Table of Contents
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INTRODUCTION............................................................................... 2
General .............................................................................................................2
Specifications ....................................................................................................4
INSTALLATION................................................................................ 5
System Components .........................................................................................5
Power Supply Considerations ...........................................................................6
Transducer Installation ......................................................................................7
SPU Connections ..............................................................................................9
CONTROLS AND INDICATORS .................................................... 11
SPU.................................................................................................................11
LCDU ..............................................................................................................11
Startup Screen ................................................................................................12
File ..................................................................................................................13
Display ............................................................................................................13
Setup...............................................................................................................14
Gain.................................................................................................................15
Digitizer Settings .............................................................................................16
Help.................................................................................................................16
Control Panel...................................................................................................17
OPERATION................................................................................... 20
Power-Up Procedure.......................................................................................20
Example Survey System Configuration ...........................................................21
HYPACK ......................................................................................................21
ECHOSCAN Setup ......................................................................................21
HYSWEEP...................................................................................................25
Non-Standard System Configurations .............................................................26
COMMUNICATION CPU - Dip Switch Settings ............................ 29
MULTIBEAM CALIBRATION ......................................................... 31
Bar Check .......................................................................................................31
Referencing to a Single Beam Echo Sounder .................................................31
Combined Velocimeter and Single Beam Calibration......................................31
Flux Gate Compass Alignment........................................................................33
COMPUTER INTERFACE .............................................................. 34
Serial Output Strings .......................................................................................34
ECHOSCAN Output Simulators ......................................................................35
Side Scan Recorder / Processor Interfacing ...................................................36
EXTENDER CABLE WIRING ......................................................... 38
TRANSDUCER CABLES................................................................ 39
JUNCTION BOX WIRING ............................................................... 42
HEADING SENSOR WIRING ......................................................... 44
04/26/02
TABLE OF CONTENTS
1
Revision 1.11
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Summary of Contents for Odom ECHOSCAN
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Page 1: Table Of Contents
Combined Velocimeter and Single Beam Calibration........31 Flux Gate Compass Alignment................33 COMPUTER INTERFACE .............. 34 Serial Output Strings ..................34 ECHOSCAN Output Simulators ..............35 Side Scan Recorder / Processor Interfacing ...........36 EXTENDER CABLE WIRING ............38 TRANSDUCER CABLES..............39 JUNCTION BOX WIRING ............... 42 HEADING SENSOR WIRING ............ -
Page 2: Introduction
Provisions for housing motion sensors and side scan elements are built right into the fairing. Also built into every ECHOSCAN transducer is a separate, single beam receiver that is used with a standard survey echo sounder, such as the Odom ECHOTRAC, for shallow water applications or to provide a hard copy of the vertical profile. - Page 3 .05° and automatically compensated. Side Scan elements, mounted along the bottom edge, are included in every ECHOSCAN transducer. Backscatter imagery from the common 2.5° PZT projector is received by the two, 0.7°...
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Page 4: Specifications
Specifications Technical Specifications for the Odom ECHOSCAN Multibeam are as follows: • Acoustic Frequency ………………... 200 kHz • Number of Beams ………………….. 30 (physically beam formed) • Transducer Receive Elements …… PVDF • Projector Configuration ……………. PZT, 256 element, curvilinear array •... -
Page 5: Installation
LCDU, and the Transducer), a full complement multibeam system requires, a heading sensor (compass), a positioning system (normally a GPS receiver), and a ship’s motion sensor. For ease of inter cabling, Odom supplies a Junction Box (See Figure 4) to route signals to various units and sensors. For Example: The ODMS-05 motion sensor is setup to receive GPS and compass information to assist and optimize operation while in turns. -
Page 6: Power Supply Considerations
Heave, Pitch, and Roll COMPASS Compass Heading Position (normally GPVTG & GPGGA strings) ECHOSCAN Multibeam Output String (see section 6.1) Trigger Signal to Side Scan Imaging System Side Scan Analog Signal (port side) Side Scan Analog Signal (starboard side) X & Y Position Plus Time... -
Page 7: Transducer Installation
Transducer Installation In the majority of cases, transducer mounting is the most critical part of an installation. It must be mounted securely at a position on the hull where it is safe and where it will produce the least amount of drag and cavitation at survey speeds. - Page 8 Inside dimensions of the pole must be no less than 2.5 inches to allow for passage of the cables. Further information on transducer mounts may be obtained from Odom. Hydraulically Operated Bow Mount...
