However, in shallow water, because the arrival signals of the vertical linear array are not planewaves, the spatial gain needs to be estimated properly.
而在浅海环境中，由于到达垂直线列阵的声波并不满足平面波假设，其空间增益需要作出正确估计。
2
Three planewaves with three equal angles formed by each two wave normal lines are recorded on hologram by three exposures.
采用三次曝光在全息图上依次记录下三个两两波法线夹角相等的平面波。
3
For a receiver antenna, the real target signal is basically of planewaves.