yusuke1997/dblp-id-title huggingface dataset:
Limiting Apparent Target Position in Skin-Return Influenced Cross-Eye Jamming
Three-stage filter for position estimation using pseudorange measurements
Sparse kernel learning-based feature selection for anomaly detection
Warm-Start Multihomotopic Optimization for Low-Thrust Many-Revolution Trajectories
A Low-Slow-Small UAV Detection Method Based on Fusion of Range-Doppler Map and Satellite Map
Distributed Event-Triggered Nonlinear Fusion Estimation Under Resource Constraints
Infrared Small Target Detection Improvement via Hybrid Data Augmentation Using Diffusion Models and GAN
The First Carrier Phase Tracking and Positioning Results With Starlink LEO Satellite Signals
Development and Experimentation of a CubeSat Magnetic Attitude Control System Testbed
SPTL-LCC: Single-Shot, Pixel-Level, Target-Free, and LiDAR-Type Agnostic LiDAR-Camera Extrinsic Self-Calibration
High-resolution 3-D imaging of group rotating targets
Distributed State Estimation for Stochastic Linear Hybrid Systems With Finite-Time Fusion
Navigation and Control Based on Integral-Uncertainty Observer for Unmanned Jet Aircraft
High Performance Autonomous Charge Equalization in Series Connected Batteries
Attitude tracking of a rigid spacecraft using two internal torques
A Sparse Learning Approach to the Detection of Multiple Noise-Like Jammers
Probabilistic multihypothesis trackerwith an evolving poisson prior
Complete Solutions to an Automatic Target Recognition (ATR) Differential Game With Singular Surfaces
Deployment Optimization for Integrated Search and Tracking Tasks in Netted Radar System Based on Pareto Theory
Source Localization Based on Acoustic Single Direction Measurements
Sigma-Point Kalman Filtering for Spacecraft Attitude and Rate Estimation using Magnetometer Measurements
How Many Low-Precision Sensors are Enough for Reliable Detection?
Exact and Approximate Solutions for Squared-Range Target Motion Analysis
Augmented Polynomial Guidance With Impact Time and Angle Constraints
Nonlinear Guidance Laws for Maneuvering Target Interception With Virtual Look Angle Constraint
Mainlobe Deceptive Interference Suppression With Planar Frequency Diverse Array MIMO Radar
Prescribed-Time 3-D Guidance for Maneuvering Targets With Field-of-View and Approach Angle Constraints
LFHRNet: Less-Forgetting High-Resolution Network for Through-Wall Radar Imaging
Nonlinear Frequency Offset Optimization Strategy for Solving Secondary Range Ambiguity in Planar FDA-STAP Radar
Multichannel Forward Scatter Radar Using Arbitrary Waveforms
Tracking Initially Unresolved Thrusting Objects Using an Optical Sensor
Guest Editorial for the TAES Special Section on Deep Learning for Radar Applications
Autonomous Maneuver Decision for Unmanned Aerial Vehicle via Improved Pigeon-Inspired Optimization
Modeling and Stability Analysis of a Fixture-Centric Airfield Lighting System
Intensity filters on discrete spaces
Simplification of the Dynamic Cram??r-Rao Bound for Target Tracking in Clutter
An Improved GLRT for Image-Based Point Source Detection and Estimation
Robust Adaptive Filtering for Heavy-Tailed Noise and Colored Noise via Lncosh-Generalized Hyperbolic Secant
Resilient Attitude Alignment in Multispacecraft Systems
IF estimation of FM signals based on time-frequency image
A Two-Step Space-Time Adaptive Matrix Information Geometry Detector for Multichannel Radar
LSTM-Fuzzy Logic for Fault Forecasting and Mitigation in Propulsion System
Modeling Cross-Polarization Patterns of Axially Symmetrical Monopulse Antennas for Cross-Polarization Jamming Analysis
Detection-Localization Algorithms in the Around-the-Corner Radar Problem
Earth Observation Satellite Downlink Scheduling With Satellite-Ground Optical Communication Links
Observability-Based Space Noncooperative Target Motion Estimation
Vibration Control of Satellite Antennas via NMPC and NARX Neural Networks
A Low-SWaP 16-Beam 2.4 GHz Digital Phased Array Receiver Using DFT Approximation
Accuracy of Range-Based Cooperative Positioning: A Lower Bound Analysis
