1. Manuals
  2. Brands
  3. IMAGENEX Manuals
  4. Sonar
  5. 881A-GS
  6. Manual

IMAGENEX 881A-GS Manual

10000 m gyro stabilized multi-frequency imaging sonar
Hide thumbs Also See for 881A-GS:
Table of Contents

Advertisement

Quick Links

Download this manual
MULTI-FREQUENCY IMAGING SONAR
APPLICATIONS:
•
ROV, AUV, & UUV
•
Manned Submersibles
•
Search & Recovery
•
Borehole/cave work
•
Drop sonar
•
Scientific Research
Gyro-stabilization of the Imagenex Model 881A-GS makes the high resolution 881A
sonar into a system capable of crystal clear visualization of the ocean environment from moving
platforms, no longer compromised by the blurring effects of host vehicle rotation. An advanced,
low drift gyro is integrated directly into the sonar head, so the sonar can now compensate for
vehicle motion in real time with unprecedented accuracy, stability, and robustness.
The enhanced capabilities of the 881A-GS have not compromised the performance of the
881A sonar. On short range, this sonar scans using a 2 mm range resolution, and can auto-adjust
acoustic frequency and resolution to scan up to a 200 m radius, 360° surrounding area.
The Model 881A-GS still has low power, simple set-up, and small size that make it an
ideal tool for large work ROV's and small inspection vehicles. On it's own it is now an amazingly
simple drop sonar and borehole inspection package: just add a laptop computer and power
supply and run the included Imagenex software.
Specifications subject to
change without notice
IMAGENEX MODEL 881A-GS
10000 m GYRO STABILIZED
www.imagenex.com
881A-GS 10,000 m Imaging
445-096 JULY 2015-REVISED MAY 2017
FEATURES:
• Serial Communications
• Programmable (format available)
• Gyro stabilized transducer steering
• Simple set-up and installation
• Full scale range from 1 m to 200 m
• Orientation module
• CHIRP Technology
Copyright © 2015 - 2019
Imagenex Technology Corp.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 881A-GS and is the answer not in the manual?

Questions and answers

Related Manuals for IMAGENEX 881A-GS

Summary of Contents for IMAGENEX 881A-GS

  • Page 1 200 m radius, 360° surrounding area. The Model 881A-GS still has low power, simple set-up, and small size that make it an ideal tool for large work ROV’s and small inspection vehicles. On it’s own it is now an amazingly simple drop sonar and borehole inspection package: just add a laptop computer and power supply and run the included Imagenex software.
  • Page 2 DIMENSIONS (for both depths) 101.6 mm (4”) diameter x 382.1 mm (15.04”) length WEIGHT: In Air ~ 8 kg (~ 17 lbs) In Water ~ 5.5 kg (~ 12 lbs) MATERIALS Titanium & Polyurethane FINISH None 881A-GS 10000 m 445-096 www.imagenex.com...
  • Page 3 20 GB Hard Disk 1024 x 768 Screen Resolution ORDERING INFORMATION: 10000 m UNIT Standard 881-000-403 RS-232 Option -006 Gyro Stabilization Option -048 Product and company names listed are trademarks or trade names of their respective companies. 881A-GS 10000 m 445-096 www.imagenex.com...
  • Page 4 THE INFORMATION CONTAINED IN THIS MATERIAL SIZE DWG. NO. 400-110 DRAWING IS THE SOLE PROPERTY OF PRELIMINARY IMAGENEX TECHNOLOGY CORP. ANY FINISH REPRODUCTION IN PART OR AS A WHOLE NEXT ASSY USED ON WITHOUT THE WRITTEN PERMISSION OF IMAGENEX TECHNOLOGY CORP. IS...
  • Page 5 IMAGENEX TECHNOLOGY CORP. Model 881A-GS Gyro Stabilized Scanning Sonar (Serial Version) Quick Start Number 430 - 031 Revision Date Description May 6, 2014 Release January 22, 2015 Software update July 6, 2015 Updated Gyro calibration description Specifications subject to change without notice...

  • Page 6: Table Of Contents

    Figure 2.1: Unstabilized Image..........................................3 Figure 2.2: Stabilized Image...........................................4 Figure 2.3: 881A-GS...............................................5 Figure 2.4: Options Menu............................................6 Figure 2.5: Standard 881A-GS Display........................................7 Figure 2.6: Acquire Target button has been selected....................................9 Figure 2.7: Target has been selected........................................10 Figure 2.8: Auto File Sizes............................................11 Figure A.1: Overview of USB Data Converter Logic Flow..................................12...

