Propagation time measurements with a troposcatter link at 0.9 and 4.5 GHz
Abstract
The paper reports on impulse-response measurements of a 280 km troposcatter link which have been performed at frequencies of 907 MHz (UHF) and 4.5 GHz (C-band). It is reported that time resolution was 0.1 micro sec corresponding to 10 MHz signal bandwidth. It is found that the delay spread ranges between 0.3 and 0.5 micro sec at UHF and between 0.15 and 0.25 micro sec at C-band, noting that these spreads are wider than those calculated with the WSSUS-scattering model. In addition, the shape of the DPS varies from the theoretical depending on meteorological conditions, and aircraft reflections are still noticeable outside the 3dB-common volume. Finally, a statistical dependency between amplitude variation of the broadband signal level normalized to the mean level and the delay spread in terms of number of paths is established and experimentally confirmed.
- Publication:
-
Kleinheubacher Berichte
- Pub Date:
- 1980
- Bibcode:
- 1980KlBer..23...41S
- Keywords:
-
- Data Links;
- Microwave Transmission;
- Propagation Velocity;
- Tropospheric Scattering;
- Amplitudes;
- C Band;
- Channels (Data Transmission);
- Power Spectra;
- Reception Diversity;
- Ultrahigh Frequencies;
- Communications and Radar