摘要
Based on the physical properties of the background noise, the uniformly broken line model of a large array with dense spacing and the fractional beamforming technique is presented in this paper. The model has made a breakthrough in traditional concept of an array with half wavelength spacing between elements. The influence of array shape distortion and. the method to reduce the distortion losses have also been analyzed and simulated. The result shows that not only SNR gain of the array system is raised about 1o dB, but also the self noise level is decreased. It also shows that the complexity of signal processors is obviously simplified and the sensitivity of element location uncertainty to the array performance is reduced. As a result, the figure of merit of a passive detection system is greatly increased.
Based on the physical properties of the background noise, the uniformly broken line model of a large array with dense spacing and the fractional beamforming technique is presented in this paper. The model has made a breakthrough in traditional concept of an array with half wavelength spacing between elements. The influence of array shape distortion and. the method to reduce the distortion losses have also been analyzed and simulated. The result shows that not only SNR gain of the array system is raised about 1o dB, but also the self noise level is decreased. It also shows that the complexity of signal processors is obviously simplified and the sensitivity of element location uncertainty to the array performance is reduced. As a result, the figure of merit of a passive detection system is greatly increased.
