Ship-borne dynamic absolute gravity measurement based on cold atom gravimeter

Cold atom gravimeter is gradually developing towards miniaturization, dynamics and practicality. It is ofgreat significance to apply it to deep and far sea absolute gravity measurement and underwater long navigationtime and high-precision navigation. At present, most cold atom gravimeters are still in the state of laboratorystatic base or quasi-static base measurement, which is difficult to meet the gravity measurement needs indynamic application scenarios. Therefore, the research on "static to dynamic" of cold atom interferometricgravity measurement is very urgent and key. In this paper, the basic principle of dynamic measurement isanalyzed, the basic method of combined measurement of cold atom gravimeter and accelerometer is given, a setof absolute dynamic gravity measurement system based on cold atom gravimeter and inertial stabilizationplatform is built, and the ship-borne dynamic measurement experiment is carried out by using the combinedmeasurement method of cold atom gravimeter and traditional accelerometer. Firstly, the continuous absolutegravity measurement for about 40 h is carried out in the laboratory static environment to preliminarily evaluatethe performance of the cold atom gravimeter. The sensitivity is 447 mu Gal/, and the long-term stability canreach 2.7 mu gal. On this basis, the ship-borne experiment is conducted, the survey ship sails on the lake at aspeed of about 4.6 kn, and the ship-borne absolute dynamic gravity measurement is carried out by means ofrepeated survey lines. After evaluation, the internal coincidence accuracy of the four repeated survey lines is2.272 mGal, and the external coincidence accuracy values of the four voyages are 2.331, 1.837, 3.988 and2.589 mGal respectively. Finally, according to the experimental results, the possible problems are furtheranalyzed and summarized. This experimental study provides preliminary verification and technical schemereference for marine absolute dynamic gravity measurement