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Stable whitening matched filters based on Nehari's Approximation

Stable whitening matched filters based on Nehari's Approxima...

引用

8th International Symposium on signal processing and its Applications, ISSPA 2005

作者： Voon, Siong Wong White, Langford B. Gray, Doug Electrical and Electronic Engineering University of Adelaide CRC for Sensor Signal and Information Processing

ISBN: (纸本)0780392434

Trellis based equalisers provide a good tradeoff between complexity and performance in the equalisation of time dispersive communication channels. In order to induce the best performance from such equaliser structures, it is desirable that the overall communication channel be minimum-phase. The Whitening Matched Filter required to minimise the phase-delay of a mixed-phase channel is known to be completely unstable. This paper looks at the use of Nehari's Approximation as a method of finding the closest stable approximation in the uniform frequency (L∞) sense. It is concluded that such a direct approximation does not result in significant phase-delay improvements and the inclusion of smoothing time delays may improve performance. © 2005 IEEE.

关键词： Digital filters

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Target motion analysis via efficient acoustic matched processing

Target motion analysis via efficient acoustic matched proces...

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2004 Intelligent sensors, sensor Networks and information processing Conference, ISSNIP '04

作者： Searle, Stephen J. CRC for Sensor Signal Information Processing Dept. of Electrical and Electronic Engineering University of Adelaide Australia

ISBN: (纸本)0780388933

In recent years matched processing techniques have emerged as a solution for the problem of target motion analysis. A target's motion parameters are estimated by determining which of a bank of replica signals best correlates with the signal received from that target. However matched processing is notoriously computationally demanding, requiring evaluation of complex equations for replica generation, and batch processing via an exhaustive search of a multidimensional parameter space. This study presents a matched processing method for localisation of a moving acoustic source by matching Fourier coefficients from a single frequency bin. A simple range-dependent propagation model is assumed, and the Doppler effect is carefully modelled to produce realistic replicas. An efficient matching algorithm is presented which computes cost values in a recursive fashion, and does not fully evaluate poorly scoring replicas. A Simulated example demonstrates the ability of the technique at extremely low SNR with a fraction of the cost associated with exhaustive search batch processing. © 2004 IEEE.

关键词： Motion estimation

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Bounds for aircraft tracking using a hydrophone array with unknown source frequency

Bounds for aircraft tracking using a hydrophone array with u...

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2004 Intelligent sensors, sensor Networks and information processing Conference, ISSNIP '04

作者： Rice, Feng Gray, Doug A. CRC for Sensor Signal and Information Processing Department of Electrical and Electronic Engineering University of Adelaide 5005 Australia

ISBN: (纸本)0780388933

This paper derives Cramér-Rao lower bounds (CRLBs) for airborne acoustic sources tracking estimates using an array of hydrophones. The paper considers both bearing and Doppler frequency measurements in a two layer (air-sea) acoustic environment with unknown source frequency. Comparison of the CRLBs for known/unknown source frequency are given, which show that the CRLB for the known source frequency is lower than that of unknown source frequency. The extended Kalman filter has been simulated and the results verified the new CRLB. © 2004 IEEE.

关键词： Aircraft

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Bounds on joint phase and frequency estimation for pilot-assisted PSK/QAM modulation

Bounds on joint phase and frequency estimation for pilot-ass...

引用

2005 IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP '05

作者： Rice, Feng CRC for Sensor Signal and Information Processing Department of Electrical and Electronic Engineering University of Adelaide 5005 Australia

ISBN: (纸本)0780388747

This paper derives the true Cramér-Rao lower bounds (CRLB) on the individual phase estimation and the coupled carrier phase and frequency estimation for transmission bursts with pilot-assisted PSK/QAM modulation. The reduction in frequency and phase CRLBs due to introduction of embedded reference symbols increases as the modulation order increasing. It is found that the better CRLB may be obtained if the reference symbols are distributed symmetrically in the burst, especially using a preamble and postamble. At low SNR, 5% pilot symbols in the burst reduces the bound on the phase standard deviation by a factor of 10 for QPSK or higher order modulated signals. The new CRLBs for distributed pilot symbols are also presented. The comparison of the true CRLB and the CRLB of the pilot symbols has revealed that using only pilot symbols for estimation is an effective approach only if more than 5% of pilot symbols in the burst and SNR≤0 dB. © 2005 IEEE.

关键词： Phase shift keying

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A Markov model for initiating tracks with the Probabilistic Multi-Hypothesis Tracker

A Markov model for initiating tracks with the Probabilistic ...

引用

5th International Conference on information Fusion (FUSION 2002)

作者： Davey, SJ Gray, DA Colegrove, SB CRC for Sensor Signal and Information Processing Australia EEE Department Adelaide University Australia Surveillance Systems Division DSTO Australia

ISBN: (纸本)0972184414

An important problem in multi-target tracking is track initiation and termination. The tracking algorithm aims to discriminate false detections caused by various sources of interference from valid detections caused by targets of interest. This is a problem of model order estimation. One approach to solving this problem with the Probabilistic Data Association Filter has been referred to as target visibility, This paper shows how the target visibility model can be incorporated into the Probabilistic Multi-Hypothesis Tracker to provide integrated initiation and termination.

