IMAGENEX 881A-GS User manual

881A-GS 10,000 m Imaging
445-096 JULY 2015-REVISED MAY 2017
Specifications subject to
IMAGENEX MODEL 881A-GS
10000 m GYRO STABILIZED
MULTI-FREQUENCY IMAGING SONAR
APPLICATIONS: FEATURES:
•ROV, AUV, & UUV •Serial Communications
•Manned Submersibles •Programmable (format available)
•Search & Recovery •Gyro stabilized transducer steering
•Borehole/cave work •Simple set-up and installation
•Drop sonar •Full scale range from 1 m to 200 m
•Scientific Research •Orientation module
•CHIRP Technology
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.
Copyright ©2015 - 2019
change without notice www.imagenex.com Imagenex Technology Corp.

HARDWARE
SPECIFICATIONS:
FREQUENCY 310 kHz, 675 kHz, or 1 MHz (standard default settings)
-Other frequencies can be selected through programmable
software configurations
(Tunable from 280 kHz to 1.1 MHz in 5 kHz steps)
TRANSDUCER Imaging type, fluid compensated
TRANSDUCER BEAM WIDTH 310 kHz: 4°x 40°
675 kHz: 1.8°x 20°
1 MHz: 0.9°x 10°
RANGE RESOLUTION 1 m – 4 m: 2 mm (0.08”)
5 m & up: 10 mm (0.4”)
ORIENTATION MODULE (accuracies):
PITCH & ROLL ± 0.1° typical
HEADING (Magnetic) ± 1.0° typical
MIN. DETECTABLE RANGE 150 mm (6”)
MAX. OPERATING DEPTH 10000 m
MAX. CABLE LENGTH 1000 m on typical twisted shielded pair (RS-485)
INTERFACE RS-485 serial interface @ 115.2 kbps (or optional RS-232)
CONNECTOR End mounted, four conductor, wet mateable
(Subconn BH4M-Ti)
POWER SUPPLY 20 – 36 VDC at less than 7 Watts
DIMENSIONS (for both depths) 101.6 mm (4”) diameter x 382.1 mm (15.04”) length
WEIGHT: In Air
In Water
~ 8 kg (~ 17 lbs)
~ 5.5 kg (~ 12 lbs)
MATERIALS Titanium & Polyurethane
FINISH None
881A-GS 10000 m 2
445-096 www.imagenex.com

SOFTWARE
SPECIFICATIONS: Win881AL.exe
WINDOWS™OPERATING SYSTEM Windows™XP, Vista, 7, 8, 10
MODES Sector, Polar and Side Scan
GYRO MODES North Up, Heading Up, Target Steering
RANGE SCALES 1 m, 2 m, 3 m, 4 m, 5 m, 10 m, 20 m, 30 m, 40 m,
50 m, 60 m, 80 m, 100 m, 150 m, 200 m
TRAIN ANGLES Continuous rotation, 3°increments
SECTOR SIZE:
SECTOR MODE
POLAR MODE
0°– 180°, 3°increments
0°– 357°, 3°increments, or Continuous rotation
STEP SIZES Slow (0.3°), Medium (0.6°), Fast (0.9°), Faster (1.2°),
Fastest (2.4°)
GRID TYPES Polar and rectangular
FILE FORMAT (filename).81R
RECOMMENDED
MINIMUM COMPUTER
REQUIREMENTS:
2 GHz Pentium 4
256 MB RAM
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 3
445-096 www.imagenex.com

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PRELIMINARY
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THE INFORMATION CONTAINED IN THIS
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IMAGENEX TECHNOLOGY CORP. ANY
REPRODUCTION IN PART OR AS A WHOLE
WITHOUT THE WRITTEN PERMISSION OF
IMAGENEX TECHNOLOGY CORP. IS
PROHIBITED.
PROPRIETARY AND CONFIDENTIAL
NEXT ASSY
USED ON
APPLICATION
DIMENSIONS ARE IN INCHES
TOLERANCES:
FRACTIONAL
ANGULAR: MACH BEND
TWO PLACE DECIMAL
THREE PLACE DECIMAL
INTERPRET GEOMETRIC
TOLERANCING PER:
MATERIAL
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ENG APPR.
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Q.A.
COMMENTS:
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SCALE: 1:3
UNLESS OTHERWISE SPECIFIED:
NEW
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PRELIMINARY
03MAR15
10,000m
881A GS IMAGER
SHEET 1 OF 1
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DO NOT SCALE DRAWING

