Simulations Of Various Centroiding Algorithms

Evaluated are four different centroiding algorithms for use in the Kitt Peak National Observatory Photon Counting Array (KPCA). Computer simulations are performed on each of the four different methods. Variations are applied in the simulations and a decision is formed resulting in the method configured in hardware. The algorithm needs to control the placement of the center of a photon splash to 1/8 + 1/8 of an array element. The overall photon splash will acquire an approximate spatial area of 5 x 5 array elements. Restricted by the need to centroid in real-time, the algorithm must handle incoming array data at a rate of 20MHz. Both 3 x 3 and 5 x 5 spatial algorithms are considered. Simulation results of the selected algorithm are confirmed in the centroider hardware, giving the resolution required. Based on the simulations evaluated, new real-time configurations are being con-sidered for future implementation.