Time Display Apparatus Destination Time Zone Lock
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Solution Overview
Problem
Existing time display apparatuses for moving objects, such as airplanes, face issues with unintended time changes due to GPS signals received during travel, leading to incorrect time zone displays.
Innovation Solution
A time display apparatus with a processor that selectively executes processes based on received wireless signals and satellite positioning, prohibiting GPS reception until a predetermined condition is met, ensuring accurate time zone display by prioritizing destination time zone information over current location time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device uses GPS positioning to display time based on current location, then the time display reflects the actual geographical position, but the time changes unintendedly when the device enters a different time zone during flight
Solution Approach 1:
The system performs preliminary action by acquiring destination information and determining the corresponding time zone before the flight reaches the destination. The processor proactively sets the display time based on the predetermined destination time zone, rather than waiting for the device to automatically detect time zone changes through GPS positioning. This prevents unintended time changes during the flight process.
2Adaptability or versatility
If the terminal device continuously uses GPS for time zone detection during flight, then the time display remains updated, but power consumption increases
Solution Approach 1:
The system implements periodic action by acquiring destination information at specific intervals during the flight process. Instead of continuously using GPS for time zone detection, the processor periodically checks for updated destination information and adjusts the time display accordingly. This reduces power consumption while maintaining appropriate time display adaptability throughout the flight.
3Ease of operation
If the system switches between multiple time zone information sources, then the time display can be optimized, but the system complexity increases
Solution Approach 1:
The system extracts and prioritizes the most relevant time zone information by taking out destination information as the primary source for time display. The processor extracts destination information from available data sources and uses this as the basis for determining the time zone, while suppressing or ignoring other potentially conflicting time zone information sources (such as current GPS location). This simplifies the system logic while maintaining ease of operation.
Data Source
AI summary
A time display apparatus includes a display section that displays the time, a first receiver that receives a wireless signal containing information on the time zone corresponding to a destination from a transmitter provided in a moving object, a second receiver that receives a satellite signal from a positioning satellite to perform positioning and calculates position information, and a processor that is capable of selectively executing a first process of setting time to be displayed on the display section based on the time zone information and a second process of setting the time to be displayed on the display section based on the position information and does not execute the second process for the period until the processor determines that a predetermined condition is satisfied in a case where the first receiver has received the wireless signal.