In this paper, we propose a novel consistent state estimator design for visual-inertial systems. Motivated by first-estimates Jacobian (FEJ) based estimators - which uses the first-ever estimates as linearization poin...
详细信息
ISBN:
(纸本)9781728196817
In this paper, we propose a novel consistent state estimator design for visual-inertial systems. Motivated by first-estimates Jacobian (FEJ) based estimators - which uses the first-ever estimates as linearization points to preserve proper observability properties of the linearized estimator thereby improving the consistency - we carefully model measurement linearization errors due to its Jacobian evaluation and propose a methodology which still leverages FEJ to ensure the estimator's observability properties, but additionally explicitly compensate for linearization errors caused by poor first estimates. We term this estimator FEJ2, which directly addresses the discrepancy between the best Jacobian evaluated at the latest state estimate and the first-estimates Jacobian evaluated at the first-time-ever state estimate. We show that this process explicitly models that the FEJ used is imperfect and thus contributes additional error which, as in FEJ2, should be modeled and consistently increase the state covariance during update. The proposed FEJ2 is evaluated against state-of-the-art visual-inertial estimators in both Monte-Carlo simulations and real-world experiments, which has been shown to outperform existing methods and to robustly handle poor first estimates and high measurement noises.
Communication, collaboration, creativity, and critical thinking (4Cs) are regarded as vital skills for well-being and success. Nowadays, education needs to promote them by using innovative tools and enriching traditio...
详细信息
Lithium-ion batteries are a crucial component of new energy. Studying the fault diagnosis method of the batteries can ensure the safety of the system during operation. In this paper, a diagnosis method is studied base...
详细信息
In this note, the adaptive formation control for wheeled robot networks with unknown parameters and external disturbances is discussed. Unlike most existing research which utilize distance or bearing measurements to r...
详细信息
ISBN:
(纸本)9798350354416;9798350354409
In this note, the adaptive formation control for wheeled robot networks with unknown parameters and external disturbances is discussed. Unlike most existing research which utilize distance or bearing measurements to realize formation targets, ratio-of-distance (RoD) measurements are introduced into the wheeled robot networks to reach the desired formation shapes. In reality, in lieu of ideal mass-point models popularly adopted in the study of formation control, wheeled robots are described by nonholonomic kinematics which is nonlinear. To handle it better, we consider transforming the system model into an Euler-Lagrange-like system model. After system transformation, system parameters can be linearized. To simulate extensive situations, we consider these parameters are unknown, and we also consider there exist external disturbances in system. Then, we propose an adaptive distributed control law for each wheeled robot to drive the whole robotic network to acquire the desired formation shapes through RoD measurements and backstepping approach. The Lyapunov method is employed to prove the system stability.
Advancements in artificial intelligence (AI) have transformed robotics by enabling systems to autonomously execute complex tasks with minimal human involvement. Traditional methods, however, often depend on costly har...
详细信息
In the article, an alternative approach to estimating parameters in nonlinear regression models under asymmetric error distributions is examined. A novel approach for adaptive estimation is proposed, which is based on...
详细信息
ISBN:
(纸本)9783031782657;9783031782664
In the article, an alternative approach to estimating parameters in nonlinear regression models under asymmetric error distributions is examined. A novel approach for adaptive estimation is proposed, which is based on the use of second-order polynomial functions. This enables a straightforward implementation to account for deviations from Gaussian idealization in the form of moments up to the fourth order. It is demonstrated that the overall problem can algorithmically be reduced to the numerical solution of a system of nonlinear stochastic equations. Analytical expressions are obtained, which facilitate the estimation of parameters and the analysis of their asymptotic variance. Statistical modeling using the Monte Carlo method was conducted, and the results indicate that the accuracy of PMM2 estimates is comparable to SLS estimates and significantly so exceeds the accuracy of OLS estimates.
In Natural Language Processing (NLP) tasks, detecting out-of-distribution (OOD) samples is essential to safely deploy a language model in real-world problems. Recently, several studies report that pre-trained language...
详细信息
ISBN:
(纸本)9798350307627
In Natural Language Processing (NLP) tasks, detecting out-of-distribution (OOD) samples is essential to safely deploy a language model in real-world problems. Recently, several studies report that pre-trained language models (PLMs) accurately detect OOD data compared to LSTM, but we empirically find that PLMs show sub-par OOD detection performance when (1) OOD samples have similar semantic representation to in-distribution (IND) samples and (2) PLMs are finetuned under data scarcity settings. To alleviate above issues, state-of-the-art uncertainty quantification (UQ) methods can be used, but the comprehensive analysis of UQ methods with PLMs has received little consideration. In this work, we investigate seven UQ methods with PLMs and show their effectiveness in the text classification task.
The accuracy and response speed of torque in robotic joint models are crucial for enhancing the compliance of robot interactions. Consequently, parameter identification of the permanent magnet synchronous motor (PMSM)...
详细信息
Ground-based cloud observation is essential for meteorological research and climate monitoring. Existing methods for cloud detection and classification in whole-sky images (WSIs) often focus solely on binary segmentat...
详细信息
Optimal motion planning is a long-studied problem with a wide range of applications in robotics, from grasping to navigation. While sampling-based motion planning methods have made solving such problems significantly ...
详细信息
ISBN:
(纸本)9781728196817
Optimal motion planning is a long-studied problem with a wide range of applications in robotics, from grasping to navigation. While sampling-based motion planning methods have made solving such problems significantly more feasible, these methods still often struggle in high-dimensional spaces wherein exploration is computationally costly. In this paper, we propose a new motion planning algorithm that reduces the computational burden of the exploration process. The proposed algorithm utilizes a guidance policy acquired offline through model-free reinforcement learning. The guidance policy is used to bias the exploration process in motion planning and to guide it toward promising regions of the state space. Moreover, we show that the gradients of the corresponding learned value function can be used to locally fine-tune the sampled states. We empirically demonstrate that the proposed approach can significantly reduce planning time and improve success rate and path quality.
暂无评论