公开(公告)号：US12072426B2

公开(公告)日：2024-08-27

申请号：US17782128

申请日：2020-02-24

Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Chang Don Kee ,  Junesol Song ,  O Jong Kim ,  Jungbeom Kim

IPC: G01S19/44 ,  G01S19/42 ,  G01S19/51

CPC classification number: G01S19/44 ,  G01S19/426 ,  G01S19/51

Abstract: A time-differenced carrier phase (TDCP) measurement value-based navigation system according to one embodiment of the present disclosure comprises: a satellite navigation system information reception unit for acquiring satellite navigation system information including a carrier phase measurement value; an initial position determination unit for determining an initial position of a target on the basis of the satellite navigation system information; a TDCP acquisition unit for acquiring a TDCP measurement value; a relative position determination unit for determining a relative position of the target on the basis of the TDCP measurement value; and an absolute position determination unit for determining an absolute position of the target by accumulating relative positions according to time of the initial position of the target. Therefore, time and expenses required for determining integer ambiguity can be reduced, and precise position of a cm-level error can be measured by using a low-cost satellite navigation system information receiver.

公开(公告)号：US20240012158A1

公开(公告)日：2024-01-11

申请号：US18035074

申请日：2021-10-14

Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

Inventor： Chang Don Kee ,  Jungbeom Kim ,  O Jong Kim ,  Yonghwan Bae

IPC: G01S19/40 ,  G01S19/23 ,  G01S19/07 ,  G01S19/29

CPC classification number: G01S19/40 ,  G01S19/23 ,  G01S19/07 ,  G01S19/29

Abstract: A method for estimating a multipath error of a pseudo-range measurement value, according to an embodiment of the present invention, comprises the steps of: obtaining satellite navigation system information including a pseudo-range measurement value and a carrier wave phase measurement value; obtaining a carrier wave phase time difference measurement value by differentiating the carrier wave phase measurement value with respect to an arbitrary time; setting a monitoring variable for multipath error estimation by using the carrier wave phase time difference measurement value; detecting a change amount of a multipath error regarding the arbitrary time by using the monitoring variable, and determining a time period that can be used to estimate the multipath error; and estimating the multipath error at a specific time point by using the change amount of the multipath error relative to an arbitrary reference time. According to an embodiment, the location of a target can be precisely determined even in a downtown environment in which signal distortion is severe, by estimating the multipath error included in the pseudo-range measurement value, and compensating for or excluding the multipath error.