| Electronics > Projects, Designs, and Technical Stuff |
| Are accurate clocks really the limiting factor in cheap Inertial Navigation? |
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| CatalinaWOW:
--- Quote from: hamster_nz on March 27, 2019, 04:00:29 am ---Call me cynical, but... Stated problem this solves: We need a technology breakthrough to know where ambulances are in tunnels! Proposed solution #1: We need new tech for an ultra-precise time reference to enable an ultra-precise Inertial Navigation System Proposed solution #2: We could add a CANBUS interface to the navigation system so it can read the odometer and to deduce location when GPS signal is not present Maybe the unstated real problem: We need equivalent GPS navigation functionality for times when the GPS system is either down, cannot be trusted, or is being denied through jamming or other Electronic Counter Measures. However we also need to attract funding. I'm slightly surprised that they haven't also mentioned it would be useful for cave and/or mine rescues... --- End quote --- I just think you aren't cynical enough. It is a three step process. 1. I want to play in this sandbox. 2. I am not creative enough to come up with real applications for my pet rock. 3. Funding requires some applications, so just throw whatever I read in popular magazines and trade journals at the problem. |
| tomato:
I suspect some of you would have ridiculed the GPS system when it was proposed, since we already had a perfectly good navigation system (LORAN) in place. |
| Mechatrommer:
--- Quote from: tomato on March 27, 2019, 04:57:37 am ---I suspect some of you would have ridiculed the GPS system when it was proposed, since we already had a perfectly good navigation system (LORAN) in place. --- End quote --- any person who designed navigation related system know they want to use any possible technological advancement. the classical method is three, dead reckoning algorithm, landmark and beacon. i'm not an expert in GPS but the way i see it, it can be classified as beacon, beacon usually man made for this specific purpose. landmark as mentioned natural star formation, land features (mountains, trees, holes, building, signage etc). triangulation is beacon from comm towers, including your LORAN. dead reckon incl MEMs/INSs sensors, math, cpu and the discussed clocking system. so, nobody ridicule anything if it can help navigation, this is human's life related. except the article in OP and author writing you've highlighted with their "atomic clock buzz no GPS needed" campaign. |
| CatalinaWOW:
I was skeptical of GPS when I first heard of it. Not because LORAN was already here. LORAN has obvious limits, starting with coverage. What I questioned was whether anyone less well funded than the military could deal with all those receivers and the computation in a portable package. Fortunately I underestimated the impact of Moore's law. |
| iMo:
The best mechanical gyroscopes (ie Sperry) did <1degree error in 1 hour, afaik. The mechanical gyroscopes provide the "attitude" to a ref frame, while the MEMS gyroscope outputs the "angular velocity". I would rather not dead recon with a MEMS based system even having atomic clock on the chip :) |
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