OPERATION AND INSTALLATION MANUAL
Contents
1. Depth profile has Spikes Issue 2 Turbulence below transducer will cause spikes Does the problem occur more frequently at higher vessel speeds Turbulence below transducer will cause spikes Does it occur Oscilloscope more frequently at higher vessel speeds 5249 31 0014 Increase blanking period Remove spikes by adjusting VR8 on Analog PCB and measuring blanking period on TP10 SURVEY SYSTEM ONLY Remove spikes Increase blanking switch Page 26 of 30 Ignore the spikes there video or paper display is nothing to be done except let the shoal Sonavision Ltd Aberdeen Scotland Look at left LED Check None for dimming of intensity The left LED will dim if results are affected by speed This is a symptom of increased At high speed data seems to vary The vessel and RoxAnn survey can echosounder transducer be achieved at a larger mounting affect this range of speeds Improving grounding to reduce inherent noise in system will improve noise levels threshold The depth profile has The RoxAnn results None Ensure that all The depth profile is Holes may be off the scale of RoxAnn E1 and E2 continuous the set up of User Software Check E1 and E2 limits values will be accepted as valid data and coloured appropriately The depth profile has Check for spikes in Oscilloscope Filter out electrical noise The depth p2. Because RoxAnn is analysing very small changes in echo strength it is also important to attempt to keep the pulse width at a constant value for the duration of the survey If the pulse width is widened there will be a proportionate increase of mean transmitted power into the water and thus an increase in the relative strength of the return echoes Reference to the echosounder manual together with an approximate knowledge of the deepest area to be surveyed will help in choosing a suitable echosounder range to fulfil the above requirements for the duration of the survey Adjustments to the phasing of the echosounder display do not normally affect the characteristic of the transmit pulse Since RoxAnn also utilises the second echo return or double echo it is important that the depth range chosen for the echosounder allows RoxAnn to receive this second echo return before the next transmission This does not mean that the second echo has to be visible on the paper printout or CRT display only that the pulse rate frequency PRF is long enough to include this data Issue 2 5249 31 0014 15 of 30 Sonavision Ltd Aberdeen Scotland If this condition is not satisfied RoxAnn will stop processing until a suitable echosounder PRF is selected 4 6 Master Gain Switch SW3 This switch is situated on the back panel of the RoxAnn processor unit It s function is to adjust the overall gain or sensitivity of RoxAnn Other than it s limited
3. A parallel receiver which accepts the reflected echoes from the head amplifier and applies accurate signal processing especially of time varied gain and filtering Gating of the signal and integration of the first and second echoes is performed within this unit Optional RoxAnn interface box is a junction box which is fitted with connectors for easy connection of the head amplifier unit to Odom Simrad and Atlas Elektronik echosounders The dimensions of the RoxAnn hardware components are shown in Fig 4 and the maximum recommended cabling lengths are identified and specified in Fig 5 2 3 RoxAnn Software Interaction with RoxAnn is typically via RoxAnn compatible hydrographic or plotting software installed in the computer A considerable range of functions are available for the manipulation of numerical RoxAnn data RoxAnn compatibility is now a common feature of a number of proprietary software programs for navigational and hydrographic uses Sonavision supply a plotter package specifically designed to make the best of the RoxAnn data This package is called RoxMap 2 4 Echosounder RoxAnn can be supplied suitable for operation with virtually all known makes of echosounders Each RoxAnn unit will be supplied from the workshop to operate at the specific frequency indicated by the customer for the host echosounder 2 5 Positioning System and Computer Issue 2 5249 31 0014 Page 7 of 30 Sonavision Ltd Aberdeen Scotland
