scholarly journals Application of Digital Filters to Check Quality of the Automatically Scaled Ionograms

2015 ◽  
Vol 66 (3) ◽  
pp. 164-168 ◽  
Author(s):  
Luboš Rejfek ◽  
Zbyšek Mošna ◽  
Daniel Kouba ◽  
Josef Boška ◽  
Dalia Burešová
Keyword(s):  
Impulse Response ◽  
Digital Filters ◽  
Finite Impulse Response ◽  
The State ◽  
Simple Method ◽  
Automatic Scaling ◽  
Finite Impulse Response Filters ◽  
Basic Characteristics ◽  
Impulse Response Filters

Abstract The ionospheric observatory Pruhonice serves to monitor the state of ionosphere using ground-based vertical sounding instrument - the Digisonde DPS-4D. Measured ionograms are automatically evaluated (scaled) and basic characteristics are derived. The ionograms and the scaled parameters are sent to the international databases. Especially during disturbed conditions the automatic scaling could give unreliable results. This paper presents simple method how to detect accidental errors in automatic scaling based on the parameters derived from ionograms and on an application of the finite impulse response filters.

Theory of the Design, and Operation of Digital Filters

2021 ◽  
pp. 797-823
Author(s):  
Stevan Berber
Keyword(s):  
Impulse Response ◽  
Digital Filters ◽  
Finite Impulse Response ◽  
Transformation Method ◽  
Infinite Impulse Response ◽  
Bilinear Transformation ◽  
Finite Impulse Response Filters ◽  
Infinite Impulse Response Filters ◽  
Basic Characteristics ◽  
Impulse Response Filters

Chapter 16 present the theoretical basis for digital filters, including issues related to their design. The basic characteristics and structures of finite impulse response and infinite impulse response filters are presented and discussed. In addition, the ideal and practical transfer characteristics of the digital filters are defined. The basic advantage of finite impulse response filters is that they can be designed to have an exact linear phase. However, infinite impulse response filters are generally more efficient computationally. The methods for filters design and related algorithms, which are based on the bilinear transformation method, windowed Fourier series, and algorithms based on iterative optimization, are also presented.

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