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International Global Navigation Satellite Systems Association
IGNSS Conference 2016
Colombo Theatres, Kensington Campus, UNSW Australia
6 – 8 December 2016
Evaluation of accuracy, integrity and availability of
ARNS multi-constellation signals for aviation users
in Australia
Manoj Deo
PhD Candidate, Department of Spatial Sciences, Curtin University,
GPO Box U 1987, Perth WA 6845, Australia
Phone: +61 432163000
Email: manoj.deo01@gmail.com
Ahmed El-Mowafy
Assoc. Professor, Department of Spatial Sciences, Curtin University,
GPO Box U 1987, Perth WA 6845, Australia
Phone: +61 8 9266 3403
Fax: +61 8 9266 2703
Email: a.el-mowafy@curtin.edu.au
ABSTRACT
Aviation requires the use of signals operating in the protected aeronautical
radionavigation service (ARNS) band. For GPS, only single frequency signal
(L1 C/A) are currently allowed, which contains ionosphere delays. Although
Space Based Augmentation Systems (SBAS) may be used to enhance the
accuracy and integrity of single frequency aviation users, this service is not
available in Australia. GPS Block IIF satellites transmitting the L5 civil
signal, which falls in the ARNS band allows for elimination of ionospheric
delay when combined with L1 C/A. Beidou has two ARNS protected signals,
whereas Galileo has three protected signals. With these systems, multi-
frequency multi-constellation (MFMC) GNSS may become a primary means
of navigation in the next decade for all phases of flight operations, including
precision approach.
This paper presents the current status of the accuracy, integrity and availability
of ARNS protected signals in Australia which will help in early understanding
of its future performance. The present number of MFMC satellites in operation
can facilitate this initial testing. MFMC data for ARNS signals collected from
several Australian sites was analysed to demonstrate the current snapshot of
accuracy, availability and integrity for aviation. Promising results are shown
and further improvements are expected as additional satellites are launched,
with improved information. Analysis of integrity monitoring with tested
MFMC data showed that integrity can be achieved for almost 100% of the
time.
KEYWORDS: GNSS, positioning, navigation, accuracy, availability.
