Low-frequency signal generation method based on array structure

The invention provides a low-frequency signal generation method based on an array structure. The low-frequency signal generation method comprises the steps of: enabling each radiation unit in a hectometer-level array structure to sequentially transmit pulse signals from the near end to the far end of an array at a certain time interval, and enabling an equivalent radar to move away from a target at a low beam speed; setting a phase of the radiation unit signal according to the electromagnetic wave Doppler effect, and realizing the movement of the target region radiation unit signal envelope through the time interval and the wave path difference of the signal emission of adjacent radiation units; enabling the phase equivalently formed in a target region space to rapidly change in a fast time and change for multiple times in a single carrier cycle time through a mode of signal phase modulation of a radiation unit or staggered arrangement of a plurality of rows of arrays to construct a staggered array, so that a