Receiving US Nuclear Detection Satellite Signals with RTL-SDR, Discovery Dish and Discovery Drive (opens in new tab)

Over on the Saveitforparts YouTube channel, Gabe has documented how he accidentally discovered signals coming from the GPS-satellite-based US nuclear detection system. While scanning the GPS L3 frequency around 1381 MHz with his RTL-SDR, Discovery Dish, 1420 MHz Hydrogen line Discovery Dish feed, and Discovery Drive, Gabe caught short intermittent data bursts instead of the usual navigation signals. It turns out L3 is used by the GPS constellation for nuclear detonation detection, as the sate...