4. Issue 2 5249 31 0014 Page 9 of 30 Sonavision Ltd Aberdeen Scotland The unit does however require an initial calibration to adjust to the specific characteristics of the echosounder and its transducer This feature is operated by means of the RED button on the rear panel It is important that calibration is carried out over known seabed conditions in a specific range of water depths The type of seabed required for calibration of the system depends on the frequency of operation We recommend a sandy bottom in a water depth of 30 to 50 metres for low frequency systems and harbour mud at 4 to 5 metres depth for 200 kHz systems 3 3 2 Procedure Switch the GAIN CONTROL SW3 on the rear panel to position minimum gain Go to an area of seabed which is known to be as defined above for the actual system Press the RED button on the rear panel The effect of the calibration will depend upon the type of software displaying the Issue 2 5249 31 0014 10 of 30 Sonavision Ltd Aberdeen Scotland RoxAnn information If a precalibrated RoxAnn box is in use then readings on the display should now tie in with the type of seabed present If a precalibrated box is not available then the readings can be used to generate a box using ground truthing or sampling of some form 3 3 3 On Site Adjustments The above procedure achieves the optimum calibration for most work If it is found during site work that the crosses are
5. Sonavision Ltd Aberdeen Scotland MAINTENANCE AND WARRANTY POLICY Sonavision Limited warrants that its products are free from defects at the time of delivery and subject to the conditions listed below undertakes to repair or at its option replace any product found to be defective in material or workmanship within one year after delivery whichever is less to the original purchaser by Sonavision Limited or its authorised representative CONDITIONS Sonavision Limited must be immediately notified of any suspected defect and if advised by Sonavision Limited the equipment subject to defect shall be returned to Sonavision Limited freight prepaid This warranty does not cover defects which are caused as a result of improper usage repair maintenance alteration or installation unless such activities have been undertaken by Sonavision Limited or its authorised representative On completion of any warranty work Sonavision Limited will return the equipment freight prepaid Sonavision Limited retains the sole right to accept or reject any warranty claim SAFETY AND ENVIRONMENTAL STATEMENT Lethal voltages are exposed within the control unit when the top cover is removed The unit should always be disconnected from the mains supply before removing or operating any internal components The unit should be earthed at all times The unit contains electrostatically sensitive devices ESSD Appropriate static protection should be us
6. Specific system compatibility for the computer and positioning system will depend on the requirements and interface capabilities of the software program mentioned in Section 2 3 3 Installing RoxAnn Please check that there is no evidence of mishandling of your RoxAnn unit in transit or any indication of possible damage Before making any connections ensure that the echosounder and computer are switched off High voltages exist at the transducer terminals and may damage the equipment if it is live during the installation process Ensure that the RoxAnn head amplifier is the correct frequency for the echosounder selected Check the recommended cabling lengths in Fig 5 and make sure all cable runs are not more than the maximum specified Issue 2 5249 31 0014 Page 8 of 30 Sonavision Ltd Aberdeen Scotland 3 1 Connecting RoxAnn to the Transducer Note that there are three connections from the head amplifier to the echosounder a red and a yellow wire plus the screen connection The red and yellow wires are connected directly across the two transducer connections The red or yellow wire may be connected into either of the transducer connections as their polarity is not significant The RoxAnn screen is normally connected to the transducer screen ground When using the Optional Interface box for ODOM Simrad or ATLAS disconnect the echosounder transducer plug and connect to the appropriate socket on the interface box The flyin
7. are octal where 0000g 0 Volts 77778 4 095 Volts 5 2 RS232 Switch Settings For RoxAnn The settings for switch SW1 on the RS232 Board Rev 2 are detailed below This switch will be set during the build of the RoxAnn system and should not require to be altered Therefore before any of the settings are changed it is recommended that contact is made with Sonavision Switch Number Function Baud Rate Baud Rate Baud rate Protocol Protocol Range Range ND Baud Rate 3 1 9600 7200 Issue 2 5249 31 0014 Page 19 of 30 Sonavision Ltd Aberdeen Scotland 0 0 1 4800 1 1 0 3600 0 1 0 2400 1 0 0 1200 0 0 0 300 Protocol 4 5 Protocol 1 1 8 n 1 0 1 8 2 1 0 8 1 0 0 8 1 6 7 Frequency kHz 1 1 0 768 Extended 10 000m 0 1 7 68 Deep 2000m 1 0 76 8 Shallow 100m 0 0 7 68 Standard 1 000m Note that the output data string is modified for this range and uses a special version of RoxMap APPENDIX 1 LIST OF FIGURES The appendix contains technical specification for the RoxAnn unit and a full set of diagrams to facilitate installation The following lists the figures referred to in the text Figure 1 System Configuration Figure 2 System Configuration for ATLAS DESO range of echosounders Figure 3 RoxAnn Factory Set Up Record Figure 4 RoxAnn Hardware Components Dimensions Figure 5 RoxAnn Cabli
