US 10,890,666 B2
Satellite radiowave receiving device, electronic timepiece, control method for obtaining positioning information, and recording medium
Tatsuya Sekitsuka, Kunitachi (JP); and Takeshi Matsue, Kokubunji (JP)
Assigned to CASIO COMPUTER CO., LTD., Tokyo (JP)
Filed by CASIO COMPUTER CO., LTD., Tokyo (JP)
Filed on Sep. 19, 2018, as Appl. No. 16/135,229.
Claims priority of application No. 2017-183259 (JP), filed on Sep. 25, 2017.
Prior Publication US 2019/0094382 A1, Mar. 28, 2019
Int. Cl. G01S 19/32 (2010.01); G04G 5/00 (2013.01); G01S 19/31 (2010.01); G04R 20/04 (2013.01)
CPC G01S 19/32 (2013.01) [G01S 19/31 (2013.01); G04G 5/002 (2013.01); G04R 20/04 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A satellite radiowave receiving device comprising:
a receiver for performing a receiving operation of radiowaves transmitted from a plurality of positioning satellites; and
a processor being configured to:
determine an elapse of a predetermined positioning time interval from a last positioning operation;
in response to a determination of the elapse of the predetermined positioning time interval from the last positioning operation, perform a current positioning operation using preliminarily obtained date and time information and valid positional information on the plurality of positioning satellites to obtain a current position of the satellite radiowave receiving device and current date and time information;
before the elapse of the predetermined positioning time interval from the last positioning operation, determine an elapse of a predetermined date and time updating interval from a last time when date and time information is obtained from radiowaves transmitted from at least one positioning satellite, wherein the predetermined date and time updating time interval is shorter than the predetermined positioning time interval; and
in response to a determination of the elapse of the predetermined date and time updating time interval from the last time when the date and time information is obtained, cause the receiver to perform the receiving operation to obtain updated date and time information from radiowaves transmitted from a single positioning satellite and received by the receiver, such that the updated date and time information is obtained without a positioning operation.