WO2015188590A1

WO2015188590A1 - Wireless distance monitoring apparatus

Info

Publication number: WO2015188590A1
Application number: PCT/CN2014/091785
Authority: WO
Inventors: 王明; 郭振鹏; 李文波
Original assignee: 京东方科技集团股份有限公司
Priority date: 2014-06-12
Filing date: 2014-11-20
Publication date: 2015-12-17
Also published as: CN104111452A

Abstract

A wireless distance monitoring apparatus, comprising a main device (1) and sub-devices (2, 3), wherein the main device (1) and the sub-devices (2, 3) are separately arranged and an information transmission channel is established through a wireless network. The main device (1) is used for establishing a network, searching for and receiving wireless signals transmitted by the sub-devices (2, 3), and calculating the distance between the main device (1) and the sub-devices (2, 3) according to the intensity of the received wireless signals, and the sub-devices (2, 3) transmit the wireless signals to the main device (1) by adding into the network established by the main device (1). The wireless distance monitoring device can calculate the distance between the main device (1) and the sub-devices (2, 3) within a relatively small range, and facilitate the daily carrying and management of people, so that the real-time and effective distance monitoring can be realized.

Description

Wireless distance monitoring device

Technical field

The invention belongs to the field of wireless ranging, and particularly relates to a short-distance portable wireless distance monitoring device.

Background technique

With the development of technology, wireless positioning methods have become more and more mature, such as GPS positioning, ultrasonic positioning, infrared positioning, and radio frequency technology. These measurement techniques have different applications in different situations depending on cost, measurement distance and accuracy. For example, GPS positioning is based on satellite positioning technology, and the range of use is wide, but the terminal cost of the positioner is high; ultrasonic positioning and infrared positioning are easily affected by obstacles and interference, resulting in large measurement errors, and the test device is not movable; The technical measurement distance is short, generally tens of meters and does not have communication capabilities.

The monitoring of distance has an important application in daily life. Traditional distance measurement is based on wireless network and GPS positioning to obtain the location information of the monitored items, but these devices are costly and complicated to install, which is not convenient for people to carry and manage. For example, in daily life such as parents playing with children or walking with the owner and pets, the position of the parent and child or the owner and the pet may change at any time and there may be obstacles, so the corresponding positioning and ranging means cannot be realized in real time. Effective distance monitoring.

Therefore, there is a need for a low cost, small size, and portable device for distance monitoring.

Summary of the invention

The invention provides a wireless distance monitoring device, which is convenient for people to carry and manage on a daily basis to realize real-time effective distance monitoring.

According to an aspect of the invention, a wireless distance monitoring device is provided comprising a master device and a child device. The master device is disposed separately from the child device and establishes an information transmission channel through a wireless network. The master device is configured to assemble a network, search for and receive a wireless signal transmitted by the child device, and calculate the main device according to the strength of the received wireless signal. The distance between the sub-devices is set. The sub-device transmits a wireless signal to the primary device by joining a network formed by the primary device.

According to an embodiment of the invention, the primary device may comprise a first network module and a first control module, the child device may comprise a second network module and a second control module. The first network module is configured to assemble a network, search for, and receive a wireless signal transmitted by the second network module. The first control module includes a storage unit and a computing unit. The storage unit is configured to store an initial signal strength of the second network module, and the computing unit calculates a distance between the primary device and the child device according to the initial signal strength and the strength of the received wireless signal . The second control module includes a timing unit for causing a wireless signal transmitted by the second network module to be periodically transmitted.

According to an embodiment of the present invention, in the calculation unit, the distance between the main device and the sub-device can be calculated using the formula RSSI=A-10n·lg(d). The RSSI is the strength of the wireless signal received by the first network module; n is a network signal propagation constant, which is a fixed value; A is the initial signal strength; and d is between the primary device and the child device distance.

