GNSS Power Management for Portable Emergency Devices
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Solution Overview
Problem
Portable devices in emergency response systems face high power consumption due to continuous operation of GNSS receivers in full power mode, which is unnecessary during normal conditions, leading to reduced battery life.
Innovation Solution
Implement a power management method that places the GNSS receiver in low power or power-off mode during normal conditions and switches to full power mode only during emergencies, with the device sending location information from both wireless transceivers in a predefined sequence and priority, and automatically entering emergency mode if location information from the wireless transceiver is unavailable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GNSS receiver operates in full power mode continuously, then location information can be obtained at any time, but power consumption increases significantly
Solution Approach 1:
The GNSS receiver dynamically adjusts its operating mode based on system needs. In normal operation, it switches to low power mode or power-off mode to conserve energy. When emergency mode is detected (through missed location reports or SOS signals), it transitions to full power mode to ensure accurate location tracking, thus resolving the contradiction between continuous availability and power consumption
Solution Approach 2:
The system changes the operational parameters of the GNSS receiver based on detected conditions. By monitoring whether location information is received within expected time intervals, the system adjusts the power mode parameter of the GNSS receiver, switching between full power, low power, and power-off modes to balance reliability and energy usage
2Use of energy by moving object
If the GNSS receiver is placed in low power mode or power-off mode during normal operation, then power consumption is reduced, but location information cannot be obtained when needed
Solution Approach 1:
The system implements feedback monitoring through the central station that tracks whether location information is received from the portable device within expected time intervals. When location reports are missed or emergency signals are detected, the central station sends commands to switch the GNSS receiver to full power mode, ensuring location availability is restored when reliability is compromised by power-saving mode
Solution Approach 2:
The system prepares for potential emergencies by establishing monitoring mechanisms that detect when location information becomes unavailable. The central station proactively sends commands to activate full power mode before critical failures occur, based on patterns of missed location reports, thus preventing reliability issues before they escalate
3Measurement precision
If the device sends both wireless transceiver location information and GNSS location information in emergency mode, then location accuracy is improved, but data transmission complexity increases
Solution Approach 1:
The location data transmission is segmented into two distinct sources: wireless transceiver location information and GNSS receiver location information. Each source is processed and transmitted separately with defined priorities, allowing the system to manage complexity through structured segmentation while utilizing multiple data streams to improve overall location accuracy through comparison and validation
Data Source
AI summary
A power management method for a portable device including a global navigation satellite system (GNSS) receiver and a wireless transceiver includes: in a normal mode, sending at a first interval first location information obtained from the wireless transceiver to a central station in an emergency response system via the wireless transceiver, where the GNSS receiver is placed in a lower mode or a power-off mode; in an emergency mode, sending in a predefined sequence and priority the first location information obtained from the wireless transceiver and second location information obtained from the GNSS receiver to the central station via the wireless transceiver, wherein the GNSS receiver is placed in a full power mode; and in response to failing to obtain the first location information from the wireless transceiver at the first interval, entering the emergency mode and skipping sending the first location information to the central station.