Superdirective receiving arrays

Superdirective Beamforming With Interferences and Noise Suppression via Second-Order Cone Programming

“…According to the results shown in [5], the signal-to-noise-ratio (SNR) of the receiving system is proportional to the directive gain as long as the system background noise dominates. The directive gain can be defined as:…”

“…In the past decades, the so-called superdirective array [4][5][6][7][8][9] has drawn numerous researchers. It is claimed that a small size array using superdirective beamforming method can perform as high directivity as a large-size array using conventional beamforming, which means that the expensive vast aperture HF receive array can be replaced by a lowcost small array without sacrificing gain.…”

“…According to the discoveries of Newman et al [5], and Barrick and Lilleboe [7], low efficiency is no longer a limitation, provided that the minimum efficiency of HF receive arrays guarantees the attenuated external noise greater than internal receiver noise. The combat with array uncertainty can be conducted from two aspects.…”

“…Although the array is hard to be calibrated the same as the ideal array model, the residual error after a series of calibration measures cannot be very large. Except array calibration, another way is to develop superdirective beamforming method with robustness to array uncertainty [5,9].…”

Robust Superdirective Beamforming for Hf Circular Receive Antenna Arrays

“…Among those well-established theories and technologies, superdirectivity [20][21][22][23][24] is a huge attraction to the researchers. This concept claims that a small size array can perform as high directivity as a largesize array, while the directivity of the large-size array is achieved by conventional beamforming.…”