Abstract
Radio direction-finding techniques that use amplitude-trigonometric interpolation between signals received at a circular antenna array are reexamined. The accuracy of this class of direction-finding system is limited by interpolation, gain mistracking, and additive-noise errors. The channel gain mistracking error is shown to be significantly lower than previously estimated. Typical calculations show that the trigonometric interpolation technique is an order of magnitude more accurate than previously supposed.
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