Timeline for Navigating in space with only cameras
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| Nov 7, 2017 at 16:15 | comment | added | Dave Gremlin | @Organic Marble - good point. Canopus star trackers were very common on early, unmanned, interplanetary spacecraft too. I think they used Canopus and the Sun to 'triangulate' their position | |
| Nov 4, 2017 at 12:06 | comment | added | Uwe | Do some math to determine the possible accuracy of an altitude estimation when the distance to Earth is about 400 km, the camera optic is selected to view the full diameter of Earth and the sensor has a resolution 4 or 16 megapixels in square format. What is the difference in altitude when there is one pixel more or less for the diameter of Earth? | |
| Nov 4, 2017 at 12:03 | vote | accept | Dragongeek | ||
| Nov 4, 2017 at 4:13 | comment | added | uhoh | @Ohsin that's excellent! Their altitude uncertainty looks like it ranges from 10km (probably no good features to match) down to maybe hundreds of meters or less when they have good features to match. With balloons and uncertainty in atmospheric motion and temperature, position uncertainty diverges quickly after the last "good fix", whereas in the vacuum of space, if you have a good ephemeris and clock, you can project farther into the future. Have they written up and published their results somewhere? | |
| Nov 4, 2017 at 3:57 | answer | added | uhoh | timeline score: 3 | |
| Nov 4, 2017 at 3:04 | comment | added | Organic Marble | The space shuttle had star trackers that matched star pairs with a database to determine the orbiter's attitude. You can read about them here: spaceflight.nasa.gov/shuttle/reference/shutref/orbiter/avionics/… | |
| Nov 4, 2017 at 1:51 | history | edited | Nathan Tuggy | CC BY-SA 3.0 |
Removed open-ended resource request (good answers are likely to provide suitable references anyway); fixed spelling/grammar
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| Nov 4, 2017 at 1:00 | history | tweeted | twitter.com/StackSpaceExp/status/926615180636774400 | ||
| Nov 3, 2017 at 19:28 | comment | added | Ohsin | Spacecraft orbit determination relies on ground based tracking and Navigation systems like GPS, IRNSS(or NavIC) if spacecraft is equipped with receivers for those. But people are also looking into completely autonomous terrain relative orbit determination! medium.com/planet-stories/… | |
| Nov 3, 2017 at 19:25 | comment | added | uhoh | Will your spacecraft have an ephemeris (prediction of the location of solar system bodies in the future) and a nice, stabile clock? Or do you want to try to measure the distance to the Sun using the Sun's diameter? That will be a little harder because the Sun's photosphere's edge has a somewhat "fuzzy" terminator. | |
| Nov 3, 2017 at 17:24 | review | First posts | |||
| Nov 4, 2017 at 1:52 | |||||
| Nov 3, 2017 at 17:24 | history | asked | Dragongeek | CC BY-SA 3.0 |