Electronic timepiece, satellite signal receiving device, and method for controlling satellite signal receiving device

A satellite signal receiving device comprising:

• a receiving unit receiving at least one of satellite signals transmitted from a plurality of satellites, converting the satellite signal into a digital signal, and outputting the digital signal;
• a baseband unit configured to
• store the digital signal as a signal sample,
• using a plurality of correlators, execute correlation computation processing of sequentially computing a correlation value between the signal sample and a plurality of codes corresponding to the plurality of satellites, and
• store a result of correlation computation by plurality of correlators;
• and
• a power supply supplying electric power from a power source to the receiving unit and the baseband unit;
• wherein the baseband unit is further configured to
• using a power source voltage determination circuit, (i) detect a first voltage of the power source prior to starting the correlation computation processing, (ii) determine whether the detected first voltage is lower than a first threshold, (iii) detect a second voltage of the power source during the correlation computation processing, (iv) determine whether the detected second voltage exceeds a second threshold set to be equal to or higher than the first threshold, (v) detect a third voltage of the power source subsequent to interrupting the correlation computation processing, and (vi) determine whether the detected third voltage exceeds a third threshold set to be equal to or higher than the second threshold, and
• using a baseband control unit, control the plurality of correlators to interrupt the correlation computation processing when the power source voltage determination circuit determines that the second voltage is lower than the second threshold, and to resume the correlation computation processing when the power source voltage determination circuit determines that the third voltage exceeds the third threshold.

A method for controlling a satellite signal receiving device, the device including:

• a receiving unit receiving at least one of satellite signals transmitted from a plurality of satellites, converting the satellite signal into a digital signal, and outputting the digital signal;
• a baseband unit storing the digital signal as a signal sample, executing correlation computation processing of sequentially computing a correlation value between the signal sample and a plurality of codes corresponding to the plurality of satellites using a plurality of correlators, and storing a result of correlation computation by the plurality of correlators;
• a power supply supplying electric power from a power source to the receiving unit and the baseband unit;
• and a power source voltage determination circuit configured to (i) detect a first voltage of the power source prior to starting the correlation computation processing, (ii) determine whether the detected first voltage is lower than a first threshold, (iii) detect a second voltage of the power source during the correlation computation processing, (iv) determine whether the detected second voltage exceeds a second threshold set to be equal to or higher than the first threshold, (v) detect a third voltage of the power source subsequent to interrupting the correlation computation processing, and (vi) determine whether the detected third voltage exceeds a third threshold set to be equal to or higher than the second threshold,
• the method comprising:
• interrupting the correlation computation processing by the plurality of correlators when the power source voltage determination circuit determines that the second voltage is lower than the second threshold;
• and
• resuming the correlation computation processing by the plurality of correlators when the power source voltage determination circuit determines that the third voltage exceeds the third threshold.