The measurement mode is one of the main factors affecting the performance of shipborne strapdown gravimetry. However, the applicability of existing gravimetry modes in shipborne applications remains unclear. This paper conducts a comparative study of measurement modes. First, the measurement principles of the currently commonly used strapdown inertial scalar gravimetry (SISG) and rotation invariant scalar gravimetry (RISG) are presented. Then, based on the characteristic that both strapdown inertial navigation system/global navigation satellite system (SINS/GNSS) integrated navigation and GNSS can provide displacement information for shipborne gravimetry, the implementation steps of the full parameter measurement modes based on SINS/GNSS integrated navigation information (FP-SISG/FP-RISG) and the different parameter source measurement modes based on SINS/GNSS integrated navigation attitude information and GNSS displacement information (DP-SISG/DP-RISG) are given. The theoretical analysis and comparison are carried out. Finally, a lake navigation test is conducted. The results indicate that the accuracy of the full parameter measurement mode is superior to the measurement modes of different parameter sources. In the sailing state, the internal consistency accuracy of FP-SISG/FP-RISG has improved by over 82% compared to DP-SISG/DP-RISG, and FP-SISG has the best accuracy. This work provides a certain reference for the selection of the measurement mode of shipborne strapdown gravimetry in the future.
Ma et al. (Fri,) studied this question.
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