The water quality multi parameter identification and inverse algorithm;

Combined with the inverse algorithm of the optimum regulation technique,the particle size distributions of sediment under different volumetric concentrations are obtained according to the attenuation prediction of Coupled-phase model plus Bouguer-Lambert-Beer-Law scattering model and experimental attenuation spectrum at frequency ranges from 2MHz to 7MHz.

Some problems on the Philip-Twomey-NNLS inverse algorithm used widely in particle sizing were discussed, and a new method is presented to optimize the parameter y.

This means the inversion algorithm of the paper has a good value in actual applications.

An autoconvolution algorithm is established for the processing of the optical projection data of the pendulum wire, and an algebraic inversion algorithm is given for the extraction of the coordinates of the pendulum wire from the multidirectional projection data.

The principle of general case inversion algorithms is presented.

The main task of this paper is to study the retrieval error of salinity retrieval algorithm in terms of ocean salinity microwave remote sensing, analyze the influencing factors of salinity remote sensing and determine the correction method.

In order to solve the problem,an exponential expression similar to that of the electromagnetic wave propagation loss is used to describe change of observation weight with distance,and the standard statistics retrieval algorithm is used to test the effect of retrieval speed and precision caused by different observation weight.

The paper illustrates the principle of sound wave computer tomography and three inverse algorithms and explains the characteristics of ART,CGLS and LSQR with a typical case of the cement injection quality detection.