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December 26, 2009 12:40 am by Luke Maurits
![So, I got a USB Bluetooth dongle for Christmas, which means I can now talk to my Wiimotes, including asking for their accelerometer readings. I plan to use this to practice writing some basic Kalman filters so I can talk about navigation for CLLARE with a little more confidence/experience. ... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
December 28, 2009 9:52 pm by Rocket-To-The-Moon
![This is seriously exciting stuff to me. I don't have the background to handle the math, but inertial guidance is so awesome to me. I look forward to hearing how this goes. gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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November 20, 2009 1:06 am by Luke Maurits
![Almost all of the navigation discussion so far has centered around inertial navigation, which is an important part of the story but by no means the whole thing. Ideally we want to combine our inertial estimates of position and velocity (both translational and rotational) with as many other estimates... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
December 22, 2009 12:02 am by Luke Maurits
![Here is a plot, using the values for a and p_t from above. The range l ranges from 192,000 km (mid way point) to 200,000 km.
As you can see, p_e stays constant for about 1000 km at a time, making this pretty useless as a ranging technique for most of the trip.
However, this is an extremely naive... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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December 4, 2009 5:59 pm by Rocket-To-The-Moon
![Does anyone remember this thread from Reddit?
It looks like it isn't as far fetched as we thought. NASA is using a similar technique to determine the precise location of the Lunar Reconnaissance Orbiter. gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
December 4, 2009 5:59 pm by Rocket-To-The-Moon
![Does anyone remember this thread from Reddit?
It looks like it isn't as far fetched as we thought. NASA is using a similar technique to determine the precise location of the Lunar Reconnaissance Orbiter. gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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November 18, 2009 7:10 pm by Luke Maurits
![I have been reading/thinking about the hardware side of the inertial navigation system. In some sense we won't need to make this decision for a while, because the meat of the work will be in the filtering algorithms, which are indifferent to the hardware, but it's never too soon to start... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
November 20, 2009 6:40 am by Rocket-To-The-Moon
![Excellent discussion! This is a problem that is going to take a lot of really smart people to solve. I'm sure that an off the shelf solution is best, but that would also cost hundreds of thousands of dollars. I really think that this is an area where we can innovate more so than any other in the... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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November 17, 2009 2:37 am by rpulkrabek
![I don't understand much about accelerometers or gyroscopes, I just know that it's possible to extract data from them. I was trying to think how would an accelerometer be used in space when there isn't a gravitational field to give a reference position, such as, which way is up. I then... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
November 17, 2009 3:06 am by Luke Maurits
![Inertial nagivation requires both accelerometers *and* gyroscopes. It's quite easy to find packages which include both instruments inside a single physical housing. The gyroscopes can measure angular acceleration – integrating this twice (if done with proper filtering) is sufficient... gopost](/wp-content/plugins/simple-forum/styles/icons/default/gopost.png) |
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