8. clustered in one area too close to either the top right or bottom left of the box for many different seabed types then the gain can be adjusted manually This will result in a loss of absolute calibration so it should be carried out with caution The manual gain control will move the area plotted for a specific seabed in a diagonal from the bottom left to top right of the screen approximately Increasing the gain will move the plots to the right Since the original calibration was carried out with a gain setting of zero the gain can only be increased if the RED button is again pressed If a gain reduction is required then the best way to proceed is to set the manual gain switch to a midrange position of 5 and then press the RED button again The manual gain control can now be adjusted up or down to place the plotted crosses in a suitable area of the RoxAnn box Remember however that absolute calibration will no longer be valid In some situations typically in bad weather the RoxAnn unit may recognise a fish shoal or aeration under the hull as a first seabed echo and therefore produce incorrect results The RoxAnn Survey Unit is provided with a range of plug in components which allow the blanking pulse to be extended to eliminate these false echoes in the water column See section 4 9 for further details Care must be taken to avoid blanking out the first seabed return since this will invalidate the RoxAnn data Issue 2 5249 31 0014 P
9. is good PCB Jumper J1 set calibration when when powered down gt 3 6vdc and check SW6 to UNCAL and powered down SW6 on Gimbal PCB is repeat calibration then set to UNCAL lock calibration when satisfied with setting See Installation Manual 3 6 Depth reading is out by Depth is created by None Consult Plotter Software Depth reading is factor of 10 outputting a specific number of clock cycles from RoxAnnTM Check that oscillator frequency setting in software matches frequency of unit supplied Instructions corrected Depth range is limited to 100m Issue 2 The oscillator frequency None in RoxAnn see Installation Manual Section 5 1 is set at 7 68 kHz 5249 31 0014 Add link on RS232 PCB Rev 0 amp 1 J1 or SW1 on Rev 2 Page 25 of 30 Depth range is 1000m Resolution is 0 1m Sonavision Ltd Aberdeen Scotland Depth profile has Spikes Depth profile has Spikes Fish shoals may cause spikes to appear at mid water Check for other acoustic Oscilloscope sources such as pingers sounders sonar These will appear to float through the RoxAnn signal on Analog PCB TP6 at regular intervals if viewed on oscilloscope Check echosounder for similar results pass Turn off all other Remove spikes equipment on board vessel If problem disappears turn on one by one to identify culprit Depth profile has Spikes
10. Aberdeen Scotland 1 Introduction Thank you for your commitment to RoxAnn a product of Sonavisions many years of experience in the design of hydro acoustic processing equipment This manual is designed to take you through the basic features of the RoxAnn unit and to demonstrate the installation process Once installed and calibrated the RoxAnn unit can be used as a fully automatic sensor of seabed data with minimal need for operational support RoxAnn can be effectively deployed in any situation where the nature of the seabed is being investigated It can be used to acquire precise seabed identification data for hydrography oil rig site surveying pipe and cable laying environmental surveys and for fisheries research Incorporation of calibration and noise balancing circuitry has simplified the installation procedure for RoxAnn You will be able to commission your RoxAnn unit tuned to your particular echo sounder by following the straightforward instructions outlined in the installation section Section 3 There is no requirement for specialised tools or skills only a short trip to waters of a specified depth in which to activate RoxAnn automatic calibration circuitry Section 3 5 Similarly for operational procedures our manual is brief and generally non technical There are no user adjustments particular to routine RoxAnn deployment Manipulation and display of RoxAnn data is by means of a RoxAnn specific plotter program R
