Designing Multi-Channel Filter for Processing Coherent Pulse Train with Staggered Pulse Repetition Frequency On FPGA

In pulse and digital radio engineering systems, the Doppler frequency of a coherent pulse train (CPT) is measured by the response in a multichannel Doppler filter (MDF) based on the fast Fourier transform (FFT) algorithm. When using a coherent pulse train with different pulse repetition frequency (PRF), the efficiency of signal accumulation in the channels of the traditional FFT algorithm decreases. The coherent pulse train with different PRF will be called a coherent pulse train with staggered PRF. To eliminate this drawback when processing the CPT with staggered PRF, the authors use a modified FFT algorithm that increases the signal-to-noise ratio at the MDF outputs against the background of uncorrelated interference. The report presents the design of a modified FFT algorithm for processing the CPT with staggered PRF on field-programmable gate array (FPGA).