Correction coefficients can be received based on statistic average when importing a test signal. Then quadrature demodulation errors are realized.

The mathematics model is closely studied of residual correction of the dynamic fixed average position and static fixed position of longitude and latitude of the RBN/DGPS customer.

Experimental results show that it can reach nearly 100% accuracy of the correction rate for standard characters and 95% of the average recognition rate for characters with micro-deformation.