<div dir="ltr">My apologies to all for not being able to attend the meeting. This is a very useful endeavor. For various family reasons, I was unable to participate in almost anything for over a week. The worst of them will end tomorrow when I attend the funeral for my favorite Uncle in Lebanon, TN.<div><br></div><div>I am definitely interested in participating in these discussions.</div><div><br></div><div>Bob</div><div>N4HY</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jun 5, 2018 at 11:54 AM, Michelle Thompson via Ground-Station <span dir="ltr"><<a href="mailto:ground-station@lists.openresearch.institute" target="_blank">ground-station@lists.openresearch.institute</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div class="m_-2398539085548664625gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><div>A conference call was held on 31 May 2018. Presenting was Jonathan Brandenburg, concerning his IHU project that he wishes to publish. </div><div><br></div><div>Open Research Institute will support publishing this open source Integrated Housekeeping Unit (IHU) design intended for amateur radio satellite service payloads. An IHU is a flight computer, controlling all the elements of the payload.</div><div><br></div><div>The call was held courtesy of National Instruments conference bridge. Thank you to Neel Pandeya for making it possible and for supporting open source hardware and software designs. </div><div><br></div><div>The design team for this IHU consists of Zach Metzinger, Jordan Trewitt, Bill Reed, and Jonathan Brandenburg. This started in earnest about a year ago. It it not radiation hardened by design, but is entirely appropriate for low earth orbit (LEO) use. </div><div><br></div><div>Initial design work was presented at the 2017 AMSAT Symposium. </div><div>This is a failover IHU design. It was two fault-tolerant processors. The processor is TI Hercules and the part number is TMS570LS0914PGE. Each processor has two cores, and each core operates in lock-step. There is some flight heritage with this part from the ICI Radar Satellite and a NASA Robotic ARM. </div><div><br></div><div>Included in the design are twin transceivers. The transceiver selected is the AX5043.</div><div><br></div><div>A power amplifier design is in progress. </div><div>There is error correction on the memories. </div><div>This IHU has two “sides”, with one Hercules and one transceiver on each side. There is diversity in the voltage regulators, with the primary side powered by a MAX1556A regulators and a secondary side powered with LTI963As. The diversity in voltage regulators is intended to provide additional resilience. For each side, there is a 3.3volt rail and a 1.2volt rail.</div><div><br></div><div>Software development has only just begun. Layout is approximately 80% complete. </div><div><br></div><div>The board has 4 layers and relatively good power consumption based on prototype measurement. </div><div><br></div><div>UPSat from Libre Space was also introduced and referenced.</div><div><br></div><div>OreSat is interested in collaborating and learning more about this design.</div><div><br></div><div>Our consensus is CANbus or Ethernet for flight hardware.</div><div><br></div><div>Jonathan has also made a Raspberry Pi daughterboard for the AX5043. This allows development with the transceiver independent of the Hercules or IHU. </div><div><br></div><div>The drawbacks to the Hercules include terrible documentation and a cumbersome parameterized code generation process for development. Jonathan believes he is getting a handle on this and there is the possibility of him producing improved documentation for this design. </div><div><br></div><div>We also discussed the VA10820 - Radiation Hardened ARM® Cortex®-M0 MCU <a href="https://www.voragotech.com/products/va10820" target="_blank">https://www.voragotech.com/<wbr>products/va10820</a>. This is approximately $700, but has good stats and a well-documented toolchain. There is at least one design that is open source that could be used as a basis for an IHU. </div><div><br></div><div>Jonathan to publish the IHU at <a href="https://github.com/phase4space/payload-IHU" target="_blank">https://github.com/<wbr>phase4space/payload-IHU</a></div><div>Jonathan and Michelle to press for review of the design.</div><div><br></div><div>Michelle to publish minutes.</div><div><br></div><div>Michelle to arrange for additional IHU conference calls. </div><div><br></div><div>Microsemi’s SmartFusion2 and PolarFire devices were brought up outside of the meeting. They are actively advertising radiation hardening for these parts and they may be available now and should be discussed. </div></div></div></div></div></div></div></div></div></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr" style="font-size:small">Bob McGwier</div><div dir="ltr" style="font-size:small">Founder, Federated Wireless, Inc</div><div dir="ltr"><font size="2">Founder and Technical Advisor, HawkEye 360, Inc</font><br><div style="font-size:small">Research Professor Virginia Tech</div><div style="font-size:small">Chief Scientist: The Ted and Karyn Hume Center for National Security and Technology<br></div><div><div style="font-size:small">Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY<br><div><span style="font-family:arial">Faculty Advisor Virginia Tech Amateur Radio Assn, Trustee K4KDJ</span></div></div></div><div style="font-size:small"><span style="font-family:arial">Member of PVRC (Roanoke-Blacksburg), TAPR, life member of ARRL and AMSAT, <a href="http://NRVR.ORG" target="_blank">NRVR.ORG</a> (Rocketry)</span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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