system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Since the ISS is moving so fast, does NASA need to account for doppler shift in the radio signal? How do they account for this considering the ISS uses FM?
gpt
NASA (and all communications with fast moving satellites) use Dynamic Doppler Compensation, where the frequency of the broadcasts are adjusted progressively through the broadcast to ensure that the receiver maintains a solid signal on the correct frequency.