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Page 9: Spu Connections
ECHOSCAN transducers are normally delivered with 50 feet (or 15 meters) of cable. Proper routing of cables should be a priority consideration when planning a new installation. - Page 10 Ground Provision for grounding the unit to ship’s hull Power Input 110 VAC (75 VA) supply, or, if specified, 24VDC Ext. Trig. Input Used to control the firing rate of the SPU when operating in conjunction with a single beam echo sounder Side Scan Trigger Output...
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Page 11: Controls And Indicators
CONTROLS AND INDICATORS There is a minimal amount of operator control necessary in the ECHOSCAN multibeam. These mostly involve gain settings and calibration aids. All controls and operator interfacing are accessed through the laptop computer (LCDU). Other than the Power On switch, there are no controls on the production model of the SPU. -
Page 12: Startup Screen
Startup Screen The ECHOSCAN control program is initiated by double clicking on the Multibeam icon (Start / Programs / MULTIBEAM). The screen shown in Figure 9 allows the operator to configure the communication port to the SPU and select the system units. -
Page 13: File
File Since there is no provision for saving data recalling configurations, only option under “File” is Exit. The program is terminated with a “double click” on Exit, a “double click” on the “X” in the upper right hand corner, or the “Alt x”... -
Page 14: Setup
Setup Under “Setup” menu, controls adjust system configurations such as communication ports, calibrations parameters, hardware settings, and display options. System accuracy performance may be optimized under “Setup”. The following table lists describes each of the Figure 12 Setup submenu Setup Menu options. -
Page 15: Gain
AGC On (Cntrl+O) / Off control (for technician use only - see Tech Manual) Blanking (Cntrl+B) Used to set a depth below the transducer to which received data will be rejected. Normally this feature is used to “blank out” noise in the upper water column caused by aeration from other vessels (See Figure 17). -
Page 16: Digitizer Settings
(See “Multibeam Calibration – Bar Check”). Help At this time, the Help menu contains only very basic information about ECHOSCAN multibeam software. Future versions Multibeam Monitor will include this manual under the Help menu... -
Page 17: Control Panel
Control Panel Additional controls and indicators are positioned along the right side of the Multibeam Monitor screen as shown in Figure Some controls duplicated in the pull down menus. These functions are described in the following table: Figure 16 LCDU Control Panel 04/26/02 Revision 1.11... - Page 18 Control / Indicator Description Notes Gain Overall sensitivity If AGC is “ON” (in the “Setup” pull setting for all channels down menu), circuits will automatically adjust each individual channel gain about this “Gain” setting. Blanking Upper column noise Sets a depth below the rejection transducer in which noise, such as that caused by aeration, will...
- Page 19 Blanking aeration Figure 17 Blanking Feature 04/26/02 Revision 1.11...
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Page 20: Operation
2- In Windows / PROGRAMS, double click on the MULTIBEAM icon. 3- Ensure that the transducer is below the water surface (at least six inches). NOTE: ECHOSCAN will run with the transducer in the air but will output only null data. -
Page 21: Example Survey System Configuration
ECHOSCAN Setup 1- Under Initialization, select Devices / Add Device and type a name for the device such as ECHOSCAN (Do not press Enter). 2- Click on Library then Browse, locate the “echoscn2.dll” driver and click on OK. The box marked “Echo Sounder” should have an “X”. - Page 22 GPS Setup (assumes a Trimble receiver) 1- Reopen the Device Setup window by clicking on Devices and again on Add Device. Type in a name for the positioning system i.e. GPS (no Enter). 2- Click on Library then Browse and scroll to find the driver (for example;...
- Page 23 1- 21-Open HYPACK for Windows 6.4 / Preparation / Initialization and select I/O Test. Turn on all sensors including the ECHOSCAN. A window for each of the devices configured should appear. Click on a window to bring it forward and verify correct data input (consult software manuals if there is a question).
- Page 24 that parameters translations values correct postprocessing. Normally this is done automatically but it is a good idea to verify this. Open HYPACK for Windows 6.4 / Geodesy and check that each parameter is correct. For the next segment, the vessel should be moved to the work site or open water in order to establish start and end points for a test survey line.
