被动式渔探仪的信号检测与方位估计

为了降低渔探仪成本、简化设备、提高作用距离,将被动式声纳技术应用于渔探仪系统.采用被动式声纳原理,利用矢量水听器接收声场中质点的声压和振速信息,对声压和振速进行联合处理,从而对信号的声能流值进行最大似然比检测,在最大似然比检测的基础上对声源的方位角进行估计,获得方位角的最大似然估计值.实验结果表明:声能流检测器能有效地抑制各向同性的噪声,提高增益,方位估计能进行目标定位,定位误差小,效果良好.利用被动式声纳技术及采用新型传感器(矢量水听器)技术,使得构造一个具有全新概念的被动式渔探仪成为可能.

Signal detection and direction estimation of passive fishery detector

Passive sonar technology was applied to the fishery detector to reduce the cost of fishery detector and enlarge the detecting range.It adopted the principle of passive sonar and received both the information about sound pressure and vector velocity of noise source in water.Sound pressure and vector velocity were jointly processed to detect maximum likelihood ratio of acoustic energy flux.On the basis of this,arimuth of sound source was estimated and maximum likelihood ratio was obtained.The result of experiments in reservoir shows that the detector of acoustic energy flux can suppress the noise and realize gain.Target arimuth is estimated with less error and the effect is good.The use of passive sonar and new transducer(vector hydrophone)makes the new passive fishery detector come into being.