Canyon SIGINT satellites were in use during the same period as Aquacade satellites with an apparently different set of capabilities.
Sources
- Aquacade (satellite) (en.wikipedia.org)
- https://space.skyrocket.de/doc_sdat/rhyolite.htm (space.skyrocket.de)
- https://military-history.fandom.com/wiki/Aquacade_(satellite) (military-history.fandom.com)
- https://www.projectblackecho.com/declassified/black-projects/project-rhyolite-geostationary-signals-intelligence-program (projectblackecho.com)
- https://satelliteobservation.net/2017/07/31/history-of-the-us-high-altitude-sigint-system/ (satelliteobservation.net)
- https://www.globalsecurity.org/space/systems/canyon.htm (globalsecurity.org)
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