Adaptive Cooperative Game Penetration Guidance for Multiple Hypersonic Vehicles With Performance Constraints
Design and analysis of efficient synthesis algorithms for EDAC functions in FPGAs
Globally Optimized TDOA High-Frequency Source Localization Based on Quasi-Parabolic Ionosphere Modeling and Collaborative Gradient Projection
Integrated Target Assignment and Trajectory Optimization for Many-to-Many Midcourse Guidance
Online Estimation of Radar Emitter Cardinality via Bayesian Nonparametric Clustering
Selective buck-boost equalizer for series battery packs
Lagrangian-Based Energy-Efficient Route Learning Considering Expected Guaranteed Delay for Satellite Network
SAR Frequency-Shift Jamming Suppression Method by Shaping the Cross-Ambiguity Function
Adaptive Distributed Cooperative Tracking Control and Application for Multiagent Formation Under Communication Constraints
Fractional-Order Meta-Reinforcement Learning for Space Noncooperative Object Active Visual Tracking
Update to the Hybrid Conditional Averaging Performance Prediction of the IMM Algorithm
Computationally Efficient Long Binary Sequence Designs With Low Autocorrelation Sidelobes
Global Optimal Consensus for UAV Swarms With Time-Varying Objective Functions and Bounded Input Constraints
Real-Time Differential Signal Phase Estimation for Space-Based Systems using FPGAs
Adaptive Radar Detectors for Point-Like Gaussian Targets in Gaussian Noise
Range-Only UWB 6-D Pose Estimator for Micro UAVs: Performance Analysis
IRCI free colocated mimo radar based on sufficient cyclic prefix OFDM waveforms
Twistor-Based Global Hybrid Finite-Time Pose Tracking for 6-DOF Dual Spacecraft Formation
Composite Practically Fixed Time Controller Design for a Hypersonic Vehicle With Multisource Uncertainty and Actuator Fault
Predefined-Time Asymptotic Tracking Control for Hypersonic Flight Vehicles With Input Quantization and Faults
Framework for a Perceptive Mobile Network Using Joint Communication and Radar Sensing
Adaptive CFAR processor for nonhomogeneous environments
3-D Target Localization and Motion Analysis Based on Doppler Shifted Frequencies
Memetic Multiobjective Discrete Jaya Algorithm for Cooperative Scheduling of Multiple Agile Earth Observation Satellites
Prescribed Performance-Based Envelope Protection Control for Coaxial Compound Helicopter in High-Speed Flight
Interval Uncertainty-Oriented Optimal Control Method for Spacecraft Attitude Control
Multistatic-Radar RCS-Signature Recognition of Aerial Vehicles: A Bayesian Fusion Approach
Fast imaging method for security systems using ultrawideband radar
Orchestrating Heterogeneous NTNs: From Stochastic Geometry to Resource Allocation
AAV MiniSAR Long-Integration-Time Imaging by Modeling Spatial Variance as Sinusoidal Series
Background noise suppression for signal enhancement by novelty filtering
Novel Blind Interleaver Parameter Estimation in a Noncooperative Context
Systematic approach to IMM mixing for unequal dimension states
FSO-Based Space-Air-Ground Integrated Vehicular Networks: Cooperative HARQ With Rate Adaptation
Optimal Scheme of Pyramid Deorbit Sail in the Atmosphere and Solar Environment
Satellite Formation Flying Control by Using Only Angle Measurements
New State and Measurement Models for Endo-Atmospheric Tracking of Ballistic Targets using Seeker Measurements
Two-Stage Guidance Law With Constrained Impact via Circle Involute
Robust Stability Analysis and Performance Evaluation of a Buck Converter With Various Load Types: A Mapping Theorem Approach
Maritime Moving Target Long Time Integration for GNSS-Based Passive Bistatic Radar
Performance Measures of Covariance and Information Matrices in Resource Management for Target State Estimation
Reinforcing Transient Response of Adaptive Control Systems Using Modified Command and Reference Model
Computationally Efficient Bistatic MIMO Radar Signal Processing Architecture Based on Coupling of Range and Direction
Imbalanced Flight Test Sensor Temporal Data Anomaly Detection
Far-Field Inversion for the Deep Interior Scanning CubeSat
