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A positioning method of radiofrequency tomography that mitigates the influence of background electromagnetic waves

A technology of radio frequency tomography and positioning methods, applied in positioning, radio wave measurement systems, electrical components, etc., can solve problems such as low imaging quality, electromagnetic wave signals are easily affected by the environment, and the real target position cannot be judged. The effect of reducing computing resources and storage resources, improving accuracy and robustness

Active Publication Date: 2019-07-02
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0006] The RTI positioning method has a high degree of intuition, but because the electromagnetic wave signal is easily affected by the environment, the influence of the background electromagnetic wave on the positioning performance
Even when there is no target, the measured Received Signal Strength (RSS) will be affected by various environmental factors (such as multipath effects, channel fading, temperature, humidity changes, etc.), resulting in poor imaging quality and severe Sometimes it is impossible to judge the position of the real target or treat the false target as the real target

Method used

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  • A positioning method of radiofrequency tomography that mitigates the influence of background electromagnetic waves
  • A positioning method of radiofrequency tomography that mitigates the influence of background electromagnetic waves
  • A positioning method of radiofrequency tomography that mitigates the influence of background electromagnetic waves

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Embodiment

[0092] Based on the CC2530 wireless transceiver chip, the positioning node is independently developed. The positioning area is a square area of ​​21 feet by 21 feet, such as figure 2 As shown, one wireless communication node is placed at 3 feet, and there are a total of 29 wireless communication nodes. Each positioning module is supported by a bracket with a height of 3 feet, which ensures that the height of the sending space area of ​​positioning data is similar to the height of the human body. Among them, 28 wireless communication nodes form a measurement network, and another wireless communication node is used as a data acquisition node. In terms of software protocol, this embodiment is based on the wireless communication protocol of IEEE802.15.4, and in the application layer of the Z-stack protocol stack, codes for sending messages and extracting strength values ​​after receiving messages are added. The 28 measurement modules are numbered with ID numbers from 1 to 28 in ...

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Abstract

The invention discloses a radio frequency tomography positioning method capable of relieving the influence of background electromagnetic waves. The radio frequency tomography positioning method has the advantages that a background received signal strength (RSS) measuring result is divided into a background noise part and an environment inherent influence part through a singular value decomposition manner, the environment inherent influence is removed during imaging, and the influence of environment change on imaging quality is minimized; according to the feature that RSS change of wireless links influenced by a target is evident and the RSS change of the wireless link not influenced by the target is relatively small, the principle of maximum distance between classes is used to divide measured wireless links into effective links influenced by the target and ineffective links not influenced by the target, only the effective links are used to perform imaging during positioning, calculation resources and storage resources needed can be reduced, influence of outlier links on the positioning result can be removed during solving, and accuracy and robustness of the positioning result can be increased.

Description

technical field [0001] The invention relates to a radio frequency tomography positioning method for reducing the influence of background electromagnetic waves, and belongs to the technical field of wireless positioning. Background technique [0002] At present, positioning-based services have covered many fields such as smart cities, search and rescue, intelligent transportation, navigation and aviation, logistics management, geodetic surveying, marine surveying and mapping, meteorological surveying, disaster prevention, medical services, etc., and positioning and navigation technology has become a guarantee One of the necessary means of national security and military operations. [0003] Among the many wireless positioning systems, the most famous is the positioning system that sets radio transmission sources on various orbiting satellites, such as the Global Positioning System (GPS) in the United States, the Galileo system in Europe, the GLONASS system in Russia, and the C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00G01S5/02
CPCG01S5/021G01S5/0252H04W64/00
Inventor 王婷婷柯炜倪海彬
Owner NANJING UNIV OF INFORMATION SCI & TECH
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