CAJ | 학술논문

针对浅水多波束近场测深中发射未聚焦和单焦点发射聚焦导致纵向分辨力下降的问题,提出了基于Kasami编码的浅水多波束近场多焦点发射聚焦方法. 讨论单焦点聚焦原理,并引入具有优越相关性的Kasami编码信号解决多个焦点信号之间的相互干扰问题,通过公式推导了其发射和接收原理,并通过仿真对发射未聚焦、单焦点聚焦和多焦点聚焦3种情况的目标回波强度进行比较,分析表明多焦点聚焦方法具有更窄的发射波束宽度和更高的积分旁瓣比( IS-LR) ,采用国产首套浅水宽覆盖多波束测深系统进行了水池实验验证,结果表明本方法有效的提高了浅水多波束近场测深的纵向分辨力.
침대천수다파속근장측심중발사미취초화단초점발사취초도치종향분변력하강적문제,제출료기우Kasami편마적천수다파속근장다초점발사취초방법. 토론단초점취초원리,병인입구유우월상관성적Kasami편마신호해결다개초점신호지간적상호간우문제,통과공식추도료기발사화접수원리,병통과방진대발사미취초、단초점취초화다초점취초3충정황적목표회파강도진행비교,분석표명다초점취초방법구유경착적발사파속관도화경고적적분방판비( IS-LR) ,채용국산수투천수관복개다파속측심계통진행료수지실험험증,결과표명본방법유효적제고료천수다파속근장측심적종향분변력.
To solve the problem of longitudinal resolution loss caused by unfocused transmission and single-focusing transmission in shallow water multi-beam near-field sounding, the method of shallow water multi-beam near-field multi-focus transmission focusing is proposed on the basis of Kasami encoding. The principles of single-focusing fo-cus are discussed, introducing Kasami coded signals that have superior correlation to solve mutual interference problem of multiple focus signals. The transmission and reception processes are derived by formulas. Then a simula-tion is made to compare target echo intensity among unfocused, single-focal and multi-focal transmissions. Analysis indicates that the multi-focus transmission focusing method possesses narrower transmission beam width and higher integrated sidelobe ratio ( ISLR ) . Simulation and tank experimental verification based on the domestic MBES ( multi-beam echo sounder) shows that the method can effectively improve longitudinal resolution of shallow water multi-beam near-field sounding.