Informal news and or stories.
This page will be filled on a nonregular basis with small stories/news about the DTUsat project and related issues.
DTUsat Hardware on Display
In conjunction with LARM, the DTUsat project displayed some of it's HardWare in Rundetårn during "Day of Research", Thursday 19. April. The focus was on the radio parts of the satellite project. Onboard are three radio systems in S, L and ISM bands. The DTUsat GS has a S, L and UHF band systems. An attempt to pick up the COM Tx from top of the tower was hindered by the iron fence surrounding the top and encapsulating visitors creating a Faraday cage.
GS 3m Mast Flashes New Top Pipe
The top pipe of our 3m dish mast has been bend for some time. Further to that the COM distance test revealed that some tweaking was necessary. Hence it was: "Go 3m Mast Touch Up!". After a long day the DTUsat Ground Station 3m Dish Mast now features a shining new top pipe and should be ready for the next COM distance test.
COM on it's first field test
Equiped with a 15m mast from DX-Wire and the COM radio in stand alone configuration the first field test was conducted on 29. March 2012. The test marks the opening of a series of tests leading up to a long distance high altitude balloon test. We did get some data through but overall results were sparse. Lessons learned: Ground Station needs tweaking, wind and glassfiber telescopic masts equals trouble.
Rocket Scientists relays the depeche
On Tuesday 30. August the Rocket Scientists running team participated in the DHL relay 2011. The worlds largest relay with 130.000 signed up and 100.000 completing. This years mixed team completed the 5x5km in 2h 8min 13sec.
One cake was released by Villads (19m 25s) who clearly beated René (20m 47s).
DTU Hosts 7th Intl. CDIO conference
And DTUsat is present, of course.
On the 21. of June 2011 participants of the CDIO conference held at DTU had the opportunity to get a first impression on the pedagogic strategy behind the DTUsat project.
Rocket Scientists Rocks - again!
55min and 52 sec was the total time for the Rocket Scientist team participating in the 3x5km DTU Relay 2011.
Individual times were:
Ulrik Nielsen 17min 17sec
Martin Laage Kragh 18min 03sec
René Fléron 20min 32sec
Our nearest competitor came in 2min 34sec after us.
EPS took a dip in the gamma soup. Reportedly the refreshment had little effect.
Rocket Scientists - Speeds Up
The DTUsat relay team, a.k.a. Rocket Scientist participated in this year DHL relay. The officiel team time this year: 1h 47min 41sec marking a 1min 27sec improve over last years time.
1. 19min 27sec
2. 20min 49sec (project manager)
3. 21min 37sec
4. 22min 50sec
5. 23min 7sec
Releasing one cake.
GPPL Show Down Days
The DTUsat team has allocated time for assembling and testing the GPPL before Easter. First step: Optimization of transmitter.
Track-a-Sat kit nails S-band communication
After several attempts and adjustments the Track-a-Sat kit finally picked up S-band communication from an orbiting satellite, thereby prooving that it is actually possible to receive 2,4GHz signals with the portable equipment. The pass of ECHO (AO-51) lasted approximately 10-11 min, signal was acquired at 8 degress elevation. Total duration of recording with signal(s) was 9min 22sec, with periodic loss of signal.
Below are some excerpts of the recording (AOS Acquisition of Signal, LOS Loss of Signal).
BPSK Demodulator Award/Challenge
The two winners of the BPSK Demodulator Award/Challenge received cakes for their help to the DTUsat project. The challenge was announced on a GNU radio forum and on DTUsat webpage and ran worldwide. Below are pictures of the prizes and winners. Congratulations and thank you to Josh Blum (Ettus Research, California) and Peter Scott (OZ2ABA, Denmark).
Rocket Scientists Rocks! - Update
Five DTUsat members (four students and Project Manager) participated in the DHL relay 5x5km today (1/9-09). With an official total team time of 1h 49min 8sec the average run time was 21min 37,8sec. Or 4min 22sec pr. km.
According to our own time keeping the individual results are:
This releases two cakes, as runner number 2 benefits from the doubt on time accuracy.
