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-This program is used to analyse pulsars of known parameters.  It contains
-  both a post-detector spectral display, and a "pulse profile" display.
-  It has a built-in de-dispersion filter that will work up to DM=100 for
-  21cm observing, and up to DM=5 for 327Mhz observing.
-
-The program takes the following options:
-
-  --rx-subdev-spec     which USRP Rx side?  A or B
-
-  --decim              USRP decimation rate use either 64 or 128
-
-  --freq               USRP daughtercard frequency
-
-  --observing          Actual observing frequency (default is to use the
-                       setting for --freq)
-
-  --avg                Averaging setting for spectral display--higher numbers
-                       equal more averaging.  25 to 40 is typical.
-
-  --favg               Pulse folding averaging.  2 to 5 is typical.
-
-  --gain               USRP daughtercard gain control
-
-  --reflevel           Reference level on pulse profile display
-
-  --lowest             Lowest spectral bin that is considered valid, in Hz
-
-  --longitude          Observer longitude: West is negative
-
-  --latitude           Observer latitude:  South is negative
-
-  --fft_size           Size of FFT for post-detector spectrum: default is 1024
-
-  --threshold          Threshold (dB) to be considered a spectral "peak"
-                       This is relative to the average spectral level
-
-  --lowpass            Low pass frequency for post-detector spectral display
-                       20-100 is typical
-
-  --prefix             Filename prefix to use for recording files
-                       Default is ./
-
-  --pulsefreq          The frequency of the expected pulses
-                       For sentimental reasons, this defaults to 0.748Hz
-
-  --dm                 The DM
-
-  --doppler            The doppler shift, as a ratio
-
-  --divbase            The base of the Y/Div menu in pulsar display
-
-  --division           The initial Y/Div in pulsar display
-
-DM, Doppler, Gain, Frequency, and the averaging parameters can all be
-  changed using the GUI at runtime.
-
-If latitude and longitude are set correctly, and the system time is
-  correct, then the current LMST is displayed below the frequency
-  input, updated once per second.
-
-Moving the mouse in the post-detector spectrum display shows you that
-  point in the post-detector spectrum, both frequency and signal level.
-
-The post-detector spectrum is analysed, with results shown below
-  "Best freq".  It shows the spectral peaks, and computes their relationship.
-  It shows the harmonic compliance among the peaks, as well as the average
-  peak-to-peak distance.
-
-
-Here's a complete example for observing a pulsar with a frequency of
-  1.35Hz, at 431.5Mhz, using an IF of 10.7Mhz, and a DM of 12.431, using
-  1Mhz observing bandwidth:
-
-./usrp_psr_receiver.py --freq 10.7e6 --decim 64 --dm 12.431 --avg 35 \
-  --pulsefreq 1.35 --fft_size 2048 --lowest 1.00 --gain 75 --threshold 11.5 \
-  --observing 431.5e6 --reflevel 200 --division 100 --divbase 10 --favg 3 \
-  --lowpass 20 --longitude -76.02 --latitude 44.95
-
-Since the observed pulsar is at 1.35Hz, a lowpass cutoff for the
-  post-detector spectral display of 20Hz will be adequate.  We
-  tell the spectral analyser to use a threshold of 11.5dB above
-  average when analysing spectral data, and set the epoch folder
-  averager (pulse profile display) to use an average from 3 samples.
-  Notice that our actual USRP/Daughtercard frequency is 10.7Mhz, while
-  our observing frequency is 431.5Mhz--this is important in order for
-  the DM de-dispersion calculations to be correct. We also set our
-  latitude and longitude, so that logfiles and the LMST display
-  will have the correct LMST in them.
-
-The entire complex baseband can be recorded, if the "Recording baseband"
-  button is pressed.  Filenames are generated dynamically, and a header
-  file is produced giving observation parameters.  The baseband data are
-  recorded as octet pairs: one for I and one for Q.  Pressing the button again
-  turns off baseband recording.  This baseband is "raw", so it will
-  not have been de-dispersed.  The data rate will be whatever the
-  USRP was programmed to at the time (based on --decim).
-
-  The files are:  YYYYMMDDHHMM.pdat  and YYYYMMDDHHMM.phdr
-
-  The .phdr file contains ASCII header information describing the
-  contents of the .pdat file.
-
-Similarly the raw, pre-folded, band-limited post-detector "audio" data can be
-  recorded using the "Record Pulses" button.  The data rate for these is
-  currently 20Khz, recorded as short integers.  Just like baseband recording,
-  pressing the button again turns off pulse recording.
-
-  The files are: YYYYMMDDHHMM.padat  and YYMMDDHHMM.pahdr
-
-  The .pahdr file is ascii text providing information about the contents
-  of the corresponding .padat file.