阵形畸变条件下双线阵左右舷分辨性能分析

研究了双线阵在两种阵形畸变(轴向滑移和航向偏差)条件下的左右舷分辨性能,根据双线阵指向性函数的背瓣特性分析了阵形畸变对左右舷分辨性能的影响。理论分析表明,在无阵形畸变的理想阵形情况下,窄带信号的左右舷分辨能力取决于阵间距和信噪比,而对宽带信号,左右舷分辨能力不仅与阵间距和信噪比有关,而且还与接收信号的功率谱密度、处理频段有关。在阵形发生轴向滑移和航向不一致的情况下,在正横方向附近,左右舷分辨性能主要受双线阵的航向差影响,偏离正横方向,较大的轴向滑移会导致左右舷误判。

Performance analysis of port-starboard discrimination for twin-line array in the presence of array shape distortion

The port starboard discrimination performance of a twin-line array is analyzed when there are array shape distortions,such as array axial slip and heading difference. Performance of port starboard discrimination is evaluated according to the backlobe level of the directivity function.Theoretical results show that,in the ideal case of no array shape distortion,the inter-array spacing and signal-to-noise-ratio(SNR)will determine the performance of port starboard discrimination for narrowband signals.However,for wideband signals,the port-starboard discrimination performance not only depends on the inter-array spacing and SNR,but also on the power spectral density of the received signal and the processing frequency band.In the case of array shape distortion,the port starboard discrimination performance is mainly influenced by the heading difference between the two line arrays for roughly broadside signals,and false port starboard decision may occur when the relative axial slip is large enough for roughly end-fire signals.