How did you manage to have a "plain old soundcard" that could put out 60kHz? Since human hearing tops out at 20kHz, standard sound cards have a maximum sampling rate of 48kHz, so there's no way you could get more than 24kHz out of that. Perhaps whatever aliased frequency did come out happened to produce enough resonance at 60kHz to satisfy the receiver?
The whole purpose of this mission was to measure the variations in the moon's gravity by flying at a very low altitude. Consequently, those gravitational variations introduced changes in the orbit requiring relatively frequent corrections. It follows that the closer you orbit, the more actively you'll have to work to maintain that orbit. When you fly low over a mountain, the extra mass in that area will pull you down, and you'll have to correct for that with upward thrust.
The moon's uneven gravity field presents a challenge to ground controllers planning trajectories for low-altitude lunar orbiters. The tug of lunar gravity can alter a satellite's orbit, requiring frequent rocket burns to adjust the spacecraft's path around the moon.
Precisely. That's part of the problem. Why can't everyone use one standard so we can switch from Verizon to AT&T, for instance, just by moving the SIM card?
Here's a similar story from a CS professor at my school. (It used to be found here, but it seems to be gone now. Thank goodness for Google's cache!)
----
From: Michael J Lutz
Subject: Finals Scam: Revenge of the Profs.
The Finals Week item, with 50 things to do during a final you
know you will flunk, inspires me to pass along this true story from
RIT. Acknowledgements are due my colleague Ken Reek, and former
graduate student Ed Ford, who together pulled the scam off with
aplomb.
Several years ago, Ken was assigned two sections of a large service
course taken primarily by business students. The final exam was
multiple choice, and had a well-deserved reputation for being easy to
cheat on (one proctor, 250-300 students). Ken was determined to plug
this hole, at least for one term.
One nice thing about such a large class is that no student knows
everyone else who is enrolled. Using this, Ken asked Ed to attend the
final and pretend to take it like everyone else. Ken also told Ed to
be as blatent as possible about cheating.
At the start of the exam, Ken announced that anyone caught cheating
off another student's paper would have his or her exam confiscated and
would fail the course. As the exam progressed, Ed was peering all
around, while Ken periodically called out "eyes on your own paper."
After about three such warnings, Ken bounded up the stairs, crossed to
Ed's seat, grabbed the exam, tore it to shreds, and shouted "You're
outta here!" According to Ken, Ed's facial expression was a perfect
combination of shock and terror.
For the rest of the exam, the room resembled a monastery where monks
were carefully and studiously working on sacred scrolls.
Mike Lutz
Rochester Institute of Technology
Rochester, NY 14623
MapQuest was supplied with imagery by GlobeXplorer. Both Keyhole (hence Google) and GlobeXplorer use a mix of public and private sources, so some of what you see on one service is also on the other. For example, many states have started taking their own aerial photos, which are made available online. I live in NY, and Google shows me the same image of my house that I can get more easily from NYSGIS (at 1 foot resolution, too, whereas Google only goes down to 1 meter). GlobeXplorer, however, has 6 inch resolution imagery for my area (which was in turn acquired from AirPhotoUSA, I believe), so they show that instead. In general, different imagery providers will have different groups of datasets, some of which overlap, so some areas will have the same imagery and some will not.
The A->D card costs that much because it can sample the high frequencies used in radio (up to 20Mhz for this card; compare to your plain old sound card that can only sample up to 44Khz). That part is indeed realtime (otherwise you wouldn't get all of your data...). It's the software running on the host PC that isn't realtime (yet), due to the large amount of processing required for HDTV.
Slashdot Mirror
How did you manage to have a "plain old soundcard" that could put out 60kHz? Since human hearing tops out at 20kHz, standard sound cards have a maximum sampling rate of 48kHz, so there's no way you could get more than 24kHz out of that. Perhaps whatever aliased frequency did come out happened to produce enough resonance at 60kHz to satisfy the receiver?
Spaceflight Now, March 21, 2012
That would be why it was linked in the summary.
Precisely. That's part of the problem. Why can't everyone use one standard so we can switch from Verizon to AT&T, for instance, just by moving the SIM card?
----
From: Michael J Lutz
Subject: Finals Scam: Revenge of the Profs.
The Finals Week item, with 50 things to do during a final you know you will flunk, inspires me to pass along this true story from RIT. Acknowledgements are due my colleague Ken Reek, and former graduate student Ed Ford, who together pulled the scam off with aplomb.
Several years ago, Ken was assigned two sections of a large service course taken primarily by business students. The final exam was multiple choice, and had a well-deserved reputation for being easy to cheat on (one proctor, 250-300 students). Ken was determined to plug this hole, at least for one term.
One nice thing about such a large class is that no student knows everyone else who is enrolled. Using this, Ken asked Ed to attend the final and pretend to take it like everyone else. Ken also told Ed to be as blatent as possible about cheating.
At the start of the exam, Ken announced that anyone caught cheating off another student's paper would have his or her exam confiscated and would fail the course. As the exam progressed, Ed was peering all around, while Ken periodically called out "eyes on your own paper." After about three such warnings, Ken bounded up the stairs, crossed to Ed's seat, grabbed the exam, tore it to shreds, and shouted "You're outta here!" According to Ken, Ed's facial expression was a perfect combination of shock and terror.
For the rest of the exam, the room resembled a monastery where monks were carefully and studiously working on sacred scrolls.
Mike Lutz
Rochester Institute of Technology
Rochester, NY 14623
MapQuest was supplied with imagery by GlobeXplorer. Both Keyhole (hence Google) and GlobeXplorer use a mix of public and private sources, so some of what you see on one service is also on the other. For example, many states have started taking their own aerial photos, which are made available online. I live in NY, and Google shows me the same image of my house that I can get more easily from NYSGIS (at 1 foot resolution, too, whereas Google only goes down to 1 meter). GlobeXplorer, however, has 6 inch resolution imagery for my area (which was in turn acquired from AirPhotoUSA, I believe), so they show that instead. In general, different imagery providers will have different groups of datasets, some of which overlap, so some areas will have the same imagery and some will not.
This may be what you're thinking of:r y/l-boot.html?ca=dgr-lnxw04BootFaster
http://www-106.ibm.com/developerworks/linux/libra
The A->D card costs that much because it can sample the high frequencies used in radio (up to 20Mhz for this card; compare to your plain old sound card that can only sample up to 44Khz). That part is indeed realtime (otherwise you wouldn't get all of your data...). It's the software running on the host PC that isn't realtime (yet), due to the large amount of processing required for HDTV.