Gravity field measurement for the interested planets and their moos in solar system, such as Luna and Mars, is one
important task in the next step of deep-space mission. In this paper, Similar to GRACE mission, LLSST and DOWR
technology of common-orbit master-slave satellites around task planet is inherited in this scheme. Furthermore, by intersatellite
2-way UQPSK-DSSS link, time synchronization and data processing are implemented autonomously by masterslave
satellites instead of GPS and ground facilities supporting system. Conclusion is derived that the ISL DOWR based
on 2-way incoherent time synchronization has the same precise level to GRACE DOWR based on GPS time
synchronization. Moreover, because of inter-satellite link, the proposed scheme is rather autonomous for gravity field
measurement of the task planet in deep-space mission.
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