dˈʊɹɹɪŋ ɐ ɹˈɛlətˌɪv kˌælɪbɹˈeɪʃən, ɐn æntˈɛnəz fˈeɪz sˈɛntɚɹ ˈɔfsɛt pˌiːsˌiːˈoʊ ænd fˈeɪz sˈɛntɚ vˌɛɹɪˈeɪʃənz pˌiːsˌiːvˈiː ɑːɹ kəmpjˈuːɾᵻd wɪð ɹᵻspˈɛkt tə ðə ɹˈɛfɹəns æntˈɛnə wˌɪtʃ ɪz nˈoːɹməli ɐsˈaɪnd zˈiəɹoʊ pˌiːsˌiːvˈiː vˈæljuːz.
During a relative calibration, an antenna's phase center offset (PCO) and phase center variations (PCV) are computed with respect to the reference antenna which is normally assigned zero PCV values.