Title :
A mobile 12 GHz DBS television receiving system
Author :
Ito, Yasuhiro ; Yamazaki, Shigoru
Author_Institution :
Nippon Koso Kyokai, Tokyo, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
A practical, mobile, 12-GHz direct broadcast satellite (DBS) television receiving system for receivers on vehicles is described. The system is housed in a cylindrical radome of 350 mm height and 862 mm diameter, and it weighs 50 kg. Two pairs of high performance flat-panel antenna units (640*180 mm each) are used to reduce the system. For rapid recatch of DBS, antenna control is based on a gyroscope that is corrected using a phase-comparison monopulse. To simplify the system, the antenna units and receivers are used for antenna tracking as well as signal reception. The antenna units are in-phase combined to allow electronic tracking, which reduces the influence of pointing error caused by vibration of vehicles. The system maintains a reception rate of more than 90% on expressways.<>
Keywords :
antenna phased arrays; direct broadcasting by satellite; microwave antenna arrays; mobile antennas; receiving antennas; television antennas; television receivers; television systems; 12 GHz; 350 mm; 862 mm; DBS television receiving system; SHF; adaptive antenna array; antenna control; antenna tracking; cylindrical radome; diameter; direct broadcast satellite; electronic tracking; flat-panel antenna units; gyroscope; height; mobile system; phase-comparison monopulse; pointing error; signal reception; vehicles vibration; Directive antennas; Laboratories; Mobile antennas; Radio broadcasting; Receivers; Receiving antennas; Satellite broadcasting; TV broadcasting; Tellurium; Vehicles;
Journal_Title :
Broadcasting, IEEE Transactions on
