US 12,072,426 B2
Time-differenced carrier phase measurement value-based navigation system, and position measurement method
Chang Don Kee, Seoul (KR); Junesol Song, Uiwang-si (KR); O Jong Kim, Seoul (KR); and Jungbeom Kim, Seoul (KR)
Assigned to Seoul National University R&DB Foundation, Seoul (KR)
Appl. No. 17/782,128
Filed by SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, Seoul (KR)
PCT Filed Feb. 24, 2020, PCT No. PCT/KR2020/002623
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/112331, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 10-2019-0159067 (KR), filed on Dec. 3, 2019.
Prior Publication US 2022/0397684 A1, Dec. 15, 2022
Int. Cl. G01S 19/44 (2010.01); G01S 19/42 (2010.01); G01S 19/51 (2010.01)
CPC G01S 19/44 (2013.01) [G01S 19/426 (2013.01); G01S 19/51 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A time-differenced carrier phase (TDCP) measurement-based navigation system, comprising:
a satellite navigation system information reception unit to acquire satellite navigation system information including carrier phase measurement;
an initial position determination unit to determine an initial position of a target based on the satellite navigation system information;
a TDCP acquisition unit to acquire a TDCP measurement by time-differencing the carrier phase measurement between consecutive times;
an integer ambiguity change detection unit to detect a change of integer ambiguity in the carrier phase measurement;
a relative position determination unit to determine a relative position of the target based on the TDCP measurement; and
an absolute position determination unit to determine an absolute position of the target by accumulating the relative position over time from the initial position of the target,
wherein when the change of integer ambiguity in the carrier phase measurement is detected, the relative position determination unit is configured to perform one of exclude the carrier phase measurement and its time-differenced measurement in determining the relative position, and estimate a magnitude of the change of integer ambiguity and compensate the measurement for the corresponding magnitude for use to determine the relative position,
wherein the system determines a position of the target using the TDCP measurement without determining the integer ambiguity.