11. Sonavision Ltd Aberdeen Scotland SONAVISION 2 OPERATION AND INSTALLATION MANUAL DETAILS OF THE EQUIPMENT PART NUMBER 5249 32 0001 DESCRIPTION ROXANN INSTALLATION MANUAL APPROVALS ORIGINATOR R J HARDIE ENGINEER PRODUCTION R J HARDIE Iss DATE DESCRIPTION BY CHK 0 DRAFT FOR APPROVAL 1 RELEASE FOR PRODUCTION 2 30 03 10 UPGRADE TO NEW DOCUMENTATION RH Issue 2 5249 31 0014 Page 1 of 30 Sonavision Ltd Aberdeen Scotland The latest issue of this document is held in electronic form This is available from our website www sonavision co uk COPYRIGHT SONAVISION LIMITED AUGUST 2008 The copyright in this document is the property of Sonavision Limited The document is supplied by Sonavision Limited on the express terms that it may not be copied used or disclosed to others except as authorised in writing by Sonavision Limited Sonavision Limited reserves the right to change modify and update designs and specifications as part of their ongoing product development programme TECHNICAL SUPPORT Sonavision Limited Unit 12 Energy Development Centre Aberdeen Science and Energy Address Park Bridge of Don Aberdeen AB23 8GD Scotland Telephone 44 0 1224 707737 Fax 44 0 1224 827290 Email info sonavision co uk Website www sonavision co uk Issue 2 5249 31 0014 Page 2 of 30
12. age 11 of 30 Sonavision Ltd Aberdeen Scotland 3 3 4 Long Term Calibration The gain setting achieved in the automatic calibration is stored in battery backed electronics The life of this battery is limited to approximately 6 months from the despatch date from the factory There is a facility to lock in the gain settings onto a DIL switch so that the settings will not be lost in time See section 3 5 in the manual for the procedure 3 4 Automatic Calibration Further Information The automatic calibration circuitry has been implemented in RoxAnn to facilitate installation and also to compensate for small differences in transducer characteristics The module which performs this function is the Gimbal PCB which is mounted on the Analogue PCB See Figs 11 and 13 When delivered from the factory SW6 on the Gimbal PCB is set to the UNCAL position This means that the automatic calibration circuitry is active Calibration may be performed at the recommended depth and over a suitable seabed type by one press of the red button CAL RECAL SW1 on the RoxAnn back panel See Fig 9 The master gain setting on the back panel SW3 is normally set to the 0 position at this time On activation the calibration circuitry automatically optimises the hardware for the existing installation This should only take a few seconds Correct operation of this function may be observed by the acquisition of accurate depth data on the sof
13. austive test and calibration procedure This ensures that installation of the system is as quick straightforward and trouble free as possible Normally no specialised equipment or knowledge is required just follow the instructions in the RoxAnn Installation Manual The LEDS are green lamps located on the front panel of the RoxAnn The left LED is on the left as viewed from the front of the unit The Blanking Switch Survey Unit Only Calibration button and Gain Switch are to be found on the rear panel of the RoxAnn system Issue 2 5249 31 0014 Page 22 of 30 Sonavision Ltd Aberdeen Scotland Trouble Shooting Guide SYSTEM CHECK EQUIPMENT ACTION RESULTS Both LEDS stay off Check power supply to Multimeter Ensure correct power LED s light up when the unit is RoxAnn is correct supply is received at switched on Check fuse at supply RoxAnn Check fuse on analog PCB LEDS are uneven Noise acoustic or None Connect equipment LEDS are of equal brightness or pulsing electrical is reaching per Fig 5 of Installation brightness noticeably RoxAnn Screen of Manual cable from HeadAmp is connected to screen of transducer cable Ground wires from RoxAnn Parallel Receiver and HeadAmp are connected to ship s earth Acoustic noise being generated by movement through water Issue 2 5249 31 0014 Page 23 of 30 Sonavision Ltd Aberdeen Scotland Both LEDS on but Is th
14. ch may be connected directly to a computer for data acquisition display 4 2 Parameters of RoxAnn Data Three parameters are supplied by RoxAnn to the data acquisition system computer E1 2 Issue 2 5249 31 0014 Page 13 of 30 Sonavision Ltd Aberdeen Scotland Depth data as two way pulse travel time E1 and E2 are independent DC voltage readings from 0 volts to a maximum of 4 095 Volts E1 information is a parameter giving data on the topographical roughness or texture of the material on the surface of the sea river bed E2 information is a parameter supplying data on the relative hardness or acoustic impedance of the seabed Depth data is given as a time in milliseconds being the time from the host echosounder transmission to the acquisition of the first return seabed echo This RoxAnn depth data is not intended to be used as a primary depth sensor but may be used as a backup to the primary echosounder depth digitiser 4 3 RoxAnn Square For display and analysis of E1 E2 data all RoxAnn compatible software programs include a mechanism referred to as the RoxAnn Square The Cartesian x y display of the RoxAnn Square has been found to be a most effective means of displaying a combination of two independent variables A single cursor moving in the square plotting field displays current E1 and E2 values The cursor on screen is easily understood and thus the use of the RoxAnn Square has greatl
