Disaster Noticing Server Time Remaining Calculation
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Solution Overview
Problem
Current disaster noticing systems fail to accurately calculate the time remaining until a natural disaster reaches a disaster reporting terminal, especially when the current time measured at the terminal is incorrect or subject to communication delays.
Innovation Solution
A disaster noticing system comprising a server that calculates and transmits the expected time of arrival of a natural disaster to a reporting terminal, which then uses this information to accurately determine the time remaining, even if its internal clock is inaccurate, by comparing it to a checking time or announcement time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the current time measured at the disaster reporting terminal is used to calculate the time remaining, then the calculation is simple, but the result is inaccurate when the terminal clock is incorrect or subject to communication delays
Solution Approach 1:
The patent introduces an intermediary time reference mechanism where the server provides a reference time (announcement time or checking time) that mediates between the server's authoritative time and the terminal's local time. This intermediary reference allows the terminal to calculate time remaining accurately without directly trusting its own potentially inaccurate clock, thus resolving the contradiction between simple calculation and accurate measurement.
2Measurement precision
If the server calculates and transmits the expected time of arrival, then the time remaining can be calculated accurately even with terminal clock errors, but the system complexity increases
Solution Approach 1:
The server performs preliminary calculations of the expected time of arrival and provides reference times (announcement time or checking time) to the terminal in advance. This preliminary action allows the terminal to simply subtract the reference time from the expected arrival time without needing complex clock synchronization mechanisms, thus achieving accurate time remaining calculation while keeping the terminal relatively simple.
3Ease of operation
If the terminal uses its internal clock to determine current time, then the operation is independent and simple, but errors due to clock inaccuracies cannot be avoided
Solution Approach 1:
The system implements a feedback mechanism where the server provides reference times (announcement time or checking time) back to the terminal. The terminal uses this feedback reference time to verify and correct its local time measurements, thereby maintaining operational independence while improving time measurement reliability through external validation.
Data Source
AI summary
The disaster information system according to the invention includes a disaster noticing server and a disaster reporting terminal. The disaster noticing server calculates the expected time of arrival at which the natural disaster will arrive at the current location of the disaster reporting terminal, and transmits the calculated expected time of arrival to the disaster reporting terminal. The disaster reporting terminal, when it receives the expected time of arrival from the disaster noticing server, acquires the current time measured at the disaster reporting terminal, and calculates the time remaining until the natural disaster will arrive at the disaster reporting terminal from the expected time of arrival and the current time.