Path: csiph.com!aioe.org!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail From: jimp@specsol.spam.sux.com Newsgroups: sci.physics,sci.physics.relativity Subject: Re: Sensors in Motion Launches MEMS-Based Inertial Nav System Date: Mon, 27 Jul 2015 22:52:36 -0000 Organization: A noiseless patient Spider Lines: 31 Sender: Jim Pennino Message-ID: References: <7c9e8c-9t1.ln1@mail.specsol.com> Injection-Info: mx02.eternal-september.org; posting-host="db4120ef82bbc153014637d4cd15a795"; logging-data="20668"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX182FQgCsMN+56hNm9xLkJjc" User-Agent: tin/2.2.1-20140504 ("Tober an Righ") (UNIX) (SunOS/5.10 (i86pc)) Cancel-Lock: sha1:8JnnsXXIthksCYq580s78VOn9To= Xref: aioe.org sci.physics:509938 sci.physics.relativity:358842 In sci.physics Yousuf Khan wrote: > On 27/07/2015 3:08 AM, Fabian Russell wrote: >> Yes, of course, they do drift. >> >> But the point is that for certain military applications they can >> adequately replace GPS. Cruise missiles, for example, will only >> be in flight for a few hours, at most, and thus the drift will >> be negligible. The same for smart bombs. The advantage is that >> MEMS INS cannot be jammed. > > It would extremely useful in consumer electronics to integrate a MEMS > chip into a traditional GPS system. The GPS could still keep going even > when you're in a long tunnel, or inside an underground garage, or > something like that. It would supplement the GPS signal, and keep the > car on track even while the GPS signal was nowhere to be found. It > wouldn't have to be as accurate as military MEMS, of course. > > Yousuf Khan As there is usually only one way in or out of a tunnel or underground garage, I hardly see where GPS is needed there at all. Perhaps some people don't know what those signs with an arrow and the word "exit" mean. Also, MEMS is a type of component, not a system. https://en.wikipedia.org/wiki/Microelectromechanical_systems -- Jim Pennino