According to an embodiment of the present invention, the first control module may further include an averaging unit configured to perform an averaging calculation on the received strengths of the plurality of wireless signals to obtain an average strength of the wireless signals. The computing unit may calculate a distance between the primary device and the child device based on the initial signal strength and an average strength of the wireless signal.

According to an embodiment of the invention, the initial signal strength may be the strength of the wireless signal received by the first network module when the distance between the primary device and the child device is 1 m.

According to an embodiment of the invention, the first control module may further comprise a determining unit, and a preset safety distance may be pre-stored in the storage unit. The main device may further include a first alarm module, and the determining unit may determine whether the distance between the main device and the sub device is greater than or equal to the preset safety distance, when the main device The first alarm module alarms when the distance between the sub-devices is greater than or equal to the preset safety distance.

Alternatively or additionally, the sub-device may further include a second alarm module, and when the distance between the main device and the sub-device is greater than or equal to the preset security When the distance is full, the first network module may send an alarm signal to the second network module, so that the second alarm module alarms.

According to an embodiment of the invention, the alarm signal may be a PWM wave.

According to an embodiment of the invention, the first alarm module and the second quotation module may be audible buzzers and/or LED lights capable of color change/flicker.

According to an embodiment of the present invention, the wireless distance monitoring device may include a plurality of the sub-devices, each of the sub-devices having a respective identification, and the main device may calculate the main device and each of the sub-devices the distance between.

According to an embodiment of the invention, the first network module and the second network module may be infrared modules, and a ZigBee wireless network protocol may be adopted between the first network module and the second network module.

According to an embodiment of the present invention, the main device may include a first power module that provides a power source and a first crystal module that provides a clock signal, the first power module, the first crystal module, and the first network module And the first control module can be integrally arranged. The sub-device may include a second power module that provides a power source and a second crystal module that provides a clock signal, the second power module, the second crystal module, the second network module, and the second control module Can be set up in an integrated manner.

According to an embodiment of the invention, the primary device and the child device may each be a portable device. Alternatively, the primary device and the sub-device may be integrated on a wearable device, respectively, which may include a button, a brooch, a hairpin, a hat, a collar, a bracelet, an ankle bracelet, a stud, or glasses.

According to the wireless distance monitoring device of the present invention, the distance between the main device and the sub device can be calculated in a small range, and the distance monitoring can be performed, and the advantages of high integration, low power consumption, low cost, and low weight can be obtained. In addition, it is convenient for people to carry and manage on a daily basis to achieve real-time effective distance monitoring.

DRAWINGS

1 is a schematic diagram of the principle of a wireless distance monitoring device according to an embodiment of the present invention;

Figure 2 is a schematic block diagram of the main device of Figure 1;

Figure 3 is a schematic block diagram of the sub-device of Figure 1;

4 is a schematic diagram showing the workflow of the main device of FIG. 1;

FIG. 5 is a schematic diagram of the working process of the sub-device of FIG. 1.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the wireless distance monitoring device according to the embodiment of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

1 is a schematic diagram of the principle of a wireless distance monitoring device in accordance with an embodiment of the present invention.

As shown in FIG. 1, a wireless distance monitoring device according to an embodiment of the present invention may include a main device 1 and a plurality of

sub-devices

2 and 3. The main device 1 is separately provided from the

sub-devices

2 and 3 and establishes an information transmission channel through the wireless network.

The main device 1 is for building a network, searching for and receiving wireless signals transmitted by the

sub-devices

2 and 3, and calculating the distance between the main device 1 and the

sub-devices

2 and 3 based on the strength of the received wireless signals. The

sub-devices

2 and 3 transmit wireless signals to the main device 1 by joining a network built by the main device 1.

2 is a schematic block diagram of the main device 1 of FIG. 1, and FIG. 3 is a schematic block diagram of the

sub-devices

2 and 3 of FIG.

As shown in FIG. 2 and FIG. 3, the main device 1 includes a first network module 11 and a first control module 12, and the sub-device includes a second network module 21 and a second control module 22.