15. e colour coding and analysis of data specific to any echosounder transducer configuration used with RoxAnn RoxAnn compatible software programs generally accept positional data in conjunction with RoxAnn values and are thus capable of charting RoxAnn colour coded seabed information By means of colour coding of tracks in underway surveying the charting of areas by RoxAnn parameters becomes fully automatic The colour coding of the RoxAnn values is a very powerful display function However RoxAnn data is invariably acquired and stored as raw E1 and E2 values and is suitable as reference data By a manipulation of the RoxAnn Square in post processing features of current interest can be highlighted and analyses performed to reveal significant traits or changes The variety of RoxAnn compatible software programs feature similar RoxAnn data handling functions They differ in their general application Sonavision can assist with your selection of computer hardware and software options appropriate to your own requirements 4 5 Operation with RoxAnn RoxAnn data sets are specific to the characteristics of the echosounder and transducer deployed Changes in the transmit signal from the echosounder will also require changes in the analysis of the RoxAnn data achieved It is therefore important to either maintain a consistent output power from the echosounder or to distinguish data sets by the echosounder power setting used
16. e vessel in deep Check reading in deeper Depth OK depth reading on enough water water RoxAnn Display Software is wrong Minimum depths below transducer are typically High Frequency 2 metre Low Frequency 7 metres Precise values vary depending on exact configuration Data is not being read The RS232 lead is None Look for data on COM Data string is being by computer plugged into the correct port by using a software received COM port package such as Terminal or Hyperterminal supplied with Windows Data is being received The software is set up to None Match the baud rate Data is read in as per by computer but is accept the RoxAnn parity number of data Installation Manual garbled data string format See and stop bits etc Section 5 2 Factory Setup Record and Installation Manual Section 5 2 Issue 2 5249 31 0014 Page 24 of 30 Sonavision Ltd Aberdeen Scotland When testing the RoxAnn with an echosounder on the work bench there is no output RoxAnn is designed None to stop outputting data when results are poor In air echosounders perform very poorly Place transducer in test tank or test in open water It may be necessary to increase the back panel gain Results may improve or RoxAnn will operate correctly RoxAnn does not Check battery on Voltmeter On gimbal PCB connect RoxAnn will retain retain its calibration Gimbal PCB
17. ed when handling subassemblies RELATED DOCUMENTS Document Number Document Title Issue 2 5249 31 0014 Page 3 of 30 Sonavision Ltd Aberdeen Scotland RoxAnn Installation Manual Survey Fishing Version RoxAnn is designed and manufactured by Sonavision Ltd of Aberdeen Scotland Sonavision reserves the right to alter the specification of the RoxAnn System and the manual will be updated accordingly RoxAnn has extensive patent protection which includes U S Patent numbers 4648081 amp 4777630 amp European and Asian Patents Sonavision Ltd 16 Denmore Industrial Estate Denmore Road Bridge of Don Aberdeen Scotland AB23 8JW Tel 44 0 1224 707737 Fax 44 0 1224 827290 Email info sonavision co uk Website www sonavision co uk Sonavision Ltd 2004 Issue 2 5249 31 0014 Page 4 of 30 Sonavision Ltd Aberdeen Scotland Contents Page 1 Introd ction Bai 6 2 System 6 1 System components 6 2 RoxAnn Hardware ns tend 6 3 RoxAnn SOM WAE eh Oet 7 4 ECHOSOUNAGR nnee ee 7 5 Positioning Systems and Computer 7 3 Installing ROXANNTM irn anakaa aia aaa 8 1 Connecting RoxAnn to the 8 2 Connection from RoxAnn System to Computer 9 3 Sys
18. eft LED will become If this lamp extinguishes completely a severe noise problem exists which must be corrected prior to data collection e g check grounding of equipment within the proximity of RoxAnn etc The LEDs are an excellent QC for RoxAnn A high degree of confidence is appropriate when both lamps are evenly illuminated Please pay particular attention to this QC facility when surveying at higher than normal vessel speeds and when RoxAnn is being deployed as portable equipment on vessels of convenience opportunity 4 9 Blanking of Midwater Echoes Issue 2 5249 31 0014 Page 16 of 30 Sonavision Ltd Aberdeen Scotland A facility is provided within the RoxAnn processor to blank out heavy mid water echoes from fish shoals plankton etc This is rarely required and is usually only relevant for operations in deep water A set of small plug in capacitors is provided with the system The required capacitor value chosen from the following table should be plugged into the RoxAnn analogue printed circuit board in place of the capacitor provided on the board during manufacture The location of the capacitor to be replaced is C71 This is removed by simply un plugging th component from the connector on the board and replacing with the chosen value Blanking Range Component Value 10 metres 150 nF 25 metres 330 nF 50 metres 680 nF 100 metres 1500 nF Issue 2 5249 31 0014 Page 17 of 30 Sonavision L