Effects of Mutual Coupling on the Accuracy of Adcock Direction Finding Systems
Vision-Based Navigation in Autonomous Close Proximity Operations using Neural Networks
Fixed-Time Formation Tracking for Heterogeneous Multiagent Systems Under Actuator Faults and Directed Topologies
Partial Differential Postcorrelation Processing for GPS L2C Signal Acquisition
Intrapulse radar-embedded communications via multiobjective optimization
Performance Analysis and Path-Planning for Self-Energized UAV-Assisted Relay Networks
Solar Sail Trajectory Design With Pulsed Radial Thrust
Four-Stage Guidance Law for Impact Time and Angle Control Based on the Bezier Curve
Infrared Small Target Detection via $L_{0}$ Sparse Gradient Regularized Tensor Spectral Support Low-Rank Decomposition
Radar code design for detection of moving targets
Game theoretic distributed waveform design for multistatic radar networks
Fixed-Time Filtered Adaptive Parameter Estimation and Attitude Control for Quadrotor UAVs
A Cognitive Sub-Nyquist MIMO Radar Prototype
Airborne internet access through submarine optical fiber cables
A Time-Frequency-Aware Hierarchical Feature Optimization Method for SAR Jamming Recognition
Bayesian Approximation Filtering With False Data Attack on Network
Solving the Corner-Turn Problem With an Improved Radar Range-Doppler Detection Architecture
Quantum-Interference Artificial Neural Network With Application to Space Manipulator Control
Clutter Rank Analysis in Airborne FDA-MIMO Radar With Range Ambiguity
Optimal Guidance for Quasi-Planar Lunar Ascent Based on Local Degradation
Event-Trigger-Based Adaptive Barrier Function Higher-Order Global Sliding Mode Control Technique for Quadrotor UAVs
Integral Global Sliding Mode Guidance for Impact Angle Control
Area Resolution for Bistatic Ultrawideband Ultrawidebeam SAR
Unit Circle Roots Constrained Subspace-Based Adaptive Matched Filter Detector for Moving Target Detection with Limited Secondary Data
A Likelihood Ratio Detector for QTMS Radar and Noise Radar
Fault-Tolerant Coverage Control of Multiple Satellites: A Differential Graphical Game Approach
Syntactic Modeling and Neural-Based Parsing for Multifunction Radar Signal Interpretation
Poisson Multi-Bernoulli Mixture Filter: Direct Derivation and Implementation
Optimization of Spacecraft Thrusters Configuration Under Fault Diagnosability and Recoverability Constraints
A Study of Licklider Transmission Protocol in Deep-Space Communications in Presence of Link Disruptions
Indoor Human Tracking With 3-D Expansion Estimation Based on mmWave Radar
Reinforcement Learning-Based Multitarget Detection Method for MIMO Radar via Multirank Beamformer
Multistatic Radar Imaging of Moving Targets
Phase adjustment for polarimetric ISAR with compressive sensing
Adaptive Detection in Deterministic Subspace Interference Based on Wald-Like Test
Dynamic Exhaustive Mobile Target Search Using Unmanned Aerial Vehicles
Integrating Risk Assessment and Deep-Learning-Based Anomaly Detection for Efficient Risk-Informed Decision Making for Swarm Flight Robot Systems
Challenges in Automotive MIMO Radar Calibration in Anechoic Chamber
Lagrange-Polynomial-Interpolation-Based Keystone Transform for a Passive Radar
Combined Effects of Geometric Rotation and Antenna Calibration Patterns on GNSS Phase Windup
Deep Reinforcement Learning and Edge Computing for Multisatellite On-Orbit Task Scheduling
Fault-Tolerant Formation Control for Heterogeneous Vehicles Via Reinforcement Learning
Wireless Relay Communications with Unmanned Aerial Vehicles: Performance and Optimization
Safe Coverage Control of the Vision-Based UAV System With a Performance-Boosting Strategy
Design and performance analysis of adaptive subspace detectors in orthogonal interference and gaussian noise
Max-Mahalanobis Centers Guided Adversarial Network for Generalized Few-Shot Radar Target Recognition
Iterated multiplicative extended kalman filter for attitude estimation using vector observations
Random-point-based filters: analysis and comparison in target tracking
Initial Orbit Determination using Short-Arc Angle and Angle Rate Data
