
METADATA FOR LMG SHIPBOARD ADCP

#DATA_DATES: 2001/03/19 06:06:00 --- to --- 2001/04/13 01:25:00
#LAT_RANGE: 68.33 W --- to --- 52.50 W
#LON_RANGE: 74.18 S --- to --- 58.71 S
#DEPTH_RANGE: : 26 --- to --- 498 m
#PLATFORM_NAME: R/V Laurence M. Gould
#PRINCIPAL_INVESTIGATOR_NAME: Dr. Teresa K. Chereskin
#PI_INSTITUTION: Scripps Institution of Oceanography
#PI_COUNTRY: USA
#PROJECT: Shipboard Acoustic Doppler Current Profiling on R/V LMG
#CRUISE_NAME:
#PORTS: Punta Arenas to Palmer Station, to Punta Arenas
#GEOGRAPHIC_REGION: Southern Ocean
#PROCESSED_BY: Scripps Institution of Oceanography
#NAVIGATION: GPS
#QUALITY_NAV: good
#GENERAL_INFORMATION:
CRUISE NOTES
    CHIEF SCIENTIST ON SHIP      : Robert Beardsley, Laurence Padman, John Hildebrand, Brenda Hall
      INSTITUTE                  : 
      COUNTRY                    : 
   SIGNIFICANT DATA GAPS         :
   SPECIAL SHIP TRACK PATTERNS   :
   COMMENTS                      :

ADCP INSTRUMENTATION
     MANUFACTURER                : RDI
     HARDWARE MODEL              : VM-150
     SERIAL NUMBERS              : transducer SN 536; chassis SN 631
     FIRMWARE VERSION            : 17.12 (but reported as 17.10)
    <the following 5 fields are specific to a given hardware model>
     TRANSMIT FREQUENCY          : 153.6 kHz
     TRANSDUCER CONFIGURATION    : JANUS CONCAVE
     ACOUSTIC BEAM WIDTH         :
     TRANSDUCER BEAM ANGLE       : 30 deg.
     COMMENTS                    :

ADCP INSTALLATION
     METHOD/DESCRIPTION OF THE
       ATTACHMENT TO THE HULL    : The ADCP transducer is installed in the forward,
                                   starboard well, accessed from the bow thruster room.
                                   The sonar well is approx. 28x28x25 inches (lxwxh).
                                   The acoustic window installed at the bottom of the well is
                                   17x17x2 inches and made of polyurethane.
                                   The ADCP transducer is bolted to a steel mounting
                                   plate that is secured to 4 tabs, one welded to each
                                   wall of the well. Eight bolts are used to secure
                                   the transducer to the plate, and eight bolts are used
                                   to secure the plate to the tabs (2 per tab). All 4
                                   sonar wells on the LMG are in a pod that is
                                   protected by an "ice knife". The ice knife
                                   deflects ice and bubbles away from the pod. The orientation
                                   of the transducer is beam 3 points 45 degrees to the starboard
                                   side of forward.
     LOCATION/DEPTH ON HULL      : nominally at 6 m
     REPEATABLE ATTACHMENT       : The ADCP mounting fixture allows a small amount of
                                   variation in transducer orientation relative to the ship.
                                   Once the bolts are secure, the orientation does not change.
                                   The maximum variation between installations is estimated at 2
                                   degrees. There is a procedure in place to produce a repeatable
                                   installation. When it is followed, the procedure produces
                                   an installation repeatable to better than 1 degree.
     DATE OF MOST RECENT ATTACH. : August 1999 (Note: LMG shipyard periods are normally during the
                                   month of August. While we do not always know whether the
                                   transducer installation changed during a shipyard period, August
                                   1999 was the initial installation on the LMG.)
     ACOUSTIC WINDOW             : YES
     COMMENTS                    : The transducer is mounted in a well behind a
                                   polyurethane window. The well is filled with
                                   a mixture of ethylene glycol and water.