  • Page 7: Introduction

    Getting Started: The 881A-GS was designed to be user friendly and simple to set up in the field. It is generally recommended however to perform a preliminary setup before heading out into the field.

  • Page 8: Gyro Calibration

    2.2.1 Automatic Gyro Calibration Imagenex Gyro enabled scanning sonars now incorporate an automatic gyro biasing feature which is selectable in the user program. This mode continuously re-bias's the gyro in real time accommodating for temperature fluctuations and internal drift. Refer to Table 2.1 on page 6 for details on enabling / disabling this mode.

  • Page 9: Overview

    While traditional scanning sonars provide excellent imagery, they have a significant short coming...they rely on the sonar being perfectly still during data acquisition. Imagenex has developed the ideal solution...the 881A-GS. Figure 2.1, below, shows a non stabilized image taken while the sonar was spinning. Note the wavy lines in the lower 2 quadrants. Now refer to the same area scanned with Gyro stabilization enabled (Figure 2.2, below).

  • Page 10: Figure 2.2: Stabilized Image

    Model 881A-GS Setup Guide 2.3 Overview Figure 2.2: Stabilized Image Document Number: 430-030-02 Page 4 of 15...

  • Page 11: Hardware

    Model 881A-GS Setup Guide 2.4 Hardware 2.4 Hardware Figure 2.3: 881A-GS Figure 2.3, above, indicates the 881A-GS in the “Transducer Up” orientation. FRAGILE Transducer End. . This area MUST be exposed to the water with no obstruction. Do not mount sonar using this area.

  • Page 12: Software

    After installing the “Win881AL.exe” program (generally “C:\Program Files (x86)\Imagenex”), load the program by double-clicking on its icon. The program, which supports the 881A, 881L, 881A-GS, and 881L-GS will need to be told which sonar type is being connected. Choose 881A-GS from: “System =>...

  • Page 13: Figure 2.5: Standard 881A-Gs Display

    Model 881A-GS Setup Guide 2.5 Software Figure 2.5: Standard 881A-GS Display Document Number: 430-030-02 Page 7 of 15...

  • Page 14: Acquire Target

    Table 2.2: Main Display 2.5.1 Acquire Target The 881A-GS has the ability to select a target of interest, and automatically centre and scan that target on screen. The procedure is as follows. 1. Ensure the gyro is enabled and in “Target Steering” mode.

  • Page 15: Figure 2.6: Acquire Target Button Has Been Selected

    Model 881A-GS Setup Guide 2.5.1 Acquire Target Selection Cursor Figure 2.6: Acquire Target button has been selected In Figure 2.6, above, the “Acquire Target” was selected and the mouse cursor changed to . In this example, the target of interest is positioned under the target cursor.

  • Page 16: Figure 2.7: Target Has Been Selected

    Model 881A-GS Setup Guide 2.5.1 Acquire Target Figure 2.7: Target has been selected In Figure 2.7, above, the desired target from Figure 2.6 was selected. The screen automatically centred the target within a sector and rotated the sector to the top of the screen. The sonar will now scan the sector with the centred target.

  • Page 17: Latitude Adjustment And Compass Declination

    Model 881A-GS Setup Guide 2.5.2 Latitude Adjustment and Compass Declination 2.5.2 Latitude Adjustment and Compass Declination The geographical local latitude compensates for drift caused by the Earth's rotation. To set the latitude of the current location, open the file “Win881AL.ini” in a text editor and edit the lines: Local Latitude=49.250000 →...

  • Page 18: Appendix A - Usb Converters And The Windows Os

    Model 881A-GS Setup Guide Appendix A – USB Converters and the Windows OS Appendix A – USB Converters and the Windows OS With the proliferation of the “Universal Serial Bus” (USB) compatible devices available for notebook and desktop computers, manufacturers are rapidly omitting physical serial ports on their products in order to cut production costs. The USB bus is extremely versatile as there are are no Com Port conflicts, no IRQ's to deal with, and has support for up to 256 devices on one bus (while there are usually multiple USB ports on a computer, there are usually only two physical USB buses).

