User profiles for Girish Chowdhary

Girish Chowdhary

Associate Professor
Verified email at illinois.edu
Cited by 8440

Research and development in agricultural robotics: A perspective of digital farming

…, L Pitonakova, D Ahmad, G Chowdhary - 2018 - ntnuopen.ntnu.no
Digital farming is the practice of modern technologies such as sensors, robotics, and data
analysis for shifting from tedious operations to continuously automated processes. This paper …

Concurrent learning adaptive control of linear systems with exponentially convergent bounds

G Chowdhary, T Yucelen, M Mühlegg… - … Journal of Adaptive …, 2013 - Wiley Online Library
Concurrent learning adaptive controllers, which use recorded and current data concurrently
for adaptation, are developed for model reference adaptive control of uncertain linear …

Aerodynamic parameter estimation from flight data applying extended and unscented Kalman filter

G Chowdhary, R Jategaonkar - Aerospace science and technology, 2010 - Elsevier
Aerodynamic parameter estimation is an integral part of aerospace system design and life
cycle process. Recent advances in computational power have allowed the use of online …

Robust deep reinforcement learning with adversarial attacks

…, Z Tang, S Liu, G Bommannan, G Chowdhary - arXiv preprint arXiv …, 2017 - arxiv.org
This paper proposes adversarial attacks for Reinforcement Learning (RL) and then
improves the robustness of Deep Reinforcement Learning algorithms (DRL) to parameter …

Theory and flight-test validation of a concurrent-learning adaptive controller

GV Chowdhary, EN Johnson - Journal of Guidance, Control, and …, 2011 - arc.aiaa.org
ADAPTIVE control has been extensively studied for aerospace applications. Many active
research directions exist: for example, Lewis [1], Kim and Lewis [2], and Patiño et al.[3] have …

Concurrent learning for parameter estimation using dynamic state-derivative estimators

…, B Reish, G Chowdhary… - IEEE Transactions on …, 2017 - ieeexplore.ieee.org
A concurrent learning (CL)-based parameter estimator is developed to identify the unknown
parameters in a nonlinear system. Unlike state-of-the-art CL techniques that assume …

Concurrent learning for convergence in adaptive control without persistency of excitation

G Chowdhary, E Johnson - 49th IEEE Conference on Decision …, 2010 - ieeexplore.ieee.org
We show that for an adaptive controller that uses recorded and instantaneous data concurrently
for adaptation, a verifiable condition on linear independence of the recorded data is …

GPS‐denied indoor and outdoor monocular vision aided navigation and control of unmanned aircraft

G Chowdhary, EN Johnson, D Magree… - Journal of field …, 2013 - Wiley Online Library
GPS‐denied closed‐loop autonomous control of unstable Unmanned Aerial Vehicles (UAVs)
such as rotorcraft using information from a monocular camera has been an open problem. …

Bayesian nonparametric adaptive control using Gaussian processes

G Chowdhary, HA Kingravi, JP How… - IEEE transactions on …, 2014 - ieeexplore.ieee.org
Most current model reference adaptive control (MRAC) methods rely on parametric adaptive
elements, in which the number of parameters of the adaptive element are fixed a priori, …

An automated battery management system to enable persistent missions with multiple aerial vehicles

NK Ure, G Chowdhary, T Toksoz… - IEEE/ASME …, 2014 - ieeexplore.ieee.org
This paper presents the development and hardware implementation of an autonomous battery
maintenance mechatronic system that significantly extends the operational time of battery …