ADCP INSTRUMENT CONFIGURATION
<these are normally documented automatically and are part of Codas database>
     DEPTH RANGE                 :
     BIN LENGTH                  :
     NUMBER OF BINS              :
     TRANSMIT PULSE LENGTH       :
     BLANKING INTERVAL           :
     ENSEMBLE AVERAGING INTERVAL :
     SOUND SPEED CALCULATION     : FUNCTION OF TEMP AT TRANSDUCER
     BOTTOM TRACKING             : 
     DIRECT COMMANDS             : FH00001, B009001, E0004020099, CF63
     COMMENTS                    :
     COMMENTS                    : (output from CODAS lst_conf.cnt)
          
           Configuration History File 
          
          Columns are as follows: 
          
           B : CODAS logical block number  
          
          BT : bottom track mode (on or off)  
          
          SI : sampling interval or averaging period for ensemble (sec)
          NB : number of bins
          
          BL : bin length (m)
          PL : pulse length (m)
          TD : transducer depth (m)
          BK : blanking length (m)
          
          TR : top reference bin (m)
          BR : bottom reference bin (m)
          
          HO : heading offset applied by DAS (deg)
          HB : heading bias (deg)
          CRPH : compensation for roll-pitch-heading, 1:on, 0:off)
          
          yy/mm/dd  hh:mm:ss   B    BT    SI  NB   BL PL TD BK   TR BR       HO     HB CRPH
          2001/03/19  06:06:57   0    on   300  60    8 16  6  8    3 10    45.00   0.00 0001  
          2001/03/20  04:35:39   2   off   300  60    8 16  6  8    3 10    45.00   0.00 0001  
          2001/03/22  13:25:26   7    on   300  60    8 16  6  8    3 10    45.00   0.00 0001  
          2001/03/22  21:42:33   9    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/23  14:45:58  11   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/24  19:06:25  14    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/26  11:19:37  17   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/26  11:35:12  18    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/27  12:15:13  21   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/27  20:29:23  22    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/27  23:35:09  23   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/28  00:25:52  24    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/28  14:11:50  26   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/28  16:12:51  27    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/28  21:30:49  29   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/29  12:06:43  31    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/29  14:57:15  32   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/29  23:22:53  33    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/30  22:34:10  36   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/31  12:24:32  38    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/03/31  18:44:29  39   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/04/01  15:41:55  41    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/04/01  16:25:18  42   off   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/04/02  14:48:13  45    on   300  50    8 16  6  8    3  5    45.00   0.00 0001  
          2001/04/08  13:08:24  55    on   300  60    8 16  6  8    3 10    45.00   0.00 0001  
          2001/04/10  01:17:27  58   off   300  60    8 16  6  8    3 10    45.00   0.00 0001  
          2001/04/12  06:09:55  63    on   300  60    8 16  6  8    3 10    45.00   0.00 0001  

ADCP DATA ACQUISITION SYSTEM
     SOFTWARE DEVELOPERS         : RDI/UH
     SOFTWARE VERSIONS           : DAS248 and UE4
     DATA LOGGER, MAKE/MODEL     : 200 MHz Pentium clone
     ADCP/LOGGER COMMUNICATION   : GPIB
     USER BUFFER VERSION         : 1920
     CLOCK                       : PC clock, reset by UE4 if drift > 2 sec from GPS.
     COMMENTS                    :

SHIP HEADING
     INSTRUMENT MAKE/MODEL       : gyrocompass, NMEA heading supplied to the DAS pc
     SYNCHRO OR STEPPER          :
     SYNCHRO RATIO               :
     COMPENSATION APPLIED        : yes
     GPS ATTITUDE SYSTEM         : YES, Ashtech ADU2 GPS
        LOCATION OF ANTENNAS     : main mast
        RIGID ATTACHMENT         : YES
        LOGGING RATE             : 1 Hz

ANCILLARY MEASUREMENTS
    SURFACE TEMP AND SALINITY    : thermosalinograph, when available
    PITCH/ROLL MEASUREMENTS      : yes
    HYDRO CAST MEASUREMENTS      :
    BIOMASS DETERMINATION        :
       DATE OF LAST CALIBRATION  :
       CALIBRATION COEFFICIENTS  :
       BEAM-AVERAGED AGC AVAILABLE?: YES
       CALIBRATION NET TOWS?     :    NO
    COMMENTS                     :

