SST Gravity Field Measurement System and Method Based on Inspection Mass Spacing Measurement

By introducing a quality verification unit and high-precision laser interferometric ranging within the satellite platform, an inter-satellite distance measurement path of 'quality verification-quality verification' is constructed, solving the accuracy problem caused by non-conservative force disturbances in traditional satellite gravity measurements and achieving high-precision and stable gravity field measurement.

CN121348449BActive Publication Date: 2026-06-30HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Filing Date
2025-11-10
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional satellite gravity measurement methods are easily limited by non-conservative force disturbances of the satellite platform itself, resulting in low accuracy of gravity field measurement.

Method used

The SST gravity field measurement system based on inspection mass spacing measurement is adopted. By introducing inspection mass units as inertial references inside the satellite platform and combining them with high-precision laser interferometric ranging, the inter-satellite distance measurement and non-conservative force measurement are integrated into a single design, constructing an inter-satellite distance measurement path of 'inspection mass-inspection mass'.

Benefits of technology

It significantly improves the measurement accuracy and disturbance resistance of the gravity field measurement system, realizes high-confidence level measurement of interstellar spacing and its rate of change, and enhances the long-term stability of the measurement system.

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Abstract

This application belongs to the field of satellite gravity field measurement technology, specifically disclosing an SST gravity field measurement system and method based on the measurement of the distance between check masses. The system is applied to two satellite platforms in a target orbit, including a control unit, two laser interferometry systems, and two check mass units; wherein one laser interferometry system and one check mass unit are each deployed on one satellite platform. By directly measuring the distance and its rate of change between check masses installed on the two satellites using laser interferometry on two gravity field measurement satellites tracking the low-low satellite, global gravity field measurement is achieved. This application integrates inter-satellite distance measurement and non-conservative force measurement into a single design, unifying the coordinate references for inter-satellite distance measurement and non-conservative force measurement. This reduces the disturbance effects introduced by the conversion of two independent coordinate systems and changes in the coordinate frame in existing schemes, resulting in higher measurement sensitivity and confidence level.
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