High Resolution Frequency MIMO Radar

The frequency MIMO radar synthesizes a wideband waveform by transmitting and receiving multiple frequency signals simultaneously. This paper provides the efficient transmitter array configurations and signal processing methods to improve the cross range resolution and range resolution of the frequency MIMO radar after receiving beamforming. The key is to properly apply the weightings to the multiple subband returns to compensate the delay differences and phase shifts between them. To eliminate the ambiguous images, the nonuniform array and the auxiliary array layout are employed, and the round robin transmission scheme is utilized on the basis of the configuration of the main array plus the auxiliary array. Among them the "round robin" transmission scheme can obtain the best cross resolution at cost of decreasing the pulse repeat frequency. In the "round robin" transmission scheme, spatial diversity technique can be used to combat the target RCS scintillation.