US 11,726,434 B2
Satellite radiowave receiving device, electronic timepiece, positioning control method, and recording device
Takeshi Matsue, Kokubunji (JP); and Tatsuya Sekitsuka, Kunitachi (JP)
Assigned to CASIO COMPUTER CO., LTD., Tokyo (JP)
Filed by CASIO COMPUTER CO., LTD., Tokyo (JP)
Filed on Sep. 24, 2018, as Appl. No. 16/139,245.
Claims priority of application No. JP2017-183256 (JP), filed on Sep. 25, 2017.
Prior Publication US 2019/0107814 A1, Apr. 11, 2019
Int. Cl. G01S 19/25 (2010.01); G04R 20/04 (2013.01)
CPC G04R 20/04 (2013.01) [G01S 19/256 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A satellite radiowave receiving device comprising:
a processor, wherein the processor obtains first date and time information included in radiowaves received via a receiver from a single positioning satellite which is acquired first after a start of receipt of radiowaves,
wherein, in response to the processor receiving radiowaves via the receiver from multiple satellites which include the single positioning satellite and which are required for a positioning calculation, the processor modifies second date and time information which is counted by a clock circuit using the first date and time information,
wherein the processor performs the positioning calculation using the second date and time information of the multiple positioning satellites and a predicted orbit data retrieved from a memory of the device, and
wherein the predicted orbit data is collected and retained in the memory before the obtaining of the radiowaves for retrieval.