The laser experiment came through the last full duration test completely solid. On the test prior I used a low battery. Around data sample 200,000 very weird data started to appear. Unless the sensor power system was putting out the energy of Hover Dam something was very wrong. It turns out that when analog to digital converter (this connects the sensors to the computer) starts loosing power it doesn’t die, it just outputs bad data. I cost four hours of testing time but it is very good to know.
With all the troubleshooting Saturday we didn’t get a chance to do the full duration test on the seven flight cameras. That’s today’s task.
You always find things in the full “plugs out” test that never show up any other time. We had one glitch that we chased for a good part of the day and well into the night. When the GPS telemetry system transmits the balloon release system triggered. Now these systems are not connected or even touching each other. In fact they are not even on the same deck. After much very deliberate, one electron at a time troubleshooting the trail of events were revealed. The antenna cable was close to the still camera array bus cable. Power would induct, (yes, from a shielded cable) from one to the other cable and travel to the other side of the vehicle where the where it would induct into the balloon release cable. It would induct through the positive line of the camera cable and the negative line of the release cable. It only happens when the camera system is off and the main controller resets. The antenna was moved and all is well. We’re going to redo the test during the week to make sure.
We loaded at the antennas and stands on the mission control van and did some maintenance on the generator. When the antennas get loaded the mission really starts to feel close.
After pulling the sensor on the laser experiment we found some contamination. We cleaned it up and put it back. We put it through a two hour test run and it worked fine, however it failed during the full systems test. I’ll need to replace it after all. It’s going to be a very busy week.
I’ve just added two more tasks for tomorrow.
1. Replace target sensor on laser array experiment.
2. Reduce laser array firing time.
Oh well, at least it’s working.
Mesospheric Explorer
The Mesospheric Explorer series is designed to investigate the area of the world above 160,000 feet. Here is the prototype on it’s first flight about six years ago and another image with the “hood off”.
The Orbital Ascender
The last system, the laser experiment is just about complete. Today the sensor to array controller interface was built and all the connectors assembled. One more sensor and then on to all the power plugs. It should be all wrapped up tomorrow.
All of the other new systems are complete, however there is still a lot of packaging to do. On Saturday we conducted the last telemetry range test. It was our best results yet. We’ve declared it good and the current setup will be the flight configuration.
Here’s the current systems list for Away 35:
Main command/control telemetry system
Backup position only telemetry system
Six ad cameras with controller
Single horizon still camera with controller
Tandem motor controller
Tandem motor sensor array controller (RPM, temperature, voltage)
Small motor with propeller
Laser array experiment
Spot satellite uplink
Radio beacon
Balloon release system
Backup balloon release controller
200 passive PongSat experiments
9 computer controlled PongSat experiments
Stabilizer fins
Frame
Foam and carbon decks
Parachute
Landing bumper
Balloon rigging, (line, swivels, d rings, balloon adapter)
The last of the new radio gear arrived for Away 35. Anytime a new piece of hardware goes into the mix it all needs to be retested. We always conduct the range testing in the same place. We “shoot the beam” down the road by the shop that has a tremendous about of radio interference. We walk down the road carrying the system stopping every hundred feet. While we’re doing that the folks in the mission control van are sending commands to the unit and looking at signal strengths.
It was a good day to be in mission control and a bad day to be walking the road. It was well over 100 degrees and we just melted. Mission control was nice and cool with it’s industrial strength air conditioner.
Mark and Bob emerging from mission control.
The laser housings for the Away 35 laser array test arrived. We couldn’t resist firing the lasers up. It’s our own Death Star. Although on the mission they won’t be mount with a rubber band.
Last Saturday was another day of bits and boards for Away 35. We modified the main controller’s power harness. We reprogrammed the extra camera controller to take more high altitude pictures and less on the way up. We also reprogrammed the backup balloon release system to take into account the higher altitude Away 35 will reach. After the system was reinstalled on the vehicle we ran a full duration test.
A duller, but harder and very important was also done. The system shelves were completely gone through and reorganized, (ah the excitement of space).
We’re about a four days away from systems completion. After that we’ll be running the full up test. Then on to flight.
Last Saturday the Sacramento L-5 Society Chapter had their monthly meeting at our facility. They had two speakers. One talked about what’s happening with Lunar exploration and the other (our own Karl) talked about Helium-3 and fusion.
One of our vehicles did a 360 degree roll just after balloon burst. It took this shot while hanging upside down at 106,000 feet.
This is not a JPA photo, but I would like it to be. This is what I want to see out the window.
Taken by the Cassini Spacecraft, it shows Alpha Centauri seen from the rings of Saturn. I must go and see that scene with my own eyes.
« Previous Entries Next Entries »
