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The Pulsar has a period of 5.540s with a pulse width of 65ms. It's shape is estimated to be a step function in Fourier analysis, showing that the 2nd, 3rd, 4th, and 5th harmonic peaks respectively have 99.9%, 99.8%, 99.7%, and 99.5% the amplitude of the fundamental peak in frequency.

Plots

The following plots are produced from timestreams which had PCA analysis applied to them. The bolometers [ 317 315 314 313 311 304 303 294 293 143 140 139 138 137 133 132 131 127 126 122 103 102 93 85 78 49 47 46 38 37 29 ] used for the PCA (31 bolometers in total) were handpicked. They were chosen based on proximity to the reference bolometer(102), low noise, and sky response.

• 1E500B.pdf: 1 Eigenmode removed using PCA. FFT calculated using 500 bins
• 1E750B.pdf: 1 Eigenmode removed using PCA. FFT calculated using 750 bins
• 2E500B.pdf: 2 Eigenmodes removed using PCA. FFT calculated using 500 bins
• 2E750B.pdf: 2 Eigenmodes removed using PCA. FFT calculated using 750 bins
• 2E1500B.pdf: 2 Eigenmodes removed using PCA. FFT calculated using 1500 bins
• 3E500B.pdf: 3 Eigenmodes removed using PCA. FFT calculated using 500 bins
• 3E750B.pdf: 3 Eigenmodes removed using PCA. FFT calculated using 750 bins
• 3E1500B.pdf: 3 Eigenmodes removed using PCA. FFT calculated using 1500 bins
• 4E500B.pdf: 4 Eigenmodes removed using PCA. FFT calculated using 500 bins
• 4E750B.pdf: 4 Eigenmodes removed using PCA. FFT calculated using 750 bins
• 4E1500B.pdf: 4 Eigenmodes removed using PCA. FFT calculated using 1500 bins

• psd_with_noise.pdf: psd and s/n for pulsar data. Scans 6425:6427 were read in individually with szd_readscans. 5 eigenmodes were removed using pca then thier psd was individually calculated using psd_from_ts. The resulting psd's were averaged together. The noise was estimated by removing 5 PCA eigenmodes from the full 6425:6427 szd structure, then finding the psd. The resulting data was fit to the psd using psd_fit, then calculate_spectrum.

Calibration and Flagging

For Flagging routines which will automatically pick good bolos for the PCA analysis require calibration information. The Mars scans 6421 and 6440 ideal choices for calibration since they were taken around the time of the Pulsar data collection. When sourcecal is run with the scan 6421 an error occurs:

[choose_logfile] Found log file with scan number: ??? Too many outputs requested.  Most likely cause is missing [] around
left hand side that has a comma separated list expansion.

Error in ==> choose_logfile at 58
filename = log_files(indx).name;

Error in ==> read_ascii_monitor at 82
   logf = choose_logfile(szd.scan.num, obslogdir);

Error in ==> szd_frommbfits at 94
   szd = read_ascii_monitor(szd, datadir, asciimondir);

Error in ==> szd_readscans at 91
   szd = szd_frommbfits(scandir);

Error in ==> sourcecal at 45
szdcal = szd_readscans(scannum,datadir,'parse_halfscans');

-- JamesKennedy - 06 Jul 2007

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This topic: APEX_SZ > WebHome > PulsarData Topic revision: r6 - 2007-07-13 - JamesKennedy

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