{"title":"Towards Neural Situation Evolution Modeling: Learning a Distributed Representation for Predicting Complex Event Sequences","authors":"Andrea Salfinger, L. Snidaro","doi":"10.23919/FUSION45008.2020.9190165","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190165","url":null,"abstract":"In real-world monitoring tasks, a situation can be understood as a sequence of causally related events of interest. In road traffic control, such a situation could be a rear-end collision at the end of a traffic jam, which worsens congestion and requires clearing operations and potentially rerouting. Whereas conventional event sequence prediction focuses on sequences of individual events $langle e_{1}, ldots, e_{n}rangle$, evolving situations thus can be conceived as sequences of states composed of multiple concurrent events, i.e., complex events: $langle{e_{1},ldots, e_{m}}, ldots, {e_{l},ldots, e_{n}}rangle$. Situation (evolution) prediction thus requires learning a transition model for these complex events to provide the expectations for potential successor event types. In previous work, this was represented by a Markov Chain defined on the observed complex events. However, using the entire event composite as “atomic” situation state representation does not allow capturing patterns between its individual events (e.g., events of type “accident” share similar successor event types across different event composites), nor generalizing behaviors between similar event types or incorporating additional features. Hence, we propose a neural modeling approach to learn a distributed representation of a given situation dataset. By encoding the input states as conjunction of their individual comprised events, the devised model can learn associations (i.e., enable an “information flow”) between individual event types, allowing to capture similar behaviors across different situations. We test our approach on both synthetic and real-world datasets.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124449201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Covariance Estimation for Factor Graph Based Bayesian Estimation","authors":"O. A. Vanli, Clark N. Taylor","doi":"10.23919/FUSION45008.2020.9190223","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190223","url":null,"abstract":"When attempting to estimate the state of a dynamic system, one of the common assumptions is that the uncertainty information for the inputs (measurements and dynamics) is known a-priori. Unfortunately, this is not a valid assumption in many cases, leading to the development of multiple covariance estimation techniques for both the Kalman filter and smoothing techniques. This paper presents a novel method to estimate the covariances of the inputs in a factor-graph formulation of the Bayesian estimation problem. A general solution, based on covariance estimation in linear regression problems, is presented that gives unbiased estimators of multiple variances from measured data. An iteratively re-weighted least squares (IRLS) algorithm is then used to estimate the input variances of a non-linear system using factor graph optimization. Simulation studies using a robot localization problem demonstrate the efficacy of our proposed techniques.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117211779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hoa Van Nguyen, D. Ranasinghe, A. Skvortsov, S. Arulampalam
{"title":"Computationally Efficient Methods for Estimating Unknown Input Forces on Structural Systems","authors":"Hoa Van Nguyen, D. Ranasinghe, A. Skvortsov, S. Arulampalam","doi":"10.23919/FUSION45008.2020.9190270","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190270","url":null,"abstract":"We consider the problem of estimating unknown input forces on structural systems using only noisy acceleration measurement data. This is an important task for condition monitoring, for example, to predict fatigue damage in a structure's body or to reduce transmission of vibrations in marine vessels. In this paper, we propose a new idea to estimate an input force with a sinusoidal form by formulating a force identification problem without a direct feed-through system. Consequently, the minimum variance unbiased (MVU) filter can be implemented coupled with a fast Fourier transform algorithm to estimate unknown input forces accurately in real-time. Moreover, when the input force is completely unknown, the ensemble sampling method combined with an augmented Kalman filter can be formulated to significantly reduce computation time. Experimental results confirm the effectiveness of our proposed methods and show that the formulations investigated outperform other state-of-the-art methods in term of computational cost whilst not compromising estimation performance.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121303904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Representing and updating objects' identities in semantic SLAM","authors":"Or Tslil, Amit Elbaz, Tal Feiner, Avishy Carmi","doi":"10.23919/FUSION45008.2020.9190524","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190524","url":null,"abstract":"Simultaneous localization and mapping (SLAM) deals with localizing and mapping in unknown environment. Semantic SLAM incorporates an additional layer of objects identities and their relationships. Here we suggest representing the identity of an object in semantic SLAM as a probability distribution over the object's traits, such as labels, colors, shapes, materials, etc. Objects' identities are estimated by integrating measurements from different sensors and are distinguished based on the discrepancy between the underlying probability distributions as quantified by the Bhattacharyya distance. The semantic mapping scheme is tested both in simulation and experiment using a ground robot.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124101855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Simplicio, H. Ferreira, Gustavo Villela, Felipe B. Costa, Vitor Pavani, Luma Rodrigues, C. Farias
{"title":"Development of the UFRJ Nautilus' AUV: A Multisensor Data Fusion case study","authors":"S. Simplicio, H. Ferreira, Gustavo Villela, Felipe B. Costa, Vitor Pavani, Luma Rodrigues, C. Farias","doi":"10.23919/FUSION45008.2020.9190478","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190478","url":null,"abstract":"The UFRJ Nautilus is a student-driven engineering project team at Federal University of Rio de Janeiro, focused on building and designing AUVs to compete in the AUSVI RoboSub Competition. There are several challenges on developing an AUV: location, computer vision, filters, collect and evaluate data from several sensors. The priority of the team was deliver a robot capable of localizing it self on a pool, with more reliability from all hardware and mechanical systems. We have developed a echo-localization algorithm based on the traditional beamforming that considers both time and frequency in order to have a faster and less power intensive procedure, Simulation showed that our algorithm achieved those objectives.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"71 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127373231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ajit Basarur, Jana Mayer, Antonio Zea, U. Hanebeck