The first network module 11 is configured to assemble a network, search for and receive wireless signals transmitted by the second network module 21. The first control module 12 includes a storage unit 122 and a computing unit 121. The storage unit 122 is configured to store the initial signal strength of the second network module 21, and the calculation unit 121 calculates the distance between the primary device 1 and the

child devices

2 and 3 based on the initial signal strength and the strength of the received wireless signal. The second control module 22 includes a timing unit 221 for causing the wireless signals transmitted by the second network module 21 to be periodically transmitted.

In the calculation unit 121, the distance between the main device 1 and the

sub-devices

2 and 3 can be calculated by the following formula (1):

RSSI=A-10n·lg(d) (1)

Wherein: the RSSI is the strength of the wireless signal received by the first network module 11; n is a network signal propagation constant, which is a fixed value; A is the initial signal strength, according to the present invention In an embodiment, the initial signal strength may be an intensity of a wireless signal received by the first network module 11 when the distance between the master device and the child device is 1 m, which may be obtained by actual measurement; and d is a master device and a child The distance between the devices.

In order to obtain a more accurate relative distance value, the first control module 12 may further include an averaging unit 123 for performing an average calculation on the received strengths of the plurality of wireless signals to obtain an average strength of the wireless signals. The calculation unit 121 can calculate the distance between the main device 1 and the sub-devices 2 and 3 based on the initial signal strength and the average intensity of the wireless signal.

The wireless distance monitoring device according to an embodiment of the present invention may further have an alarm function on the basis of calculating the distance between the master device and the child device. According to an embodiment of the present invention, the first control module 12 may further include a determining unit 124, and a preset safety distance may be pre-stored in the storage unit 122. The main device 1 may further include a first alarm module 15, and the judging unit 124 may judge whether the distance between the main device 1 and the sub-devices 2 and 3 is greater than or equal to a preset safety distance. When the distance between the main device 1 and the

sub-device

2 or 3 is greater than or equal to a preset safety distance, the first alarm module 15 alarms. Alternatively or additionally, the

sub-devices

2 and 3 may include a second alarm module 25, and when the distance between the main device 1 and the

sub-device

2 or 3 is greater than or equal to a preset safety distance, the first network module 11 may An alarm signal is sent to the second network module 21 of the

slave device

2 or 3 to cause the second alarm module 25 to alert.

The alarm signal can be a PWM wave. The first alarm module 15 and the second alarm module 25 may be audible buzzers and/or LED lamps capable of color change/flicker.

According to an embodiment of the present invention, the first network module 11 and the second network module 21 may be infrared modules, and a ZigBee wireless network protocol may be employed between the first network module 11 and the second network module 21. ZigBee wireless network has high transmission efficiency, the maximum test distance is up to 400m, and it can freely fabricate communication network, low power consumption, low cost and capable of medium distance information communication and distance measurement.

The first network module 11 and the first control module 12 may be integrally provided, and the second network module 21 and the second control module 22 may be integrally provided. For example, with Texas Instruments' CC2530 chip as the core, the RF transceiver and 8051 CPU can be integrated, so that network functions can be realized to complete signal transmission and reception (maximum communication distance up to 400m), and control can be realized by CPU. The function of the calculation.

According to an embodiment of the present invention, the main device 1 can construct a network, search for and receive wireless signals transmitted by the

sub-devices

2 and 3, and calculate the main device 1 and the sub-devices 2 and 3 according to the ranging principle embodied by the formula (1). The distance between the two, and whether the distance has exceeded the preset safety distance and alarm and/or an alarm signal; the sub-device 2 can send a wireless signal to the main device 1 by joining the network formed by the main device 1, and according to the main device 1 The alarm signal is sent to alarm.

The principle of distance measurement between the master device and the child device is: in the case where the initial signal strength of the wireless signal transmitted by the child device is known, the master device calculates the master device and the child according to the strength of the wireless signal received from each of the child devices. The distance between the devices.