  • Page 19: Common Windows © Issues Related To All Usb <--> Serial

    Model 881A-GS Setup Guide Appendix A – USB Converters and the Windows OS © A.2 - Common Windows Issues related to all USB <--> Serial Converters Windows XP will assign a Com Port number to a USB device when it is first installed in the system. However, it will assign a DIFFERENT Com Port number to the same device when it is plugged into a DIFFERENT USB port on the same computer.

  • Page 20: Determining The Assigned Com Port For All Usb <--> Serial

    Follow the following Illustrations to Set the Com Port Number of the Device. Note these Illustrations are for the ATEN UC-232A Device. The procedure for the Sealevel 2104 is the same. Also, Ignore the baud rate settings. Imagenex software automatically opens the port at the correct parameters.

  • Page 21: Figure A.6: Creating A Device Manager Shortcut

    Model 881A-GS Setup Guide Appendix A – USB Converters and the Windows OS Quick Tip To make a shortcut to the Device Manager on the Windows desktop: ● Right click on the Windows desktop ● Select “New” --> Shortcut ● Enter “devmgmt.msc”...
  • Page 22 6. Future Expansion 7. Video Frame - if video is available from a connected USB frame grabber, the video frame is written to the file after the current ping data Imagenex 81R Raw Sonar Data File Format.doc Page 1 of 11...
  • Page 23 1-byte unsigned value short 2-byte signed value (LSB,MSB) WORD 2-byte unsigned value (LSB,MSB) 4-byte signed value (LSB,MDL,MDH,MSB) DWORD 4-byte unsigned value (LSB,MDL,MDH,MSB) float 4-byte single precision floating point value (LSB,MDL,MDH,MSB) Imagenex 81R Raw Sonar Data File Format.doc Page 2 of 11...
  • Page 24 83 - 86 Device List length - 1024 DWORD 87 - 90 Byte offset to Raw Sonar Data - 2048 DWORD 91 - 94 Raw Sonar Data length - variable DWORD Imagenex 81R Raw Sonar Data File Format.doc Page 3 of 11...
  • Page 25 Local Latitude (-90 South to +90 North in decimal degrees) float 391 - 394 Compass Declination (-180 to +180 in decimal degrees) float 395 - 1023 Reserved - always 0 (629 bytes) BYTE Imagenex 81R Raw Sonar Data File Format.doc Page 4 of 11...
  • Page 26 - Byte 0 = Byte offset to Device List + 64 Device 3 (MRU): - Byte 0 = Byte offset to Device List + 128 Device 4 (Gyro/Heading): - Byte 0 = Byte offset to Device List + 192 Imagenex 81R Raw Sonar Data File Format.doc Page 5 of 11...
  • Page 27 Position" (Bytes 35-36) of the Sonar Return Header. Please refer to document "425-050-01 - 881L - GS Ethernet Specifcation.pdf" for detailed information about the Sonar Return Data format for the Model 881L-GS sonar head. --------------------------------------------------------------------------------------------------------------------- Imagenex 81R Raw Sonar Data File Format.doc Page 6 of 11...
  • Page 28 5-6) of the Sonar Return Header. Please refer to document "425-051-03 - 881A - gyro Serial Specifcation.pdf" for detailed information about the Sonar Return Data format for the Model 881A-GS sonar head. --------------------------------------------------------------------------------------------------------------------- Imagenex 81R Raw Sonar Data File Format.doc...
  • Page 29 Position" (Bytes 35-36) of the Sonar Return Header. Please refer to document "425-xxx-xx - 882L - GS Ethernet Specifcation.pdf" for detailed information about the Sonar Return Data format for the Model 882L sonar head. --------------------------------------------------------------------------------------------------------------------- Imagenex 81R Raw Sonar Data File Format.doc Page 8 of 11...
  • Page 30 5-6) of the Sonar Return Header. Please refer to document "425-054-0C - 882A - Serial Specifcation.pdf" for detailed information about the Sonar Return Data format for the 882A sonar head. --------------------------------------------------------------------------------------------------------------------- Imagenex 81R Raw Sonar Data File Format.doc Page 9 of 11...
  • Page 31 Byte offset to External Sensors, (Ping Header, Bytes 103-106) = 0 External Sensor length, (Ping Header, Bytes 107-110) = 0 Section 6: Future Expansion This section is reserved for future use. Imagenex 81R Raw Sonar Data File Format.doc Page 10 of 11...
  • Page 32 58 - 60 Pixel 1 - Blue, Green, Red BYTE Video Frame Pixel N (ImageWidth x ImageHeight - 1) - Blue, Green, Red BYTE Filesize-3 (upper-right corner of image) Imagenex 81R Raw Sonar Data File Format.doc Page 11 of 11...

