tag:blogger.com,1999:blog-1592992209402300549.post7083512395828789488..comments2024-03-29T09:08:47.702-04:00Comments on The Silicon Graybeard: Techy Tuesday - Automated Landing Systems for AircraftSiGraybeardhttp://www.blogger.com/profile/00280583031339062059noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1592992209402300549.post-70255651788164939862016-05-11T09:19:52.999-04:002016-05-11T09:19:52.999-04:00I'm not touching that one...I'm not touching that one...<br /><br /> SiGraybeardhttps://www.blogger.com/profile/00280583031339062059noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-16879606472667429422016-05-11T08:34:35.396-04:002016-05-11T08:34:35.396-04:00Want to start a bar fight equal to the 9mm vs .45 ...Want to start a bar fight equal to the 9mm vs .45 argument? Which is better, dual-dual vs triplex avionics on the aircraft. (L1011 / DC 10)Terryhttp://jterryt.blogspot.comnoreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-37504777720537572832016-05-11T08:17:48.984-04:002016-05-11T08:17:48.984-04:00The barge is a robotic ship, so I think we can ass...The barge is a robotic ship, so I think we can assume that it's either stationary over the bottom, or just subject to a very small amounts of motion. There are systems you can buy for your small fishing boat that will do that, (Minn-Kota, the trolling motor company, for example) so I'm sure it's within budget for a boat in that class. <br /><br />If you watch the videos of the April landing (<a href="https://youtu.be/Y3XyQHK3Eqw" rel="nofollow">here</a>), the booster comes in at an angle to the vertical and doesn't go fully upright until right before contact. On the other hand, an airliner doesn't got horizontal until it's past where the ILS leads it to land, and all the wheels are down. It touches down with the nose quite a bit higher than the wheels (the antennas are closest to the nose of the plane). <br /><br />SiGraybeardhttps://www.blogger.com/profile/00280583031339062059noreply@blogger.comtag:blogger.com,1999:blog-1592992209402300549.post-66310178976479293902016-05-11T05:35:41.382-04:002016-05-11T05:35:41.382-04:00I suspect you're right, in that there's a ...I suspect you're right, in that there's a close-coupled feedback system - or, probably, multiple systems - rapidly shoveling large quantities of data between the barge and the rocket. First glance indicates that X, Y and Z are the critical values, but given that the barge is not a rigidly fixed point at zero feet, for whatever value "zero feet" may have, there have to be angular values in the data stream to accommodate the potential differences between a multi-axis 90 degree intersection of rocket and platform. <br /><br />The rocket's vertical velocity slows as it approaches the platform, reaching zero velocity at contact, so the closer it gets to the platform the more time available for attitude correction. At higher altitudes, even though the descent speed is higher, time available for corrections is still fairly long. That's not to suggest descent velocity vs data transfer rates would be a linear relationship, however; iff that's how they're doing it, the baud rate from 10 meters to zero is probably pretty high. Which makes me wonder how much autonomy the rocket itself has over landing control. Anonymousnoreply@blogger.com