Spectral method for numerical calculation of derivatives in digital processing of subsurface radar sounding signals

Abstract

The practical realization of the morphologic analysis of radar subsurface as the processing of input digital data is presented here together with real data processing results. The analysis depends on a new numerical differentiation algorithm in frequency domain. It is compared with a central finite differences scheme and results of computations demonstrate approximately 80‐times decrease of the maximum errors.

Straipsnyje nagrinejama radaro popaviršutiniu signalu skaitinio duomenu apdorojimo morfologines analizes praktine realizacija, kai skaitiniai duomenys apdorojami kartu su realiais duomenimis. Analize remiasi skaitinio deferenciavimo algoritmu dažniu srityje. Ji lyginama su centrine baigtiniu skirtumu schema ir demonstruoja vidutiniškai 80 kartu mažesne skaičiavimo paklaida.3

Key words:

• numerical differentiation
• central finite differences scheme
• spectral method
• subsurface radar
• digital signal processing