Precise thinking
Benefits of combined GNSS Inertial Navigation
NovAtel’s SPAN Technology brings together two different, but complementary technologies: GNSS positioning and
Inertial Navigation. The absolute accuracy of GNSS 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 stable and continuously available, even through periods when GNSS signals are
blocked.
Why NovAtel SPAN Technology?
The foundation of SPAN Technology is its tightly coupled design that affords exceptional GNSS performance
in addition to superior bridging capability when GNSS reception is restricted. Tight integration means
satellite data is utilized even when a GNSS position is unavailable.
Furthermore, SPAN Technology delivers dramatically faster GNSS signal reacquisition resulting in more
GNSS measurements available to aid the inertial solution. This GNSS acquisition advantage results in
enhanced RTK performance while maintaining precise inertial navigation during reduced satellite
coverage. All GNSS and inertial data processing is performed onboard the OEMV receiver. The IMU is
housed in a separate enclosure from the GNSS card, so the system remains modular. Existing Propak-
V3 (RS-422) customers can upgrade their receivers to INS capable models by purchasing a firmware
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 iIMAR-FSAS SPAN system
The FSAS-EI-SN IMU is manufactured in Germany by iIMAR. The IMU features
closed-loop technology with gyro biases of less than 0.75 degrees per hour
and accelerometer biases of less than 1mg. The IMU is triggered by the
NovAtel receiver so that all IMU measurements are time synchronized to
GNSS measurements. For commercial applications, this IMU is available
within 2 months ARO and only German export approval is necessary.
FSAS SPAN
Features
35,000 hour MTBF
German commercial
export approved
200 Hz output rate
Synchronized GNSS and INS
output
SPANTM Technology integrates the iMAR FSAS-EI-SN IMU with NovAtel precision GNSS for
enhanced navigation performance.
Precise thinking
1-800-NOVATEL (U.S. & Canada) or 403-295-4900 www.novatel.com | Europe +44 1993 852-436 | Fax 403-295-4901 | E-mail sales@novatel.com
FSAS SPAN
Version 2 - Specifications subject to change without notice. © 2007 NovAtel Inc. All rights reserved. Printed in Canada. D10150
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 When SPAN is in RTK mode.
4 Export licensing restricts operation to a maximum of
18,288 meters and 514 meters per second.
5 If raw IMU measurements are logged (200 Hz), the
max rate position, velocity, attitude logs can be
requested is 50 Hz.
6 GNSS receiver sustains tracking up to 4g.
7 These are RMS values, computed with respect to a full
GPS RTK trajectory.
IMU Performance
IMU-FSAS-EI-SN
Gyro Input Range + 500 deg/sec
Gyro Rate Bias <0.75 deg/hr
Gyro Rate Scale Factor 300 ppm
Angular Random Walk 0.1 deg/ |
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