摘要
为测出载体对地的二维速度 ,常规的多普勒计程仪使用 3到 4个活塞型收发共用换能器形成 3～ 4个独立的指向性波速 .这往往需要进行声速补偿 ,才能保证得到足够的测速精度 .在要求对底跟踪深度较大而不得不采用较低的工作频率时 ,基阵尺寸将急剧增大 ,不便于安装 .相控阵多普勒计程仪采用一个多元平面相控阵形成 4个所需的指向性波束 ,无需进行声速补偿 .结果使基阵尺寸显著减小 ,因而已得到较多的应用 .本文从基阵理论出发分析了这类多普勒计程仪的平面相控阵的基本设计思想 .文中首先利用复合阵概念分析了等间距线列阵指向性的合成方法 ,在此基础上给出了相控发射和接收方案 ,并已经设计和制作了一个包括平面相控阵和硬件电路的试验系统 .文中简要介绍了这一系统的组成 ,也给出了基阵实测指向性和水池测速试验的部分结构 .
To measure 2-D velocity of a vehicle relative to the ground,3 or 4 piston monostatic transducers are used to form 3 or 4 independent beams in the conventional Doppler log.The compensation for aound velocity is generally involved in this kind of devices to get a high enough precision of measured velocity.Furthermore,when a greater depth for tracking the bottom is required and the higher working frquency has to be used,the size of the array will rapidly increase and cause difficulties to mount.In the phased_array Doppler log,a plane phased array with multielements are employed to form 4 required beams and no compensation for sound velocity is needed.As a result,the size of the array is decreased and hence this type of Doppler log has got more application in recent times.From the array theory,the basic idea to design the phased_array for this kind of Doppler log is proposed.By using the concept of combination array,the method of synthesizing directivity for an equal spaced linear array is analyzed.Then,based on the idea,a scheme to realize transmitting and receiving with phase control is given.A built test system including a plane array with multielements and some hardware is briefly described.The measured directivities of the designed array and some experimental results in test tank are given as well.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
2002年第1期80-85,共6页
Journal of Harbin Engineering University