All the results has now been compiled. Rocket Scientists came in:
#450 of all teams all days (19891 teams completed the 5x5 km)
#5 of all DTU teams (170 teams signed up for the relay)
#1 of all DTU Space teams
Shaken not Stirred - updated
Well palms were sweaty today when DTUsat-II EM went on the shaker. So far no casualties :-) Tomorrow the final axis: Z but looks ok at the moment.
And here we are on the other side - only three nuts loosened and no subsystem casualties. Nothing that can't be fixed with a bit of glue/lock-tite or tightening. Some shaking spec's (we went for a WC scenario): Sinusodial 20-100 Hz, 12G. Random vibration: 24,8 Grms (pretty noisy).
Never say die!
With only five days left of the semester and no portable payload receiver equipment the long sought field test of the Ground segment Primary Payload seemed very far away. Two long extension cords constituted the primary items in a quick-fix. A stationary PC was converted into a "portable" thereby allowing us to perform the field test with the bird tracker. Despite it not being the final version we really wanted to present some in-field measurements before the summer holidays set in. In between heavy rain-showers (including thunder) and with less than perfect batteries 1200 meters was reached. That's about as far as we can go on Campus (click on the map). In reaching this milestone enthusiastic students and both Hinke A/S, Ettus Research LLC and More Electronics played important parts.
Cold as in Ice Cold
The DTUsat team has conducted the first Thermal Vacuum (TV) test in the test and integration facility. The system is still being refined; so far we've reached 1e-5 mbar and -40°C. The chamber has an in-situ sun simulator for thermal chock test and a thermally decoupled rotationel stage.
FL Smidth Roadrunners
In the world of natural science and technology the competition is fierce but most often unrecognized by the general public. The Shell Eco Marathon is an exception to that rule. With 200 teams from 30 countries winning two first prizes is an amazing achievement - congratulations! The DTUsat project shares three students with the roadrunners.
Challenge: BPSK Receiver for Gnu Radio
If you know how to make a BPSK receiver on Gnu Radio (preferably in GRC) and is willing to make the code not only will you be honoured on these pages but you will win a cake of your own choice.
The code has to run under Gnu Radio and on the USPR board, i.e. if it doesn't run on our set-up we don't need/want it.
We would prefer code in GRC, but that's not a strict requirement.
It has to handle 868 MHz, we have the USRP hardware for that already.
The code has to recover the transmitted data (we have the transmitter).
We do NOT need/want DBPSK demodulation.
Dead-line: 11. May 2009, Midnight CET.
Various internet based shops around the globe offers cake delivery. We are willing to consider specific request, otherwise we'll try to find one close to you.
It could be something like this:
Questions are welcome at: r w f - a t - s p a c e - d o t - d t u - d o t - d k
(omit spaces and dashes - you'll figure it out).
1. May WorkShop
The DTUsat WorkShop today brought about positive results and a convenient chance for some team-building, i.e. Hot-Dogs from the BBQ.
Also the Sun Sensor Calibration Bench finally came up and running. The first Sun Sensors to be calibrated are the ones for TUM MOVE satellite.
Test Receiver for the Bird Transmitters
In order to test the small transmitters carried by the birds we need a receiver. Finding a ready made one has prooven hard and we've given up on that. Our efforts on constructing one from scratch has also prooven fruitless, primarely due to lack of attention.
Finally it seems the solution is based on a SW defined radio using hardware from Ettus Research.
At present we do not have anything up and running but we'll keep posting on the issue as it progresses.
You been Owned
When bored why not nag our sister-project: FL Smidth Car (f.k.a. Øko-raceren). So here's some pic's for you to enjoy :-)
Exchange student from TUM
The student will work on finalizing sunsensors for the MOVE Cubesat.
The exchange was arranged through the informal network: European CubeSat Community. The network consist of European Cubesat Teams and was established during the days of the Vega Maiden Flight Conference at Estec in January this year.
Activities during the summer 08
The webpage has not been updated for a long time. Not due to project inactivity - on the contrary the team members have been busy all summer working on all but the DTUsat webpage. As the time for flight hardware fabrication is closing in efforts have been put into finalizing the DTUsat Test and Integration facility as well.