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A Passive Moving Target Location Method Based on Doppler Frequency Shift

A technology of Doppler frequency shift and moving target, which is applied to passive moving target positioning based on Doppler frequency shift and passive positioning field, can solve the problems of small communication overhead of positioning accuracy and insufficient guarantee of positioning accuracy.

Active Publication Date: 2016-05-25
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the existing passive positioning methods cannot be well applied to the scene of passive positioning of moving targets, especially for the positioning of low-speed targets, and the positioning accuracy cannot be well guaranteed. target, a passive positioning method with high positioning accuracy and low communication overhead is necessary

Method used

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  • A Passive Moving Target Location Method Based on Doppler Frequency Shift
  • A Passive Moving Target Location Method Based on Doppler Frequency Shift
  • A Passive Moving Target Location Method Based on Doppler Frequency Shift

Examples

Experimental program
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Embodiment

[0196] In this embodiment, the operating frequency of the beacon is 10Ghz, and 1000 positioning experiments are performed.

[0197] This embodiment provides a passive positioning method based on Doppler frequency shift, and the specific parameters are as follows:

[0198] Scene setup in step 1: In a propagation environment without any occlusion, there are still objects in the environment except for the positioning target. The environment is composed of several square positioning units. Three beacons with known positions form a unit. The three beacons in the unit are marked as Beacon X, Beacon A, and Beacon Y from left to right. Three Beacons The spacing is equal to d=2 meters, FMT uses N=32 to represent the number of sub-channels, the channel bandwidth is 1MHz, and the sub-channel is a narrow-band signal of 31.25kHz. Each beacon contains Directional antennas, the spacing of these directional antennas in the coverage direction is The direction range of the directional anten...

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Abstract

The present invention provides a passive moving target positioning method based on Doppler frequency shift, which is specifically carried out according to the following steps: Step 1, scene setting; Step 2, generation of positioning signals; Step 3, positioning signal reception and positioning angle determination Step 4: Determine the angle information of the directional antenna corresponding to the beacon according to the sub-channel numbers saved by the three beacons, so as to determine the position of the moving target. The method can determine the direction of the target relative to the three beacons only according to the Doppler influence of the target movement on the beacon transmission frequency, and complete the positioning of a single moving target in a passive positioning scenario, while using less positioning equipment and and positioning time cost, while improving the effect of mobile passive target positioning.

Description

technical field [0001] The invention belongs to the field of wireless network positioning, in particular to a passive positioning method, in particular to a passive moving target positioning method based on Doppler frequency shift. Background technique [0002] Compared with active positioning methods (such as global positioning system (GPS), radio frequency identification (RFID), FM-based positioning methods), passive positioning without equipment has become a hot spot in many applications of wireless networks. For example, use it in security and intrusion detection systems, wildlife detection, analysis of shopping and retail habits, assistance for the elderly or disabled. In these scenarios, the positioning target avoids or is inconvenient to carry any equipment. At present, there are many research methods on target passive positioning, which can be roughly divided into the following three categories: [0003] The first method is based on non-radio signal positioning: th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/50G01S13/66
CPCG01S5/0231G01S5/0289G01S5/04
Inventor 赵康陈晓江聂卫科王举房鼎益张远任宇辉邢天璋王亮
Owner NORTHWEST UNIV
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