Passive type moving target locating method on the basis of Doppler frequency shift

A Doppler frequency shift and moving target technology, which is applied in the field of passive positioning and passive moving target positioning based on Doppler frequency shift, can solve the problems that the positioning accuracy cannot be well guaranteed, and the communication overhead of positioning accuracy is small.

Active Publication Date: 2014-10-01
NORTHWEST UNIV(CN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Passive type moving target locating method on the basis of Doppler frequency shift
  • Passive type moving target locating method on the basis of Doppler frequency shift
  • Passive type moving target locating method on the basis of Doppler frequency shift

Examples

Experimental program
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Embodiment

[0197] In this embodiment, the working frequency of the beacon is 10Ghz, and 1000 positioning experiments are performed.

[0198] This embodiment provides a passive positioning method based on Doppler frequency shift, and the specific parameters are as follows:

[0199] The scene setting of step 1: In a propagation environment without any occlusion, except for the positioning target, there are static objects in the environment. 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 respectively from left to right. Three beacons The spacing is equal to d = 2 meters, FMT uses N = 32 to indicate the number of sub-channels, the channel bandwidth is 1 MHz, and the sub-channel is a narrowband signal of 31.25 kHz. Each beacon contains Directional antennas, the distance between these directional antennas in the coverage direction is The direction range of...

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Abstract

The invention provides a passive type moving target locating method on the basis of Doppler frequency shift. The method comprises the specific steps that firstly, a scene is set; secondly, a locating signal is generated; thirdly, the locating signal is located, a locating angle is determined; fourthly, angle information, corresponding to a directive antenna, of three beacons is determined according to sub-channel designators stored by the three beacons, and therefore the position of a moving target is determined. According to the method, the directions, relative to the three beacons, of the target can be determined according to Doppler influence on beacon sending frequency from movement of the moving target, the single moving target can be located in the passive locating scene, little locating equipment, short locating time and low locating cost are used, and the effect of locating the passive type moving target is improved.

Description

Technical field [0001] The invention belongs to the field of wireless network positioning, and specifically relates to a passive positioning method, in particular to a passive mobile 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 wireless network applications. For example, it can be used in security and intrusion detection systems, wildlife detection, shopping and retail habits analysis, and 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 for passive positioning of targets, which are roughly divided into the following three categories: [0003] The first method is based on non-radio signal posi...

Claims

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Application Information

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Patent Type & Authority Applications(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(CN)
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