A TDoA-based LoRa device tracking method

By using a LoRa device tracking method based on TDoA and employing FFT calculation and synchronization technology, the problem of insufficient security in LoRa device positioning is solved, achieving accurate device tracking and reducing computational complexity, making it suitable for low-cost devices.

CN117858019BActive Publication Date: 2026-07-21ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2023-12-19
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing LoRaWAN technology lacks effective covert tracking methods for IoT device location security, especially in terms of insufficient research on physical security against location leakage, which poses a potential risk of physical damage.

Method used

Using a TDoA-based approach, LoRa signals are received by wireless devices and FFT calculations are performed to obtain the signal arrival time difference. Multiple synchronization devices are used for positioning. A method for accurately obtaining the signal reception time and a synchronization mechanism between wireless devices are designed to achieve the tracking and positioning of LoRa devices.

Benefits of technology

It achieves precise tracking and positioning of LoRa devices, reduces computational load, is suitable for low-performance and low-cost devices, and has practical value and stealth capabilities.

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Abstract

The application discloses a LoRa device tracking method based on TDoA, mainly solves the problem of device position information tracking in the existing low-power wide-area network environment, and realizes the steps including: receiving the LoRa signal of a target device through a radio device; selecting a suitable window size through fast Fourier transform, calculating the frequency domain information of a target frequency band, taking the unit sampling time of the device as the unit time of the collected signal frame, and determining the specific time of signal arrival; synchronizing two radio devices located at different positions; for the collection of the same signal, obtaining the time difference of the same signal arriving at different positions; and tracking the target LoRa device by using a TDoA positioning algorithm. The application designs a LoRa device tracking method based on TDoA, designs the accurate acquisition of signal receiving time, designs a synchronization method of multiple radio devices, and realizes the tracking and positioning of the LoRa device, so that the operation method is simple and clear, and has practical value.
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