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The antenna for general shipborne 9-GHz band radars requires roughly 100 elements for the composition in the form of a phased-array antenna; thereby the cost problem arises. As a solution to the problem, JRC has adopted the virtual array technique to reduce the number of necessary elements down to 16 for the transmitting antenna and the receiving antenna, respectively; nevertheless supporting the radar performance equivalent to systems with a 100-element antenna. We have evaluated the effect of the virtual array technique, throughout computer simulations and field experiments of the prototype radar with a virtual array antenna. Our evaluation shows that our novel technique is capable of sufficient performance for shipborne radars despite its reduced composition.

Masayuki Sugano
Takuya Takayama
Yukinobu Tokieda
Hiroki Sugawara