BW SENSING GI820 Series User manual

GI820 Serials
High Precision FOG Integrated
Navigation System
Technical Manual

GI820
High Precision FOG Integrated Navigation System
Applications
●Long-range Flight Guidance, Antenna System Stability
●Attitude/Azimuth Reference System, Multi-beam Attitude Sensing
●Railway Track Inspection Vehicles, Drones, Unmanned Navigation and Control
●Space Stabilization Platform, Mine Tunneling Machine, Coal Mining Machine Intelligent Navigation
and Control
The BW-GI820 is a high-performance, high-precision fiber optic integrated navigation system
developed by Bewis for the aerial mapping, unmanned aerial vehicles, sea-based and roadbed. Built-in
three-axis fiber optic gyroscope, three-axis accelerometer, optional three-axis magnetic sensor, high-
precision air pressure sensor, including a BD/GPS/GLONASS three-mode receiver. It can measure the
speed, position, attitude of the carrier, and output the compensated angular rate, acceleration,
magnetic field, air pressure, temperature and other information.
The BW-GI820 is equipped with a new integrated navigation sensor fusion algorithm engine. It is
optimized for multipath interference and can meet the needs of long-term, high-precision and high-
reliability navigation applications in urban and outdoor complex environments. The product supports
a variety of sensors such as GNSS/odometer/DVL/barometric altimeter and has excellent scalability. It
combines inertial measurement with satellite navigation and odometer information through multi-
sensor data fusion technology. These can greatly improve the system's geographical adaptability.
BW-GI820 integrated navigation system adopts coupling technology. It combines high-precision,
professional-grade, multi-channel, dual-antenna single-frequency carrier phase and pseudo-range
GPS receivers with high-precision fiber inertial measurement units.It has the characteristics of small
size, light weight and high performance.
Introduction
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Specifications

GI820
High Precision FOG Integrated Navigation System
Performance Specifications
BEWIS SENSING TECHNOLOGY LLC
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Gyro
Measuring range（deg/s）
Bias stability（˚/h）
Bias repeatability（˚/h）
Random walk coefficient（˚/√h）
Scale factor asymmetry（ppm）
Scale factor repeatability（ppm）
±1000
0.5
0.5
≤0.05
≤100
≤100
≤100
Scale factor nonlinearity（ppm）
Accelerometer
Measuring range（g）
Bias stability（µg）
Bias repeatability（µg）
Scale factor repeatability（ppm）
±10
70
70
≤200
-40～+65
-45～+70
20～2000,0.06
30,11
+9~+36
20
RS-422
100
≤145×121.5×125
2.5
Y11P-1210ZK10
Environmental
parameters
Working temperature（℃）
Storage temperature（℃）
Vibration （Hz, g2/Hz）
Shock（g, ms）
Input voltage（Vdc）
Power（W）
Data output format
Data refresh rate(Hz)
Size （mm）
Weight （kg）
Connector
Electrical parameters
Physical parameters
External GPS effective
4m baseline
Self-seeking north precision(deg)
Azimuth accuracy(deg)
Attitude angle accuracy(deg)
Speed accuracy(m/s)
Position accuracy(m)
≤2.5
≤0.05
≤0.05
≤0.03
≤2m/RTK 1cm
GPS failure
Azimuth maintaining accuracy(deg)
Attitude angle maintaining accuracy(deg)
Position accuracy(km)
≤0.5，1h
≤0.05，1h
≤10，0.5h
System measurement
range
Azimuth measurement range(deg)
Attitude measurement range(deg)
±180
±90

GI820
High Precision FOG Integrated Navigation System
Product Size：L145×W121.5×H125 （mm)
Product Size
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Note: Unfilled dimensional tolerances are performed in accordance with GB/T1804-2000 Class C.

GI820
High Precision FOG Integrated Navigation System
BEWIS SENSING TECHNOLOGY LLC
www.bwsensing.com Tel: [phone]
Product installation
The correct installation method can avoid measurement error. The inertial measurement unit
produces an absolutely smooth surface by grinding on the underside and measuring surface for
installation .The following points should be made when installing the sensor:
Finally,after the product is tightly attached,screws should be used to fix the IMU to ensure tight
fixation,smooth conduct and stable rotation.Measurement errors caused by acceleration and
vibration should be voided.Bear in mind that the screw only plays a fixed role and doe not have a
positioning function.The screw hole of the IMU is processed into an elliptical shape for easy
adjustment.
First of all, to ensure that the sensor mounting surface and the measured surface completely close,
the measured surface should be as horizontal as possible, so that we can reduce installation error.
Secondly,when the product is installed,the bottom surface of the IMU and the body should be
coincident,and it is gently pushed to make the measurement surface of the IMU coincide with that of
the machine body,so that both surfaces are tightly attached,and there is no angle in Fig.A and
Fig.C.The correct installation is shown in Fig.B and Fig.D.
the measured surface the measured surface
C D
the measured surface the measured surface
AB
uneven surface
generates the
angle
uneven surface
generates the
angle