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Page 25: Hysweep
recorded (as well as date, time, and heading) in the survey log for future reference. Other useful key combinations are: CNTRL I ……………. Selects the next line CNTRL D ……………. Selects the previous line CNTRL W ……………. Swaps beginning and end of line points NOTE: Newer versions of HYPACK are supplied with a “replay”... -
Page 26: Non-Standard System Configurations
For demonstration purposes, TerraModel is used because of its colorful Digital Terrain Models (DTM). Non-Standard System Configurations On rare occasions, it may be necessary to adjust ECHOSCAN to compensate for out-of-the-ordinary conditions. There are unusual situations where soft bottoms, at extreme depth ranges, will result in very weak receive signals -- especially if the bottom is sloped. - Page 27 There are several features and settings in the ECHOSCAN that may be effective in improving performance under these conditions. For more detailed descriptions of the receiver and transmitter circuits and bottom detection algorithms, refer to the ECHOSCAN Technical Manual.
- Page 28 It is recommended that adjustments to the “Bottom Tracking” performed only experienced ECHOSCAN system operators. Normal (default) settings are listed below. Refer to Table 4_1 for adjustment sequence and direction for various extreme bottom and water column conditions. Normal Settings: Gain …………………………………….……..
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Page 29: Communication Cpu - Dip Switch Settings
COMMUNICATION CPU - Dip Switch Settings The first four positions of SW1 on the Communications CPU board define the number of digitizer boards in the system. The list below describes the settings in binary format. Position 1 Communications CPU Number of Digitizer Boards Switch Positions 1=OFF, 2=ON, 3=ON,... - Page 30 Switch number 7 identifies the unit as part of a dual head system. Dual ECHOSCAN 7=OFF Single ECHOSCAN 7=ON Switch number 8 is activated (OFF position) when the ECHOSCAN is triggered externally as in the case when an ECHOTRAC single beam is used as the system controller. External Trigger 8=OFF...
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Page 31: Multibeam Calibration
(See Figure 18). Note: With the ECHOSCAN, it is not necessary to lower the bar directly beneath the transducer. It may be lowered on the opposite side of the vessel. The procedure for bar checking is the same with exception of the Channel # which must be set to monitor the proper beam. - Page 32 (k) is automatically compensated using this method. Level 2 Figure 18 ECHOSCAN CALIBRATION (Bi-Level Bar Check Method) 1. Lower the bar to a depth of 4 meters (or 10 feet) below the transducer. This will be Level 1.
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Page 33: Flux Gate Compass Alignment
Flux Gate Compass Alignment If a flux gate compass, such as the KVH is used, it may be necessary to experiment with different mounting locations in order to determine the optimum location. Ideally, the compass will function best when placed in an evenly distributed magnetic field. -
Page 34: Computer Interface
Table 7 ECHOSCAN Output String Format *1 The ECHOSCAN string contains 30, 16-bit ranges for a total of 80 bytes and a transmission time of 42 ms. Beam directions are in 3° increments, across Port (Beam 1) to Starboard (Beam 30). -
Page 35: Echoscan Output Simulators
ECHOSCAN Output Simulators There is a simple DOS program available on Odom’s Website which simulates the ECHOSCAN SPU output. It can be executed on a computer through one of the COM ports. Figure 19 Downloadable Simulators To download, access the Website “www.odomhydrographic.com” and select the “Technical Support Files”... -
Page 36: Side Scan Recorder / Processor Interfacing
WINDOWS “Programs” menu. Side Scan Recorder / Processor Interfacing Every ECHOSCAN transducer is equipped with a set of “true” side scan receive elements that receive acoustic backscatter information as echoed form the common 200 kHz projector. These signals are preamplified in the transducer and routed to a signal processor insider the SPU. - Page 37 ECHOSCAN analog side scan signals are compatible with all major side scan processing and recording devices i.e. Triton ISIS, OIC GEOdas, Oceanstar SeaSound, EPC, recorders, etc. For mode information consult the following web sites: http://www.tritonelics.com/ http”//www.oicinc.com/ http://www.marine-group.com/ http://www.epclabs.com/ 04/26/02 Revision 1.11...
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Page 38: Extender Cable Wiring
EXTENDER CABLE WIRING 04/26/02 Revision 1.11... -
Page 39: Transducer Cables
TRANSDUCER CABLES 04/26/02 Revision 1.11... - Page 40 04/26/02 Revision 1.11...
- Page 41 04/26/02 Revision 1.11...
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Page 42: Junction Box Wiring
JUNCTION BOX WIRING 04/26/02 Revision 1.11... - Page 43 04/26/02 Revision 1.11...
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Page 44: Heading Sensor Wiring
HEADING SENSOR WIRING 04/26/02 Revision 1.11...
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