19. erent environments and with different echosounders or transducers the corresponding optimum gain settings may be dialled back into the equipment Once calibration has been completed fine tuning may be achieved by advancing the switch SW3 on the back panel master gain in a clockwise direction However this switch is generally left in the minimum gain position 0 and this is the recommended position during the Automatic Calibration operation You have now successfully installed RoxAnn and the unit is fully operational to supply data to the computer Seabed data is now available to be displayed on your chosen software package The software package may include test programs to check that RoxAnn is communicating correctly with the computer Details of these test programmes will be contained in your software manual 4 RoxAnn Operation RoxAnn signal processing is entirely automatic consequently there is minimal requirement for operational support of the hardware processing unit The RoxAnn processor features no user controls System integrity is indicated by two green LED lights mounted in the front panel The user interface to RoxAnn data is via the RoxAnn compatible software program deployed Typical features of RoxAnn compatible software include data storage display analysis post processing and data conversion for export to other programs 4 1 RoxAnn Data Output RoxAnn data is streamed from the parallel receiver via RS 232 C whi
20. g lead from the interface box is then connected directly into the echosounder If an Optional Interface Box is NOT being used connect the Head Amplifier directly to the echosounder transducer terminal as shown in Fig 5 and tie the screen shield of cable D to the transducer cable screen The RoxAnn head amplifier is high impedance and should have minimal loading on the echosounder Verify and secure all connections with reference to the relevant diagrams When this check has been completed power may be applied to the system 3 2 Connection from RoxAnn System to Computer RoxAnn data is transmitted to the computer using RS232 C format Connection of the RS232 C line Cable E to the computer serial port is shown in Figs 5 and 8 Please note that we supply the computer connector as a 9 way D type female Some computers have a 25 way serial port and in this case it will be necessary to change the connector or use a proprietary adaptor Please refer to Fig 8 for the relevant wiring details No computer handshaking is involved i e data is transferred one way from the RoxAnn System to the computer Your software manual will give full details on port selection 3 3 System Calibration Procedure 3 3 1 Introduction This Calibration Procedure relates to the setting up of the RoxAnn System at sea or in the harbour following installation The units are factory adjusted for use with a particular Echosounder specified at the time of order
21. ng Information Figure 6 RoxAnn Square Sample Calibration or Box File Figure 7 RoxAnn RS232 Wiring Diagram Figure 8 Standard RS 232 C connections Figure 9 RoxAnn Parallel Receiver Back Panel Issue 2 5249 31 0014 Page 20 of 30 Sonavision Ltd Aberdeen Scotland Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 RoxAnn Parallel Receiver General Block Diagram RoxAnn Processor PCB Layout RoxAnn Head Amplifier PCB RoxAnn Gimbal PCB RoxAnn Digital PCB RoxAnn Analogue PCB APPENDIX 2 TECHNICAL SPECIFICATIONS Issue 2 Power Supply As per Figure 3 Power Consumption approximately 10 watts Operating frequency 15 kHz 210 kHz As per Figure 3 Fuse F1 internal AC 500MA For 240v AC Supply Minimum operating water depth determined by pulse width of host echosounder typically 1m using 200 kHz Maximum operating water depth dependent on power source level of transmitter and beam width of host echosounder DC isolation is achieved by transformer coupling at the input and optocoupling isolation at RS 232 C output Output RS 232 C Weight 16 kg including cables Dimensions see Fig 4 Standard 19 rack mounting possible by removing external housing Supplied cable lengths see Fig 5 5249 31 0014 Page 21 of 30 Sonavision Ltd Aberdeen Scotland APPENDIX 3 TROUBLE SHOOTING Every RoxAnn unit is carefully set up in the factory according to an exh