GI820
High Precision FOG Integrated Navigation System
Debugging software
Software usage steps：
①
②
③
Ensure that the inertial navigation is absolutely static,correctly connect the serial port hardware of
the integrated navigation,and connect the power supply.
Select the computer serial port and baud rate and click to connect to the serial port.
Enter the correct geographic latitude,click Inertial Navigation Start→Command Input,the working
status on the screen shows static alignment,and the working state becomes INS navigation.At this
time,the inertial navigation enters the working state and can be used.
Electrical connections
Data cable RS422 interface definition, DB9 female:
DB9 connector pin Interface definition Remarks
1 R+Receive +
2 R-Receive -
3 T+Transmit +
4 T-Transmit -
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GI820
High Precision FOG Integrated Navigation System
Protocol
After the system is powered on, the normal operating time is 20Hz frequency, RS422 communication 115200bps,
n, 8, 1 broadcast broadcast navigation data, 48 bytes per frame data as shown in the following table:
Navigaon data
Byte number Content Data type Byte count
1-2 Frameheader: 0X5A0X A5 Byte 2
3
Workingstatus:0- Monitoring
status,1-Stacalignment,2-INS
navigaon
Byte 1
4-5 Ineralpitchangle([-90,90]
degrees) in units of 0.01 degrees
Short int (low byte first,high byte
last)
2
6-7
Ineralguiderollangle
([-180,180]degrees), unit 0.01
degree
2
8-9
Ineralazimuth([-180,180]
degrees),northto eastis -, north
to west is +, unitis 0.01degrees
2
10-11
neralX-axisangularvelocity
Wx(degree/s) in units of 0.01
deg/s
2
12-13
neral Y-axis angular velocity
Wy(degree/s) in units of 0.01
deg/s
2
14-15
neral Z-axis angular velocity
Wx(degree/s) in units of 0.01
deg/s
2
16-17 Ineral X-axis acceleraon Ax(m/
s / s), unit0.01m / s/ s 2
18-19 Ineral Y-axisacceleraonAy (m /
s / s), unit 0.01m / s/ s 2
20-21 Ineral Z-axis acceleraon Az (m /
s / s), unit0.01m / s/ s 2
22-23 Speed aer GPS satellite
posioning, unit 0.1 m / sec 2
24-25
GPS trackangle([-180,180]
degrees), north to the east is -,
north to west is +, the unit is 0.1
degrees
2
26-27 GPS satellite number 2
28-29 GPS altude, unit 0.1 m 2
30-33 Latude aer GPS satellite
posioning, unit degree
Float(low byte first, high byte
aer), value range [-90,90]
degrees, the north latude is +
and the south latude is -.
4
34-37 Longitude aer GPS satellite
posioning, unit degree
Float (low byte first, high byte
aer), value range[-180,180]
degrees, east longitude is +,west
4
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GI820
High Precision FOG Integrated Navigation System
Executive standard
●Enterprise Quality System Standard: ISO9001:2008 Standard(Certificate No.:10114Q16846ROS)
●CE certification (certificate number: 3854210814)
●ROHS (certificate number: SO81426003)
●GJB 2426A-2004 Fiber Optic Gyro Test Method
●GBT 18459-2001 sensor main static performance index calculation method
●JF 1059-1999 Evaluation and Expression of Measurement Uncertainty
●GBT 14412-2005 mechanical vibration and shock mechanical installation of accelerometer
●General requirements for GJB 450A-2004 equipment reliability
●Quality control of key parts and important parts of GJB 909A
●GJB 899 Reliability Qualification and Acceptance Test
●GJB 150-3A high temperature test
●GJB 150-4A low temperature test
●GJB 150-8A rain test
●GJB 150-12A dust test
●GJB 150-16A vibration test
●GJB 150-18A impact test
●GJB 150-23A Tilt and Swing Test
●GB/T 17626-3A RF electromagnetic radiation immunity test
●GB/T 17626-5A surge (hit) impulse immunity test
●GB/T 17626-8A power frequency magnetic field immunity test
●GB/T 17626-11A voltage dips, short interruptions and voltage changes immunity
●GB/T 2423.22-2012 Environmental testing Part 2:test method Test N:temperature
change（IEC 60068-2-14:2009,IDT）
●GB/T 10125-2012Artificial atmosphere corrosion test Salt spray test（ISO 9227:2006,IDT）
BEWIS SENSING TECHNOLOGY LLC
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GI820
High Precision FOG Integrated
Navigation System
Wuxi Bewis Sensing Technology LLC
Address: Building 30, No. 58 Xiuxi Road, Binhu District, Wuxi City
Hotline: [phone]
Tel: [phone]-801
Email: [email protected]
Website: www.bwsensing.com