Firmware RAIM

RECEIVER AUTONOMOUS INTEGRITY

MONITORING (RAIM)

NovAtel’s RAIM algorithm provides

receiver autonomous integrity monitoring

for broadcast GNSS signals. Developed

based on RTCA DO-229D (2006), the

primary purpose of RAIM is for aviation

navigation systems requiring signal and

position integrity during various stages

of ﬂight. RAIM employs Fault Detection

and Exclusion (FDE) which uses

redundant pseudorange measurements

to detect and exclude faulty signals that

may cause positioning instability. The

position solution is recomputed to ensure

continuous operation in the presence of

a GNSS failure. The use of NovAtel RAIM

functionality is not restricted to aviation

applications, as users can customize

parameters to meet the requirements

of their speciﬁc application that requires

continuous operational conﬁrmation.

The beneﬁts of RAIM are apparent

when individual satellites experience

pseudorange measurement errors

that would otherwise cause signiﬁcant

positioning error. Figure 1 shows

induced pseudorange errors to satellite

measurements over time using a

GNSS Simulator. Figure 2 shows the

corresponding horizontal positioning

error when no integrity monitoring is

applied to the satellite measurements.

Figure 3 shows the optimized positioning

error when RAIM is used. In this case

the RAIM algorithm is able to detect the

pseudorange anomaly and eliminate it

from the position solution. The receiver

is then able to recalculate the position

with the bad pseudorange removed, and

produce a position with far less error.

+

Improved GNSS system integrity

+

Improved position solution

+

User alerts when RAIM is not

available

If you require more information about

Firmware, visit www.gnss.ca

For the most recent details of this product

visit www.gnss.ca

gnss.ca

sales@gnss.ca

1-855-OEM-GNSS (U.S. and Canada)

or 778-430-5999

China 0086-21-68882300

Europe 1-855-636-4677

SE Asia and Australia 1-855-636-46771

Version 4 Speciﬁcations subject to change without notice.

©2015 NovAtel Inc. All rights reserved.

NovAtel is a registered trademark of NovAtel Inc.

D16126 November 2015

Printed in Canada.

BENEFITS AND FEATURES

Latitude Error Longitude Error