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operations:documentation:fivept_output [2013/02/20 01:17] Jim Lovell created |
operations:documentation:fivept_output [2013/02/20 01:54] (current) Jim Lovell |
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2013.043.22:32:32.50#fivpt#lat 8 81148. 0.2301 0.014 0.054 | 2013.043.22:32:32.50#fivpt#lat 8 81148. 0.2301 0.014 0.054 | ||
2013.043.22:32:46.50#fivpt#lat 9 81162. 0.3151 -0.151 0.048 | 2013.043.22:32:46.50#fivpt#lat 9 81162. 0.3151 -0.151 0.048 | ||
+ | </code> | ||
+ | |||
+ | Where: | ||
+ | * N is the point number | ||
+ | * Time is the time tag (in seconds) | ||
+ | * Offset is the pointing offset from nominal (in deg) | ||
+ | * Amp is the amplitude of the measurmenent | ||
+ | * Err is an estimate of the error in the measured amplitude | ||
+ | |||
+ | <code> | ||
Offset Width Amp C M E_code | Offset Width Amp C M E_code | ||
2013.043.22:32:46.50#fivpt#latfit -0.04835 0.2266 1.0818 0.2310 -0.0065 4 | 2013.043.22:32:46.50#fivpt#latfit -0.04835 0.2266 1.0818 0.2310 -0.0065 4 | ||
2013.043.22:32:46.50#fivpt#laterr 0.00792 0.0221 0.0778 0.0473 0.0008 0.0810 | 2013.043.22:32:46.50#fivpt#laterr 0.00792 0.0221 0.0778 0.0473 0.0008 0.0810 | ||
</code> | </code> | ||
+ | |||
+ | Where the ''latfit'' and ''laterr'' lines refer to the fitted paramaters and their errors respectively. | ||
+ | * Offset is pointing offset in deg | ||
+ | * Width is the width of the gaussian (deg) | ||
+ | * Amp is the amplitude of the fitted Gaussian | ||
+ | * C and M are the y-intercept and slope of the linear fit | ||
+ | * E_code in ''latfit'' indicates the success (or not) of the fit. //A negative number means the fit was unsuccessful// a positive number (I think) is the number of iterations before a fit was achieved. | ||
+ | |||
+ | The Longitude (Azimuth) scan is done next and the output is similar: | ||
+ | <code> | ||
+ | 2013.043.22:38:17.53#fivpt#lon 1 81493. -0.3417 0.803 0.049 | ||
+ | 2013.043.22:38:31.54#fivpt#lon 2 81507. -0.2563 0.991 0.072 | ||
+ | 2013.043.22:38:45.50#fivpt#lon 3 81521. -0.1709 0.885 0.064 | ||
+ | 2013.043.22:38:59.46#fivpt#lon 4 81535. -0.0854 1.278 0.052 | ||
+ | 2013.043.22:39:13.46#fivpt#lon 5 81549. 0.0000 1.441 0.078 | ||
+ | 2013.043.22:39:27.49#fivpt#lon 6 81563. 0.0854 1.286 0.061 | ||
+ | 2013.043.22:39:41.46#fivpt#lon 7 81577. 0.1709 0.925 0.068 | ||
+ | 2013.043.22:39:55.50#fivpt#lon 8 81591. 0.2563 0.975 0.128 | ||
+ | 2013.043.22:40:09.51#fivpt#lon 9 81605. 0.3417 0.999 0.078 | ||
+ | 2013.043.22:40:09.51#fivpt#lonfit -0.00320 0.1878 0.5616 0.9179 0.0010 7 | ||
+ | 2013.043.22:40:09.51#fivpt#lonerr 0.01488 0.0384 0.0907 0.0447 0.0009 0.0899 | ||
+ | </code> | ||
+ | Note that the fit is done in Azimuth not cross-elevation so the pointing offset and width of the Gaussian should be scaled by cos(El) to get an offset in degrees on the sky. This is calculated for you and displayed next: | ||
+ | |||
+ | <code> | ||
+ | Az El Lon_offs Lat_offs | ||
+ | 2013.043.22:40:13.21#fivpt#offset 210.7833 5.4745 -0.00320 0.02518 1 1 | ||
+ | 2013.043.22:40:13.21#fivpt#xoffset 210.7833 5.4745 -0.00319 0.02518 0.01481 0.00850 1 1 | ||
+ | </code> | ||
+ | |||
+ | Where ''offset'' shows the offsets in antenna coordinates (Az and El) and ''xoffset'' in sky coordiantes (i.e. Az x cos(El)). It's the ''xoffset'' values that we want to look at. In the above, ''Az'' and ''El'' are the Azimuth and Elevation that the fit was done, ''Lon_offset'' is the cross-El pointing offset in deg and ''Lat_offs'' is the Elevation pointing offset in deg. | ||