training course on weather radar systems - RTC, Regional Training ...
training course on weather radar systems - RTC, Regional Training ...
training course on weather radar systems - RTC, Regional Training ...
- No tags were found...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
MODULE A- INTRODUCTION TO RADAR<br />
C= δθ/ δS = 2π/2πR=1/R<br />
For a <strong>radar</strong> ray travelling relative to the earth when there is a n<strong>on</strong>-uniform atmosphere present,<br />
the ray will bend more or less relative to the earth, depending up<strong>on</strong> how much the refractive<br />
index changes with height. Then;<br />
C= δθ/ δS=1/R + δn/ δH<br />
It is sometimes c<strong>on</strong>venient to think of the <strong>radar</strong> rays travelling in straight lines instead of the<br />
actual curved paths they do follow. We can accomplish this by creating a fictitious earth radius is<br />
different from the true earth’s radius. This effective earth’s radius R’ is given by<br />
1/R’=1/R + δn/ δH<br />
There are various relati<strong>on</strong>ships between curvature, earth’s radius, effective earth’s radius, and<br />
refractive index gradient. So it is possible to calculate the actual path a <strong>radar</strong> ray will follow in<br />
real atmospheric c<strong>on</strong>diti<strong>on</strong>s.<br />
4. RADAR TYPES<br />
Radars may be classified in several ways due to the criteria of the classificati<strong>on</strong>, e.g. receiving<br />
and transmitting type, purpose of the use, operating frequency band, signal emitting type (pulse-<br />
CW), polarizati<strong>on</strong> type. It is also possible to make sub classificati<strong>on</strong>s under the main<br />
classificati<strong>on</strong> of <strong>radar</strong>s. So major types of <strong>radar</strong>s have been denominated as m<strong>on</strong>ostatic, bistatic,<br />
pulse, c<strong>on</strong>tinuous (CW), Doppler, n<strong>on</strong>-Doppler, <strong>weather</strong> <strong>radar</strong>, air surveillance <strong>radar</strong>, mobile<br />
<strong>radar</strong>, stati<strong>on</strong>ary <strong>radar</strong>, X-Band, L-Band, C-Band, S-Band, K-Band, single polarizati<strong>on</strong> <strong>radar</strong>s,<br />
polarimetric <strong>radar</strong>s, etc. Although our main c<strong>on</strong>cern is Doppler <strong>weather</strong> <strong>radar</strong>s which will be<br />
studied in detail, some brief explanati<strong>on</strong> of major types of the <strong>radar</strong>s are also given below:<br />
34<br />
TURKEY RADAR TRAINING 1.0 / ALANYA 2005