K-distributed radar clutter sequence generator on FPGA

In this work, we present a sequence generator module on FPGA that provides the generation of K-distributed samples used in sea clutter modelling. Sequence generator is obtained by modification of widely used Box-Muller based Gaussian sequence generators into Rayleigh and Gamma sequence generators. The sqrt and ln functions in Box-Muller algorithm are approximated using piecewise polynomial function approximation method. The design implemented on a Xilinx Virtex-4 XC4VSX35- 12 FPGA can generate 5 million samples per second.