关键词： tracking track initiation multi-hypothesis tracking multi-target association

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Low elevation sea-surface target tracking using IPDA type filters

Low elevation sea-surface target tracking using IPDA type fi...

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International Conference on Radar, RADAR 2003

作者： Wang, Xuezhi Mušicki, Darko CRC for Sensor Signal and Information Processing Department of Electrical and Electronic Engineering University of Melbourne VIC3010 Australia

ISBN: (纸本)0780378709

The Integrated Probabilistic Data Association (IPDA) type filters provide estimates of the underlying target probability of existence/perceivabiiiryMsibility apart from track state maintenance. These quantities are conveniently used as a track quality measure and can be used for track confirmation and termination. The sea-surface induced multipath fading reduces the detection probability of the target at certain ranges which can lead to track loss. In this paper we use IPDA type filters to tracking a target in such scenario. The primary results presented in this paper is encouraging for a further study in the future. © 2003 IEEE.

关键词： Target tracking

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Target tracking through a coordinated turn

Target tracking through a coordinated turn

引用

2005 IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP '05

作者： Morelande, Mark R. Gordon, Neil J. CRC for Sensor Signal and Information Processing Department of Electrical and Electronic Engineering University of Melbourne Australia Tracking and Sensor Fusion Group DSTO Australia

ISBN: (纸本)0780388747

Allowing for perturbations in speed and turn rate, the state of a target moving in a coordinated turn obeys a nonlinear stochastic differential equation which cannot be discretised exactly. Existing algorithms for coordinated turn tracking avoid this problem by ignoring perturbations in the continuous-time model and adding process noise only after discretisation. We retain this modelling by discretising using first and second order Taylor approximations to the continuous-time coordinated turn dynamic model. The discrete-time models are used as the basis for a particle filter for tracking a target moving in a coordinated turn. The performances of the discretisation techniques and the effect of different coordinate systems on tracking performance are examined. © 2005 IEEE.

关键词： Tracking (position)

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The PMHT with hysteresis

The PMHT with hysteresis

引用

6th International Conference on information Fusion, FUSION 2003

作者： Davey, S.J. Grayt, D.A. Defence Science and Technology Organisation Australia School of Elec Engineering University of Adelaide Australia CRC for Sensor Signal and Information Processing Australia

ISBN: (纸本)0972184449

The Probabilistic Multi-Hypothesis Tracker (PMHT) is a recent algorithm based on the application of Expectation Maximisation to multi-target tracking. The algorithm treats the sensor measurements as independent observations of a mixture model, and the assignment of each measurement as an independent realisation of the mixing process. A result of this is that data association between tracks and measurements is performed independently for each measurement. If the mixing proportions of the mod-els are unknown, then the PMHT estimates them, assuming them to be time independent For most applications;the mixing proportions will not be time independent, but rather change smoothly with time. The PMHT with Hysteresis pro-vides a state model for the mixing proportions, allowing the PMHT to model them as random processes with arbitrary statistics. © Commonwealth of Australia 2003.

关键词： Hysteresis

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A stochastic approach to tracking objects across multiple cameras

A stochastic approach to tracking objects across multiple ca...

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17th Australian Joint Conference on Artificial Intelligence, AI 2004: Advances in Artificial Intelligence

作者： Dick, Anthony R. Brooks, Michael J. School of Computer Science University of Adelaide Adelaide SA 5005 Australia CRC for Sensor Signal and Information Processing Technology Park Mawson Lakes SA Australia

This paper is about tracking people in real-time as they move through the non-overlapping fields of view of multiple video cameras. The paper builds upon existing methods for tracking moving objects in a single camera. The key extension is the use of a stochastic transition matrix to describe people's observed patterns of motion both within and between fields of view. The parameters of the model for a particular environment are learnt simply by observing a person moving about in that environment. No knowledge of the environment or the configuration of the cameras is required. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Video cameras

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Multiple target tracking with a pixelized sensor

Multiple target tracking with a pixelized sensor

引用

2005 IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP '05

作者： Morelande, Mark R. Kreucher, Christopher M. Kastella, Keith CRC for Sensor Signal and Information Processing University of Melbourne Australia University of Michigan Ann Arbor MI United States General Dynamics Ann Arbor MI United States

ISBN: (纸本)0780388747

This paper describes a computationally efficient method for tracking multiple moving targets. The method is predicated on estimation of the joint multitarget probability density (JMPD), which is a single probabilistic entity capturing uncertainty in both the number of targets and the states of the individual targets. The non-Gaussian/nonlinear measurement model adopted here does not permit exact computation of the JMPD so some method of approximation is required. A novel particle filtering algorithm for recursive estimation of the JMPD is proposed which provides computational tractability by automatically factoring the high dimensional multitarget state when applicable and using the optimal importance density with Rao-Blackwellisization on each of the factors. The efficiency of the proposed algorithm is shown via simulation results using real, recorded target trajectories. © 2005 IEEE.

关键词： sensors

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