IMAGENEX TECHNOLOGY CORP.
Model 881A-GS
Gyro Stabili ed Scanning Sonar
(Serial Version)
Quick Start
Number 430 - 031
Revision Date Description
00 May 6, 2014 Release
01 January 22, 2015 Software update
02 July 6, 2015 Updated Gyro cal brat on descr pt on
Spec f cat ons subject to change w thout not ce

Table of Contents
1.0 Introduction.....................................................................................................................................................................................................................................1
2.0 Getting Started:...............................................................................................................................................................................................................................1
2.1 Step-By-Step Start Up Gu de.....................................................................................................................................................................................................1
2.2 Gyro Cal brat on.........................................................................................................................................................................................................................2
2.2.1 Automat c Gyro Cal brat on.............................................................................................................................................................................................2
2.2.2 Manual Gyro Cal brat on.................................................................................................................................................................................................2
2.3 Overv ew....................................................................................................................................................................................................................................3
2.4 Hardware....................................................................................................................................................................................................................................5
2.5 Software.....................................................................................................................................................................................................................................6
2.5.1 Acqu re Target..................................................................................................................................................................................................................8
2.5.2 Lat tude Adjustment and Compass Decl nat on.............................................................................................................................................................11
2.5.3 F le S ze L m ts..............................................................................................................................................................................................................11
Appendix A – USB Converters and the Windows OS......................................................................................................................................................................12
A.1 - V rtual Commun cat on Ports................................................................................................................................................................................................12
A.2 - Common W ndows© Issues related to all USB <--> Ser al Converters................................................................................................................................13
A.3 - Determ n ng the Ass gned Com Port For All USB <--> Ser al Converters..........................................................................................................................14
Table of Figures
F gure 2.1: Unstab l zed Image...............................................................................................................................................................................................................3
F gure 2.2: Stab l zed Image...................................................................................................................................................................................................................4
F gure 2.3: 881A-GS...............................................................................................................................................................................................................................5
F gure 2.4: Opt ons Menu.......................................................................................................................................................................................................................6
F gure 2.5: Standard 881A-GS D splay..................................................................................................................................................................................................7
F gure 2.6: Acqu re Target button has been selected...............................................................................................................................................................................9
F gure 2.7: Target has been selected......................................................................................................................................................................................................10
F gure 2.8: Auto F le S zes....................................................................................................................................................................................................................11
F gure A.1: Overv ew of USB Data Converter Log c Flow..................................................................................................................................................................12
F gure A.2: System Propert es...............................................................................................................................................................................................................14
F gure A.3: System Propert es - Select Hardware Tab..........................................................................................................................................................................14
F gure A.4: Dev ce Manager – Select Ports and double cl ck dev ce...................................................................................................................................................14
F gure A.5: Port Propert es – Select “Port Sett ngs”.............................................................................................................................................................................14
F gure A.6: Creat ng a Dev ce Manager Shortcut.................................................................................................................................................................................15
Index of Tables
Table 2.1: Opt on Menu...........................................................................................................................................................................................................................6
Table 2.2: Ma n D splay..........................................................................................................................................................................................................................8
Table A.1: W ndows Com Port Ass gnment Scheme............................................................................................................................................................................13

