Aerospace and Electronic Systems Magazine April 2018 - 2
In This Issue - Technically
NONLINEAR RECEDING HORIZON CONTROL-BASED REAL-TIME GUIDANCE, NAVIGATION, AND CONTROL ARCHITECTURE
FOR LAUNCH VEHICLES
This research investigates a novel application of real-time, nonlinear, receding horizon control methodology, with emphasis on
guidance, navigation, and control for small rocket missions. Here, an iterative, nonlinear, receding horizon control scheme is presented that is implemented and run in real time. The functionality of the framework is demonstrated on a 2-state missile dynamics
example, where the outcomes of the simulations demonstrate the applicability of such a framework to complex missile dynamics.
Real-time execution schemes are investigated, and results show that the execution of such algorithms in real-time are feasible.
Analysis is also conducted to show that the control methodology is robust to sensor noise, uncertainties in actuator control, and
variations in altitude and velocity.
FULLY OPTICAL SPACECRAFT COMMUNICATIONS: IMPLEMENTING AN OMNIDIRECTIONAL PV-CELL RECEIVER AND 8MB/S
LED VISIBLE LIGHT DOWNLINK WITH DEEP LEARNING ERROR CORRECTION
Existing free space optical communication techniques require high pointing accuracies, drastically driving up overall system cost.
Recent developments in LED-based visible light communication (VLC) and past in-orbit experiments have convinced us that the
technology has reached a critical level of maturity. On these premises, we propose a new optical communication system utilizing a
VLC downlink and a high throughput, omnidirectional photovoltaic cell receiver system. By performing error-correction via deep
learning methods and by utilizing phase-delay interference, the system is able to deliver data rates that match those of traditional
laser-based solutions. A prototype of the proposed system has demonsted the scheme to be a feasible alternative to laser-based
methods.
APPLICATION OF MODEL-BASED SYSTEMS ENGINEERING IN SMALL SATELLITE CONCEPTUAL DESIGN - A SYSML
APPROACH
In this article, we have explored application of model-based systems engineering (MBSE) in conceptual design of remote sensing
satellites to investigate the usefulness of the MBSE approach in improving system engineering processes and practices in future
space missions. We have used System Modeling Language (SysMLTM) to develop a model repository for a remote sensing student
satellite (NSS-1) project in which mission requirements are formulated as requirement diagrams. Physical aspects of the satellite
design specifications are captured in the form of SysML block definition diagrams (BDD) at system, subsystem, and unit level. The
behavioral modeling is performed using SysML activity and state machine diagrams. Internal block diagrams (IBD) and parametric
diagrams are used to establish parametric relationship among different design entities and perform mathematical analyses.
SIMULATION MODELLING OF A TRAFFIC COLLISION AVOIDANCE SYSTEM WITH WIND DISTURBANCE
Due to the potentially catastrophic results associated with aircraft midair collisions in aircraft operations, simulation modelling appears as the perfect substitute for actual flight testing as a way to ensure the effectiveness and safety of a traffic collision avoidance
system (TCAS). This article proposes an airspace encounter model with added wind disturbance to provide a statistical representation of geometries and aircraft behaviour during a close encounter that is representative of actual airspace conditions; otherwise, the
risk associated with relying on a TCAS could be significantly over- or underestimated. A typical three-aircraft scenario is depicted
to represent the TCAS responses to the evolution of different conflict and collision situations with and without wind disturbance.
Quantitative measurement experiments are conducted to further the investigations.
MULTIFUNCTIONAL AND COMPACT 3D FMCW MIMO RADAR SYSTEM WITH RECTANGULAR ARRAY FOR MEDIUM RANGE
APPLICATIONS
This article presents an approach to combine a 3D Frequency Modulated Continuous Wave (FMCW) Multiple Input Multiple Output (MIMO) radar system with additional sensors and/or actuators in order to introduce multiple functions that are integrated in a
single system. A rectangular MIMO array with two rows of Transmit (TX) antennas and two rows of Receive (RX) antennas that
are placed opposite to each other offers an empty space in the center. This allows additional devices, like a camera or a communication system, to be introduced into the unused space. In order to exploit synergies, a central processing unit capable of controlling
the system and evaluating the data is installed. The hardware and software architecture, measurements, and 3D radar images for
this multifunctional MIMO radar system with a camera and a gimbal for target tracking are described.
2
IEEE A&E SYSTEMS MAGAZINE
APRIL 2018
Table of Contents for the Digital Edition of Aerospace and Electronic Systems Magazine April 2018
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Aerospace and Electronic Systems Magazine April 2018 - Cover2
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