LAST CHANGED    : Mon Dec 20 08:22:16 HST 2004
SHIP NAME       : Melville
CRUISE          : P2_leg1 (mv0407)
CRUISE DATES    : 2004/06/15 to 2004/07/25
PORTS           : Yokohama to Honolulu
CHIEF SCIENTIST : Paul E. Robbins, James Swift
DB_NAME         : a0407
DATA FILES      : VANC32MV*_000000.LTA [1-33]
STATUS          : done processing LTA data; heading is corrected,
                        edited, calibration applied


INSTRUMENT      : OS75

ACQUISITION
     PROGRAM    : VmDAS

     PING TYPE  : broadband + bottom track
     PARAMS     : see COMMENTS

HEADING
     PRIMARY    : gyro
     CORRECTION : POSMV

POSITIONS       : gps receiver

CALIBRATION     : final angle of transducers relative to ashtech:
                   transducer orientation  + 3.62 + (-2.14)
                  = 45 + 1.48

COMMENTS        :
  (1) something is a little strange in the middle for a short time:
          stripes in u (only) exist at on-off station transitions .
          Not all were edited out.
  (2) data mostly collected with 80 bins 8mBB+BT
      except 2 files with 80m NB16 only
  (3) not much ringing at all compared to second half of cruise
  (4) data coverage affected by weather conditions (more than leg 2 nb16)
  (5) some possible underway bias in bb (edited out).
      Can possibly correct that with single-ping processing later
      to resurrect a small fraction of the data


-------------------------------------------------------------

os75; rotate by 3.62 deg

fix gyro:
(1) use NB150 heading correction for os75

rotate rotate1.tmp

quick_adcp.py --yearbase 2004 --use_refsm --steps2rerun navsteps:calib --auto

Number of edited points: 180 out of 201
   amp   = 1.0049  + -0.0000 (t - 186.6)
   phase =  -2.15  + 0.0004 (t - 186.6)
            median     mean      std
amplitude   1.0050   1.0049   0.0061
phase      -2.1270  -2.1457   0.3652


(2) rerotate:

quick_adcp.py --yearbase 2004 --use_refsm --steps2rerun rotate:navsteps:calib\
   --auto --rotate_angle -2.14


Number of edited points: 180 out of 201
   amp   = 1.0048  + -0.0000 (t - 186.6)
   phase =  -0.01  + 0.0004 (t - 186.6)
            median     mean      std
amplitude   1.0050   1.0048   0.0061
phase       0.0115  -0.0052   0.3652


(3) edit; apply editing

quick_adcp.py --yearbase 2004 --use_refsm --steps2rerun apply_edit:navsteps:calib   --auto


Number of edited points: 178 out of 200
   amp   = 1.0046  + 0.0000 (t - 186.5)
   phase =  -0.02  + 0.0024 (t - 186.5)
            median     mean      std
amplitude   1.0050   1.0046   0.0062
phase       0.0115  -0.0171   0.3851


----------------------

final angle of transducers relative to ashtech:
transducer orientation  + 3.62 + (-2.14)
= 45 + 3.62 + (-2.14)


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