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Sorry about my approximativ english.
We use the term of "monopulse antenna" for an antenna dedicated to track a moving target thanks to a so called monopulse system. The principle of a monopulse system is based on the creation of a tracking signal inside the feed of the antenna which has the particularity to have a null amplitude when idealy pointed to the target and to have an increasing amplitude when depointed from the target. The more the antenna is depointed the bigger is the amplitude (around the pointed direction). A monopulse system tries continuously to cancel the amplitude of this signal. That will mean the antenna remains idealy pointed to the target. This system has really good tracking performances (when it is properly tuned) compared to more simple system like Step-Track system which just tries to maximize the fundamental signal received from the target. I am not sure I was clear.

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