Efficient accuracy improvement of GRACE global gravitational field recovery using a new Inter-satellite Range Interpolation Method

► The new IRIM equation was established by introducing inter-satellite range into orbital position. ► The nine-point IRIM formula is preferable for improving the accuracy of the Earth's gravity field recovery. ► The new WHIGG-GEGM01S model complete up to degree and order 120 is produced using GRACE Level-1B data. ► The availability of new WHIGG-GEGM01S model is validated by the GPS/Levelling observations. ► The advantages and disadvantage of new IRIM method are compared with other gravity recovery methods.