A Basic Study on Application of Microwave Solid State Devices to a Ship Docking Radar

概要

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In Japan, any berth for a VLCC (Very Large Crude Carrier), at present, has a sonar docking instrument. Being a rather sophisticated instrument, it is expensive. Therefore, it is not part of general berth equipment in other areas. For example, general merchant ships do not have this kind of equipment except for a doppler sonar in certain ships. With the difficulties in docking a ship, some handy and efficient instrument, such as a low speed meter to help docking manoeuvre, should be required. It felt that the self-mixing characteristics of microwave solid state devices such as the BARITT, IMPATT and Gunn devices are available as a simple doppler radar for this purpose. The minimum detectable sensitivity (MDS) at lower frequencies of the doppler effect, from 1Hz to 1KHz, was measured with the intention of applying these devices to a doppler radar. In a experiment with lower frequencies, the BARITT proved its superiority in MDS. The measurement of doppler frequency using an actual moving target in a laboratory situation and a model ship in a ship experiment basin also proved that the doppler frequency has adequate precision for such an application. Using the results of these experiments, the output power of each device needed to cover a distance of 100m for such a radar was estimated. The result proved that the BARITT device would be the best device of the three for the docking doppler radar.
社団法人日本航海学会の論文
1978-08-25