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A technique to estimate the relative gains, tuning phases, and RE phase shifts of the elements of a phased-array radar

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3 Author(s)
Hung, E.K.L. ; Communications Research Centre, Ottawa, Ontario, Canada ; Fines, N. ; Turner, R.M.

An in-situ technique to estimate the following parameters of a phased-array antenna is described: 1) the relative array-element excitation voltages, 2) the array-element tuning phases, and 3) the RF phase shifts at the array elements. This technique has several significant features. First, it involves the use of two auxiliary antennas. One is a remote continuous wave (CW) source directed at the phased-array antenna. The other is a passive antenna mounted close to the phased-array antenna. Its output is used to produce a reference phase for phase measurements. Second, it contains a technique to reduce the errors in phase estimates. Third, it takes note that beam steering uses phase sums of the form ( \phi_{k} + \beta _{kl} ), where \phi_{k} is the tuning phase for the k th array elemenet and \beta _{kl} , is an RF phase shift of the array element, and pays special attention to reduce the errors associated with the estimates of these sums. Fourth, it assumes the use of a reasonably stable and strong CW source of commerically available quality. No other assumptions are made. Experimental results obtained with a 295-element S -band space-fed phased-array antenna are given.

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Antennas and Propagation, IEEE Transactions on  (Volume:33 ,  Issue: 3 )