[evlatests] planet tracking

[Bryan Butler]

just to put some numbers on things:

internal ephemeris style tracking:
    dra = -0.26"
    ddec = -0.14"

polynomial style tracking:
    dra = -3.56"
    ddec = -2.54"

these from OMFIT fits.

it is also clear that the polynomial style tracking has a tracking error 
- going in the direction of roughly 45 deg PA.

i am checking now to be sure i didn't screw up the numbers that went 
into the polynomial tracking commands.

	-bryan


Bryan Butler wrote:
> i've tested this again, at K-band.  it's clear that there is an offset 
> in the "polynomial" style tracking.  it's harder to tell with the 
> internal ephemeris style, because i can't self-cal and the data was 
> taken during day time last week so the phase is not what one might like 
> for such an experiment.  if i can get some time, i will try this again 
> with jupiter, which is at least an early nighttime object, to see if i 
> can hit better phase conditions.  i'll summarize all of this at this 
> morning's test meeting.
> 
> 	-bryan
> 
> 
> Bryan Butler wrote:
>> i tested planet tracking yesterday by looking at venus at X-band.  as 
>> far as i can tell, both modes of tracking, with the internal ephemeris, 
>> and by specifying a polynomial, work, and work equally well.
>>
>> i would like to do one more test, at higher frequency, before signing 
>> off on this, but it looks pretty good at this point.
>>
>> 	-bryan
>>
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