Propagation characteristics on millimeter and quasi-millimeter waves by using three geostationary satellites of Japan
- Paper ID
1979-IAF-281
- author
- company
Kashima Branch, Radio Research Laboratories, Ministry of Posts and Telecommunications
- country
Japan
- year
1979
- abstract
The propagation experiments by using geostationary satellites, which are Engineering Test Satellite-II (ETS-II), Medium-Capacity Communication Satellite for Experimental Purposes (CS), Medium-Scale Broadcasting Satellite for Experimental Purposes (BSE) and Experimental Communication Satellite(ECS), are and will be conducted by Radio Research Laboratories (RRL) with the co-operations of National Space Development Agency of Japan (NASDA), Nippon Telegraph and Telephone Public Corporations (NTT) and Japan Broadcasting Corporations (NHK). Three of the four geostationary satellites have already been launched and are being operated satisfactorily. The ECS will be launched into the geostationary orbit in F eburuary 1980. Various and a number of propagation data by these satellites which are obtained at many places all over Japan are being accumulated. The summary of the propagation experiments concerning the main station is as follows. (a) Experimental total periods are about one year for ETS-II, and for CS, and six months for BSE in this paper. (b) The percentages of time in which measured attenuation exceed 5, 10, and 15 dB are 0.7, 0.3, and 0.15 % respectively at 34.5 GHz (ETS-II), 0.08, 0.016, and 0.008 % respectively at 19.45 GHz (CS), 0.025, 0.0025, and 0.0009 % respectively at 11.7125 GHz (BS)*, and 0.02, 0.0023, and 0.001 % respectively at 11.5 GHz (ETS-II). (c) Duration time of attenuation exceeding 30 dB at 34.5 GHz is less than 50 minutes with the occurrence probability of 0.013 % for a year period. Atteunuation exceeding 6 dB at 11.5 GHz and the one exceeding 10 dB at 19.45 GHz are 0.0025 % (8 minutes for a year) and 0.015 % (10 minutes for three months). (d) In the cumulative distributions of XPD (Cross Polarization Discrimination),values of XPD exceeding the percentages of time, 0.3, 0.1, 0.03, and 0.01 % are 25, 22, 19, and 17 dB respectively at 34.5 GHz, 28, 23, 20, and 16.5 dB respectively at 19.45 GHz and 33, 29, 26, and 24 dB respectively at 11.5 GHz. This paper presents the outline of the propagation experiments by using ETS-II, CS, .BS and ECS, and propagational characteristics of radio waves mainly above 10 GHz at the main station (Kashima Branch, RRL).