  • Page 33: 881A-Gs

    Imagenex Technology Corp. IMAGENEX MODEL 881A-GS with GYRO STABLIZED Option MULTI-FREQUENCY SCANNING DIGITAL SONAR HEAD Imager / Profiler SERIAL INTERFACE SPECIFICATION Version 2.0 Document Number 425-051 Revision Date Description March 31, 2014 New Format April 22, 2014 Updates May 1, 2014...
  • Page 34 OVERVIEW The Model 881A-GS Digital Sonar Head communicates over a serial communications link. To receive echo data, a command program must interrogate the sonar head by sending a Switch Data Command. When the Switch Data command is accepted, the sonar head transmits, receives and sends its return data back to the command program.
  • Page 35 Byte 5 Rev / Hold Bit 0 - 1 = Hold (or pause) Head, 0 = Resume Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 - 1 = Reverse Step Direction, 0 = Normal Operation Bit 7 Byte 6 Master / Slave The sonar head can be operated as a master or as a slave.
  • Page 36 Byte 12 Sector Width 0 to 120 (0 Deg to 360 Deg) in 3 Degree steps Byte 12 = sector_width_in_degrees/3 i.e. 0 = 0 Degrees 30 = 90 Degrees 60 = 180 Degrees 120 = 360 Degrees Byte 13 Step Size 0 to 8 in 0.3 Degree increments i.e.
  • Page 37 Byte 21 Up Baud **** NOTE: THIS FEATURE IS NOT YET AVAILABLE **** The head receives switch data at 115200 baud, but can transmit its return data at various baud rates. The Up Baud value sets the head to transmit at a new baud rate. The default Up Baud value on power-up is 115200 baud.
  • Page 38 Bytes 26-27 Sensor Command Byte 26 Byte 27 Function Enable Gyro Enable Pitch, Roll, Heading Gyro Set Transducer = UP ReBias Gyro Start compass calibration Stop compass calibration Always 0 Reserved Store Latitude Gyro Set Target Location Motion Bias Enable Reserved Reserved Reserved...
  • Page 39 Byte 34 Reserved Always 0 Byte 35 Reserved Always 0 Byte 36 Reserved Always 0 Byte 37 Reserved Always 0 Byte 38 Reserved Always 0 Byte 39 Termination Byte The head will stop looking for Switch Data when it sees this byte. Always 0xFD (253 decimal)
  • Page 40 Reserved Echo Data 0, 128, 252, 500 Data Bytes 0xFC Table 2: Model 881A-GS Sonar Head Return Data BYTE DESCRIPTIONS Note: All Byte values are shown in decimal unless noted with a '0x' prefix. N = total number of return bytes...
  • Page 41 Byte 3 Head ID 16 Head ID’s allowed: 0x10 to 0x1F Byte 4 Serial Status Bit 0 Bit 1 Bit 2 - 1 => Auto Bias Adjustment has occured Bit 3 - 1 => Gyro / PRH Error Bit 4 - 1 =>...
  • Page 42 Byte 10 - 11 Data Bytes Byte 10 Byte 11 Data Bytes (LO) Data Bytes (HI) Data Bytes High Byte = (Byte 11 & 0x7E)>>1 Data Bytes Low Byte = [((Byte 11 & 0x01)<<7) | (Byte 10 & 0x7F)] Data Bytes = (Data Bytes High Byte<<8) | Data Bytes Low Byte Bytes 12 - 13 Sonar Position Angular position of the physical unit...
  • Page 43 Byte 16 - 17 Roll Byte 16 Byte 17 Roll (LO) Roll (HI) Roll High Byte = (Byte 17 & 0x7E)>>1 Roll Low Byte = [((Byte 17 & 0x01)<<7) | (Byte 16 & 0x7F)] Roll = (Roll High Byte<<8) | Roll Low Byte if Byte 17 - Bit 6 = 0: Roll = Roll * 360/16384 in degrees if Byte 17 - Bit 6 = 1:...
  • Page 44 Byte 32 Start of Echo Data (N-33) Bytes of data If Header is ASCII 'INA': If Data Bits was set to 8: N = 285, (252 Data Bytes, 252 Points) 1st Range Point = Byte 32 2nd Range Point = Byte 33 3rd Range Point = Byte 34 4th Range Point = Byte 35 etc.

Table of Contents