Sideband radiation suppression method for time modulation array and antenna system

The invention provides a sideband radiation suppression method for a time modulation array and an antenna system. The antenna system structurally and mainly comprises an antenna unit, N radio frequency power amplifiers, N phase shifters, a probability-based time modulator, a one-to-M power divider, a baseband signal generator, a frequency mixer, a local oscillator source and a controller. Compared with a traditional time modulation array, a time modulation waveform is a non-periodic random time sequence, so that sideband radiation level is reduced to the greatest extent; after the probability that each antenna unit is in the radiation state is determined, the corresponding time sequence can be generated randomly, and a complicated optimization algorithm is not needed; the radiation signals of the time modulation array based on the invention have directional modulation characteristics, that is to say, the radiation signals are different for different angles, and the time modulation array can be used for a phys