Taking the above-mentioned wireless distance monitoring device integrated with the 8051 CPU as an example, when the distance between the main device and the sub device needs to be alarmed due to exceeding the safety distance, the CPU generates a PWM wave to drive the buzzer to alarm; and/or drive A color LED light is used to alert the color change and/or flash.

Further, as a complete device, the main device 1 may further include a first power supply module 13 that supplies power and a first crystal module 14 that provides a clock signal. The first power module 13, the first crystal module 14, the first network module 11, and the first control module 12 may be integrally provided. The sub-device 2 may further include a second power module 23 that supplies power and a second crystal module 24 that provides a clock signal. The second power module 23, the second crystal module 24, the second network module 21, and the second control module 22 may be integrally provided.

Both the first power module 13 and the second power module 23 are powered by batteries. Since ZigBee has a low transmission rate and a transmit power of only milliwatts, sleep mode can also be used, so its power consumption is low. According to an embodiment of the present invention, a button battery may be employed as the first voltage module 13 and the second power module 23 to ensure a small volume, a light weight, and portability.

The wireless distance monitoring device according to an embodiment of the present invention has the characteristics of high integration, low power consumption, low cost, and low weight. The main device and the sub device may be implemented separately, or the main device and the sub device may be integrated in a wearable device, respectively. For example, the primary device and the secondary device may each be a portable device. Alternatively, the main device and the sub-devices may be integrated on the wearable device, respectively, and the wearable device may include a button, a brooch, a hairpin, a hat, and a collar, a bracelet, an ankle bracelet, a stud ear or a pair of glasses worn by the body.

The primary device can be carried or worn by a monitor (eg, a parent or a host), and the child device 2 can be carried or worn by a monitored person (eg, a child or a pet). The method of carrying or wearing is not limited, and can be selected according to the specific conditions of the monitor and the monitored person.

It should be understood that the present invention is not limited to the ZigBee wireless transmission mode, and other wireless communication methods are also achievable. The wireless distance monitoring device based on ZigBee wireless transmission mode can be applied in a small range of distance monitoring, and GPS technology can be utilized for a wider range of distance monitoring, but the cost is increased accordingly.

Each of the

sub-devices

2 and 3 may have a respective identification (ID), and the main device 1 may calculate the distance between the main device 1 and each of the sub-devices 2.

The workflows of the main device 1 and the sub device 2 are shown in FIG. 4 and FIG. 5, respectively.

4 is a schematic diagram showing the working flow of the main device 1 in FIG. 1, and FIG. 5 is a schematic diagram showing the working flow of the

sub-devices

2 and 3 in FIG.

As shown in FIG. 4, after the main device is started, a network is established, and a wireless signal transmitted by the sub-device is searched for and received within the communication range, and the distance between the main device and the sub-device is calculated according to the strength of the received wireless signal. In order to reduce the error, the master device can calculate the distance between the master device and the slave device by calculating the average of the strengths of the wireless signals received multiple times and according to the above formula (1). Comparing the calculated distance with a preset safety distance, when the safety distance is exceeded, the main device can make an alarm; and/or the main device sends an alarm signal to the sub-device exceeding the safety distance, so that the sub-device performs Call the police.

As shown in FIG. 5, after the child device is started, it automatically searches for and joins the network established by the master device. After joining the network established by the master device, the child device transmits a wireless signal to the master device. Additionally, the child device can alert in response to an alarm signal from the primary device.

It is to be understood that the above embodiments are merely exemplary embodiments employed to explain the principles of the invention, but the invention is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. These modifications and improvements are also considered to be within the scope of the invention.