NAVIGATION
    TRANSIT                      :
       MAKE/MODEL                :
       LOGGED WITH ADCP DATA     :
       COMMENTS                  :
    GPS                          :
       MAKE/MODEL                :
       SELECTIVE AVAILABILITY    :
       P-CODE                    : YES
       DIFFERENTIAL              :
       SAMPLE INTERVAL           : 1 Hz
       LOCATION OF ANTENNA
         RELATIVE TO TRANSDUCER  :
       TIME OBTAINED RELATIVE TO
         START/END OF ENSEMBLE   : 2 fixes at start and end. 2 from P-code and 2 from Ashtech
       AVERAGING/EDITING APPLIED :
       LOGGED WITH ADCP DATA     :  YES - via UE4, UB type 1920
       LOGGED INDEPENDENTLY      :
       COMMENTS                  :
    OTHER                        :

ADCP DATA PROCESSING/EDITING
     PERSONNEL IN CHARGE         : Processor 1
     SOUND SPEED CORRECTIONS     :
     DATE OF PROCESSING          :
     NOTABLE SCATTERING LAYERS   :
     COMMENTS                    :

CALIBRATION
     GYROCOMPASS CORRECTION      : Ashtech corrections to Gyro used.

     BOTTOM TRACK METHOD         :
          ADCP lg0103 step size 2
             Time range  77.25 to 102.06
             Calculation done at 2003- 5-22  14:57
              step: 2
              min_depth:  25   max_depth: 1500
              min_speed:  2.0 m/s   max_sig:  2.5 std devs
              max_gap:  0.10 minutes   tol_dt: 0.02 (fraction)
          unedited: 3293 points
          edited:   1867 points, 2.0 min speed, 2.5 max dev
                      median     mean      std
          amplitude   0.9728   0.9720   0.0109
          phase      -0.2475  -0.2216   0.6276
          

     WATER TRACK METHOD          :
          ADCP lg0103 7ens
             Time range  80.42 to  98.58
             Calculation done at 2003- 5-22  14:56
             delta-u min = -100.00, max = 100.00;
             delta-v min = -100.00, max = 100.00
             clip_amp = 0.04,  clip_ph =  3.0
             clip_dt =   60,  clip_var = 0.050
          Number of edited points:  79 out of  95
             amp   = 0.9762  + -0.0001 (t -  89.4)
             phase =  -0.31  + 0.0262 (t -  89.4)
                      median     mean      std
          amplitude   0.9750   0.9762   0.0130
          phase      -0.3330  -0.3106   0.8209
          nav - pc    3.0000   3.5443   3.8723
          var         0.0090   0.0115   0.0084
          min var     0.0080   0.0096   0.0067
          delta-u     1.4800   0.4510   3.9442
          delta-v     0.2100   0.1677   3.5402
          
     FINAL SELECTION             : AMPLITUDE= -0.98      PHASE= -0.3

     AGREEMENT WITH PREVIOUS
       CRUISES                   :
     COMMENTS                    : In August 2000, a sound velocity probe (SVP)
                                   was installed in the transducer well.
                                   When available, SVP data are used to correct
                                   sound speed at the transducer. A linear least
                                   squares regression of sound speed from the SVP
                                   versus transducer temperature from the ADCP
                                   is computed.  ss_corrected = b + m * tr_temp
                                   b = 2.88               m = 1516.95

NAVIGATION CALCULATION
     NAVIGATION USED             : GPS
     REFERENCE LAYER DEPTH RANGE : 4 to 12, PG_MIN = 50
     FILTERING METHOD FOR
       SMOOTHING REFERENCE LAYER
       VELOCITY (FORM/WIDTH)     : Blackman window function of width = 0.0208 days (half hour)
     FINALIZED SHIP VEL/POSITIONS
       STORED IN DATABASE        : YES
     COMMENTS                    :

QUALITY ASSESSMENT
     ON-STATION VS. UNDERWAY     :
     VECTOR, CONTOUR, STICK PLOTS: YES, OK
     COMMENTS                    :

REFERENCES (DATA REPORTS,ETC)   :


