Comments (11)
There are two different estimations for noise in the LAT. One using scaled noise and one using the SO sensitivity calculator. These are both included here: https://docs.google.com/spreadsheets/d/17KtDIc7pHTdL2F_22RZHve7l0vf-IY_YwMDVXQoEdnE/edit#gid=0. Looks like the scaled one (which is what was input initially) now has a note that it needs to be updated, so it may be beneficial to use the SO sensitivity calculation values instead. Also note that the scaled noise is similar between SAT and LAT, but is still different.
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I am checking with the instrument group to see which version they prefer us to use since the numbers in their spreadsheet also don't match the numbers in the DSR.
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@keskitalo did you use what is in s4sim
for the design sim tool simulations?
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@zonca I did. All noise levels come directly from s4sim
.
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Just put in a pull request for the updated LAT noise values.
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see #8
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They are close for all but UHF, I think. According to Ruhl there were some ad-hoc corrections trying to account for different numbers of detectors but there was confusion about which was better. I took the more conservative value between the two.
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Julian's table with fixed width formatting
Frequency
source 20 27 39 93 145 225 278
--------------------------------------------
CDT 214 177 224 238 320 747 1281
SO_V3 325 387 247 305 385 854 2077
DSR 438 383 250 302 356 737 1840
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SO v3 is what the LAT will be using going forward on the instrument side, and their releases will offer good traceability. We at least know what went into those numbers for these sensitivity numbers. It seems like there isn't a lot of info on what happened to get the DSR numbers but they were tweaked from the SO v3 numbers. The CDT numbers appear to be from very different pixel sizes, so it makes sense that those would be very different.
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Related Issues (11)
- Update pysm model file HOT 1
- trim hardware function sometimes fails
- Band of middle-frequency channels HOT 2
- Add some documentation HOT 3
- SAT beam widths HOT 8
- Sampling frequency HOT 2
- Number of detectors per tube HOT 18
- Use "C" in Chilean band names and "P" in South Pole band names HOT 1
- Noise correlation factor
- CHLAT and SPLAT MF/LF and HF wafers still have different clocking
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