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Design and Construction of Extracting Circuit | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 12, Issue 1, 2008, Pages 23-29 | ||
| Authors | ||
| Bahea Ahamed Alwan; Wijdan Karam Salim; Sabah Abdul-Hassan Gitaffa | ||
| Abstract | ||
| The principle of radar echo analysis for extracting the Doppler signal of moving echoes (eliminating fixed echoes) is based on the use of a sampler associated with a hold capacitor followed by a band-pass filter. The filter cut-off frequencies are chosen as a function of the types of targets to be detected. The fast filter has a pass-band from 190 Hz to 1800 Hz. These frequencies correspond to Fast targets having radial velocities of between approximately 10 Kph and 200 Kph. The slow filter has a pass-band from 60 Hz to 230 Hz. these frequencies corresponding to slower targets. Whose radial velocities lay between approximately 3.5 Kph and 13 Kph. The | ||
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