correcting the INS. That’s fine if the signal is lost, INS takes over. That’s bad if the signal is spoofed, GNSS lies to INS and INS copies the error. That’s what happened over the Middle East and East Europe. I’m not sure if pilots can turn that auto-correction off. I hope so. PS: Please don’t remember what I mentioned when you watch Top Gun 2. The movie would be short.