Fixed Vertical Array

The object was to design and build a high gain, single vertical line array capable of being deployed up from the bottom of the ocean, as well as downward from FLIP. It was conceived as a low drag array that would exploit the vertical directionality characteristics of the noise field and the vertical separation of multipaths, especially between surface and submerged sources, to improve array performance in the 100-400 Hz region. At the time circa 1983, there was much to be exploited in this frequency region. After a number of difficulties, the connectorless array became the vertical surveillance array and has been used in a number of deployments with funding augmentation from the Broad Band CUARP CNO Urgent ASW Project and is expected to be used in the new Special Research Program on Reverberation. There is some possibility that, the connectorless array will be used in sea trips related to this work. It should be mentioned that although technical and funding difficulties changed the vertical surveillance program from a rather large five-year program to a much reduced one, it eventually culminated in a useful array for gaining new and unique data on the vertical directionality of the ambient noise field. CP