| 摘要 |
An antenna array for radio interferometry uses three equi-spaced triplets set vertically above the ground with different respective spacings, the center antenna of each triplet being at a different height. Signal processing circuits provide for each triplet a signal which is a function of the elevation angle theta but is independent of the ground reflection coefficient, P. the signals are weighted to give the optimum value of theta , e.g., by selecting the signal varying most rapidly with theta . Some antennae can be shared and for example three triplets may be provided by seven antenna elements.
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