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Synchronous data acquisition method based on wireless sensor network

A wireless sensor and data synchronization technology, applied in the field of communication, can solve the problems of large positioning position deviation, time synchronization error, and cooperative signal performance degradation, so as to ensure time synchronization, reduce time synchronization error, improve accuracy and robustness Effect

Active Publication Date: 2012-08-01
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existence of these problems leads to errors in the time synchronization of each sensing node, which will lead to mistimed detection of cooperative signal detection and performance degradation, which will further lead to large positioning position deviations and other results.

Method used

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  • Synchronous data acquisition method based on wireless sensor network
  • Synchronous data acquisition method based on wireless sensor network
  • Synchronous data acquisition method based on wireless sensor network

Examples

Experimental program
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Embodiment 1

[0049] The present invention is a synchronous data acquisition method based on wireless sensor network. In the application of wireless sensor network, sensor nodes usually need to coordinate and operate together to complete a complex sensing task. For example, if there is a microsecond-level error in time, the Leading to the accuracy of the positioning system, different time offsets will affect the accuracy of the signal.

[0050] The present invention adopts the hardware platform that FPGA and ARM combine, because adopt 32 EBI (External Bus Interface) buses to carry out data transmission between FPGA and ARM, transmission frequency can reach 133MHz, throughput efficiency is extremely high, so between FPGA and ARM Data transmission does not need to subpackage or recombine data, and then when uploading spectrum data, positioning data or detection data, time stamp information can be added to the header of the entire packet of data. The wireless sensor network consists of a manag...

Embodiment 2

[0078] The synchronous data acquisition method based on wireless sensor network is the same as embodiment 1, and the effect of the present invention can also be further proved by the following simulation examples:

[0079]Use VHDL language in Quartus II to realize the functions of time-scale synchronization module, time-scale maintenance module, time-scale correction module and self-renewal module, and use VWF (Vector Wave File) files to simulate the functions of each module.

[0080] The simulation time scale maintenance module does not change the time information of the minute carry, and the simulation results are as follows Figure 6 (1) shown.

[0081] From Figure 6 (1) It can be seen that the three times of coordination and synchronization of PPS and GPS timing information are realized at about 650ms, and the time scale maintenance module starts to work from the synchronization time, and maintains the current time scale with 60MHz, and the timing accuracy can reach 16.6...

Embodiment 3

[0084] The synchronous data acquisition method based on the wireless sensor network is the same as embodiment 1 and example 2, and the effect of the present invention can also be further proved by the following simulation examples:

[0085] The simulation time scale maintenance module has time information changes in minute increments, and the simulation results are as follows Figure 6 as shown in (2);

[0086] From Figure 6 (2) It can be seen that the PPS and GPS timing information has been coordinated and synchronized for three times at about 650ms. The time scale maintenance module starts to work from the synchronization time, and maintains the current time scale with 60MHz. The timing accuracy can reach 16.67ns. The second information is incremented at intervals of 1, Figure 6 (2) In the case where the time information has minute carry, the time scale maintenance module ensures the accuracy of the time information in the sensing node.

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Abstract

The invention discloses a synchronous data acquisition method based on a wireless sensor network, which mainly solves the problems of detection error, positioning error caused and the like by GPS (Global Positioning System) timing error. In the method disclosed by the invention, PPS(Pulses Per Second) and GPS timing information are harmonized to be synchronous for three times so as to reach time synchronization of all the sensing nodes; a peak window method is adopted to judge the PPS State legitimacy so as to ensure time synchronization; a high-speed clock is used to maintain a local time scale so as to decide whether to amend the current time scale in real time; and automatic updates are conducted each 40 seconds. If the acquisition time point required by an FPGA(Field Programmable Gate Array)analytical management center is ahead of the current time scale, a time overflow error is reported to inform the management center to give a command again; if the acquisition time point required by the FPGA analytical management center is behind the current time scale, a receiver is turned off at time of one second before the next acquisition time point; the receiver is turned on to acquire the data at the time point required by the management center. With the method disclosed by the invention, the accuracy and the robustness of GPS timing of the sensing nodes of the wireless sensor network are improved. The method is applicable in collaborative signal detection and positioning data acquisition of the nodes of the wireless sensor network and the like.

Description

technical field [0001] The invention belongs to the technical field of communication, and mainly relates to a synchronous data acquisition method in wireless communication, in particular to a synchronous data acquisition method based on a wireless sensor network, which can be used in the wireless sensor network to realize synchronous data acquisition. Background technique [0002] Now in communication, wireless sensor network has gradually become a hotspot of information perception research because of its low power consumption, low cost, distributed and self-organizing characteristics. Sensor networks can realize data collection and quantification, processing fusion and transmission applications, and have been used in military, environmental monitoring, industrial control and other fields. Wireless sensor network technology has been rated as the top ten emerging technologies that have a profound impact on human future life. . [0003] Time synchronization is an important pa...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/18
Inventor 司江勃齐佩汉李赞李真季雷孙哲郝本建高锐
Owner XIDIAN UNIV
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