In order to obtain the highest accuracy of calibration, this paper deduces the criterion of selecting calibration force and proposes the new concept of relative interference matrix of sensors.

Interference coefficients symptomatize exploitable wells to receive degree that disturbs,it exclude to get aquifer nature,supply,excrete condition and other natural factor influence,and relate artificial factor that is quantity,structure,distance and the plane arrange with well.

A interference coefficient as heuristic information was employed to achieve high convergence speed.

According whether the power spectrum of code chip can be used to substitute the navigation signal power spectrum when use interference coefficient to calculate intrasystem interference,defined indicators that short-code is the fluctuation range of interference coefficient with Doppler frequency offset greater than 2 dB is proposed.

The Application of mathematica in calculating FEM coefficient matrix;

A computing method of coefficient matrix is given.

Furthermore, this method also ascribes the interpolation issue with m independent variables and n powers to the research on the coefficient matrix of the linear system of equations about weighted coefficients.