Model 881A-GS Setup Gu de 1.0 Introduct on
1.0 Introduction
The Model 881A-GS s an advanced gyro-stab l zed, h gh-resolut on scann ng sonar system that has been des gned to prov de s mple,
rel able, and accurate representat on of underwater mages.
2.0 Getting Started:
The 881A-GS was des gned to be user fr endly and s mple to set up n the f eld. It s generally recommended however to perform a
prel m nary setup before head ng out nto the f eld.
2.1 Step-By-Step Start Up Guide
1. Phys cally mount the sonar referr ng to Section 2.4 on page 5 for deta ls.
2. Ensure 24VDC@ 1A m n mum power supply s off
3. Referr ng to Appendix A – USB Converters and the Windows OS, conf gure any necessary adaptors.
4. Connect the cable's DB9 connector to the PC’s ser al port.
5. Plug the underwater connector to the sonar.
6. Deploy to stable, flat locat on
7. Power up the 881A-GS.
8. Wa t for gyro cal brat on to complete. The sonar, upon power up, w ll cal brate the motor, delay for 10 seconds and
automat cally perform a gyro cal brat on. No commun cat on to the gyro sub system s ava lable at th s t me.
9. Ver fy the “Local Latitude” sett ng n the “. n ” f le and adjust f necessary. Refer to Section 2.5.2 on page 11 for deta ls
10. Launch the “Win881AL.exe” program
If f le playback s des red, use the menu command “File->Open File to Playback”.
If real-t me operat on s des red, use the menu command “File->Connect to Sonar Head”.
11. Proceed to Section 2.5 on page 6 for software nstruct ons.
Document Number: 430-030-02 Page 1 of 15

Model 881A-GS Setup Gu de 2.2 Gyro Cal brat on
2.2 Gyro Calibration
All gyros are sens t ve to the env ronment ( .e. temperature, mot on, Earth's rotat on, etc.) and w ll naturally dr ft w th t me. Therefore,
from t me to t me, t s recommended to ssue a gyro cal brat on ( n manual mode) or recal brate the motor (auto mode) to remove the
accumulated dr ft.
2.2.1 Automatic Gyro Calibration
Imagenex Gyro enabled scann ng sonars now ncorporate an automat c gyro b as ng feature wh ch s selectable n the user program.
Th s mode cont nuously re-b as's the gyro n real t me accommodat ng for temperature fluctuat ons and nternal dr ft. Refer to Table
2.1 on page 6 for deta ls on enabl ng / d sabl ng th s mode. When f rst start ng the sonar, the b as adjustment w ll be very rap d as the
temperature stab l zes. Wh le the gyro w ll st ll nternally dr ft, the sonar mage w ll be coherent, allow ng the operator to cont nue to
work. Note that the absolute head ng w ll not be exact dur ng th s t me as the sonar does not d fferent ate between nduced dr ft and
real movement. After a few m nutes, re-cal brate the motor to real gn the sonar and the transducer. Th s w ll reset the accumulated dr ft
that occurred dur ng the warmup per od. It s recommended to per od cally re- ssue the cal brate motor command to reset the
accumulated dr ft.
2.2.2 Manual Gyro Calibration
The nformat on below descr bes the manual b as ng mode wh ch may be necessary n strong magnet c f eld env ronments.
Do not cal brate the gyro unt l the nternal temperature of the sonar has stab l zed, approx mately 30-60m nutes underwater.
1. Mount sonar on a level, stable surface, or settle the ROV on a flat bottom.
2. Under the “Options” Menu, select “Calibrate yro”.
3. Standard sonar operat on s suspended dur ng gyro cal brat on.
4. The message “Calibrating yro” w ll appear. Cal brat on takes approx mately 30secs.
5. Once the message d sappears, standard operat on commences.
When us ng MANUAL b as ng, It s ESSENTIAL that the sonar s completely stat onary and at constant temperature
dur ng gyro cal brat on. ANY movement w ll cause undes rable dr ft n the gyro.
Document Number: 430-030-02 Page 2 of 15

Model 881A-GS Setup Gu de 2.3 Overv ew
2.3 Overview
Wh le trad t onal scann ng sonars prov de excellent magery, they have a s gn f cant short com ng...they rely on the sonar be ng
perfectly st ll dur ng data acqu s t on. Imagenex has developed the deal solut on...the 881A-GS. F gure 2.1, below, shows a non
stab l zed mage taken wh le the sonar was sp nn ng. Note the wavy l nes n the lower 2 quadrants. Now refer to the same area scanned
w th Gyro stab l zat on enabled (F gure 2.2, below). Now the mage s well def ned and stra ght.
Document Number: 430-030-02 Page 3 of 15
Figure 2.1: Unstabilized Image

Model 881A-GS Setup Gu de 2.3 Overv ew
Document Number: 430-030-02 Page 4 of 15
Figure 2.2: Stabilized Image