UWE-3 News

UWE-3 News: Status report

On 21st of May 2016 UWE-3 celebrated 2.5 years in space without any significant failures. Batteries, EPS, OBC and ADCS are fine, nevertheless we were confronted with a minor problem with one of the radios UWE-3 autonomously recovered from. Since then UWE-3 is in a very stable condition again.

Some weeks ago we have re-initiated operations with UWE-3 on an interim basis. The goal is to test new magnetic control algorithms in space. Therefore we operate the satellite on the 436.395200 MHz frequency and perform data downloads from time to time. In the figure below the satellite’s rotation rate w is shown for one of the experiments. The goal was to establish a rotation about the satellite’s X-axis (blue) at 10 deg/s while the Y/Z-axes should be at 0 deg/s. In general the desired rotation rate could be achieved but with major deviations from the setpoint. With the intention of optimizing the relevant control laws we will continue with these experiments within the next days and weeks.

UWE-3-news-23-05-2016

During our experiments we received an outstanding support from the radio community from all over the world we are very thankful for. The received packets were instantaneous injected into our algorithms and delivered an important contribution to our research work. We would like to express our special thanks to DK3WN, PE0SAT, DL8MCO, EU1XX, ON4HF, Rainer, JA5BLZ, JA6PL, CU2JX, LU4EOU, JA1GDE, SP7THR, G7GQW, YC3BVG, JF1EUY, JE9PEL, JE1CVL, JO1PTD, ZL4JL, EA7ADI, K4KDR, JA0CAW, JH4XSY, PA2EON, SM0TGU. THANK YOU!

Yours sincerely,

UWE-3 Team.

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UWE-3 update 03-07-2015

UWE-3 Status report

UWE-3 redundant UHF SubSystem

After the communication anomaly and the autonomous recovery of UWE-3 two weeks ago we uploaded an extended software to the OBC to analyze the event in detail. As we already have known the EPS, OBC and ADCS were not affected, so the secondary radio.

During the tests made possible by the new software we temporarily switched back to the primary radio to check its electrical characteristics and communication performance. As the values were promisingly normal we performed extensive communication tests without seeing any existing anomaly. Therefore we will continue normal operation.

UWE-3 News

UWE-3 News 12-03-2015:

Software update of all on-board micro-controllers.

In the beginning of February 2015 we uploaded new software images for all UWE-3 subsystems to the satellite, which comprise in total 3 images on 9 micro-controllers. This software was installed thereafter and is since then successfully operational on UWE-3. The software update targeted major improvements for the attitude control of the satellite, which was the focus of tests right after the update.

UWE-3_News-Attitude-Determination-and-Control

The satellite now is back to a preliminary un-operated state (switching between the on-board computers every 4 days) while we process the data and decide on future operation plans. Thanks a lot for your great support! Especially we want to thank: CX8AF, DK3WN, EU1XX, G7GQW, IW0HLG, JA0CAW, JA1GDE, JA5BLZ, JA6PL, JE1CVL, JE9PEL, JO1PTD, LU4EOU, ON4HF, PE0SAT, R4UAB, Rainer Rothe, SP7THR, VK5HI.

Yours sincerely, UWE-3 Team

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UWE-3 Temporary end of operations

UWE-3 BatchToday, more than one year after launch, there will be a temporary end of operations caused by the end of funding.

However, UWE-3 is in a very good health condition with fully charged batteries and operations may be continued depending on future research plans.

Without any reception from ground, UWE-3 will carry out a warm reset every four days and switch regularly between the redundant on-board processors and radios. Therefore, UWE-3 will switch back to its nominal frequency of 437,385 MHz.

Nevertheless we appreciate the extensive support we received from the HAM amateurs in the past and hope that also in the future the status of UWE-3 will be monitored with your support, like you did so many times in the past year. Thank you so much for the very helpful cooperation in this respect!

Yours sincerely,

UWE-3 Team