Differences
This shows you the differences between two versions of the page.
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projects:mkat_sband:pub:snrdet [2020/11/03 08:38] wucknitz |
projects:mkat_sband:pub:snrdet [2020/11/04 11:13] (current) wucknitz |
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| | 3 | symmetric diff in time | from difference to mean of both adjacent time bins | | | 3 | symmetric diff in time | from difference to mean of both adjacent time bins | | ||
| | 4 | symmetric diff in freq | from difference to mean of both adjacent channels | | | 4 | symmetric diff in freq | from difference to mean of both adjacent channels | | ||
| - | | 5 | weights | from ''WEIGHT_SPECTRUM'', which is probably derived from autocorrelations | | + | | 5 | weights | from ''WEIGHT_SPECTRUM'', derived from autocorrelations, dt*df/(auto1*auto2) | |
| | 6 | rms2 | rms deviation from frequency-average (per time and pol) | | | 6 | rms2 | rms deviation from frequency-average (per time and pol) | | ||
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| {{:projects:mkat_sband:pub:snr_1sec.png?direct&400}} | {{:projects:mkat_sband:pub:snr_1sec.png?direct&400}} | ||
| - | Particularly in the 60-sec solution we find that the "rms" method does not work well. For 10-sec and 1-sec, everything gets closer together. In these cases the "diff in freq" and "symmetric diff in freq" methods are both very good and almost indistinguishable. For the future we will generaly use "symmetric diff in freq", unless noted otherwise. | + | Particularly in the 60-sec solution we find that the "rms" method does not work well. For 10-sec and 1-sec, everything gets closer together. In these cases the "diff in freq" and "symmetric diff in freq" methods are both very good and almost indistinguishable. For the future we will generaly use "symmetric diff in freq" with 1-sec solution intervals, unless noted otherwise. |
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| {{:projects:mkat_sband:pub:sefd_1sec.png?direct&500}} | {{:projects:mkat_sband:pub:sefd_1sec.png?direct&500}} | ||
| - | The SNR can be | + | The SNR can be reduced or separated into station-based SNRs, as shown with the dashed yellow lines. These can hardly be distinguished from the solid (baseline-based) lines, which proves that the separation works well. |
