CAJ | 학술논문

基线附近区域为双基地声呐的探测盲区,当目标位于基线区域时,目标回波与强直达波干扰同时同向到达,基于空域滤波等的传统直达波抑制方法失效. 为实现双基地声呐对盲区内目标的探测,提出了一种适用于多发射阵元系统的发射声屏蔽技术. 发射声屏蔽技术利用目标回波与直达波相异的多途信道结构特性,自动屏蔽在接收站位置处的直达波而不影响目标回波,且不需接收站进行任何后续处理. 在已知回波信道信息时,发射声屏蔽技术可进一步实现对回波信号的聚焦,提高信干比. 仿真结果表明,在不同信道条件下发射声屏蔽均能有效抑制直达波干扰. 利用发射声屏蔽技术,双基地声呐能够实现对基线区内目标的检测.
기선부근구역위쌍기지성눌적탐측맹구,당목표위우기선구역시,목표회파여강직체파간우동시동향도체,기우공역려파등적전통직체파억제방법실효. 위실현쌍기지성눌대맹구내목표적탐측,제출료일충괄용우다발사진원계통적발사성병폐기술. 발사성병폐기술이용목표회파여직체파상이적다도신도결구특성,자동병폐재접수참위치처적직체파이불영향목표회파,차불수접수참진행임하후속처리. 재이지회파신도신식시,발사성병폐기술가진일보실현대회파신호적취초,제고신간비. 방진결과표명,재불동신도조건하발사성병폐균능유효억제직체파간우. 이용발사성병폐기술,쌍기지성눌능구실현대기선구내목표적검측.
The area near the baseline is a dead zone for bistatic sonar. The echo and the strong direct wave will ar-rive in the same place simultaneously when the target is in the baseline area and the direct wave suppression method based on a spatial filter will fail. To detect targets in the dead zone, a transmission shielding method for a multi-ele-ment transmit system is proposed. The transmission shielding automatically suppresses the direct wave at the receiv-ing station utilizing structural differences in multiple channels between the echo and the direct wave. The transmis-sion shielding further focuses on the echo, so as to improve the Signal-Noise Ratio, using known echo channel in-formation. The simulation results show the transmission shielding method can suppress direct wave interference for different multipath channels. Bistatic sonar can detect targets in the baseline area utilizing the transmission shielding method.