Recently, the "Data Calibration Method for Spaceborne Accelerometers Based on the Principle of Two-Star Adjacent Energy Difference" jointly invented by Associate Researcher Zheng Wei of the Institute of Surveying and Geophysics, Chinese Academy of Sciences and Academician Xu Houze, etc. was authorized by the National Invention Patent, patent number: ZL201110130445 8.

The 21st century is a new era in which humans use satellite tracking satellites (SST) and satellite gravity gradient (SGG) technologies to improve their ability to recognize "digital earth." The successful launch of the gravity satellites CHAMP, GRACE and GOCE indicates that mankind will usher in an unprecedented era of high-precision satellite gravity detection technology. Whether it is the inversion of the earth's gravity field by satellite orbit perturbation technology, or the refinement of satellite orbit based on the earth's gravity field inversion technology, non-conservative perturbation forces (such as atmospheric drag, solar light pressure, earth radiation pressure, orbital altitude and attitude control force) Etc.) Accurate deduction from satellite combined external forces has always been a hot issue and key technology in cross-research fields such as geodesy, geophysics, and space science. In the past, through the establishment of a non-conservative perturbation acceleration model, the measurement resolution was only 10-7 m / s2, but with the rapid development of relevant disciplines in this century and the urgent requirements for inversion of the earth ’s gravity field with high accuracy and high spatial resolution The low-precision non-conservative perturbation acceleration model can no longer meet the needs of scientific applications, industrial technology, national economy and other fields at present; the high-precision spaceborne accelerometer carried by the new generation gravity satellite can accurately deduct the The effect of conservative perturbation acceleration.

The non-conservative force data of the spaceborne accelerometer only has a high measurement accuracy within a specific frequency bandwidth, and a large system error outside the measurement frequency bandwidth. Because the difference in dissipated energy in the satellite observation equations takes the form of an integral, it leads to an energy difference drift in the observation equations. Although uniform scale factors can be used to calibrate parameters and deviation factor calculation formulas using simplified Julian days as variables, the systematic calibration errors such as accelerometer scales and deviations change with time, so unified calibration parameters are only overall non-standard The average value of the conservative force data calibration cannot correctly reflect the actual change of the daily accelerometer system deviation. Since the inversion accuracy of the earth's gravity field is sensitive to the system error of the accelerometer, the key to inversion of the earth's gravity field with high accuracy and high spatial resolution is to solve the system error caused by the non-conservative force data of the spaceborne accelerometer.

The invention relates to a method for accurate calibration of non-conservative force data of a spaceborne accelerometer based on the principle of a new double-star adjacent energy difference in the cross-technical fields of satellite geodesy, geophysics, space science, etc. On the basis of the observation equation of the binary star perturbation difference, using the prior information of the global gravity field model, and based on the principle of adjacent energy difference, a new type of adjacent energy difference observation equation was established to fit the scale factor and deviation factor of the calibration parameters , To achieve accurate calibration of the non-conservative force data of the spaceborne accelerometer.

The method has high calibration accuracy, and is suitable for fast calibration of single-star and double-star accelerometer data, which can effectively improve the accuracy of earth gravity field inversion.

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