{"title":"Position and Speed Estimation for BLDC Motors Using Fourier-Series Regression","authors":"Ajit Basarur, Jana Mayer, Antonio Zea, U. Hanebeck","doi":"10.23919/FUSION45008.2020.9190271","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190271","url":null,"abstract":"The control of brushless DC motors requires high-resolution angular position and accurate speed information. However, available sensor-based solutions only measure either the position or the speed directly, and then approximate the other numerically. In this work, a novel technique is presented to estimate both of these values simultaneously by sensing the stray magnetic field of the internal permanent magnets of the motor. However, achieving this requires the following two challenges to be addressed. First, the relationship between the magnetic field and the motor position is distorted by the rotational speed in a non-intuitive way, requiring careful modeling of these dependencies. Second, the derived model needs to consider that the angular position data is periodic by nature, but the magnetic field data and the angular speed data are linear (i.e., non-periodic). To achieve this, we introduce two different multidimensional regression models based on the Fourier series. Both models are first trained offline using reference data, and then used as a measurement function in a nonlinear estimator such as the EKF for online estimation. Evaluations show that both models outperform state-of-the-art techniques.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126845387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Passive sensor planning for TDOA/FDOA geolocation under communication constraints","authors":"Hugo Seuté, L. Ratton, Antoine Fagette","doi":"10.23919/FUSION45008.2020.9190509","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190509","url":null,"abstract":"This paper presents a study on electromagnetic emitter localization using time difference of arrival (TDOA) and frequency-difference-of-arrival (FDOA) measurements acquired by moving sensors in the presence of communication constraints. The problem is framed as a Markov Decision Process where the action plan is the sequence of measurements to exchange within the sensor network and the reward function is calculated based on Cramer-Rao Lower Bound. Several optimization methods are proposed and benchmarked including myopic, multi-step ahead and heuristic approaches. The benefits of a non-myopic strategy are highlighted through simulated scenarios involving moving sensor platforms and one emitting source.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130557902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Unique Animal Identification using Deep Transfer Learning For Data Fusion in Siamese Networks","authors":"Terence L van Zyl, M. Woolway, B. Engelbrecht","doi":"10.23919/FUSION45008.2020.9190426","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190426","url":null,"abstract":"The unique automated identification of animals of various species is a pressing challenge ecologically, environmentally and economically. A broader question relates to how one might exploit the somewhat more mature technologies and techniques used within human visual biometrics to automate this same task for other species. One specific technique is the use of region proposal networks and deep transfer learning in siamese networks for individual animal identification. We report that although it is relatively easy to achieve state of the art performance in uniquely identifying individuals for the easy target of zebras, trying to use the same pipeline to obtain useable, top-10> 85%, results for a more challenging species such as nyala is still an open research problem. We argue that uniquely identifying individuals such as nyala who actively try to disguise themselves in their environments require improved few-shot learning techniques and perhaps more data than the current open dataset we have provided to stimulate this area of research.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128016392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A Hyperhemispherical Grid Filter for Orientation Estimation","authors":"F. Pfaff, Kailai Li, U. Hanebeck","doi":"10.23919/FUSION45008.2020.9190611","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190611","url":null,"abstract":"Estimating orientations of objects in Euclidean space is an omnipresent challenge in robotics and autonomous systems. A useful representation of orientations involves unit quaternions. While the space of all unit quaternions forms a three-dimensional unit hypersphere, inverting the sign of a quaternion does not change the orientation described by it. Therefore, all possible orientations can be described by considering only a hemisphere of the unit hypersphere. In this paper, we propose a grid filter for arbitrary-dimensional unit hyperhemispheres and apply it to an orientation estimation task and another evaluation scenario. Our approach outperforms previous approaches that consider densities on the entire hypersphere.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134560539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Robust Terrain-Aided Navigation through Sensor Fusion","authors":"M. Lager, E. A. Topp, J. Malec","doi":"10.23919/FUSION45008.2020.9190578","DOIUrl":"https://doi.org/10.23919/FUSION45008.2020.9190578","url":null,"abstract":"To make autonomous, affordable ships feasible in the real world, they must be capable of safely navigating without fully relying on GPS, high-resolution 3D maps, or high-performance navigation sensors. We suggest a method for estimating the position using affordable navigation sensors (compass and speed log or inertial navigation sensor), sensors used for perception of the environment (cameras, echo sounder, magnetometer), and publicly available maps (sea charts and magnetic intensity anomalies maps). A real-world field trial has shown that the proposed fusion mechanism provides accurate and robust navigation, applicable for affordable autonomous ships.","PeriodicalId":419881,"journal":{"name":"2020 IEEE 23rd International Conference on Information Fusion (FUSION)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132529284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}