Hardware Implementation of Real Time Cavity Parameters Identification System

An implementation of cavity parameters estimation system (CPES) is presented. Main idea of the CPES is to support the LLRF -low level radio frequency system for FLASH laser in DESY. Algebraic, complex model of the LLRF system is proposed. For a given model structure the input-output relation of the real plant with unknown parameters is applied. The over-determined matrix equation is created covering the long enough measurement range with a solution according to the least squares method. A base function approximation by cubic B-spline set is applied to estimate the time-varying cavity detuning during the pulse. An implementation in DSP processor of the matrix equation solution and cavity parameters estimation algorithm is presented. A comparison between Matlab and DSP computation error is presented.