History of the US high-altitude SIGINT system

Following our previous article Signal intelligence 101: SIGINT targets, which described what kind of intelligence the USA could collect by targeting a variety of Soviet electronic emitters, Rob1 and I assembled an history of the high-altitude satellites which performed the collection. In the same fashion as History of the US reconnaissance system, which focused on… Continue reading History of the US high-altitude SIGINT system

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Signal intelligence 101: SIGINT targets

In order to start a series of articles about the American signal intelligence satellites, written with guest author Rob1, I thought it could be interesting to give some background on what those satellites listen to. So here is a quick overview of the various types of signal intelligence targets, with an emphasis on the Cold… Continue reading Signal intelligence 101: SIGINT targets