Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!rutgers!pyrnj!mirror!datacube!dje From: dje@datacube.UUCP Newsgroups: sci.electronics Subject: Re: Gyroscope Questions Message-ID: <100500003@datacube> Date: Thu, 19-Feb-87 12:11:00 EST Article-I.D.: datacube.100500003 Posted: Thu Feb 19 12:11:00 1987 Date-Received: Sat, 21-Feb-87 06:05:21 EST References: <100500002@datacube> Lines: 40 Nf-ID: #R:datacube:100500002:datacube:100500003:000:1549 Nf-From: datacube.UUCP!dje Feb 19 12:11:00 1987 This is a response to my own note. I've answered many of my own questions, so I'll post my gyro experiment results. The Gyro mounted in my car works great. Trips to and from work (20 miles) and a three hour trip on windey roads have caused essentially unmeasurable errors. Less than 2 degrees (which is the positioning error of my car in the reference driveway). So onward and upward. I'll be testing it in the boat this spring. The next step is to integrate it with the boat's distance log and to derive a single course and distance. (Given a known starting point, where am I: angle and distance?) 99% of the navigation I do is solving this problem, mostly on trips (or legs) under 100 miles, often in the fog. >-- Is it intended to readout in the horizontal plane (azimuth) or is >it intended to be in the vertical plane (roll). Seems to do both. Works fine in the H plane. That's all I need. >-- Is it a free gyro (stands still as the earth turns) or does it > seek north? It doesn't seek north. Why it doesn't stand still as the earth turns, I still don't know. Maybe magic. >-- How is the interface to a four terminal pot normally done? I have it worked out. I apply a two phased voltage to the terminals, then do two measurements to find angle to nine bits. >-- How much error is introduced by motion. Not much. Dave Erickson ------------------------ Datacube Inc. 4 Dearborn Rd. Peabody, Ma 01960 617-535-6644 ------------------------ [ihnp4 | mirror]!datacube!dje