Selective Satellite Time Data Reception for Power Reduction
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Solution Overview
Problem
Existing methods for obtaining date and time information from positioning satellites consume excessive power and increase the load on electronic devices, particularly when receiving radio waves.
Innovation Solution
An electronic device with a clocking unit, a receiving unit, and a reception control unit that selectively receives only the first date and time information from a positioning satellite, using internal date and time information to calculate and correct the date and time, thereby reducing power consumption and reception time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If date and time information is obtained by receiving transmitted radio waves from positioning satellites, then accurate date and time information can be obtained, but power consumption increases excessively
Solution Approach 1:
The patent extracts only the necessary first date and time information (unit width 1 second) from the positioning satellite radio waves, while omitting the second date and time information (unit width 1 week). This selective extraction approach obtains sufficient accuracy for the intended purpose while dramatically reducing the data processing load and power consumption associated with receiving and processing complete date and time information from satellites.
2Measurement precision
If complete date and time information from positioning satellites is received, then accurate date and time can be obtained, but the load on electronic devices increases
Solution Approach 1:
The patent extracts only the first date and time information from the positioning satellite transmissions, leaving out the second date and time information. This selective extraction reduces the amount of data that must be received, decoded, and processed, thereby reducing the processing load on electronic devices while still providing sufficient date and time accuracy for most applications.
Solution Approach 2:
The patent segments the date and time information into two distinct components: first date and time information (unit width 1 second) and second date and time information (unit width 1 week). By processing only the first segment for most applications, the system achieves a balance between accuracy requirements and processing capability, avoiding the need to handle the complete information set.
Data Source
AI summary
An electronic device includes a clocking unit; a receiving unit; a reception control unit; and a date and time obtaining unit. The reception control unit makes the receiving unit receive first date and time information which is transmitted from a positioning satellite, the first date and time information indicating an elapsed time from a start of a week to an end of the week, and the reception control unit does not make the receiving unit receive second date and time information which is transmitted from the positioning satellite, the second date and time information indicating a week number. The date and time obtaining unit calculates an uncorrected date and time based on the first date and time information and a clocking unit week number which is a week number calculated from date and time counted by the clocking unit.