Feature-Aided RGPO Jamming Discrimination Within Wideband Radar Maneuvering Target Tracking
Specific Torque Optimization of Control Moment Gyroscope Motor Based on Linear Regression Technique
Flight Demonstration of Net Electric Charge Control of Aircraft Using Corona Discharge
Radar-Updated Inertial Landing Navigation With Online Initialization
Blind Star Identification Algorithm
RTM-UAVDet: A Real-Time Multimodal UAV Detector
Lateral Entry Guidance With Terminal Time Constraint
A Dynamically Configurable Decimator for a GNSS Baseband Receiver
Characterization and statistical modeling of phase in single-channel synthetic aperture radar imagery
ArduPilot-Based Adaptive Autopilot: Architecture and Software-in-the-Loop Experiments
Efficient target detection using an adaptive compressive imager
Active Wind Rejection Control for a Quadrotor UAV Against Unknown Winds
Coherent Source Localization: Bicomplex Polarimetric Smoothing with Electromagnetic Vector-Sensors
Transactional Array Reconciliation Tomography for Precision Indoor Location
A Unified Framework Combining Feature Extraction and Reward Estimation for Cognitive Radar Policy Prediction
Explicit Parameterized Energy Management for Scramjet Transition
Three-Dimensional Swarming Using Cyclic Stochastic Optimization
Robust Time-Domain Broadband Modal Beamforming for Circular Arrays
Markov Chain Monte Carlo Multiscan Data Association for Sets of Trajectories
A Gaussian Filtering Method for Multitarget Tracking With Nonlinear/Non-Gaussian Measurements
High-Squint High-Frame-Rate Uniform-Resolution Video SAR: Parameter Design and Fast Imaging
Homotopic Approach for High-Fidelity Convex Low-Thrust Trajectory Optimization
Errata: Digital Beamforming on Receive: Techniques and Optimization Strategies for High-Resolution Wide-Swath SAR Imaging
Guidance Laws Based on Input-to-State Stability and High-Gain Observers
A Fast Algorithm to Solve Delay Vandermonde Systems in Phased-Array Digital Receivers
Weak Loss Convexification for Sequential Convex Programming
Long-Duration Low-Thrust Spacecraft Tracking With Sparse Optical Space Surveillance Data
Spacecraft Autonomous Rendezvous Control With Rotation Target on SE(3): Deep Reinforcement Learning Methods
HRRPSeqNet: Open-Set Recognition of Space Target Motions Using HRRP Sequences
Barrier Function-Based Three-Dimensional Guidance for Position-Constrained Interception
LEO Satellite Handover Using Advantage Actor-Critic Algorithm in Giant Constellation Network
Optimal Post-Detection Integration Techniques for the Reacquisition of Weak GNSS Signals
On measurement-based light-time corrections for bistatic orbital debris tracking
Ambiguity-Free 2-D DOA and Polarization Estimation for Mirrored Linear Crossed-Dipole Arrays
Adaptive Polarization Modulation for Subarray-Based Monopulse Radar Angular Superresolution
Parametric Rao Tests for Multichannel Adaptive Detection in Partially Homogeneous Environment
Comparison of Correlation-Based OFDM Radar Receivers
Deep-Learning-Based Direct Attitude Estimation for Uncooperative Known Space Objects
Low-Complexity, High-Precision 32-Point DFT Approximation for Multibeam Beamforming Applications
Analog maximum power point tracking for spacecraft within a low earth orbit
Feature Diversity for Optimized Human Micro-Doppler Classification Using Multistatic Radar
An Intelligent Anti-Interference Scheme for FDA-MIMO Radar Under Nonideal Condition
An Efficient Track-Before-Detect for Multi-PRF Radars With Range and Doppler Ambiguities
Resolving Doppler Ambiguity for Fast-Moving Targets With FDA-MIMO Radar
Intelligent Action Selection for NGSO Networks With Interference Constraints: A Modified Q-Learning Approach
Clutter Suppression Using Thresholded Reciprocal Filter in OFDM Radar
Target Measurement Performance of Distributed MIMO Radar Systems Under Nonideal Conditions
Bias-Reduced SDR Method for Locating a Noncooperative Moving Source Using TOAs and FOAs
Observability: Range-Only Versus Bearings-Only Target Motion Analysis When the Observer Maneuvers Smoothly
