Abstract
When the deceptive targets are in the ambiguious range bin but are received at the same range gate with the desired target by the array, the traditional multiple-input multiple-output (MIMO) radar is not able to discriminate between them. Based on the unique range-dependent beampattern of the frequency diverse array (FDA)-MIMO radar, we propose a novel robust mainlobe deceptive target suppression method based on covariance matrix reconstruction to form nulls at the frequency points of the transmit–receive domain where deceptive targets are located. First, the proposed method collects the deceptive targets and noise information in the transmit–receive frequency domain to reconstruct the jammer-noise covariance matrix (JNCM). Then, the covariance matrix of the desired target is constructed in the desired target region, which is assumed to already be known. The transmit–receive steering vector (SV) of the desired target is estimated to be the dominant eigenvector of the desired target covariance matrix. Finally, the weighting vector of the receive beamformer is calculated by combining the reconstructed JNCM and the estimated desired target SV. By implementing the weighting vector at the receiving end, the deceptive targets can be effectively suppressed. The simulation results demonstrate that the proposed method is robust to SV mismatches and provides a signal-to-jamming-plus-noise ratio (SJNR) output that is close to the optimal.
Highlights
The Frequency diverse array (FDA) is a new type of radar array that was proposed by Antonik [1,2] and is quite different from the traditional phased array
The traditional phased array is not able to recognize the deceptive targets generated by the repeating jammer, especially when the deceptive targets are in the mainlobe [17], while the FDA-multiple-input multiple-output (MIMO) radar with the extra degree of freedom in the range domain can suppress the mainlobe deceptive targets
We proposed a novel robust mainlobe range ambiguous deceptive target suppression method which can be implemented in the FDA-MIMO radar
Summary
The Frequency diverse array (FDA) is a new type of radar array that was proposed by Antonik [1,2] and is quite different from the traditional phased array It has unique range-dependent beampattern characteristics as it introduces frequency increments among the transmitted signals [3]. Different from the traditional phased array radar, the unique beampattern of FDA-MIMO radar brings additional freedom degree in the range dimension which can be further explored in suppressing range-dependent jammers. The traditional phased array is not able to recognize the deceptive targets generated by the repeating jammer, especially when the deceptive targets are in the mainlobe [17], while the FDA-MIMO radar with the extra degree of freedom in the range domain can suppress the mainlobe deceptive targets.
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