A single-axis rotation modulation strapdown gravity vector measurement method considering scale factor

Aiming at the problem that the single-axis rotation modulation technology is currently used in gravity measurement, only considering the inertial device's zero bias will restrict gravity measurement accuracy, a single-axis rotation modulation strapdown gravity vector measurement method considering the scale factor error is proposed. This method analyzes the one-way continuous rotation scheme and finds that the up-direction scale factor error stimulates additional attitude errors. To suppress the error and improve the measurement accuracy of the strapdown gravity vector, a dual-position forward and reverse turn-and-stop scheme is adopted, which designs a reasonable rotation path, stop position, and time. The simulation results show that the dual-position forward and reverse turn-and-stop scheme, considering the scale factor, can effectively improve the accuracy of gravity measurement compared with the one-way continuous rotation scheme. This study has great technical reference significance and engineering practice significance and can meet the needs of high-precision airborne and marine gravity measurement.