[time-nuts] DSAC launches tonight

Poul-Henning Kamp phk at phk.freebsd.dk
Tue Jun 25 06:33:23 UTC 2019


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In message <89d7213a-30a8-de38-a150-fc22ec733d14 at earthlink.net>, jimlux writes:

>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.

How do you orient a choke ring antenna in space ?  Is the distance
for LEO to GNSS orbits long enough that you can still just "point
it upwards" ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.




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