Claims

A wireless distance monitoring device includes a primary device and a child device, the primary device being separately disposed from the child device and establishing an information transmission channel through a wireless network, wherein:

The master device is configured to assemble a network, search for and receive a wireless signal transmitted by the child device, and calculate a distance between the master device and the child device according to the strength of the received wireless signal;

The sub-device transmits a wireless signal to the primary device by joining a network formed by the primary device.
The wireless distance monitoring device according to claim 1, wherein said primary device comprises a first network module and a first control module, said child device comprising a second network module and a second control module, wherein:

The first network module is configured to set up a network, search for, and receive a wireless signal transmitted by the second network module;

The first control module includes a storage unit for storing an initial signal strength of the second network module, and the calculating unit is configured according to the initial signal strength and the strength of the received wireless signal a distance between the primary device and the child device;

The second control module includes a timing unit for causing a wireless signal transmitted by the second network module to be periodically transmitted.
The wireless distance monitoring device according to claim 2, wherein in the calculating unit, a distance between the main device and the sub-device is calculated using a formula RSSI=A-10n·lg(d), wherein :

The RSSI is the strength of the wireless signal received by the first network module;

n is a network signal propagation constant, which is a fixed value;

A is the initial signal strength; and

d is the distance between the primary device and the child device.
The wireless distance monitoring device according to claim 3, wherein the first control module further comprises an averaging unit configured to perform mean calculation on the received plurality of wireless signals to obtain an average strength of the wireless signal, and

The computing unit calculates a distance between the primary device and the child device based on the initial signal strength and an average strength of the wireless signal.
The wireless distance detecting apparatus according to claim 3, wherein said initial signal strength is an intensity of a wireless signal received by said first network module when a distance between said master device and said child device is 1 m.
The wireless distance monitoring device according to claim 3, wherein the first control module further comprises a determining unit, and a preset safety distance is pre-stored in the storage unit,

The main device further includes a first alarm module, and

The determining unit determines whether a distance between the main device and the sub-device is greater than or equal to the preset safety distance, when a distance between the main device and the sub-device is greater than or equal to the pre-predetermined When the safety distance is set, the first alarm module alarms.
The wireless distance monitoring device according to claim 3, wherein the first control module further comprises a determining unit, and a preset safety distance is pre-stored in the storage unit,

The sub-device further includes a second alarm module, and

The determining unit determines whether a distance between the main device and the sub-device is greater than or equal to the preset safety distance, when a distance between the main device and the sub-device is greater than or equal to the pre-predetermined When the safety distance is set, the first network module sends an alarm signal to the second network module, so that the second alarm module alarms.
The wireless distance monitoring device according to claim 6, wherein

The sub-device further includes a second alarm module, and

The determining unit determines whether the distance between the main device and the sub-device is large And at or equal to the preset safety distance, when the distance between the main device and the sub-device is greater than or equal to the preset safety distance, the first network module is to the second network module An alarm signal is sent to cause the second alarm module to alarm.
The wireless distance monitoring device according to claim 7 or 8, wherein the alarm signal is a PWM wave.
The wireless distance monitoring device according to claim 6, wherein the first alarm module is an audible buzzer and/or an LED lamp capable of color change/flicker.
The wireless distance monitoring device according to claim 7 or 8, wherein the second alarm module is an audible buzzer and/or an LED lamp capable of color change/flicker.
The wireless distance monitoring device according to claim 1, wherein said wireless distance monitoring device comprises a plurality of said sub-devices, each of said sub-devices having a respective identification, said main device calculating said main device and each The distance between one of the sub-devices.
The wireless distance monitoring device according to claim 2, wherein the first network module and the second network module are infrared modules, and ZigBee is adopted between the first network module and the second network module Wireless network protocol.
The wireless distance monitoring device according to claim 1, wherein the main device comprises a first power module that supplies power and a first crystal module that provides a clock signal, the first power module, the first crystal module, The first network module and the first control module are integrally disposed, and

The sub-device includes a second power module that provides a power source and a second crystal module that provides a clock signal, and the second power module, the second crystal module, the second network module, and the second control module are integrated Ground setting.
The wireless distance monitoring device according to claim 1, wherein said main device and said sub-device are respectively portable devices, or

The main device and the sub-device are respectively integrated on a wearable device, including a button, a brooch, a hairpin, a hat, a collar, a bracelet, an ankle bracelet, a stud ear or a pair of glasses.