#heo — Public Fediverse posts

HEO to use Planet satellites for non-Earth imaging

https://fed.brid.gy/r/https://spacenews.com/heo-to-use-planet-satellites-for-non-earth-imaging/

View of spent LVM3-M2 upper stage in orbit by HEO. It appears the stage insulation is blistering and coming apart. Nothing should be sticking out from it like that.

https://www.linkedin.com/posts/high-earth-orbit-robotics_this-is-the-spent-upper-stage-of-indias-activity-7470980241012875265-DxIs

#LVM3M2 #LVM3 #ISRO #HEO

National Reconnaissance Office adds HEO, SatVu and Sierra Nevada to commercial imaging program

https://fed.brid.gy/r/https://spacenews.com/national-reconnaissance-office-adds-heo-satvu-and-sierra-nevada-to-commercial-imaging-program/

HEO’s satellite-to-satellite imaging uncovers secrets of Chinese tech-test spacecraft

https://fed.brid.gy/r/https://spacenews.com/heos-satellite-to-satellite-imaging-uncovers-secrets-of-chinese-tech-test-spacecraft/

HEO looks to expand satellite imaging beyond low Earth orbit

https://fed.brid.gy/r/https://spacenews.com/heo-looks-to-expand-satellite-imaging-beyond-low-earth-orbit/

Testbench passing for #polyphase channelizer for #Haifuraiya, an #opensource #HEO or #GEO communications #satellite design. Applicable to #hamradio, 5 GHz uplink and 10 GHz downlink. Shown is the transponder receiver filter.

If you’d like to join this or any other @OpenResearchIns project, get in touch.

There has been a lot of #OFDM work for #neptune, and #polyphase work for #Haifuraiya over the past week. We're looking forward to another great week ahead.

Haifuraiya, by the way, is an #opensource #heo or #geo communications payload for #hamradio.

There is a lot of great work going on, but if you have not been hearing about it and want to, then please add yourself to our newsletter audience here: https://www.openresearch.institute/newsletter-subscription/

After the COBS protocol is implemented on the #amateur #satellite downlink, then we move to to uplink receiver.

Here's how FSK can be received with HDL (Verilog). Diagram in the image below.

There's more advanced ways to do it, but this is where we're starting over at ORI. The multi-channel uplink will be done with multirate techniques. This is for #opensource #HEO payload work.

If you want to learn more or keep up, then please visit https://openresearch.institute/getting-started. Everyone welcome, CoC enforced.

Final stretch of an important component for a COBS protocol decoder. This goes into #Haifuraiya which is an #opensource #HEO or #GEO #amateur #satellite on the #microwave bands.

This writeup shows how the #VHDL was designed for the #FPGA used.

There's a bug with tlast right now, but it's a problem only when frame delimiters are stretched more than a byte. This isn't something that "should" happen, but it "could", so the decoder is designed to tolerate it.

https://github.com/phase4ground/adi_adrv9371_zc706/blob/adrv9371-zc706-dvbs2-integ/design_docs/cobs_decoder/COBS_dec-Entity-Design.md

#opensource #fpga work for #amateur #satellite. Better testbench revealed mistakes in the combinatorial part of the #HEO transponder design. Will get fixed today. This is a COBS protocol decoder, to make the downlink baseband frames much more resilient.

The current #JAMSAT Journal has Open Research Institute's #opensource #amateur #HEO #satellite proposal, called #Haifuraiya. Plenty of details, runs pages 17-29.

In Japanese, kindly translated from English by Mikio Mouri JA3GEP.

For complex RFICs, the behavior is set by profiles or configuration files. For an #opensource #amateur #HEO #satellite we are working on at #ORI, the profile sets the symbol rate as low as the chip can go: 10 MHz.

Here in the image we are at an intermediate step of modifying rates. On a spectrum analyzer is data from a DMA read coming from a Zynq, transferred to an AD9371, and TX at 2 GHz in the lab.

Volunteer on this or a growing number of other projects at http://openresearch.institute/getting-started

For complex RFICs, the behavior is set by profiles or configuration files. For the #opensource #amateur #HEO #satellite we are working on at #ORI, the profile sets the symbol rate as low as the chip can go: 10 MHz.

Here in the image we are at an intermediate step of modifying rates. On a spectrum analyzer is data from a DMA read coming from a Zynq, transferred to an AD9371, and TX at 2 GHz in the lab.

Volunteer on this or a growing number of other projects at http://openresearch.institute/getting-started