22. oxAnn processes physical phenomena inherent in the echo sounder return signals which have hitherto remained unexploited Sonavision has also designed a suite of powerful and flexible data analysis and display software for RoxAnn seabed information RoxMap RoxMap 3D or RoxMap Scientific With RoxAnn you may open a window to the seabed and realise new capabilities in the study of events at the bottom We wish you every success and plain sailing with your RoxAnn operations 2 System Overview 2 1 System Components For routine RoxAnn deployment a system is configured comprising Echosounder RoxAnn hardware Computer RoxAnn compatible software program Positioning system e g DGPS Issue 2 5249 31 0014 Page 6 of 30 Sonavision Ltd Aberdeen Scotland 2 2 RoxAnn Hardware RoxAnn hardware includes a fully automatic Black Box processor and a head amplifier unit The RoxAnn head amplifier unit allows easy interface with most known echosounders by direct connection across the main transducer terminals See Fig 1 A specific system configuration for the Atlas Elektronik AE DESO range of echosounders is also possible Fig 2 Thus the RoxAnn hardware components are as follows A head amplifier which connects directly to the echosounder transducer in parallel with the echosounder and is matched for the echosounder transmitter output circuitry such that it has a negligible effect on the performance of the transceiver
23. rofile is Holes power supply on power supply continuous The depth profile has Check for spikes in Oscilloscope Change SW3 on Analog The depth profile is Holes power supply continuous PCB from Survey to Fishing The E1 and E2 numbers Check the echosounder None vary with depth pulse width Issue 2 5249 31 0014 Echosounder may vary E1 and E2 numbers do pulse width when depth not vary with depth range changes Consult echosounder manual and choose setting which keeps pulse width constant Page 27 of 30 Sonavision Ltd Aberdeen Scotland The depth profile The value used for None matches the Speed of Sound echosounder display Match the speed of Values will match sound through water with that of the but the actual values do echosounder not match The survey has covered Check software Run None Use scaling to spread Variation in results is a wide variety of known Scatterplot to see material types but the spread of data variation in display is not great data to cover the full greater range of discrimination All data is in the lower Gain setting on None Increase RoxAnn The spread of data is left hand corner of RoxAnn SW1 gain greater RoxAnn square display All the data is in the Scales on software See None Reduce E1max and The spread of data is lower left hand corner of Searano User Guide E2ma
24. td Aberdeen Scotland 5 RS232 C Syntax 5 1 Syntax for PC Computers The output string for standard RoxAnn data reads as follows DDDDDFFFFFSSSSSCR LF 17 characters long where Digit Description Digit Description 1 D 11 5 2 Decimal 12 Octal Number Number 3 Decimal 13 Octal Number Number 4 Decimal 14 Octal Number Number 5 Decimal 15 Octal Number Number 6 F 16 CR 7 Octal Number 17 LF 8 Octal Number 9 Octal Number 10 Octal Number The output string for Deep Water RoxAnn data reads as follows ddddddFFFFFSSSSSCR LF 18 characters long where Digit Description Digit Description 1 d 12 S 2 Decimal 13 Octal Number Number 3 Decimal 14 Octal Number Number 4 Decimal 15 Octal Number Number 5 Decimal 16 Octal Number Number 6 Decimal 17 CR Number 7 F 18 LF 8 Octal Number 9 Octal Number 10 Octal Number Issue 2 5249 31 0014 Page 18 of 30 Sonavision Ltd Aberdeen Scotland 11 OctalNumber Where D d Depth Data The D or the d field is the number of clock cycles from a precision oscillator that occur between a transmission pulse and a first echo return Let f Oscillator frequency see Section 5 2 RS232 Switch Settings for RoxAnn v Speed of sound c Cycle count Then Depth 21 The F field is a representation of the E1 signal level The S field is a representation of the E2 signal level These values
25. tem Calibration 9 SOE 9 Edele eo 9 3 3 On Site 10 3 4 Long Term Calibration 11 4 Automatic Calibration Further Information 12 5 Locking the Automatic Calibration nnn 12 4 RoxAnniM Operall N tuned A ee vedan 13 1 RoxAnn Data Ge labelen 13 2 Parameters of RoxAnn 13 3 The RoxAnn SUE pts 14 4 RoxAnn Data Displays 10 5 Echosounder Operation with 15 6 Master Gain Switch 16 7 Echosounder Frequency Selection 16 8 Automatic Noise 16 9 Blanking of Midwater 17 5 RS232 C SVNEAK 18 1 Syntax for 18 2 RS232 switch settings for 19 Appendix 1 List of eneen 20 Appendix 2 Technical 21 Appendix 3 Trouble Shooting nnee eneen eneen eenen 22 Issue 2 5249 31 0014 Page 5 of 30 Sonavision Ltd
