Aerospace and Electronic Systems Magazine February 2018 - 2

In This Issue - Technically
Special Section: Cyber Security in Aerospace Systems Part II
HIGH THROUGHPUT, CYBER SECURE MULTI-USER SUPERPOSITION COVERT AVIONICS SYSTEM
In this article, a high throughput, cyber secure multi-user superposition covert communication (MuSC) avionics system is
proposed. By applying noise modulation and non-orthogonal multiple access (NOMA), a secure waveform with differentiated transmission power is designed for secure communication and navigation. The system supports multi-user covert superposition transmission, where a noise-like superposed signal, along with a noise signal, are transmitted to multiple receivers
simultaneously over the same spectrum on orthogonal polarized antennas. Additionally, a watermark is added to the avionics
data to validate the originality of the transmitted information. Extensive simulations are conducted to demonstrate the performance improvement on spectrum efficiency, cyber security, data sharing and protection to support avionics applications.

IS FORMAL PROOF OF SEL4 SUFFICIENT FOR AVIONICS SECURITY?
The ARINC 653 standard provides guidelines for partitioning software so that functions of differing levels of criticality are
isolated from one another. The partitioning environment operating system isolates each partition, and because it is foundational it must be certified to the highest level of criticality of any supported partition. One promising new development is
the open source seL4 microkernel, a formally proven microkernel. The seL4 microkernel is intentionally simple, providing
the bare minimum features necessary to isolate software functionality. This article introduces a few of the main concepts
related to partitioning, provides a compare and contrast overview of partitioning approaches in modern avionics, introduces
the seL4 microkernel, and finishes with an examination of what more must be done before seL4 could be considered for use
in flight software.

Regular Articles
MH370 BURST FREQUENCY OFFSET ANALYSIS AND IMPLICATIONS ON DESCENT RATE AT END-OF-FLIGHT
This article discusses in detail all known factors that could have influenced the burst frequency offsets (BFOs) associated
with the last two SATCOM messages received from Malaysian Airlines flight MH370 at 00:19:29Z and 00:19:37Z on 8
March 2014. Lower and upper bounds on its descent rate at this time were derived. The downwards acceleration over the 8
second interval between these two messages was found to be approximately 0.68 g. The derived bounds and approximate
downwards acceleration rate are consistent with simulations of an uncontrolled descent near the 7th arc as reported in te
ATSB Transport Safety Report. This suggests that 9M-MRO should lie relatively close to the 7th BTO arc. Refer to the
Australian Transport Safety Bureau website for updates on future search efforts.

A GENERIC METHOD FOR REMOTE SENSING SATELLITES CONCEPTUAL DESIGN AND RAPID SIZING BASED ON
"DESIGN FOR PERFORMANCE" STRATEGY
Space industries are increasingly keen to deploy small and low-cost satellites; which demand for low-cost design. Rapid
sizing techniques are well-known in aircraft industries as they allow designers to quickly prepare a ball-park design for
their intended aircraft. In this work, we propose a similar approach, for remote-sensing-satellites that allows designers
to become aware of the design different boundaries. The key is to prepare a 2/D space which describes any specific
mission-leg with respect to the key-configuration-parameters. Such a design tool exhibits critical mission phases and
their relationship to the key technological factors. It is expected that this method play an essential role to keep the overall
cost down. One suitable case-study have been discussed to support the proposed methodology.

AUDIO SIGNAL PROCESSING TO INVESTIGATE ALLEGED PARANORMAL PHENOMENA IN MEDIUMISTIC SÉANCES
Beyond the many interesting standard-applications for audio-signal processing, an unorthodox research area is presented:
In the darkness of mediumistic séances, audio technology is applied to investigate claims of alleged paranormal phenomena, such as so-called spirit voices. Rather than engaging in the notorious controversies about anything 'paranormal', this
research approaches the séance foremost as an exciting test-bed and showcase for many aspects of audio processing, such as
sound source localization, adaptive beamforming and forensic voice analysis. These techniques are challenged by requirements that are partially different than in more common application scenarios, but they also show their great power to provide
accurate measurements in an otherwise obscure environment.
2	

IEEE	A&E	SYSTEMS	MAGAZINE	

FEBRUARY	2018



Table of Contents for the Digital Edition of Aerospace and Electronic Systems Magazine February 2018

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