Study On Variable Patterns Of DCPA & TCPA And Best Avoiding Means

The study of Ship Collision Avoidance Optimization Scheme is the forward task of the field of Ship Collision Avoidance at present. The determination of the scheme of Collision Avoidance is significant to navigational safety and to increase the economic benefits, which supports the theoretical foundation to the establishment of Collision Avoidance Expert System and Intelligent Traffic MIS.The research works of this paper can be mainly demonstrated in the following aspects:1 New model of Dangerous Degree of Collision Avoidance (DDCA) was studied to determinate the best scheme of collision avoidance;2 Ten factors, which affect the avoiding effect, were discussed in details;3 Changing rules of DCPA and TCPA were discussed, according to the International Collision Avoidance Rules at Sea, under the following three circumstances: Cross situation, Head on situation, as well as Overtake situation;4 To focus the discussion on Cross Situation. The Head on situation and Overtake situation can be regarded as a special case of Cross Situation;5 Through the comprehensive analysis of all kinds of schemes, to determine a best scheme of Radars Collision Avoidance, which may be applied to the following three circumstances: Cross Situation, Head on Situation as well as Overtake Situation, thus to take any measures to alter course, slow down or slow down with alteration;6 Through the analysis of a special situation, to study the method how to calculate the range of dangerous angle of Collision Avoidance;7 Through the statistics of action of Collision Avoidance, to find out the rules of taking actions to revise the "Best Scheme";8 The principle and method of optimization are presented.