Performance Comparison of FFT based Frequency Estimation using different Interpolation Techniques for ELINT Systems

Fast Fourier Transform (FFT) is widely used in Electronic Intelligence (ELINT) systems for detection as well as for frequency measurement. Measurement of the frequency with high accuracy is a challenge within the trade-off of hardware resources, and without affecting other parameter measurements. In this paper, interpolation techniques are used at the output of N-point FFT, and frequency is estimated. These techniques are implemented in Matlab and results are verified for the band of input frequencies.