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Tracking and data relay satellite system

network of communications satellites and ground stations used

Pronunciation
/ˈtrakɪŋ ənd ˈdeɪtə rɪˈleɪ ˈsatəlʌɪt ˈsɪstəm/
/ˈtrækɪŋ ænd ˈdædə ˈriˌleɪ ˈsædlˌaɪt ˈsɪstəm/