Extended Data Fig. 3: Recording of the BPF of Ingenuity’s fourth flight.
a, PSD for the entire recording (purple). The rover’s thermal pumps are shown at 195 Hz and 198.75 Hz. PSD for Sol 38a is the reference of a quiet day. b, Top, variations of the received frequency along the trajectory of the flight (diamond symbol). During the first 60 s, the recording is perturbed by high winds. In red, the Doppler effect is modelled with f = 84.44 Hz at the source and c = 237.7 m s−1. Bottom, range between the rover and Ingenuity (solid line, left y axis) and rotorcraft speed (dotted line, right y axis).
