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Hybrid radar signal fusion for unresolved target detection

Hybrid radar signal fusion for unresolved target detection

引用

19th conference on signal and data processing of small targets

作者： Nandakumaran, N. Sinha, A. Kirubarajan, T. McMaster Univ Dept Elect & Comp Engn ETF Lab Hamilton ON Canada

ISBN: (纸本)9780819468475

Radar systems have good radial resolution, but they have poor angular resolution that results in unresolved measurements. this problem can be mitigated by utilizing the spatial diversity of multistatic radar system. In this paper, the detection of unresolved targets with a hybrid radar system using signal level fusion is considered. the system consists of two receivers: one is co-located with the transmitter and the other is located far from the transmitter. the area of interest, where the transmitter is focused on, is divided into grids, which are formed by circular range bins of the monostatic receiver and elliptical range bins of the bistatic receiver. Assuming these grids are good enough to resolve the targets (i.e., each grid has at most one target and vice versa), the amplitudes of the targets (corresponding to all grids) that maximize the likelihoods of the signals obtained from both receivers are determined. these optimum values are then compared against a threshold for the final decision. Simulation studies are performed to demonstrate the proposed algorithm for hybrid radar system with unresolved targets. the simulation results confirm the enhancement in detection of unresolved targets by fusing coherently received signals from both monostatic and bistatic receivers.

关键词： unresolved targets closely-spaced targets hybrid radar bistatic radar signal fusion

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Fixed-lag sequential Monte Carlo data association

Fixed-lag sequential Monte Carlo data association

引用

18th conference on signal and data processing of small targets

作者： Briers, Mark Doucet, Arnaud Maskell, Simon R. Horridge, Paul R. QinetiQ Ltd. (United Kingdom) Cambridge Univ. (United Kingdom) The Univ. of British Columbia (Canada)

ISBN: (纸本)0819462926

the use of multiple scans of data to improve ones ability to improve target tracking performance is widespread in the tracking literature. In this paper, we introduce a novel application of a recent innovation in the SMC literature that uses multiple scans of data to improve the stochastic approximation (and so the data association ability) of a multiple target Sequential Monte Carlo based tracking system. Such an improvement is achieved by resimulating sampled variates over a fixed-lag time window by artificially extending the space of the target distribution. In doing so, the stochastic approximation is improved and so the data association ambiguity is more readily resolved.

关键词： particle filter Sequential Monte Carlo Multi-target tracking fixed-lag data association out-of-sequence measurements

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Evaluation of an approximate crosscovariance calculation for track-to-track fusion

Evaluation of an approximate crosscovariance calculation for...

引用

16th conference on signal and data processing of small targets

作者： Sinav, A Balci, AM Bar-Shalom, Y Turkish Navy Res & Dev Ctr Command Istanbul Turkey

ISBN: (纸本)081945351X

the effect of the crosscovariance in track-to-track fusion has been studied in [2] [3] [4] [5]. Ignoring the crosscovariance of the local track estimation errors leads to optimistic covariance for the fused state estimates. However, evaluation of this crosscovariance is too demanding. Consequently, we approximate the crosscovariances between two sensors' track estimation errors in a manner similar to one of the procedures presented in [2], namely, with constant crosscorrelation coefficients. the results of using this in a practical naval surveillance system are discussed by comparing the exact covariances;of the fused tracks, the covariances obtained with the approximation and the covariances obtained by completely ignoring the crosscorrelations.

关键词： Error analysis Sensors Monte Carlo methods Filtering (signal processing) Matrices Radar Surveillance systems Computer engineering Detection and tracking algorithms Sensor fusion

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Concurrent MAP data association and absolute bias estimation with an arbitrary number of sensors

Concurrent MAP data association and absolute bias estimation...

引用

20th conference on signal and data processing of small targets

作者： Kragel, Bret D. Danford, Scott Poore, Aubrey B. Numerica Corp Loveland CO USA

ISBN: (纸本)9780819471604

Bias estimation using objects with unknown data association requires concurrent estimation of both biases and optimal data association. this report derives maximum a posteriori (MAP) data association likelihood ratios for concurrent bias estimation and data association based on sensor-level track state estimates and their joint error covariance. Our approach is unique for two reasons. First, we include a bias prior that allows estimation of absolute sensor biases, rather than just relative biases. Second, we allow concurrent bias estimation and association for an arbitrary number of sensors. the two-sensor likelihood ratio is derived as a special case of the general M-sensor result.

关键词： multiple target tracking MAP bias estimation data association assignment problems track-to-track association

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the Network Centric Warfare Paradigm: the primacy of estimation, tracking and data fusion algorithms for implementation of this vision

The Network Centric Warfare Paradigm: The primacy of estimat...

引用

14th conference on signal and data processing of small targets

作者： Gray, JE Smith-Carroll, AS McCabe, DH Murray, WJ Alouani, AT USN Ctr Surface Warfare Dahlgren Div Syst Res & Technol Dept Dahlgren VA 22448 USA

ISBN: (纸本)0819444782

What underpins this vision as axiomatic is the mantra "Information is power". Besides the necessary requirement of information exchange networks with sufficient bandwidth and computational power to treat the data being passed around the network;, algorithms are required to make sense of the data. It is estimation algorithms that turn the straw (data) into gold (information). Both proper execution and improvements in estimation algorithms are the enabling technology that facilitates the formation and usage of data across the envisioned warfare networks. We focus on some of the requirements that are driving the formation of these networks from a surface navy perspective in terms of estimation. We also discuss how these requirements focus the design of potentially new algorithms. We also discuss some of the crucial issues that may drive future requirements and algorithms.

