https://www.jpl.nasa.gov/news/news.php?feature=7430
and, as well, COSMIC-2 is being deployed - 6 satellites each carrying a fancy GPS receiver that does two things: Precision Orbit Determination (POD) using a choke ring antenna; Occultation measurements of the atmosphere using a directive array of helical antennas facing the limb.
https://twitter.com/AF_SMC/status/1141099481628364808 has a nice view of the COSMIC-2 satellites - they're in the middle and you can see the 12 element array. Yes, I suspect that the dimensions of the form for the helix are very close to that of a standard small Solo drink cup, but these are a fancy 3D printed material that can stand up to radiation and atomic oxygen.
These spacecraft fly with the array antennas pointed at the limb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
