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Indoor positioning system and positioning method for ultrasound radio frequency signal combined processing

A radio frequency signal and joint processing technology, applied in positioning, radio wave measurement system, measurement device and other directions, can solve the problem that the positioning technology cannot be used well

Inactive Publication Date: 2014-07-23
江苏坤研电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by conditions such as positioning time, positioning accuracy, and complex indoor environments, the relatively complete positioning technology cannot be well utilized at present.

Method used

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  • Indoor positioning system and positioning method for ultrasound radio frequency signal combined processing
  • Indoor positioning system and positioning method for ultrasound radio frequency signal combined processing
  • Indoor positioning system and positioning method for ultrasound radio frequency signal combined processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Both the anchor node and the mobile node described in the present invention can transmit and receive radio frequency and ultrasonic signals, so the positioning of the mobile node can be realized in two ways: the up-sending and down-receiving working mode and the down-sending and up-receiving working mode.

[0077] Now take the upper sending and lower receiving working mode as an example, the positioning diagram of the upper sending and lower receiving system is as follows Image 6 shown.

[0078] There is no limit to the number of mobile nodes in the up-sending and down-receiving working mode, as long as each mobile node receives at least 4 roof anchor nodes transmitting acoustic signals at the same time.

[0079] A mobile node can locate itself, and if others need to know its location, it should use a communication link to establish a link with the outside world.

[0080] There are two types of links in the system: radio frequency links and acoustic links.

[0081] R...

Embodiment 2

[0086] Now take the following work mode as an example. The positioning diagram of the sending and receiving system is as follows: Figure 7 shown.

[0087] The number of mobile nodes sending and receiving work modes depends on the encoding mode adopted by the system.

[0088] The mobile node only transmits positioning sound signals, and the data processing and positioning operations are completed by the display and control node.

[0089] There are two types of links in the system: radio frequency links and acoustic links.

[0090] Radio frequency links exist between all nodes such as anchor nodes, mobile nodes, and control nodes. It can be applied to the synchronization between the anchor node, mobile node and display control node, and is also responsible for the communication between the anchor node and the display control node. control node.

[0091] The acoustic link exists between the anchor node and the mobile node, and the ultrasonic signal can only be sent from the ...

Embodiment 3

[0096] Figure 4 The block diagram of ultrasonic transmission is given, and the digital part mainly includes three parts: digital code signal generation, code pulse shaping and code signal modulation. The generated digital waveforms can be stored in registers and transmitted at regular intervals by the controller.

[0097] The Gold sequence is selected as the baseband signal.

[0098] As a broadband pseudo-random noise signal, the Gold sequence has the optimal ambiguity function characteristic—the pushpin shape, that is, the optimal distance estimation accuracy and velocity estimation accuracy, and is independently determined by the signal bandwidth B and pulse width T, namely:

[0099] Distance resolution:

[0100] Velocity resolution:

[0101] As long as the frequency response (flat and broadband) of the ultrasonic transmitting transducer is acceptable, the distance resolution can be further improved by increasing the bandwidth of the transmitting signal. Speed ​​res...

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Abstract

The invention discloses an indoor positioning system and positioning method for ultrasound radio frequency signal combined processing. The indoor positioning system comprises three kinds of basic nodes which are anchor nodes, mobile nodes and display control nodes. The anchor nodes are fixed nodes with spatial positions known, the mobile nodes are active nodes with position coordinates needing to be determined in space, and the display control nodes display a system topological structure and node positioning results in real time and perform coordination control on the whole system. The anchor nodes and the mobile nodes perform contact by adopting radio frequency and ultrasonic signals, data processing is performed on received sound signals on the anchor nodes or the mobile nodes, spatial three-dimensional coordinates of the mobile nodes are solved, and system positioning results are finally displayed on the display control nodes. Compared with ultra-wideband radio frequency, WIFI radio frequency, video images and the like, the ultrasonic positioning system has the advantages of being prominent in performance, low in cost, high in privacy and free of electromagnetic pollution and is a first choice technology for indoor position services.

Description

technical field [0001] The invention relates to a system for realizing indoor moving target positioning based on ultrasonic radio frequency joint processing and a realization method thereof, belonging to the technical field of ultrasonic detection and positioning. Background technique [0002] With the rapid increase of data services and multimedia services, people's demand for positioning and navigation is increasing, especially in complex indoor environments, such as airport halls, exhibition halls, warehouses, supermarkets, libraries, underground parking lots, mines, etc. , it is often necessary to determine the location information of the mobile terminal or its holder, facilities and objects indoors. However, limited by conditions such as positioning time, positioning accuracy, and complex indoor environments, relatively complete positioning technologies cannot be well utilized at present. Therefore, experts and scholars have proposed many indoor positioning technology ...

Claims

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Application Information

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IPC IPC(8): G01S5/18
CPCG01S5/18
Inventor 李建
Owner 江苏坤研电子科技有限公司
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