Accession Number:

ADA055397

Title:

Analysis of Single and Multiple Wavelength Radar Systems for Estimating Slant Path Attenuation Through Rain and Cloud at Frequencies Greater than 10 GHz.

Descriptive Note:

Final rept. 1 Dec 76-30 Sep 77,

Corporate Author:

JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB

Personal Author(s):

Report Date:

1978-03-01

Pagination or Media Count:

127.0

Abstract:

The feasibility of using various types of radars including dual wavelength configurations for arriving at slant path attenuations through rain and cloud at frequencies up to 100 GHz has been analyzed. Optimum performance parameters of systems which best perform these functions are established. The configurations examined include single S-band f 3 GHz and K sub u-band f 15.7 GHz systems as well as dual wavelength systems operating at K sub a-S 35-3 GHz and K sub u-S 15.7-3 GHz bands. The following conclusions have been arrived at from the analysis of the above systems 1 Of the various systems examined, the most straightforward is an S-Band system monitoring the path reflectivity profiles. 2 The use of a single attenuation wavelength radar e.g., one operating at 15.7 GHz for measuring rain path attenuation leads to unacceptably high errors and should be avoided. 3 A radar system operating at 15.7 GHz is suitable for estimating cloud liquid water content from which cloud path attenuation may be determined at frequencies above 10 GHz. 4 A dual wavelength system involving K sub a and S-band 35-3 GHz radar system is feasible for establishing drop size distributions aloft from which appropriate empirical relations at higher frequencies may be generated. 5 A K sub u-S band 15.7-3 GHz dual wavelength system may give rise to unacceptably large errors and its use should be avoided. Author

Subject Categories:

  • Meteorology
  • Active and Passive Radar Detection and Equipment
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE