Design and FPGA implementation of time-frequency transforming for stretch processing

Abstract

Stretch processing is an efficient method for pulse compression in chirp radar. A FPGA implementation of time-frequency transforming for stretch is presented. The key point is to calculate the spectrum points of interest using the segmental Time-Division Multiplexing (TDM) Discrete Fourier Transform (DFT), and the CORDIC algorithm is used to compute the complex multiplication. This approach shortens time and reduces memory size relative to FFT.