The StellarMate Plus Manual
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Ekos also supports GPG RA Guider, but this is for RA only--that is, guiding for
DEC still happens, but using the existing guiding algorithms. This guider can be
enabled by going to the Guide Module, clicking on Options (bottom-right) and
then clicking on the GPG RA Guider tab and then checking the Enable GPG
checkbox. This guider is based on the work in this PhD thesis and is the same as
the well-regarded PHD2 guide algorithm known as Predictive PEC. It estimates
the periodic error in the guiding system, and tries to fix it before it happens. This
system should perform about the same as the standard guider for the first period
or two of your mount's periodic error, then improve. When using this system, it's
best to set in advance what your mount's worm-gear period is. For example, the
Orion Atlas pro is about 480s. You enable this in the Guide options menu, in the
GPG RA tab, and then checking "Enable GPG". There are other parameters you
can change, but as indicated earlier, the main one to think about is "Major Period".
It can be used with all Guide star-detection algorithms but has been tested most
and is recommended with SEP MultiStar. It combines a reactive correction whose
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