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Structural Temperatures Analysis and Results

Data

The data are stored in /home/groups/ptcs/data/AntennaCharacterizationSpring2004. The filenames begin with the project id name (e.g., TPTCSRMP030824). There are several different types of files.

"projid".dat        - Pointing/focus data set.
                      ((Az,El) LPCs are differential; Y focus is absolute.)
"projid"_tp.dat     - Explicitly total power data.
"projid"_sp.dat     - Explicitly beam switched power data.
"projid"ENC.dat     - Pointing/focus data set.
                     ((Az,El) LPCs are absolute; Y focus is absolute.)
"projid"FIXED.dat   - Uses a fixed format with no comma separations.
"projid"_qf.dat     - Auxillary table that contains a Quality Factor.

• Project TPTCSRMP030824: Scans [401:722]; No sub-reflector Temp!

Scans 425,428,563: bad fits with nan values. (RFI for scan 425.)
Scans 706,707: the sampling looks odd; large LPCs.

• Project TPTCSRMP030905: Scans [26:1128]

Scan 1007: Maybe some problems with Antenna FITS file.
Scans 854,941,963: Problems with Gaussian fit.
Scans 840,960: Focus scans.
Scan 843: Az peak outlier.

• Project TPTCSRMP030911: Scans [10:59,82:11,115:193,220:229,289:958,971:1027]

Many scans deleted because of archivist problems.
Some RFI during the end of the run (delete scans 1028:1089).
Scans 71,753: bad fits with nan values for sigmaValue.

• Project TPTCSDSB030923: Scans [1:141, 159:173, 194:208, 259:1127]

Some scans deleted at the start because of archivist/temperature monitor problems.
Some scans deleted because of problems with antenna FITS file (nan's). 
Scans 153,984: bad fits with nan values for sigmaValue.

• Project TPTCSDSB031002: Scans [23:62, 63:132 (only RCP), 133:1039]

Scans [63:130] drop outs on rcvr1 (LCP)
Some scans after 130 did have dropouts.

• Project TPTCSRMP031108: Scans [1:192 (only LCP)]

K-band data set using the lower band (18-22 GHZ); Freq = 20 GHz.
Calibration used: 
  Tsig_cal=5.8 K  (feed 1, LCP)
  Tref_cal=5.9 K  (feed 2, LCP)
Only LCP data were good.
Both total power and switched power data were processed.

• Project TPTCSRMP031110: scans [1:188]

Few scans could not get DCR FITS file
Few scans failed fit criteria

• Project TPTCSDSB031110: scans [5:784]; new antenna manager

Few scans failed fit criteria (e.g., bad baselines, RFI, etc.)

• Project TPTCSRMP031120: scans [97:632]; mostly nighttime data

High quality data; only one focus scan rejected due to RFI.

• Project TPTCSRMP031229: scans [5:588]; dynamic corrections applied during the run but not included in analysis.

Several scans rejected; otherwise okay.

Data Formats

The structural temperatures and astronomical results are contained in a "comma separated variable" ASCII text file. This format can be read by most programs, is convenient for Unix applications, and is human readable.

Fixed-column-width files are also now available with the name 'projectidFIXED.dat' or projectid_qfFIXED.dat'. The python format string used to write these files (note the extra space between each column) is:

data files:

'%16s %8s %4s %6i %20.12f %12.8f %12.8f %12.8f %12.8f 12.8f %12.8f %8.3f %8.3f %8.3f' 
then N times '%8.3f '

quality flag files:

'%16s %8s %4s %6i %20.12f %4s'

The data are collated on a per-scan (not per-observation) basis. An obseration can consist of a Peak (containing forward and backward Az and El scans), a Focus (containing forward and backward Y subreflector scans), and a Track. The following table lists the current format.

Here is the format for the table that assigns a quality factor to the data.

-- RichardPrestage - 06 Sep 2003