Rate Bumpless Switching Control for Turbofan Control Systems With Actuator Fault Based on Switched Models
Bias CRLB in Sine Space for a Three-Dimensional Sensor
Efficient Hierarchical Signature Scheme With Batch Verification Function Suitable for ADS-B System
Vision-Based Estimation of Airborne Target Pseudobearing Rate using Hidden Markov Model Filters
Design Heuristics and Optimization for Simple Adaptive Controllers With Applications to Spacecraft Proximity Operations
Source Localization Using Changing Rate of Phase Difference Only: A Convex Optimization Approach
Transfer Learning-Based Dual GCN for Radar Active Deceptive Jamming Few-Shot Recognition
Navigation Using Doppler Shift From LEO Constellations and INS Data
Cooperative Blind Spectrum Detection With Doolittle Decomposition and PCA-SVM Classification in Hybrid GEO-LEO Satellite Constellation Networks
Fourth-Order Buck Converter for Maximum Power Point Tracking Applications
Dual-Use Multicarrier Waveform for Radar Detection and Communication
Drogue dynamic model under bow wave in probe-and-drogue refueling
Experimental Demonstration of a Highly Doppler-Tolerant Pulsed Waveform
Spinning-Up Control of a Conical Scanning Imaging Satellite
A Hamming Distance and Spearman Correlation Based Star Identification Algorithm
Clutter Suppression in Passive ISAR Using Compressive Sensing
Autonomous Electrical Current Monitoring System for Aircraft
Consensus of Multiple Spacecraft Systems Over Switching Networks by Attitude Feedback
Cooperative Orbital Control of Multiple Satellites via Consensus
Homing Pigeon-Inspired Autonomous Navigation System for Unmanned Aerial Vehicles
A Dual-Polarization Feature Fusion Network for Radar Automatic Target Recognition Based on HRRP Sequences
Geometry Error Analysis in Solar Doppler Difference Navigation for the Capture Phase
Real-time low-complexity automatic modulation classifier for pulsed radar signals
Intelligent Robust Control of MEMS Gyroscopes With Initial-Condition-Independent Prescribed Performance
AIS-FCANet: Long-Term AIS Data Assisted Frequency-Spatial Contextual Awareness Network for Salient Ship Detection in SAR Imagery
Equivalent ARMA model representation for RLG random errors
Passive localization of moving emitters using out-of-plane multipath
An Advanced Hexacopter for Mars Exploration: Attitude Control and Autonomous Navigation
Multistage Algorithm for Single-Channel Extended-Dwell Signal Integration
Simulation of Cosmic Radiation Transport Inside Aircraft for Safety Applications
Radar PRI Modulation Recognition Under Nonideal Observations via Joint Encoding of Gramian Angular Field
One-Dimensional Constrained Coulomb Structure Control with Charge Saturations
Robust Detector Designing for FDA-MIMO Radar With Training Data in Gaussian Noise
PSE-D Model-Based Cooperative Path Planning for UAV and USV Systems in Antisubmarine Search Missions
Two Perpendicularly Colocated Cardioid Sensors of Different Cardioidicity Indices/Orders- Their Design Guidelines Based on Their Polar-Azimuthal Direction-Finding Cramér-Rao Bound
An Analytically Derived Robust Adaptive Beamformer via Interference-plus-noise Covariance Matrix Reconstruction
Analytical Evaluation of Uncertainty on Active Antenna Arrays
A Stand-Alone Approach for High-Sensitivity GNSS Receivers in Signal-Challenged Environment
Effect of Kinematics and Fluency in Adversarial Synthetic Data Generation for ASL Recognition With RF Sensors
Robust Guidance for a Reusable Launch Vehicle in Terminal Phase
Time-Correlated Window-Carrier-Phase-Aided GNSS Positioning Using Factor Graph Optimization for Urban Positioning
High Cross-Range Resolution Imaging Approach for Space Targets via CRRC and Nonuniform Resampling With Spaceborne ISAR
A Space-Time Graph Based Multipath Routing in Disruption-Tolerant Earth-Observing Satellite Networks
Constrained Trajectory Optimization With Flexible Final Time for Autonomous Vehicles
Accurate Delay Estimation for Multisensor Passive Locating Systems Exploiting the Cross-Correlation Between Signals Cross-Correlations
