Single-tone signal power accuracy improving method based on FFT analysis

The invention discloses a single-tone signal power accuracy improving method based on FFT (Fast Fourier Transform) analysis, which comprises the following steps of: respectively performing windowing and frequency detection on a single-tone signal, and performing windowing on the single-tone signal to obtain a frequency spectrum of a window function after the single-tone signal is windowed; performing frequency detection on the single-tone signal to obtain the frequency of the single-tone signal; obtaining the leakage amount of the single-tone signal on the nearest subcarrier by using the frequency spectrum of the window function after windowing the single-tone signal, and obtaining the compensation amount according to the leakage amount of the single-tone signal on the nearest subcarrier; amplitude or power compensation is carried out on the nearest subcarrier of the FFT spectrum analysis, so that the FFT spectrum power of the single-tone signal can be correctly displayed. According to the method and the devi