Precise Response Control of Transmit-Receive Two-Dimensional Beampattern in FDA-MIMO Radar

Abstract

Frequency diverse array (FDA) has sparked intense interest in recent years because of its range-angle-dependent beampattern. By combining with the multiple-input and multiple-output (MIMO) technique, additional degrees of freedom (DOFs) are provided. However, dynamic environments require the design of a precisely controlled beampattern to enhance the robustness of the radar system. In this paper, the precise response control (PRC) algorithm is studied in the FDA-MIMO radar by imposing artificial interferences within rectangular regions in the joint transmit-receive spatial frequency domain. The algorithm is performed via two stages. In the first stage, artificial interferences are concurrently imposed to iteratively adjust the responses. In the second stage, extra artificial interferences are added to satisfy the predefined response requirement for all regions. The jammer-plus-noise covariance matrix is constructed accordingly and the weight vector is updated. Particularly, the jammer-to-noise ratio (JNR) of each artificial interference is figured out. Numerical results are provided to corroborate the performance of the transmit-receive two-dimensional beampattern in FDA-MIMO.