A Host of MER Posts
4 Sep 2002
(Source: Cornell University)
Week Ending August 31, 2002
It's alive! Our first rover arm has been delivered, and it's working beautifully.
Each MER rover will carry a robotic arm that we'll use to position four of our scientific instruments: the Microscopic Imager, the APXS, the Moessbauer Spectrometer, and the RAT. The arm is the same size as a human arm, and like a human arm has a shoulder, an elbow, and a wrist.
Our first flight arm -- one of the ones that's going to Mars -- recently arrived at JPL, and we've been putting it through its paces. We haven't put any of the instruments on it yet, though that'll happen soon. What we've done this past week has been to mount the arm on a rack, hook it up to the rover's electronics, and start seeing how well it moves. The real question on our minds has been how well the arm will be able to position the instruments, and the preliminary answer seems to be very well indeed. We still have to actually mount it on the rover body and run it at real martian temperatures, but all the indications so far are that it will be able to put the instruments where we want them every bit as accurately as we had hoped, or maybe even better.
And on top of that, it's really something to see as the arm moves all its joints and reaches out toward some imaginary martian rock. It'll be doing the real thing soon enough.
Week Ending August 24, 2002
Well, if the last couple of weeks weren't enough to teach us how to do science with a rover on Mars, there isn't much hope for us. We've just finished a ten-day test using the FIDO rover to simulate twenty martian days of MER operations. The FIDO guys took their baby out to a site somewhere out in the American Southwest, and we drove it from JPL just like we'll drive the real MER rovers when they're on Mars. The "landing site" was fantastic, with no vegetation, great rocks, and many geologic puzzles for us to solve. Very Mars-like!
In our twenty "sols" of operations, we drove the rover more than 200 meters, made a bunch of detailed measurements of the chemistry of the rocks, and took a lot of spectacular pictures. Most importantly, the whole team learned an enormous amount about how to do this kind of thing on Mars. We have some great field geologists on our team, but they're used to doing geology in their own boots, with their own eyes and hands. FIDO has helped them to re-learn their trade, teaching them how to do field geology through the eyes of a robot.
We made some mistakes, of course, which in a way was the best news of all. We're going to have to do this for real in about a year and a half, so it's good to make mistakes we can learn from now!
Week Ending August 10, 2002
It's been almost impossible to even write a news update this week, since we've been so busy. We're in the middle of a test with the FIDO rover. FIDO is a rover similar to the ones that we'll be sending to Mars, and it's one that we can send out into real field settings to do real geology. Right now it's somewhere in the American Southwest (I don't know where), and we're driving it every day as if it were on Mars. The reason I don't know where it is is that this is a "blind" test. When we run the real rovers on Mars we're not going to know very much at all about where they really are, so making the test blind like this -- not telling the science team where the rover is -- is the only realistic way to do the test.
We're three days into a 10-day test as I write this, and it's going wonderfully so far. The geology at the "landing site" is fantastic, the rover is working well, and the team is working well together. Watch this website for updates... as soon as we have some images from the test that we can post, we'll put 'em here.
Week Ending August 3, 2002
We just completed a test that lasted for an entire month. That may be your definition of a nightmare, but it's our way of learning how to avoid trouble when we're on the surface Mars. They are called "thread tests," and there will be several of them over the next few months. During the most recent exercise, we practiced the "uplink" procedure. That's when we send information from Earth to Mars to command the rovers. We used images of the Martian landscape taken from the Pathfinder mission to formulate our uplink plan. If this were the real thing, we'd be working with images sent to us from the rovers. We studied surface features, selected rock targets, and created a list of commands. We practiced using all the procedures, processes and software that we will use for an uplink during the actual mission. As with any test, there were glitches along the way. But they helped us identify what needs to be corrected before we land on Mars.
Week Ending July 27, 2002
Shake a science camera and you might kick up some dust. That's what happened to the Microscopic Imager after a vibration test this week. When a delicate science instrument undergoes such a test, more tests are conducted "post-vibe" to make sure it is still functioning properly. One of these functional tests showed that small dust particles somewhere in the optics of the MI had moved slightly during vibration. This was not unexpected and we were able to confirm that we still have a healthy MI producing excellent images. But we want to take care of the dust problem and the good news is that it can be easily corrected.
Week Ending July 20, 2002
As we get closer and closer to flight, our attention is gradually shifting away from the individual instruments, and more toward the business of putting the rovers together. We're almost "done" now with many of the instruments on an individual basis. The flight Mini-TES and Moessbauer instruments really are done. The flight APXS instruments are half-done, and the parts that aren't done yet are coming together quickly in Germany. The RATs should be done in a few weeks, and we now have the first flight Pancams and Microscopic Imagers in our hands and taking pictures. There's still plenty more work ahead, of course, but we really are getting to the point where getting ready to put things into the rovers is the main focus.
And so we're very interested in how the rovers are doing! Fortunately, they seem to be doing pretty well. This past week, the Dynamic Test Model rover did its very first "mobility test". In other words, our baby took its first steps! It didn't go far, and the test wasn't without a glitch or two. But we have a real test rover now that can move, and that's a huge accomplishment.
Week Ending July 6, 2002
We had another big week camera-wise! Last week it was the Engineering Model of the Miscroscopic Imager. This week, it was the first flight Pancams. It takes awhile to get these things ready, that's for sure. But Dave Thiessen and the rest of the camera crew at JPL put in some very long hours last week, and we now have the first real flight Pancams -- ones that are going to Mars -- in our hands. They're beautiful! It'll be a little while before they're taking pictures of anything interesting, but as soon as we have something to show we'll post them here on this site.
And there have been big rover developments lately too. For a look at some recent progress, here's a picture of the Dynamic Test Model rover. This one isn't going to Mars -- it's a test model that we'll use to make sure that the ones that really are going can withstand all the rigors of flight. But it looks very much like what part of each flight rover will look like when it's folded up and stowed inside it's lander.