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英国国防部决定1986年6月和12月分别用航天飞机发射两颗军用通信卫星“天网4 A 和 B”。这两颗卫星是由英国航宇公司制造的。制造费与发射费为两亿英磅,卫星保险费二千至三千万英磅。最近,国防部又向该公司购买第三颗军用通信卫星“天网4C”,预定1988年发射,定点在东经53度,旨在用“天网-4 A、B、C”卫星组成一个全球通信网。主要是为英国地面部队和海军舰艇进行战略及战术通信。
The British Ministry of National Defense decided to launch two space communications satellites, Skynet 4 A and B, respectively, by space shuttle in June and December 1986. The two satellites are manufactured by British Aerospace. Manufacturing costs and launches are 200 million pounds and satellite premiums are 2-3 million pounds. Recently, the Ministry of Defense has also purchased the third military communications satellite “Skynet 4C” from the company and is scheduled to launch in 1988 at a fixed distance of 53 degrees east longitude. The aim is to form a global satellite network with “Skynet-4 A, B and C” satellites Communication network. Mainly for the British ground forces and naval ships for strategic and tactical communications.