Method and device for equipment-free target positioning based on radio frequency tomography
A radio frequency tomography, no-equipment-targeted technology, applied in specific environment-based services, positioning, measurement devices, etc., can solve problems such as the robustness of shadow fading models, lack of adaptability to complex environments, and RSS values being easily affected by the environment. , to weaken the interference of background noise and false targets, improve positioning performance, and enhance the effect of influence
Active Publication Date: 2022-03-22
淮安中科晶上智能网联研究院有限公司
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[0007] However, because the RSS value is easily affected by the environment, coupled with the lack of robustness of the shadow fading model in RTI and the lack of adaptability to complex environments, RTI imaging results are always accompanied by background noise and false targets
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[0063] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0064] (1) 2.4GHz frequency band signal.
[0065] Due to the fast propagation speed of the 2.4GHz frequency band signal, the RSS value changes significantly when there is occlusion, and 2.4GHz is close to the oscillation frequency of human water molecules, so many DFL WSNs are established in the 2.4GHz frequency band. Although the 2.4GHz frequency band signal has good positioning performance in some small-scale open areas, it also has inherent disadvantages such as short transmission distance, large transmission attenuation, and weak sig...
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The invention discloses a device-free target positioning method and device based on radio frequency tomography. The method includes: performing multi-band wireless sensor network networking in a monitoring area; the wireless sensor network networking includes networking nodes and acquisition nodes ; The networking nodes of each frequency band communicate with each other to form multiple wireless links to scan the entire monitoring area at the same time, and send the signal reception strength value of the received signal to the collection node; the collection node uses the signal reception strength value to calculate respectively The RTI results of each frequency band; and use the communication quality information as a standard to perform weighted fusion on the RTI result maps of the three frequency bands, and locate the target position according to the fused RTI result maps. The invention utilizes the complementary advantages of each frequency band to improve the positioning performance of the DFL; combined with the RTI fusion technology, it weakens the interference of background noise and false targets, enhances the influence of real targets, and improves the target detection accuracy.
Description
technical field [0001] The present invention relates to the technical field of device-free localization (Device-free Localization, DFL), in particular to a device-free localization method and device based on radio frequency tomography. Background technique [0002] With the advancement of wireless communication and mobile computing, positioning technology has been greatly popularized and developed, for example, positioning and tracking of passengers in online car-hailing services, navigation services inside large buildings, product positioning detection in large warehouses, etc. . [0003] At present, positioning technology is divided into active positioning (active positioning) and passive positioning (passive positioning). Active positioning requires the target to be positioned to carry corresponding equipment, send signals to communicate with the base station or server, so as to invert the position of the target; GPS is the most widely used active positioning technology,...
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IPC IPC(8): H04W4/38H04W64/00G01S5/02
CPCH04W4/38H04W64/00G01S5/0252
Inventor 高颂徐玮巍程相权张大霖袁尧石晶林
Owner 淮安中科晶上智能网联研究院有限公司