![]() ![]() Space Department of Johns Hopkins Universitythe GuidanceControl Laboratory of Stanford University. ![]() TianQin: A space-borne gravitational wave detector. The effect of mission duration on LISA science objectives. Observation of gravitational waves from a binary black hole merger. MICROSCOPE mission: Data analysis principle. Dynamics and control modeling for gravity probe B. The European way to gravimetry: From GOCE to NGGM. Geomagnetic data from the GOCE satellite mission. The authors declare no conflict of interest. ![]() The issue of drag-free could continue to be studied in the future. Projects of DGW represented by LISA, Taiji, and TianQin also demand high performance. GP-B was a satellite for verifying general relativity, which has made the acceleration below 10 − 9 m s − 2 Hz − 1 / 2 in the sensitive axis. GOCE was a gravitational satellite lunched after CHAMP and GRACE its technology of drag-free has been quite sophisticated, which can precisely measure data of the earth’s gravitational field. ![]() The concept of drag-free was first introduced by Lange B in the 1960s then, it was realized on TRIAD I, which was used to improve the precision of orbit determination. In recent years, drag-free spacecraft has been applied in an increasing number of fields, and an incrementally increasing number of researchers have been attracted to carrying out this work, thanks to the project Observations of the Earth’s Gravity (OEG), the Verification of Basic Theory (VBT), and the Detection of Gravitational Wave (DGW). ![]()
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