Probabilistically Robust Joint Transmit Code and Receive Filter Design for Extended Targets: A Mixed-Integer Programming Approach
Quickest Detection of Anomalies of Varying Location and Size in Sensor Networks
Channel-Aware Tracking in Multi-Hop Wireless Sensor Networks with Quantized Measurements
Asteroid Capture Dynamics and Control Using a Large-Scale Flexible Net
Three-Dimensional Cooperative Game Guidance Law for a Leader-Follower System With Impact Angles Constraint
Finite Dimensional Estimation Algebra for Time-Varying Filtering System and Optimal Transport Particle Filter: A Tangent Flow Point of View
Gradient-Descent-Based STDM-VSIMM Filter for Maneuvering Target Tracking
Corrections to "Robust Modeling of GNSS Tropospheric Delay Dynamics"
Sliding-Mode Control and Strategic Thrust-Vectoring Based Aircraft Flat Spin Recovery With Altitude Loss Minimization
3-D Position Optimization of Solar-Powered Hovering UAV Relay in Optical Wireless Backhaul
A Monostatic Forward-Looking Staring Spotlight SAR Raw Data Generation and Hybrid-Domain Image Formation Modifications Based on Extended Azimuth Nonlinear Chirp Scaling Autofocusing
Distributed Direct Localization Suitable for Dense Networks
Multipath Insensitive Delay Lock Loop in GNSS Receivers
Spaceborne SIMO-SAR for three-dimensional ionospheric irregularity sounding
Suboptimal Multiconstraint Configuration Programming for Underactuated Spacecraft on $SE(3)$
Fast Ambiguity Resolution for Pulsar-Based Navigation by Means of Hypothesis Testing
Development of an Aircraft Electric Power Architecture With Integrated Ground Power Unit
Multi-View Automatic Target Recognition using Joint Sparse Representation
Robust STAP of Dictionary Local Adaptive Filling and Learning for Nonstationary Clutter Suppression
Enhancing Space-Based Situational Awareness: Real-Time Observation of Dynamic Targets With Meta-Cooperative-Scheduling Net
Resource Dimensioning of Broadband Satellite Return Networks Affected by Spatially-Correlated Rain Fade
Optimal Distributed Detection of Multiple Hypotheses using Blind Algorithm
Direction-of-Arrival Estimation in Subarrays-Based Linear Sparse Arrays with Gain/Phase Uncertainties
High Resolution DOA Estimation of Coherent Distributed Millimeter-Wave Radar
Circulation Retrieval of Simulated Wake Vortices Under Rainy Condition With a Side-Looking Scanning Radar
Analysis of double-layer capacitors supplying constant power loads
Radon-Fourier Transform for Radar Target Detection (III): Optimality and Fast Implementations
Beamforming with spacecraft under reduced localization and clock constraints
Limit Cycle Analysis and Suppression for Disturbance Observer-Based Missile Autopilot With Flight Test Results
Optimal Datalink Selection for Future Aeronautical Telecommunication Networks
Sparsity-Based Processing to Enhance the Reverberation Suppression for FDA-MIMO Sonars
CFAR Based NOMP for Line Spectral Estimation and Detection
Long-Term Evolution of the Space Environment Considering Constellation Launches and Debris Disposal
Detecting Sensor Failures in TDOA-Based Passive Radars: A Statistical Approach Based on Outlier Distribution
Sparse Coding-Inspired High-Resolution ISAR Imaging Using Multistage Compressive Sensing
Deep Learning-Enabled File Popularity-Aware Caching Replacement for Satellite-Integrated Content-Centric Networks
Adaptive Rate/Power Control With ML-Based Channel Prediction for Optical Satellite Systems
Entry Guidance Based on Analytical Trajectory Solutions
Parameter-Refined OMP for Compressive Radar Imaging of Rotating Targets
Polarimetric classification of scattering centers using M-ary Bayesian decision rules
Scheduling Second-Order Computational Load in Master-Slave Paradigm
Joint THz Communication and 3-D Map Reconstruction Using Swarm UAVs for Maximum LoS Coverage
Range-Dependent Clutter Suppression for Airborne Sidelooking Radar using MIMO Technique
Unimodular Sequence Set Design With Desired Multidimensional Properties for MIMO Radar
Effect of Estimation on the Performance of an Integrated Missile Guidance and Control System