|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.38 [2009] >
IJRSP Vol.38(2) [April 2009] >
| Title: | Raindrop size distribution profiling by laser distrometer and rain attenuation of centimeter radio waves |
| Authors: | Saikia, M
Devi, M
Barbara, A K
Sarmah, H K |
| Keywords: | Raindrop size distribution (RSD)
Rain attenuation
Rain rate
Centimeter radio wave |
| Issue Date: | Apr-2009 |
| Publisher: | CSIR |
| PACS No.: | 92.40.eg |
| Abstract: | The paper describes system design of laser distrometer, its calibration process and profiling of raindrop size distribution (RSD). Here, raindrop signature is extracted by allowing the drops to pass through a controlled field of view of a sensor. A laser beam works as signal source, phototransistor as detector-cum-amplifier and optical fibers as trans-receiving ports. RSD profiles and rain rate at different weather conditions have been presented. Specific raindrop attenuation of line of sight radio signals at 10 - 30 GHz of various drop diameters is then calculated by using standard attenuation equations and model values of scattering functions. Finally, the rain attenuation magnitudes are compared with those given by a model framed earlier [Timothy K I, Sharma S, Devi M & Barbara A K, Model for estimating rain attenuation in frequencies range 5-30 GHz, Electron Lett (UK), 31 (17) (1995)]. |
| Page(s): | 80-85 |
| ISSN: | 0367-8393 |
| Source: | IJRSP Vol.38(2) [April 2009]
|
|
