A conceptual design of an underwater missile launcher

The paper presents a conceptual design of an underwater missile launcher, which will be more difficult to detect by the enemy than conventional surface missile launchers which are currently being used.The paper suggests that the material of construction should be a composite and not a metal, as use of the latter for a large deep diving underwater vessel will result in such a structure sinking like a stone, due to the fact that it will have no reserve buoyancy. The paper also shows that composites have better sound absorption characteristics, thereby making the underwater structure difficult to detect through sonar equipment. It is proposed that this launcher should operate up to a depth of 5000 m, as at this depth, some 60% of the oceans' bottoms can be reached.The author shows that current technology can be used to construct and operate such a vessel.     

动态DEM匹配方法研究

在回顾现有制导技术之后,提出了一种新的导弹制导思想---利用动态DEM匹配方法实现导弹制导。在介绍这一思想及其实现步骤之后,文章着重介绍动态DEM匹配阶段中涉及的几个关键环节,即特征提取、特征描述、特征匹配、变换参数的解求以及相关匹配的改进等问题,最后,用实验验证了上述思想,得出结论,并为今后进一步研究提出了若干建议。     

Comparative review of marine mammal guidance implemented during naval exercises

This article reviews the types and effectiveness of marine mammal mitigation measures used during some naval activities worldwide. The three main standard methods used to mitigate the potential impacts of naval sonar sound on marine mammals are (1) time/area planning (of exercises/active sonar use) to avoid marine mammals; (2) implementation of operational procedures (e.g. ‘soft start’ - where sound levels are gradually increased over time); and (3) monitoring of animals for the purpose of maintaining an ‘exclusion zone’ around the sound source. Suggestions towards a minimum worldwide mitigation standard are made.