In this paper, multiplication model of speckle image in imaging lidar is analyzed, and then suppression processing for the speckle image is finished by homomorphic wavelet filter.

At the same time, it makes on line distinguishing of the model parameters by recursion minimum quadratic multiplication real time correction algorithm with changeable forget factor.

For reactors loaded with fuel assemblies of different burnup, the evaluation model can te used to calculate core physical parameters such as core neutron multiplication factor, burnup increment, etc.