Now showing items 1-14 of 14

  • Band-monitoring Payload for a CubeSat Satellite 

    Vagner, P.; Urbanec, T.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2012-04)
    During changing sun activity, the ionosphere is responding accordingly and therefore it is interesting to observe the propagation behavior of shortwave bands. For the above mentioned purpose we have designed a band-monitoring ...
  • Bandpass Signal Processing 

    Halamek, J.; Kasal, M.; Villa, M.; Cofrancesco, P. (Společnost pro radioelektronické inženýrství, 1997-04)
    We present the bandpass signal analysis based on digital receiver and call attention to the aliasing of the complex signal, the digital quadrature detector when sampling is equal to quadruple of the carrier frequency, and ...
  • Effective DSP Methods of PSK Feedback Timing Synchronization 

    Sebesta, J.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2005-09)
    This paper deals with simplification and improvement of data timing synchronization algorithms. Timing error synchronizers are usually the most complicated subsystems in the demodulator, and limit the DSP technique used ...
  • Efficient Spectral Power Estimation on an Arbitrary Frequency Scale 

    Zaplata, F.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2015-04)
    The Fast Fourier Transform is a very efficient algorithm for the Fourier spectrum estimation, but has the limitation of a linear frequency scale spectrum, which may not be suitable for every system. For example, audio and ...
  • Experimental Satellite Phase 3D before Launch 

    Kasal, M.; Sebesta, J. (Společnost pro radioelektronické inženýrství, 1999-04)
    To build a satellite can be a dream for many engineers. We are happy that we can participate in the AMSAT PHASE 3D project. Our responsibility is very high because one of our on-board receivers is the main one of the command ...
  • The Low Rate Telemetry Transmission Simulator 

    Spacek, J.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2007-12)
    The presented paper is dedicated to the low rate telemetry transmission simulator. The basic concept of the system uses the carrier (DSB) and subcarrier (BPSK). The research is focused on the AWGN and carrier phase noise ...
  • The Model of the Low Rate Telemetry Communication System for Matlab-Simulink 

    Spacek, J.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2012-06)
    This article is dedicated to the model of low rate telemetry system, which has been developed for Matlab-Simulink environment. The purpose of this model is a research of the low rate telemetry transmission reliability in ...
  • Modeling of the Phase Noise in Space Communication Systems 

    Baran, O.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2010-04)
    Our work is focused on the investigation of an influence of an additive thermal noise and a multiplicative phase noise in space communication chains. The most important properties of both noise types are summarized. The ...
  • Modeling of the Simultaneous Influence of the Thermal Noise and the Phase Noise in Space Communication Systems 

    Baran, O.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2010-12)
    Our work deals with studies of a noise behavior in space communication systems. Two most important noise types the additive thermal noise and the multiplicative phase noise, respectively, are included. A simple model of ...
  • A Novel Bandpass Filter Using a Combination of Open-Loop Defected Ground Structure and Half-Wavelength Microstrip Resonators 

    Vagner, P.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2010-09)
    This paper deals with a defected ground structure (DGS) open-loop resonator analysis and bandpass filter design, using coupled DGS and microstrip resonators. The combination of DGS and microstrip resonators allows using ...
  • Novel Optimization Method of Active Frequency Multiplier Utilizing Harmonic Terminating Impedances with DGS 

    Kutin, P.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2006-06)
    A novel method for the optimization of the active frequency multiplier utilizing the harmonic terminating impedances with the defected ground structures (DGS) has been developed. Furthermore, a new type of the low-pass ...
  • A Simple Method of Measuring the Noise Figure of the NMR Spectometer 

    Kasal, M.; Husek, V.; Halamek, J. (Společnost pro radioelektronické inženýrství, 1993-07)
    Sensitivity is one of the fundamental parameters of the Nuclear Magnetic Resonance experiment. It depends particularly on the coil and impedance matching of the resonance circuit of the probe to the input amplifier. However, ...
  • Software Defined DCF77 Receiver 

    Zaplata, F.; Kasal, M. (Společnost pro radioelektronické inženýrství, 2013-12)
    This paper shows the solution of time stamp software defined receiver integration into low cost com-mercial devices. The receiver is based on a general pur-pose processor and its analog to digital converter. The amplified ...
  • Static and Dynamic Nonlinearity of A/D Converters 

    Halamek, J.; Viscor, I.; Kasal, M.; Villa, M. (Společnost pro radioelektronické inženýrství, 2005-04)
    The dynamic range of broadband digital system is mostly limited by harmonics and spurious arising from ADC nonlinearity. The nonlinearity may be described in several ways. The distinction between static and dynamic ...