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In order to improve the feasibility of low-elevation height measurement for meter-wave multiple-input multiple-output (MIMO) radar, a virtual sub-array-level beam splitting low-elevation height measurement algorithm is proposed. The algorithm can solve the coherence problems caused by low-angle multipath reflection, target reflection wave and direct wave coupling, and quickly measure the low elevation angle of the target on a flat ground, and then obtain the target height through the geometric relationship. First, establish an error graph in advance according to the radar frequency, antenna height and reflection coefficient; then combine the nine virtual channels of the three-element MIMO radar into three channels; then use the phase difference between adjacent channels to perform low-elevation encoding to confirm the target elevation range; The calculated amplitude error value is compared with the error curve diagram established in advance to obtain the target low elevation angle; finally, the target height data is obtained according to the geometric relationship. The signal model and error formula under complex terrain are finally derived. The simulation verifies the accuracy and superiority of the proposed algorithm on flat ground and complex undulating ground.

Beam Split Algorithm for Height Measurement With Meter-Wave MIMO Radar