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A new calibration/validation experiment forGOCE mission is proposed. Simultaneously with the satellitemission another gradiometer will be flown on the boardof the stratospheric balloon on the altitude 20–40 km. Themeasurements can be compared with satellite data. The advantageof this method is that the same functionals are compared– gravity gradients. The post-mission external calibration/validation is possible more directly than through thecomparison with the ground truth gravity anomalies or geoidundulation. The calibrating gradiometer is less sensitive, butthanks to the altitude difference, compatible in precision withthe orbiting GOCE gradiometer. Analytical procedure of thedownward continuation is presented which permits comparisonof these observables, supported by numerical examples.The threshold for the precision of the calibrating gradiometeris indicated. Similar comparison can be done betweenGOCE and GRACE missions

The possibility of the calibration/validation of the GOCE data with the balloon-borne gradiometer