Re: APCC pointing model effects on DEC tracking

david w pearson

sorry for confusion......AP1200.
I understand that the APCC pointing  model not only improved pointing but helped tracking according to Ray.
I experienced it myself after creating a pointing model.
Since i have an issue that involves APCC pointing model, maxim DL guiding, and AP1200 i need to understand APCC part in the process to determine how to resolve.  I thought that APCC issues delta mount RA/DEC commands according to the pointing model.
My question is does these delta RA/DEC commands require a convergence over time or not?
Meaning if the polar alignment error was vastly different from what the pointing models assumes, what happens and how does APCC and mount behave?

On Tuesday, February 23, 2021, 10:23:52 AM PST, Roland Christen via <chris1011@...> wrote:

The DEC axis tracking error grows up to about 2-3 arc-sec tracking error
The Dec axis doesn't track. There is no tracking in Dec, only the RA axis tracks at sidereal rate. Do you mean Dec Guiding by any chance?
APCC pointing model does not set custom tracking unless you turn on the custom rate in APPM.
Which mount are we talking about?


-----Original Message-----
From: david w pearson via <p.davidw@...>
Sent: Tue, Feb 23, 2021 11:43 am
Subject: [ap-gto] APCC pointing model effects on DEC tracking

Notice something new with my autoguiding, Maxim DL,APCC pointing model setup upon initial guiding during startup.   thereafter it doesn't happen.
The DEC axis tracking error grows up to about 2-3 arc-sec tracking error before converging back to normal at 0.1 to 0.3 arcsec in about 60 seconds.
During this time, i use an aggressiveness of 10 In maxim DL.      Does the APCC pointing model tracking algorithm try to compensation for DEC tracking 
errors, using the pointing model, that would account for the 60 sec tracking error convergence?      Also i have noticed that my pointing point model probably needs to be redone as
 my pointing errors seem to be worse than right after model build.     My first impression is my polar alignment may be further off than the pointing model is assuming?
Any insight that would direct me toward the solution would be appreciated.

Roland Christen

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