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Information, Decision and Control, 2002. Final Program and Abstracts

Date 11-13 Feb. 2002

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Displaying Results 1 - 25 of 74
  • Information, Decision and Control (Cat.No.02EX528C)

    Publication Year: 2002
    Request permission for commercial reuse | PDF file iconPDF (404 KB)
    Freely Available from IEEE
  • The continued evolution of telecommunications networks

    Publication Year: 2002, Page(s): 15
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (41 KB) | HTML iconHTML

    Summary form only given, as follows. An earlier paper described the ways in which recent advances in technology have impacted the way that telecommunications services can be offered. This was shown to radically alter how the defence and intelligence communities must deal with telecommunications systems, as both a target and as an enabling force. This paper revisits those observations in light of f... View full abstract»

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  • The RF spectrum: is all the beachfront property gone?

    Publication Year: 2002, Page(s): 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (99 KB) | HTML iconHTML

    Summary form only given, as follows. This talk examines the challenges in spectrum sharing and spectrum allocation and challenges the audience to think in new ways about multiple access technologies. Historically, we have only used code, time, frequency, space, and power to separate systems sharing a band, and rarely more than two of these at once. In the future, as wireless system developers wres... View full abstract»

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  • Principles of insect vision and navigation, and applications to autonomous vehicles

    Publication Year: 2002, Page(s): 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB) | HTML iconHTML

    Summary form only given, as follows. Anyone who has watched a fly make a flawless landing on the rim of a teacup, or marvelled at a honeybee speeding home after collecting nectar fiom a flower patch several kilometres away, would know that insects possess visual systems that are fast, reliable and accurate. Insects cope remarkably well with their world, despite possessing a brain that carries fewe... View full abstract»

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  • Full autonomy of intelligent flight

    Publication Year: 2002, Page(s):7 - 12
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (73 KB) | HTML iconHTML

    The cost of unmanned aerial vehicle (UAV) systems includes more than simply the airframe and payload. During operations in Bosnia and Afghanistan, the Predator UAV required support of 50 to 100 people ranging in skill set from ground pilots, to mechanics, to the guards and cooks who supported the flight operation personnel. The affordability of UAV systems will be reduced if support personnel can ... View full abstract»

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  • Not all Vinnicombe metric neighbourhoods are homotopically connected

    Publication Year: 2002, Page(s):29 - 34
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB) | HTML iconHTML

    We prove by counterexample that even for two transfer functions which are close in the Nu-gap metric of Vinnicombe (1993, 1999), there does not necessarily exist a Vinnicombe metric homotopy from one transfer function to the other, such that intermediate transfer functions in the homotopy remain close to the transfer function at the beginning of the homotopy. This implies that the Vinnicombe metri... View full abstract»

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  • Computation of structural invariants of singular linear systems

    Publication Year: 2002, Page(s):35 - 40
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB) | HTML iconHTML

    We study the computation of the structural invariants of singular linear systems and the transformation of a system pencil to a Kronecker canonical form. A compressed state space system is defined and then transformed into a structural canonical form, in which the structure invariants of the original singular system can be directly identified. View full abstract»

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  • System identification, uncertainty modelling and actuator placement in the robust control of an acoustic duct

    Publication Year: 2002, Page(s):41 - 46
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB) | HTML iconHTML

    The paper considers the controller design process in the problem of robust active noise control in an acoustic duct. In particular, the paper looks at how differences in system identification and actuator location affects the disturbance attenuation performance of the resulting control system. The robust controller design methodology being considered is based on some results on minimax LQG control... View full abstract»

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  • Interference cancellation schemes for CDMA systems

    Publication Year: 2002, Page(s):47 - 52
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB) | HTML iconHTML

    Multiuser detectors for CDMA system that use the successive interference cancellation (SIC) and parallel interference cancellation (PIC) techniques have been studied separately in the past. In this paper, we propose two new multiuser detectors which are the hybrid between the SIC and PIC. Simulation results show these proposed detectors outperform the conventional detector and achieve near single-... View full abstract»

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  • Measuring change in large enterprise data networks

    Publication Year: 2002, Page(s):53 - 58
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB) | HTML iconHTML

    In the management of large enterprise data communication networks, it is difficult to discern the causes of abnormal variations in traffic distributions on the physical network because the underlying logical topology can be very dynamic. This paper uses several graph distance measures to explore whether abnormal changes in logical connectivity and traffic flows can be detected in a sample of real ... View full abstract»

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  • Median graphs and anomalous change detection in communication networks

    Publication Year: 2002, Page(s):59 - 64
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB) | HTML iconHTML

    To improve the network management of large enterprise data networks we propose a novel approach to abnormal network change detection. Periodic observations of logical communications within a network are represented as a time series of graphs. Based on two different graph distance measures, the concept of median graph is introduced. The median of a time series of graphs is a graph that is most repr... View full abstract»

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  • Sensor fusion algorithms for unmanned air vehicles

    Publication Year: 2002, Page(s):65 - 70
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB) | HTML iconHTML

    Several sensor fusion algorithms for estimating the flight parameters of an unmanned air vehicle are presented. These include the classic linear Kalman filter and unscented Kalman filter. Two methods for improving the ability of the linear Kalman filter in estimating a nonlinear plant are proposed. The advantages and disadvantages of each algorithm are illustrated through simulation using a nonlin... View full abstract»

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  • Decentralised data fusion applied to a network of unmanned aerial vehicles

    Publication Year: 2002, Page(s):71 - 76
    Cited by:  Papers (2)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB) | HTML iconHTML

