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GOES I-M INR Performance Statistics Help Document
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This document is provided to help explain some of the terminology and
graphical output available on the GOES Image Navigation and Registration
(INR) Performance Statistics web site. In order to gain a fuller
understanding of the data available, two tables (see below) outlining
the GOES INR Performance Specification are also included as a reference.
The primary purpose of the INR statistics plots is to provide a means of
monitoring and trending INR performance as it relates to the defined
specifications.
Weekly Residuals
The "Weekly Residual" plots depict all of the imager/sounder
star and imager visible/IR landmark navigation errors for the entire week
of interest. A residual is defined as the difference between the observed
and predicted locations of a landmark or star measurement within the
instrument field-of-view. The plots entitled "SSAA" (Short-Span
Attitude Adjustment) reflect the actual performance errors observed by the
user. The plots entitled "PARENT" are the performance errors that
would have been observed in the absence of SSAAs. SSAAs are periodic
adjustments to the daily Orbit & Attitude coefficients to correct for
non-predictable spacecraft pointing errors. These plots give an idea of the
overall performance for the week, depicting maximum observed errors and
day-to-day comparisons. These plots will be updated on a weekly basis for
each operational spacecraft.
INR Summary
The "INR Summary" is a table summarizing the navigation and
registration performance statistics in all pertinent categories for the week
of interest. In the REGISTRATION and NAVIGATION STATISTICS tables, the column
"ALL" indicates the combination of visible and IR channel landmark
measurements. This table will also be updated on a weekly basis for each
operational spacecraft.
Imager INR Specification Requirements
| |
Requirements
(3 s) |
| Noon
+/- 8 hr |
Midnight
+/- 4 hr |
Image
Navigation Accuracy: radius
(km at nadir) |
+/-
4 |
+/-
6 |
| Registration
within an image: 25 min (mrad) |
46 |
46 |
| Registration
between repeated images (mrad) |
|
| 15 min |
42 |
70 |
| 90
min |
84 |
105 |
| 24
hours |
168 |
168 |
| 48
hours |
210 |
210 |
| Channel
to Channel Registration (mrad) |
28 |
28 |
| Fixed
Earth Projection and Grid Duration (hrs) |
24 |
24 |
Sounder INR Specification Requirements
| |
Requirements
(3 s) |
| Noon
+/- 8 hr |
Midnight
+/- 4 hr |
| Image
Navigation Accuracy: radius (km at nadir) |
+/-
10 |
+/-
10 |
| Registration
within 120 min sounding (mrad) |
84 |
112 |
| Registration
between repeated soundings(mrad)
24 hours |
280 |
280 |
| Channel
to Channel Registration (ch 8)(mrad) |
22 |
22 |
| Fixed
Earth Projection and Grid Duration (hrs) |
24 |
24 |
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