Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!uakari.primate.wisc.edu!dali.cs.montana.edu!milton!xanthian@zorch.SF-Bay.ORG From: xanthian@zorch.SF-Bay.ORG (Kent Paul Dolan) Newsgroups: sci.virtual-worlds Subject: Re: optical gyros Message-ID: <11843@milton.u.washington.edu> Date: 28 Nov 90 13:38:20 GMT References: <11727@milton.u.washington.edu> <11764@milton.u.washington.edu> Sender: hlab@milton.u.washington.edu Organization: SF-Bay Public-Access Unix Lines: 13 Approved: hitl@hardy.u.washington.edu The way to get past the drift problem with optical gyros is to use some other system to give you a ground truth, perhaps a system whose location accuracy or stability is better but whose sampling rate is too slow. That way, the optical gyro gives you excellent short term sensitivity and accuracy, while the ground truth from, say, an infrared triangulation system, is averaged and fed back as an error correction for the long term drift of the optical gyro. Lots of military navigation hardware is designed along similar lines. Kent, the man from xanth.