60 Years of DARPA's Favorite Toys
This year, the U.S. Defense Advanced Research Projects Agency (DARPA) turned 60. To celebrate, DARPA held a conference in Washington, D.C. One of the highlights was an exhibit hall full of both current DARPA programs as well as unique artifacts from DARPA's history. We've put together a gallery of the most interesting things we saw there. If you'd like to see more, DARPA also published a 140-page retrospective on what they've been up to over the last half century, which you can download here [PDF].
Before there was GPS, there was Transit, a satellite navigation system developed by DARPA and Johns Hopkins University’s Applied Physics Lab for Polaris ballistic missile submarines. Operational from the 1960s through the mid-1990s, ground receivers used the Doppler shift of the satellite's signal to calculate their location within a few tens of meters. Transit was one of the earliest space-related activities that DARPA participated in.
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