公开(公告)号：EP3956676A1

公开(公告)日：2022-02-23

申请号：EP19835714.7

申请日：2019-10-22

申请人： Be Spoon

发明人： WAHL, Eberhard ,  BOSSERT, Daniel ,  FABRE, Pascal

IPC分类号： G01S1/04 ,  G01S5/10 ,  G01S5/02 ,  G01S5/14

公开(公告)号：EP3866019A1

公开(公告)日：2021-08-18

申请号：EP20305147.9

申请日：2020-02-17

申请人： Be Spoon

发明人： FABRE, Pascal

IPC分类号： G06F13/42 ,  H04W56/00

摘要： A method is disclosed for deriving an estimation value of a clock-error (E) for a slave clock (3), wherein the slave clock (3) is set at a nominal slave period (TLCLK_n) and outputs a sequence of slave clock signals (3') at an actual slave period (TLCLK) and wherein the difference between the actual slave period (TLCLK) and the nominal slave period (TLCLK_n) is approximated by the estimation value of the clock-error (E). The method includes:
- receiving a sequence of master clock signals (5') at a master period (THCLK) that is output from a master clock (5), and a sequence of slave clock signals (3') at an actual slave period (TLCLK) that is output from the slave clock (3),
- providing a measurement time period (43) that begins at a starting time point (43_s) and ends at an ending time point (43_e), wherein the measurement time period (43) includes a common multiple time period, the common multiple time period ends at the ending time point (43_e) and has a length in time that is a first multiple (n) of the nominal slave period (TLCLK_n) and is a second multiple (m) of the master period (THCLK),
- providing a sequence of storing time points (43_i) temporally displaced within the common multiple time period by the actual slave period (TLCLK), the last of the storing time points being the ending time point (43_e) of the measurement time period (43),
- starting to count the slave signals (3') and the master signals (5') at the starting time point (43_s),
- for more than one storing time point (43_i), storing a master count value that represents the counted master signals (5') in association with the respective storing time point (43_i),
- deriving an actual master count sum value by adding the stored master count values,
- deriving, for the more than one storing time points, a nominal master count sum value, and
- deriving the estimation of the clock-error (E) for the slave clock (3) by relating the actual master count sum value to the nominal count sum value.