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1
Content available remote

An Analysis of a Mutual Capacitance οf SAW Periodic Strips Having Different Metallization Ratio

100%
Kawalec A.
Acta Physica Polonica A
|
2008
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vol. 114
|
issue 6A
A-139-A-142
EN
The analytical expression for mutual capacitance of periodic strips is presented in this paper. This expression utilizing the spectral theory is obtained. It is studied how the metallization ratio affects a mutual capacitance of periodic strips. The mutual capacitance of periodic strips as a function of metallization ratio, for split electrodes, was shown in the paper. This approach should be applicable to modeling of the surface acoustic waves interdigital transducers.
2
Content available remote

Fractal Features of Specific Emitter Identification

64%
Dudczyk J., Kawalec A.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 3
406-409
EN
This article presents the issues connected with emitter sources identification with low distinctive primary features of a signal. It is a specific type of identification called specific emitter identification, which distinguishes different copies of the same type of emitter. The term of specific emitter identification was presented on the basis of fractal features received from the transformation of measurement data sets. The use of linear regression and Lagrange polynomial interpolation resulted in the estimation of measurement function. The method analysing properties of measurement function which was suggested by the authors caused the extraction of two additional distinctive features. The features above extended the vector of basic radar signals' parameters. The extended vector of radar signals' features made it possible to identify the copy of emitter source.
3
Content available remote

Modification of a Weighting Function for NLFM Radar Signal Designing

64%
Leśnik C., Kawalec A.
Acta Physica Polonica A
|
2008
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vol. 114
|
issue 6A
A-143-A-149
EN
Modification of the weighting raised cosine with a power n function by time convolution with auxiliary changeable time duration uniform rectangular window is presented in this paper. The analytical form of the modified weighting raised cosine function for fixed power in frequency domain was derived. Proposed method was applied to fine tuning of properties of the nonlinear frequency modulation of radar signals. Synthesis of nonlinear frequency modulation radar signals problem was solved using the well-known principle of stationary phase. The selected testing results are shown and some final conclusions are formulated.
4
Publication available in full text mode
Content available

Specific emitter identification based on graphical representation of the distribution of radar signal parameters

64%
Dudczyk J., Kawalec A.
|
2015
|
issue 2
5
Publication available in full text mode
Content available

Fast-decision identification algorithm of emission source pattern in database

64%
Dudczyk J., Kawalec A.
|
2015
|
issue 2
6
Publication available in full text mode
Content available

Type of modulation identification using Wavelet Transform and Neural Network

64%
Walenczykowska M., Kawalec A.
|
2016
|
issue 1
7
Publication available in full text mode
Content available

Optimizing the minimum cost flow algorithm for the phase unwrapping process in SAR radar

64%
Dudczyk J., Kawalec A.
|
2014
|
issue 3
8
Publication available in full text mode
Content available

Identification of emitter sources in the aspect of their fractal features

64%
Dudczyk J., Kawalec A.
|
2013
|
issue 3
9
Content available remote

The Numerical Synthesis of a Radar Signal Based on Iterative Method

51%
Lesnik C., Kawalec A., Szugajew M.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 4
693-697
EN
This paper presents the impact of numerical methods used to solve the problem of synthesis of signals modulated in frequency with an autocorrelation function that implements an optimal approximation to a given autocorrelation function. After theoretical introduction an algorithm of frequency modulated signal synthesis is presented. Simulation results made in Matlab are presented in the last section.
10
Publication available in full text mode
Content available

Azimuth ambiguity suppression in SAR images using Doppler-sensitive signals

51%
Leśnik C., Serafin P., Kawalec A.
|
2015
|
issue 1
11
Publication available in full text mode
Content available

A correction in feedback loop applied to two-axis gimbal stabilization

51%
Zych C., Wrońska-Zych A., Dudczyk J., Kawalec A.
|
2015
|
issue 1
12
Content available remote

The Radar Ambiguity Function Application for the Frequency Modulated Signals Designing

51%
Kawalec A., Ziołkowski C., Leśnik C., Pietrasinski J.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 3
335-339
EN
The optimization of the transmitted signal time-frequency structure is the very important part of the radar system design from the point of view of the radar system effectiveness. In this meaning the radar ambiguity function is the basic tool used for the radar system features testing. The synthesis procedure of the signal with simultaneous amplitude and phase manipulation is presented in the paper. The procedure is based on the Zak transform that is connected with the radar ambiguity function. The Legendre polynomials were applied in the procedure mentioned above. The results of the simulation tests are presented as examples of the consideration main effects.
13
Content available remote

The Numerical Synthesis of a Radar Signal Having Required Autocorrelation Function

51%
Leśnik C., Kawalec A., Szugajew M.
|
|
issue 6
1194-1198
EN
This paper presents the problem of synthesis of signals modulated in frequency with autocorrelation function that implements an optimal approximation to a given autocorrelation function. After theoretical introduction an algorithm of frequency modulated signal synthesis is presented. Simulation results made in Matlab are presented in the last section.
14
Content available remote

Determination of Electromagnetic Emitter Position from Passive Radar Bearings as Linear Least Squares Problem

51%
Kawalec A., Kojdecki M., Wajszczyk B.
|
EN
Mathematical formulation of an inverse problem of radiolocation is discussed. Determination of electromagnetic emitter position from passive radar bearings is transformed into a linear least squares problem and equivalent system of normal equations. Eventually spatial localisation of emitter is reduced to solving system of linear algebraic equations with entries of coefficient matrix and free term depending on bearings in a nonlinear way. Regularisation algorithm is proposed.
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