Boguslaw Szlachetko

Bio: Boguslaw Szlachetko is an academic researcher from Wrocław University of Technology. The author has contributed to research in topics: Fuzzy logic & Filter bank. The author has an hindex of 7, co-authored 39 publications receiving 127 citations. Previous affiliations of Boguslaw Szlachetko include ESIEE Paris.

Fuzzy flight control system for helicopter intelligence in hover

Abstract: This paper relates to a fuzzy flight control system in spot hovering for a single-rotor helicopter PZL Kania. The model of the fuzzy control system was developed on the basis of computer simulation experiments done by the expert's analysis (pilot's knowledge). The helicopter's mathematical model and its fuzzy flight control system were simulated using Matlab software package. In a series of numerous computer simulations the operation of the fuzzy control system was investigated and the system itself was tuned up. Simulation tests have been performed for the helicopter both in fixed hovering, and in hovering with disturbances. Disturbances were related to a gust of wind or to an accidental motion of one of the rudders. Obtained results give the good promise for building the Web simulator.

Toward Wide-Band High-Resolution Analog-to-Digital Converters Using Hybrid Filter Bank Architecture

Abstract: The paper presents the problem of design and simulation of a high-speed wide-band high-resolution analog-to-digital (ADC) converter working in a bandpass scenario. Such converters play a crucial role in software-defined radio and in cognitive radio technology. One way to circumvent the limits of today's ADC technologies is to split the analog input signal into multiple components and then sample them with ADCs in parallel. The two main split approaches, time interleaved and frequency splitting, can be modeled using a filter bank paradigm, where each of these two architectures requires a specific analysis for its design. In this research, the frequency splitting approach was implemented with the use of a hybrid filter bank ADC, which requires an output digital filter bank perfectly matched to the input analog filter bank. To achieve this end, an analog transfer function, together with an assumption of strictly band-limited input signal, has been used to design the digital filter bank so far. In contrast, the author proposes dropping the band-limit assumption and shows that the out-of-band input signal has to be taken into account when designing a hybrid filter bank.

On quadrotor navigation using fuzzy logic regulators

Abstract: In this paper the cascaded fuzzy controller system for quadrotor steering and stabilizing was deliberated. The mathematical model of quadrotor and its cascaded fuzzy controller were simulated using Matlab Simulink software. The fuzzy system was divided into three subsystems for controlling position and speed of the quadrotor and for steering rotation speed of propellers. In the article the square trajectory of quadrotor flight was presented as a system test.

Bayesian separation algorithm of THz spectral sources applied to D-glucose monohydrate dehydration kinetics

Abstract: An estimation of the dehydration kinetics of monohydrated D -glucose with the use of the Bayesian spectral source separation algorithm is described. The dehydration experiment was probed with the terahertz time domain spectroscopy (THz-TDS). Contrary to the widely used peak-area method, our approach to the quantitative analysis takes into account the full spectral information. The obtained concentration profiles at different temperatures were processed in order to measure the kinetics of the dehydration process. Our investigation shows that the proposed method may be used to estimate the evolution of concentration despite the overlapping peaks and multiple spectral sources in the observed spectra.

Stabilisation and steering of quadrocopters using fuzzy logic regulators

Abstract: The cascaded fuzzy controller system for quadrocopter was developed on the basis of computer simulations The mathematical model of quadrocopter and its cascaded fuzzy controller were simulated using Matlab Simulink software The proposed controller was tested in most frequent flight circumstances: in hover, in rectilinear flight with constant speed, in climbing and in rotation In all these situations the proposed controller was able to provide foreseeable behavior of the quadrocopter

数字信号处理 = Understanding digital signal processing

Abstract: From the Publisher: This is undoubtedly the most accessible book on digital signal processing (DSP) available to the beginner. Using intuitive explanations and well-chosen examples, this book gives you the tools to develop a fundamental understanding of DSP theory. The author covers the essential mathematics by explaining the meaning and significance of the key DSP equations. Comprehensive in scope, and gentle in approach, the book will help you achieve a thorough grasp of the basics and move gradually to more sophisticated DSP concepts and applications.

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Abstract: With the non-ionizing, non-invasive, high penetration, high resolution and spectral fingerprinting features of terahertz (THz) wave, THz spectroscopy has great potential for the qualitative and quantitative identification of key substances in biomedical field, such as the early diagnosis of cancer, the accurate boundary determination of pathological tissue and non-destructive detection of superficial tissue. However, biological samples usually contain various of substances (such as water, proteins, fat and fiber), resulting in the signal-to-noise ratio (SNR) for the absorption peaks of target substances are very small and then the target substances are hard to be identified. Here, we present recent works for the SNR improvement of THz signal. These works include the usage of attenuated total reflection (ATR) spectroscopy, the fabrication of sample-sensitive metamaterials, the utilization of different agents (including contrast agents, optical clearing agents and aptamers), the application of reconstruction algorithms and the optimization of THz spectroscopy system. These methods have been proven to be effective theoretically, but only few of them have been applied into actual usage. We also analyze the reasons and summarize the advantages and disadvantages of each method. At last, we present the prospective application of THz spectroscopy in biomedical field.

A review of quadrotor UAV: control methodologies and performance evaluation

Abstract: Quadrotor a kind of multirotor unmanned air vehicle has gained popularity within research community due to its high manoeuvrability, vertical take-off, landing and hovering capability, and ease of operation in areas where traditional unmanned air vehicle have proved ineffective. This article provides a comprehensive survey of research methodologies proposed for quadrotor control. The methodologies are categorised into three different control design domains and each methodology is discussed in detail. Finally, we discuss the evaluation criteria used for the aforementioned methodologies and highlight the potential challenges that still need to be addressed in quadrotor control domain.

Short range ultrasonic communications in air using quadrature modulation

Abstract: A study has been undertaken of ultrasonic communications methods in air, using a quadrature modulation method. Simulations were first performed to establish the likely performance of quadrature phase shift keying over the limited bandwidth available in an ultrasonic system. Quadrature phase shift keying modulation was then implemented within an experimental communication system, using capacitive ultrasonic sources and receivers. The results show that such a system is feasible in principle for communications over distances of several meters, using frequencies in the 200 to 400 kHz range.

Autonomous flying with quadrocopter using fuzzy control and ArUco markers

Abstract: In this paper, we present an approach which enables a low-cost quadrocopter to fly various trajectories autonomously. Artificial landmarks are used for pose estimation, and a fuzzy controller is utilized to generate steering commands. The presented system can navigate a low-cost quadrocopter along a predefined path without the need for any additional external sensors. In addition to a full description of our system, we also introduce our software package for Robot Operating System, which allows the robotics community to experiment with proposed mapping algorithm.