LN200 SPAN - Canal Geomatics

LN200
SPAN
Features
20,000 hour MTBF
SPAN Technology integrates the LN200 tactical grade IMU with NovAtel precision GNSS
for enhanced navigation performance.
Low sensor noise
Easy installation
200 Hz output rate
Benefits of combined GNSS Inertial Navigation
NovAtel’s SPAN Technology brings together two different, but complementary technologies: GPS positioning and
Inertial Navigation. The absolute accuracy of GPS positioning and the stability of IMU gyro and accelerometer
measurements combine to provide a 3D position, velocity and attitude solution. Unlike GNSS-only navigation
systems, the solution is continuously available, even through periods when GPS signals are blocked.
Why NovAtel SPAN Technology
The SPAN system combines raw IMU measurements and GPS pseudorange, phase, Doppler measurements
along with position information in a tightly-coupled manner. As a result, inertial sensor errors are mitigated
while gaining faster GPS signal reacquisition and enhanced RTK performance.
All GNSS and inertial data processing is performed onboard the OEMV receiver. The IMU is housed in a
separate enclosure from the GPS card, so the system remains modular. Existing Propak-V3 customers can
upgrade their receivers to INS capable models by purchasing the IMU enclosure and software upgrade.
All configuration and data collection is done through the receiver’s standard serial ports using a simple
command and log interface. Once the hardware is installed, the system can be configured for operation
in minutes.
Specific benefits of the LN200 SPAN system
The LN200 IMU from Northrop Grumman utilizes state-of-the-art inertial fiber optic gyros and micromachined
accelerometers. The small footprint of this IMU makes it an excellent choice for mounting
inside mapping equipment. Low-noise sensor output and long MTBF make this IMU an excellent
choice for many applications.
Precise thinking

LN200 SPAN
SPAN System Performance 1
IMU Performance
IMU Physical & Electrical
Position Accuracy
Single Point L1
Single Point L1/L2
WAAS L1 only
WAAS L1/L2
DGPS
RT-20 2
RT-2
Velocity Accuracy
Attitude Accuracy
Pitch
Roll
Azimuth
Acceleration Accuracy
Max Velocity 3
Max Altitude 3
Data Rate 4
IMU Measurements
INS Position
INS Velocity
INS Attitude
1.8 m CEP
1.5 m CEP
1.2 m CEP
0.8 m CEP
0.45 m CEP
< 20 cm CEP
1 cm + 1ppm CEP
0.02 m/s RMS
(nominal)
0.015 0 RMS
0.015 0 RMS
0.05 0 RMS
0.03 m/s 2 RMS
514 m/s
18,288 m
200 Hz
200 Hz
200 Hz
200 Hz
IMU-LN200
Gyro Input Range
+
1000 deg/sec
Gyro Rate Bias
1.0 deg/hr
Gyro Rate Scale Factor
100 ppm
Angular Random Walk 0.07 deg/hr
Accelerometer Range
+
40 g
Accelerometer Linearity 150 ppm
Accelerometer Scale Factor 300 ppm
Accelerometer Bias
0.3 mg
1 Typical values. Performance specifications subject
to GPS system characteristics, US DOD operational
degradation, ionospheric and tropospheric conditions,
satellite geometry, baseline length, multipath effects
and the presence of intentional or unintentional
interference sources.
2 Expected accuracy after static convergence.
3 Export licensing restricts operation to a maximum of
18,288 meters and 514 meters per second.
4 If raw IMU measurements are logged (200 Hz), the
max rate position, velocity, attitude logs can be
requested is 50 Hz.
5 These values were computed using forced GPS
outages in data collected under good GPS availability
conditions in a land vehicle. The errors are calculated
as the difference between the full availability trajectory
and the the trajectory with forced GPS outages.
Size
Weight
Power
Power Consumption
Input Voltage
135 x 1153 x 130 mm
750 g
12 W (typical)
+ 9 to 28 V
Input/Output Connectors
Power
MIL-C-38999-III, 3 pin
Communication MIL-C-38999-III, 13 pin
Environmental
Temperature
Operating
Storage
Humidity
MTBF
-30°C to +60°C
-45°C to +80°C
95% non-condensing
20,000 hrs
Performance During GPS Outages 5
Outage
Duration
Positioning
Mode
Position Error
(m)
Velocity Error
(m/s)
Attitude Error
(degrees)
Horizontal Vertical Horizontal Vertical Roll Pitch Yaw
10 s RTK 0.11 0.04 0.012 0.003 0.003 0.003 0.006
DGPS 0.33 0.32 0.020 0.008 0.005 0.005 0.023
SP 1.07 1.97 0.024 0.010 0.005 0.005 0.030
30 s RTK 0.59 0.18 0.036 0.008 0.006 0.005 0.014
DGPS 0.73 0.42 0.038 0.010 0.006 0.006 0.026
SP 1.38 2.01 0.043 0.013 0.006 0.006 0.033
60 s RTK 2.03 0.61 0.072 0.020 0.007 0.008 0.023
DGPS 2.11 0.65 0.069 0.014 0.006 0.007 0.030
SP 2.68 2.05 0.075 0.015 0.006 0.007 0.036
Precise thinking
Version 1 - Specifications subject to change without notice.
© 2006 NovAtel Inc. All rights reserved. Printed in Canada. D10151
www.novatel.com
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