Satellite Data System

The current SDS-3 constellation, consisting of three Molniya orbit type and two geostationary satellites

Releasable Picture of NRO satellite, possible SDS-1

The SDS 3-4 satellite (USA 179, 2004-034A) created a tiny trail perpendicular to the star trails in this 10 second exposure with a Zeiss Sonnar MC 2.8/180mm lens made by amateur satellite observer Marco Langbroek

The Satellite Data System (SDS) is a system of United States military communications satellites. At least three generations have been used: SDS-1 from 1976 to 1987; SDS-2 from 1989 to 1996; SDS-3 from 1998 to the present. It is believed that these satellites were known by the code name Quasar. The first generation were named simply 'SDS', the second generation were named 'Quasar' and the third generation each carried their own designation names.

单词	Satellite Data System
释义	Satellite Data System 英语百科 Satellite Data System The Satellite Data System (SDS) is a system of United States military communications satellites. At least three generations have been used: SDS-1 from 1976 to 1987; SDS-2 from 1989 to 1996; SDS-3 from 1998 to the present. It is believed that these satellites were known by the code name Quasar. The first generation were named simply 'SDS', the second generation were named 'Quasar' and the third generation each carried their own designation names.
随便看	local attached的意思 local attached support processor的意思 Local attachment.的意思 local attack的意思 local attenuation的意思 Local attraction的意思 local attribute的意思 local audio alarm的意思 local audit office的意思 local audit organization的意思 local authentication的意思 Local Authorities的意思 local authorities management information system的意思 Local Authority的意思 local authority bond的意思 local authority borrowing的意思 local authority escalator的意思 local authority escalator loan的意思 local authority loans的意思 local authority market的意思 local authority mutual loan的意思 local authority mutual loans的意思 local authority yearly bond的意思 local automatically operated的意思 local automatically operated unit的意思