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Abstract Tiangong-2 Interferometric Imaging Radar Altimeter (InIRA) is the first wide-swath radar altimeter adopting small incidences angles with short baseline. The knowledge of the roll angle of the baseline is crucial for measuring the wide-swath Sea Surface Height (SSH) with centimeter-level accuracy. In this work, we aim to validate the technique of baseline angle determination from spaceborne nadir interferometric echoes which has been tested by airborne experiment. According to the observation geometry, the interferometric phases of nadir echoes acquired by Tiangong-2 Imaging Radar Altimeter (InIRA) are related to the roll angle of the baseline, so it should be possible for us to retrieve the incline angle from the interferometric phases under some ocean conditions not so high. In order to do so, the Tiangong-2 was tilted about 5 so as to realize a 0 baseline and in this way, a lot of data was collected. In this …