Accession Number : ADP006127

Title :   A Precipitation Scatter Experiment at 30 GHz,

Corporate Author : FORSCHUNGSINSTITUT DER DEUTSCHEN BUNDESPOST DARMSTADT (GERMANY F R)

Personal Author(s) : Schmiedel, Heinz ; Ochs, Alfred

Report Date : MAY 1987

Pagination or Media Count : 8

Abstract : The experiment will study scattering of microwaves at 30 GHz from precipitation, which is of importance in interference analysis and system coordination. The measurements are made in a bistatic configuration with transmit and receive sites separated by some 25 km. The propagation paths are run in a vertical plane containing the two terminal sites. Four transmitters are operated at different fixed elevations, one receiver is connected to a fixed antenna, a second one to a steerable antenna. Thus a total of eight main-beam intersections are formed, from which precipitation scatter can be received under different scatter angles and at different heights up to 10 km. Both, horizontally and vertically polarised signals are measured. In addition, a line-of-sight link and a rain-scatter link are operated in a situation close to those of actual communication links, a further 100-km path is run at 30 GHz. The main objective of the experiment are: Studies of direct relevance to system design and coordination: long-term statistics of transmission loss in various interference configurations, Significance of backscatter in relation to forward scatter, influence of the melting layer, scattering from ice crystals up to a height of 10 km, power density spectra and fading rate of the scattered signal.

Descriptors :   *ELECTROMAGNETIC SCATTERING, *ATMOSPHERIC PRECIPITATION, HYDROMETEORS, SUPERHIGH FREQUENCY, BISTATIC RADAR, MICROWAVES, BACKSCATTERING, FORWARD SCATTERING, ICE, WATER, LAYERS, SYMPOSIA, WEST GERMANY.

Subject Categories : Radiofrequency Wave Propagation
      Electricity and Magnetism
      Active & Passive Radar Detection & Equipment
      Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE