Low-Power Localization Using Wi-Fi Scans and Sleep Cycling
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Solution Overview
Problem
Existing movement tracking and tracing systems face challenges in explosive environments due to strict power consumption and radio frequency transmission limits, necessitating compliance with standards like IEC 60079-0:2017, while maintaining effective personnel location and tracking capabilities.
Innovation Solution
A localization device with low-power circuitry, utilizing a wireless communication antenna, satellite geospatial location module, and controller to determine environment type, generate location indication data, and enter sleep mode, achieving low power consumption through hardware and software optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the localization device operates continuously to track personnel location, then the tracking accuracy and reliability are improved, but the power consumption increases beyond the safe threshold for explosive environments
Solution Approach 1:
The localization device implements periodic location updates instead of continuous transmission. The controller is configured to send location indication data to the location database at predetermined intervals, allowing the device to maintain tracking functionality while consuming power only periodically rather than continuously, thus staying within the 1.3W safety threshold for explosive environments.
2Use of energy by moving object
If the device uses sleep mode to reduce power consumption, then the power safety requirement is met, but the location tracking responsiveness deteriorates
Solution Approach 1:
The device dynamically adjusts its operational state between active and sleep modes based on timing requirements. The controller activates the device at predetermined intervals to send location data, then enters sleep mode. This dynamic switching allows the device to meet power safety requirements while maintaining acceptable location tracking responsiveness through timely periodic updates.
3Reliability
If the wireless transmission power is increased to improve communication range, then the location data transmission reliability is improved, but the device exceeds the radio frequency power limits for explosive environments
Solution Approach 1:
The device transmits location data in periodic bursts rather than maintaining continuous high-power transmission. By sending location indication data at predetermined intervals using low-power wireless communication, the device achieves sufficient communication reliability for tracking purposes while keeping the radio frequency power consumption within the 1.3W safety limit required for explosive environments.
Data Source
AI summary
A localization device comprises: a wireless communication antenna; a satellite geospatial location module configured to determine a location of the localization device from signals received from geospatial location satellites; and a controller configured to: control the wireless communication antenna to scan wireless access points in a vicinity of the localization device and determine wireless network data corresponding to identified wireless access points; use the wireless network data to determine an environment type in which the localization device is located from an indoor environment in which signals cannot be received from geospatial location satellites and an outdoor environment in which signals can be received from geospatial location satellites; generate location indication data for the localization device, the location indication data depending on the environment type in which the localization device is located; control the wireless communication antenna to send the location indication data to a location database via one of the identified wireless access points; and cause the localization device to enter a sleep mode.