Dynamics of soil infiltrability of sloped lands under rainfall conditions measured with runoff-ponding method and the accuracy estimations;

Accuracy estimation is an important part in linear parameter processing,and cumulative-sum method is a new method for linear parameter processing.

The methods of precision estimation of GPS RTK survey production are given in this paper,and their application is introduced with examples.

The methods of precision estimation of GPS RTK survey produc- tion are given in this paper.

After reading some related research papers and a whole study of the principles and methods of controling network,the writer probes into the technologies of GIS -based automatical place-selecting , automatical network building and tentative precision estimation of the controling network.

To eliminate the imprecision of carrier frequency offset estimation using the cyclic prefix,a fitting method based on LS algorithm(CPLS) is proposed,which can dramatically improve the estimation precision.

The estimation accuracy and resolving power are investigated to measure the performance of joint spectrum.

Estimation accuracy of LFM signal parameters based on fractional Fourier transform are evaluated by a perturbation a- nalysis,and expressions for root mean square of estimation error of radian frequency and radian frequency rate are derived,the former is inverse proportion to observation time and the latter is inverse proportion to square of observation time.

For the needs of active optics, accuracy estimate for the parameters, the wanted parameter, and the result for which the wanted parameter resolved by the method is substituted in the equation in the damp least square method proceed.