Accurate one-point positioning method for single-frequency GPS receiver

[0124] refer to Figure 12 , a precise single-point positioning method for a single-frequency GPS receiver, comprising a GPS data reading and preprocessing step, an error correction solution step, and a result output step, the preprocessing step including detecting and repairing a cycle slip, The detection and repair steps of the cycle slip include:

[0125] 1) The m carrier phase observations without cycle slip φ i Bring into formula (1) for polynomial fitting;

[0126] i=1,2,...m; m>(n+1)

[0127] (1)

[0128] The polynomial coefficients in the formula are obtained by the least square method, and according to the fitted residual V i Calculate the error:

[0129] σ ( j ) = V i V i m -...

[0224] Examples 2-3: Comparison of solution accuracy between grid model and semi-sum correction method

[0225] In this embodiment, the data of IGS tracking stations BJFS (bjfs0150.07O) and WUHN (wuhn0150.07O) on January 15, 2007 are respectively solved by ionospheric grid model and half-sum correction method. In the data processing, only the L1 and C / A code data in the observed values ​​are used for the calculation of the data of the IGS tracking station. Statistical results such as Figure 8-11 shown.

[0226] As can be seen from the figure:

[0227] 1) Using the grid model to correct, the accuracy of 5 decimeters can be achieved in the N and E directions. But the accuracy in the U direction is about 1 meter;

[0228] 2) Using the semi-sum correction, the accuracy of about 2 decimeters can be achieved in the N, E, and U directions;

[0229] 3) It is obvious that the semi-sum correction method achieves higher accuracy than the grid model correction method. The main reas...