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A SIGINT Activity Designator (or SIGAD) identifies a signals intelligence (SIGINT) line of collection activity associated with a signals collection station, such as a base or a ship. For example, the SIGAD for Menwith Hill in the UK is USD1000.〔(【引用サイトリンク】url=http://www.duncancampbell.org/menu/surveillance/echelon/IC2001-Paper1.pdf )〕 SIGADs are used by the signals intelligence agencies of the United States, the United Kingdom, Canada, Australia and New Zealand.〔Top Level Telecommunications: (SIGINT Activity Designators )〕 There are several thousand SIGADs including the substation SIGADs denoted with a trailing alpha character. Several dozen of these are significant.〔(【引用サイトリンク】title=Ragtime: Code name of NSA’s Secret Domestic Intelligence Program Revealed in New Book )〕 The leaked Boundless Informant reporting screenshot showed that it summarized 504 active SIGADs during a 30-day period in March 2013. ==General Format== A SIGAD consists of five to eight case insensitive alphanumeric characters.〔(【引用サイトリンク】title=ACP 133 Common Content and LDAP )〕 It takes the general form of an alphanumeric designator normally composed of a two- or three-letter prefix followed by one to three numbers. Often a dash is used to separate the alphabetic and numeric characters in the primary part of the designator, but less frequently a space is used as a separator or the alphabetic and numeric characters are concatenated together. An additional alphabetic character can be added to denote a sub-designator for a subset of the primary unit, such as a detachment. Lastly, a numeric character can be added after the aforementioned alphabetic to provide for a sub-sub-designator. In the examples below an X represents an alphabetic character and an N represents a numeric character that are part of the primary designator. Likewise, an x represents an alphabetic character and an n represents a numeric character that are part of a sub-designator. Here are valid generalized examples of SIGADs: The first two characters show which country operates the particular SIGINT facility, which can be US for the United States, UK for the United Kingdom, CA for Canada, AU for Australia and NZ for New Zealand. A third letter shows what sort of staff runs the station. SIGADs beginning with US without a third letter are used for intercept facilities run by the NSA.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「SIGINT Activity Designator」の詳細全文を読む スポンサード リンク
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