А.V. Grebennikov - Ph.D. (Eng.), Head of Sector, JSC «SPE «Radiosviaz» (Krasnoyarsk), Head of Department Siberian Federal University (Krasnoyarsk). E-mail: berg24@mail.ru М.Yu. Kazantsev - Ph.D. (Eng.), Associate Professor, Siberian Federal University (Krasnoyarsk) А.P. Kudrevich - Post-graduate Student, Siberian Federal University (Krasnoyarsk) S.V. Sizasov - Senior Lecturer, Siberian Federal University (Krasnoyarsk)

Time synchronization of spaced objects using GNSS has been widely used recently. In the article the results of experiments concern- ing potential accuracy of time synchronization using pair of GNSS receivers with same antenna and clock source are presented. The delays in receiver-s frontend that affect time synchronization accuracy are analyzed. The method to increase accuracy of relative time synchronization using delay-s calibration of pair of navigation receivers is shown. A range measurement-s error temperature depend- ency is presented for used GNSS receivers. The method to decrease temperature effects on time synchronization accuracy is considered.