    Recent progress made in the application of decentralised data fusion (DDF) algorithms to a network of heterogeneous sensors, mounted aboard a group of unmanned aerial vehicles (UAVs) is reported. The paper refers to work conducted as part of the Autonomous Navigation and Sensing Experimental Research programme; a collaborative demonstration programme undertaken by BAE Systems and the Australian Ce... View full abstract»

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  • The Global Hawk UAV Australian deployment-sensor, HCI and ground element design for surveillance missions

    Publication Year: 2002, Page(s):77 - 82
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB) | HTML iconHTML

    The Global Hawk high altitude endurance unmanned aerial vehicle was deployed to Australia in April 2001 for six weeks. The system conducted eleven missions with the focus on maritime surveillance. This was the culmination of two years collaboration between the United States and Australia which included development of three new sensor modes, sensor control and exploitation techniques to efficiently... View full abstract»

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  • A virtual environment for evolutionary autonomous optimization of real time stochastic control design

    Publication Year: 2002, Page(s):83 - 88
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (101 KB) | HTML iconHTML

    The work leads with three dimensional environments for industrial processes visualization and the study of control parameters for the optimisation of real time systems simulation with evolutionary approach. The initial motivation behind the development of adaptive control models was the need to account for uncertainty in the parameters and structure of physical systems. When such a system to be co... View full abstract»

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  • Automation and integration to prevent UAV collisions

    Publication Year: 2002, Page(s):89 - 94
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB) | HTML iconHTML

    The design of an automatic air collision avoidance system (Auto ACAS) is intended to prevent air-to-air collisions between air vehicles. The Auto ACAS is not to replace existing designs such as the Traffic Alert and Collision Avoidance System (TCAS) but to accomplish a recovery at the last instant to prevent a collision. TCAS and other systems in use today provide situational awareness and traffic... View full abstract»

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  • Autonomous shipboard launching of unmanned air vehicles (UAVs) in extreme conditions

    Publication Year: 2002, Page(s):95 - 100
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (40 KB) | HTML iconHTML

    This research involves a solution to the control problem for autonomous launching of unmanned air vehicles from maritime platforms in extreme conditions. A controller is developed utilising both linear robust modern control theory (/spl Hscr//sub /spl infin// methods) and a new approach involving trajectory optimisation and system identification. The resulting controller is found to allow the airc... View full abstract»

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  • An observation of power law distribution in dynamic networks

    Publication Year: 2002, Page(s):101 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB) | HTML iconHTML

    Network dynamics has become a popular area of study because of the evolutionary and adaptive nature of networks over time. Therefore, abnormal change detection is critical to the understanding and control of network dynamics. This paper presents differences in graph diameter as a method for detecting abnormal changes in a network time series. A formal definition of graph diameter is presented, as ... View full abstract»

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  • The geometric significance of spectral nulls

    Publication Year: 2002, Page(s):107 - 111
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB) | HTML iconHTML

    The paper considers the effect of channel spectral nulls on the performance in communication systems. It is first demonstrated that there exists a natural coordinate system in which one can study the performance of a broad class of communication systems operating over finite impulse response channels. Moreover, in this coordinate system, there exists a sensible measure of performance which is conv... View full abstract»

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  • Real-time performance analysis of a fieldbus-based network

    Publication Year: 2002, Page(s):113 - 118
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB) | HTML iconHTML

    Message delay is one of the main issues in a real-time fieldbus-based distributed control system (DCS). Serious delay will degrade the performance of a control system and even invalidate it. Industry-used fieldbuses try to improve their real-time capacity using different algorithms. In this paper, we investigate the real-time performance of the fieldbus-based network. We take LonWork as our model.... View full abstract»

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  • A note on the classification error of an SVM in one dimension

    Publication Year: 2002, Page(s):119 - 122
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB) | HTML iconHTML

    There are many algorithms available for detecting noise corrupted signals in background clutter. In cases where the exact statistics of the noise and clutter are unknown, the optimal detector may be estimated from a set of samples of each. One method for doing this is the support vector machine (SVM), which has a detection performance that is dependent on some regularisation parameter C, and canno... View full abstract»

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  • On-board camera 3D-motion analysis

    Publication Year: 2002, Page(s):123 - 128
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB) | HTML iconHTML

    Estimation of on-board camera's 3D motion has been a very important technique for autonomous robot navigation and other vision-based detecting and measuring tasks. Due to the nonlinearity and continuously changing background, on-board camera's 3D-motion analysis is very complex and always employs optical flows, line matching of road lane-marks or horizon tracking. It incurs a huge calculation cost... View full abstract»

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  • High-density model of content distribution network

    Publication Year: 2002, Page(s):129 - 134
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB) | HTML iconHTML

    It is well known that optimal server placement is NP-hard. We present an approximate model of a content distribution network for the case when both clients and servers are dense, and propose a simple server allocation and placement algorithm based on high-rate quantization theory. The key idea is to regard the location of a request as a random variable with probability density that is proportional... View full abstract»

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  • Method of calculating classifier correlation for decision fusion

    Publication Year: 2002, Page(s): 26
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB) | HTML iconHTML

    Summary form only given, as follows. This paper deals with the concept of correlation in multi-classifier fusion tasks. The need to View full abstract»

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  • Data deterioration: using laboratory measurements for dynamic calibration

    Publication Year: 2002, Page(s):141 - 144
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (27 KB) | HTML iconHTML

    Introduces a concept of data deterioration and discusses concepts of on-line dynamic calibration and data fusion in process automation, mainly in the area of pulp and paper. A few cases are presented after theoretical discussion. In dynamic calibration the laboratory analysis is used as a calibration reference to the online measurement. Also data fusion can be used to combine the measurements. Fuz... View full abstract»

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