26. tware display Once calibrated a keep alive battery on the Gimbal PCB will hold the correct settings for approximately 6 months provided the red button is not pushed again However it is recommended that once satisfactory operation has been achieved the system should be locked at this setting Section 3 5 3 5 Locking the Automatic Calibration The optimum gain setting may be read off the test points immediately below the red 8 position dip switch S1 on the Gimbal PCB The gain is binary coded with the MSB at the right hand side switch 8 The voltages should be measured from the Ov TP immediately to the right of the red switch to each test point below the individual DIP switches The voltages are 5V High and OV Low and each switch should be set to the corresponding voltage High or Low e g a typical setting would be 01000100 Once these settings have been confirmed the system may be locked by moving the single pole single throw switch SW6 on the Gimbal PCB to the CAL position i e pointing towards the edge of the PCB Issue 2 5249 31 0014 Page 12 of 30 Sonavision Ltd Aberdeen Scotland The system is now locked If this setting is to be retained for permanent use it is now only necessary to move the link from the J1 position to J2 This isolates the keep alive circuitry from the PCB i e switches to mains power A great advantage of the S1 switching is that if the RoxAnn equipment is being used in diff
27. use in the calibration phase there will not normally be any requirement to adjust this switch following the initial calibration of the processor unit as outlined in section 3 5 4 7 _Echosounder Frequency Selection Each RoxAnn unit is factory set for optimum performance at a user specified frequency Ideally this frequency should also be the optimum frequency for seabed classification within the range of depths intended for the system Sonavision can advise on the selection of suitable frequencies RoxAnn is not designed to give sub bottom information However in shallow water provided the depth is reasonably constant useful seabed data may be acquired when using low frequencies e g 24 or 33 kHz Signal penetration may give rise to anomalous results under certain conditions consequently we do not generally advise the operation of low frequency systems in shallow water 4 8 Automatic Noise Balance Because of problems encountered due to high ambient acoustic electrical noise within the marine laboratory wheelhouse environment Sonavision has designed special circuitry to reduce these effects The operation is automatic but is only capable of handling a maximum level of noise before the processed data becomes degraded Two green LEDs are fitted immediately below the RoxAnn label on the front panel see Fig 1 When the noise environment is acceptable the two lamps glow with equal intensity The higher the ambient noise the dimmer the l
28. x until data is greater RoxAnn square 4 2 spread display There is no difference in Gain on RoxAnn None Reduce gain on rear The results are not at output although the SW1 panel maximum value but are harder rougher only close to maximum materials are changing on the very hardest roughest materials Issue 2 5249 31 0014 Page 28 of 30 Sonavision Ltd Aberdeen Scotland There is no difference in Scales on software Increase scales of E1 The results are not at output although the calculation of E1 E2 and E2 to maximum and maximum value but are harder rougher reduce in small steps only close to maximum materials are changing on the very hardest roughest materials RoxAnn output stops PRF of echosounder None Change echosounder RoxAnn output altogether range to twice the resumes current water depth END OF DOCUMENT Issue 2 5249 31 0014 Page 29 of 30 Sonavision Ltd Aberdeen Scotland Issue 2 5249 31 0014 Page 30 of 30
29. y facilitated the calibration of the instrument and classification of different seabed types E1 data is normally displayed on the y axis of the RoxAnn Square while E2 is on the x axis This combination of data gives a specific repeatable and depth corrected signature for particular seabed materials and specific seabed phenomena A typical distribution of E1 and E2 values relating to seabed types is shown in Fig 6 This shows a typical RoxAnn boxfile produced using automatic calibration with the Odom Echotrac echosounder at a frequency of 205 kHz Transducer beam width is approximately 10 degrees Note that the maximum voltages on both E1 and E2 axes in this boxfile are 0 5 volts Thus very simply if the cursor in the RoxAnn Square is in the bottom left hand corner the material on the seabed is very soft and smooth possibly mud If it is positioned in the top right hand corner it is a very hard seabed type e g bedrock It will be readily appreciated that the infinite variety of seabed types will be characterised by many different combinations of roughness and hardness in E1 and E2 terms 4 4 RoxAnn Data Display Using the RoxAnn Square RoxAnn data may easily be colour coded to distinguish sets of E1 and E2 values indicative of specific seabed types Issue 2 5249 31 0014 Page 14 of 30 Sonavision Ltd Aberdeen Scotland Ground truthing using traditional tools such as grabs and cameras may assist in the configuration of th
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