Abstract:

The beam pattern of multipleinput multipleoutput(MIMO) radar is derived analytically, which shows that it is the product of transmitter and receiver beam pattern. By assuming that the receiver interelement is halfwavelength spacing, this paper analyzes the interelement spacing of the transmitter, and gets the follow conclusion: when the transmitter interelement is halfwavelength or Mr/2wavelength spacing (Mr is the transmitter elements), the beam pattern of MIMO radar cannot form the high sidelobe. And when the transmitter interelement is between halfwavelength and Mr/2 wavelength spacing, the transmitter will form the grating lobe which leads to the high sidelobe in the beam pattern. Furthermore, in order to suppress the high sidelobe, a new pattern synthesis algorithm is used to cancel the grating lobe, which can suppress the sidelobe efficiently. Simulations verify theoretical analysis.