User profiles for Sharad Nagappa

Sharad Nagappa

Senior Staff Analytics Engineer, BHGE
Verified email at bhge.com
Cited by 430

On the ordering of the sensors in the iterated-corrector probability hypothesis density (PHD) filter

S Nagappa, DE Clark - Signal Processing, Sensor Fusion …, 2011 - spiedigitallibrary.org
This paper considers the effect of sensor ordering on the iterated-corrector PHD update. It is
known that changing the order of the updates results in different PHDs, however, these are …

Incorporating track uncertainty into the OSPA metric

S Nagappa, DE Clark, R Mahler - … International Conference on …, 2011 - ieeexplore.ieee.org
This paper proposes the use of the Hellinger distance in evaluating the localisation error in
the OSPA metric. The Hellinger distance provides a measure of the difference between two …

Automatic detection of underwater chain links using a forward-looking sonar

N Hurtós, N Palomeras, S Nagappa… - 2013 MTS/IEEE …, 2013 - ieeexplore.ieee.org
Underwater chain cleaning and inspection tasks are costly and time consuming operations
that must be performed periodically to guarantee the safety of the moorings. We propose a …

Evaluation of registration methods on two-dimensional forward-looking sonar imagery

N Hurtós, S Nagappa, X Cufí… - 2013 Mts/Ieee Oceans …, 2013 - ieeexplore.ieee.org
Two-dimensional forward-looking sonars such as Blueview or DIDSON are becoming a
standard sensor in both remotely-operated and autonomous underwater vehicles. Registration …

Uncertainty-driven survey path planning for bathymetric mapping

E Galceran, S Nagappa, M Carreras… - 2013 IEEE/RSJ …, 2013 - ieeexplore.ieee.org
We present a novel survey path planning technique which minimizes the robot's position
uncertainty along the planned path while taking into account area coverage performance. The …

A tractable forward–backward CPHD smoother

S Nagappa, ED Delande, DE Clark… - IEEE Transactions on …, 2017 - ieeexplore.ieee.org
To circumvent the intractability of the usual Cardinalized Probability Hypothesis Density (CPHD)
smoother, we present an approximate scheme where the population of targets born until …

Vision-based localization and mapping system for AUV intervention

N Palomeras, S Nagappa, D Ribas… - 2013 MTS/IEEE …, 2013 - ieeexplore.ieee.org
This paper presents a modular localization and mapping system for intervention autonomous
underwater vehicles working in semi-structured environments with known landmarks. The …

Real-time mosaicing with two-dimensional forward-looking sonar

N Hurtós, S Nagappa, N Palomeras… - 2014 IEEE International …, 2014 - ieeexplore.ieee.org
Forward-looking sonar can be used for underwater mapping when water visibility is poor.
The generation of an acoustic mosaic of the environment is of high interest when underwater …

SLAM with SC-PHD filters: An underwater vehicle application

CS Lee, S Nagappa, N Palomeras… - IEEE Robotics & …, 2014 - ieeexplore.ieee.org
The random finite-set formulation for multiobject estimation provides a means of estimating
the number of objects in cluttered environments with missed detections within a unified …

Towards valve turning with an AUV using Learning by Demonstration

…, N Palomeras, S Nagappa - 2013 MTS/IEEE …, 2013 - ieeexplore.ieee.org
AUVs have experimentally done the first steps to solve basic intervention tasks. First results
have been promising in the task of retrieving an object from the seabed. In this paper we …