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Method for frequency error correction of oscillator of sensor node of wireless sensor network

A sensor node, sensor network technology, applied in the demodulation of angle modulation oscillation, frequency demodulator arrangement, transmission system and other directions, can solve the problems of insufficient accuracy and impossible indoor application.

Inactive Publication Date: 2018-11-09
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
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AI Technical Summary

Problems solved by technology

However, the achievable accuracy is often insufficient and indoor applications are not possible

Method used

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  • Method for frequency error correction of oscillator of sensor node of wireless sensor network
  • Method for frequency error correction of oscillator of sensor node of wireless sensor network
  • Method for frequency error correction of oscillator of sensor node of wireless sensor network

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Embodiment Construction

[0047] Synchronization of the local reference oscillators of individual sensor nodes is necessary for many localization methods of sensor nodes. Regarding synchronization, a distinction must be made between frequency synchronization and time synchronization. The purpose of frequency synchronization is to bring the frequencies of the local reference oscillators of the individual sensor nodes into synchronous operation or to determine deviations from an external reference frequency. Time synchronization should be understood as the calibration of the different local clock times of the individual sensor nodes with an external reference time.

[0048] Based on the knowledge that radio broadcast signals and mobile radio signals used as signals of opportunity are usually generated relative to and thus form a highly accurate reference frequency (OCXO, rubidium-frequency standard, etc.) The local reference oscillators of several sensor nodes are frequency synchronized. The purpose of...

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Abstract

The invention relates to a method for the frequency error correction of an oscillator of a sensor node in a sensor network, comprising the following steps: receiving a transmission signal of a transmitter, the signal being modulated by orthogonal frequency division multiplexing (OFDM); determining the frequency deviation of the oscillator using the received transmission signal; and determining a correction signal for correcting the frequency deviation of the oscillator and correcting the frequency of the oscillator by means of the correction signal.

Description

technical field [0001] The invention relates to a frequency correction (tuning) method of a local reference oscillator of a sensor node of a sensor node network. Background technique [0002] Wireless sensor networks are becoming more and more important in our daily life. Meter readings for gas and water meters are now often taken wirelessly by mainline operators. Likewise, facilities in production or logistics are often equipped with wireless sensors. Sensors with a communication unit for transmitting sensor data and possibly other data are referred to as sensor nodes. Multiple sensor nodes in a specific area can form a sensor network. [0003] Knowledge of the precise location of sensor nodes is especially important for many applications. The position of a sensor node is usually determined by a network of stationary receivers, wherein such receivers can also be components of the sensor nodes of the sensor network. The precise position of a sensor node to be located ca...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L7/00H03D3/00
CPCH03D3/004H04L27/2657H04L27/2675H04L27/2695H03L7/189
Inventor 汉斯-马丁·特罗格诺伯特·弗兰克阿尔贝特·赫伯格约尔格·罗伯特
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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