Calculate the target Doppler frequency shift measured by a pulse-Doppler radar.
A radar system operates at a carrier frequency of 10 GHz (X-band). The function must calculate the Doppler frequency produced by an aircraft moving relative to the radar.
The input parameters are:
  • the target motion direction: "closing" if the aircraft is approaching the radar, or "receding" if the aircraft is moving away from the radar;
  • the magnitude of the radial velocity of the aircraft in m/s (a positive value).
Assume the speed of light is c = 299792458 m/s.
The output must be the Doppler frequency shift in Hz, rounded to two decimal places.
A positive Doppler frequency corresponds to an approaching target, while a negative Doppler frequency corresponds to a receding target.
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Last Solution submitted on Jul 30, 2026

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