A Method of Trigonometric Interpolation for Processing Radio Direction-Finding Signals

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.

Mathematical analysis for CSI scheme with the interpolation kernel size increased

“…The interpolation that estimates the intermediate values of a set of discrete samples has been widely used in the applications of signal and medical image processing [1–5]. It is well known that the ideal interpolation kernel is the sinc function, which has an infinite impulse response and is therefore not suitable for local interpolation with finite impulse response, see [6].…”