关键词： Military operations

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Hybrid tracking algorithm using MHT and PMHT

Hybrid tracking algorithm using MHT and PMHT

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14th conference on signal and data processing of small targets

作者： Dunham, DT Hutchins, RG Independent Contractor (United States) Naval Postgraduate School (United States)

ISBN: (纸本)0819444782

Since the early 1990s, significant research has been done on a relatively new algorithm called the Probabilistic MultiHypothesis Tracker (PMHT). the majority of this research has concluded that there are a few weaknesses with this approach to tracking targets in the presence of clutter. First, the number of targets that are being tracked needs to be known a priori. Second, in order for the algorithm to operate properly, a very good initiation must be performed. Without a very close initiation, the PMHT usually fails to "lock on" to the target correctly. To address both of these issues, a hybrid approach is proposed. this hybrid approach will use a Multi-Hypothesis Tracking (MHT) algorithm to initiate new tracks and to continue tracking them until a track is stable. then it will hand these tracks off to the PMHT to maintain. the MHT is very good at initiating new tracks, and the PMHT is best at maintaining multiple tracks because the algorithm's complexity with tracking additional targets grows linearly as opposed to exponentially'.

关键词： multiple targets hybrid PMHT MHT initialization

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Robust method for detecting an infrared small moving target based on the facet-based model

Robust method for detecting an infrared small moving target ...

引用

20th conference on signal and data processing of small targets

作者： Lee, Hwal-Suk Kim, Seokkwon Park, Dong-Jo Kim, Jieun Park, Changhan Korea Adv Inst Sci & Technol Sch EECS 373-1 Guseong Dong Taejon 305701 South Korea Agcy Def Dev Taejon South Korea SAMSUNG THALES Co Ltd Adv Technol R&D Ctr Yongin 446712 Gyeonggi South Korea

ISBN: (纸本)9780819471604

In this paper, a new condition for the target is proposed to increase the robustness of the facet-based detection method for zero-mean Gaussian noise. In the proposed algorithm, the pixels detected from the maximum extremum condition are checked further to discern if they are false maximum points in the proposed scheme. the experimental results show that the proposed algorithm is much more robust for zero-mean Gaussian noise than the conventional detection method.

关键词： infrared image small target detection cubic facet model Gaussian noise

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Evaluation of a posteriori probabilities of multi-frame data association hypotheses

Evaluation of a posteriori probabilities of multi-frame data...

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19th conference on signal and data processing of small targets

作者： Mori, Shozo Chong, Chee BAE Syst Adv Informat Technol 5050 El Camino RealSuite 200 Los Altos CA 94022 USA

ISBN: (纸本)9780819468475

this paper discusses the problem of numerically evaluating multi-frame, data association hypotheses in multiple-target tracking in terms of their a posteriori probabilities. We describe two approaches to the problem: (1) an approach based on K-best multi-frame data association hypothesis selection algorithms, and (2) a more direct approach to calculating a posteriori probabilities through Markov-chain-Monte-Carlo (MCMC) or sequential Monte Carlo (SMC) methods. this paper defines algorithms based on those two approaches and compares their performance, and it discusses their relative effectiveness, using simple numerical examples.

关键词： multiple target tracking track-oriented multiple-hypothesis tracking (MHT) multiple-frame data association hypothesis K-best multiple-frame hypothesis selection Markov-chain-Monte-Carlo (MCMC) method sequential Monte Carlo (SMC) method

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Comparison of tracklet methods with deterministic dynamics and false signals - art. no. 62360Z

Comparison of tracklet methods with deterministic dynamics a...

引用

18th conference on signal and data processing of small targets

作者： Drummond, Oliver E. Dana-Bashian, David CyberRnD Inc Culver City CA 90230 USA

ISBN: (纸本)0819462926

Track fusion processing is complicated because the estimation errors of a local track and a fusion track for the same target are usually cross-correlated. If these errors are cross-correlated, that should be taken into account when designing the data association processing and the filter used to combine the track data. An approach to dealing with this cross-correlation is to use tracklets. One of the important issues in tracklet fusion performance is whether the dynamics are deterministic, e.g., no filter process noise and no target maneuver. A number of different tracklet methods have been designed. this paper presents a comparison a tracklets-from-tracks approach to a tracklets-from-measurements approach. Tracklet fusion performance is also compared to centralized measurement fusion performance. the emphasis is on performance with targets that exhibit deterministic dynamics and the possibility of measurements caused by false signals.

关键词： target tracking multiple sensor tracking track fusion multiple target tracking sensor data fusion Bayesian methods tracklet distributed tracking estimation and filtering

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An improved clustering approach for multiplatform data fusion

An improved clustering approach for multiplatform data fusio...

引用

13th conference on signal and data processing of small targets

作者： de Waard, HW Elgersma, V Thales Naval Nederland BV NL-7550 GD Hengelo Netherlands

ISBN: (纸本)0819441872

In the first part of the paper a new solution is proposed for distributed multiplatform data fusion, in which the different platforms exchange only compressed, track-related information. An improved clustering concept is introduced based on the premise that a cluster call contain a number of independent components, and based oil the definition of a marginal bearing density function for the measurements produced by a certain track. Based oil the found independent components new clusters can be formed. In the second part of the paper experimental evidence for the existence of independent components is presented. Furthermore, for the simulated multiplatform system experimental results concerning platform tracking and the reduction in the use of computer computation time, based oil implemented measures from,(1) are presented.

关键词： Distributed multiplatform data fusion multiple target tracking data-association M(ultiple) H(ypothesis) T(racking) independent component standard building block

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