CN100458465C - Target tracking device and target tracking system and method using same - Google Patents

Abstract

A target tracking device and a target tracking system and method using the same are provided, the target tracking system includes: at least one wireless access device, a target tracking device and a server device; wherein the target tracking device comprises: the device comprises a signal transmission unit, a signal conversion unit, a signal transmission control unit, a processing unit, a storage unit and a display unit; the invention solves the problem that dead angles exist in the transmission and the reception of positioning signals in the existing target tracking technology, thereby realizing the omnibearing tracking monitoring; due to the adoption of the wireless local area network technology, the invention has the characteristics of large information transmission quantity and rapidness, and realizes the purposes of low cost, convenient use and rapid information transmission.

Description

Target tracking device, target tracking system and method using the device

technical field

The present invention relates to a target tracking system and method, in particular to a target tracking device applied in a wireless local area network and the target tracking system and method using the device.

Background technique

Today, tracking and monitoring technologies are being used more and more in various industries. For example, track and monitor special targets (important people, valuable equipment) in public places; track and monitor children in schools; track and monitor the elderly or sick in social welfare units; track and monitor specific targets in military areas, etc. .

A technology to realize target tracking and monitoring is video monitoring, such as using video cameras, cameras, etc. for target monitoring. In practical applications, the existing monitoring system needs to be equipped with related equipment such as large screens and video walls. The existing video monitoring equipment is expensive, difficult to transmit image data, easily damaged and unable to monitor in all directions.

Another technology of target monitoring is sound monitoring equipment, such as the use of bugs to achieve the purpose of monitoring. The current existing sound monitoring methods have problems such as short monitoring distance (that is, can only be used in a small area), no image information, and invasion of privacy.

In addition, the currently widely used satellite monitoring technology is a technology that uses the Global Positioning System (GPS) to monitor the satellite positioning of ground targets carrying GPS receivers. Information System, referred to as GIS) combined use. However, the cost of this satellite monitoring technology is extremely high, and the GPS positioning signal has a dead angle for transmission and reception, so it cannot locate indoor, tunnel or underground targets.

Since most of the existing target tracking systems are set for targets in a specific area, the above-mentioned disadvantages will appear. With the popularity of wireless LAN, the application content in the wireless LAN environment is becoming more and more abundant. Therefore, how to use The basically perfect and mature wireless local area network technology provides a low-cost, easy-to-use, and fast information transmission target tracking system, and can overcome the dead angle phenomenon of positioning signal transmission and reception in existing target tracking technology, which has become an important research topic for people in this field. question.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the main purpose of the present invention is to provide a target tracking device, a target tracking system and a method using the device that can overcome the dead angle phenomenon of transmission and reception of positioning signals in the existing target tracking technology.

Another object of the present invention is to provide a low-cost object tracking device and an object tracking system and method using the device.

Another object of the present invention is to provide an object tracking device that facilitates tracking, and an object tracking system and method using the device.

Another object of the present invention is to provide an object tracking device that is easy to use, and an object tracking system and method using the same.

Still another object of the present invention is to provide a large and rapid target tracking device, a target tracking system and method using the device.

In order to achieve the above and other objectives, the target tracking device of the present invention includes: a signal transmission unit for receiving positioning signals and returning positioning information; a signal conversion unit for decoding the received positioning signals, and The positioning information returned is encoded; the signal transmission control unit is used to perform data access, frame definition and error control including at least the positioning signal and positioning information; the processing unit is used to perform calculation processing on the received positioning signal, In order to obtain real-time positioning information for sending back; the storage unit is used to store the positioning information; and the display unit is at least used to display the positioning information.

In addition, the present invention also provides an object tracking system using the above-mentioned object tracking device. The system includes: at least one wireless access device, used to transmit positioning signals in the wireless local area network and receive the positioning signals returned by the object tracking device. Positioning information; the target tracking device is used to receive the positioning signal transmitted by the wireless access device, and calculate the positioning information and send it back to the wireless access device; and the server device is used to control the wireless access device The device transmits a positioning signal, and processes the positioning information after receiving the positioning information returned by the wireless access device.

The object tracking method using the above object tracking device of the present invention is applied in a wireless local area network structure, and the object tracking device is at least composed of a signal transmission unit, a signal conversion unit, a signal transmission control unit and a processing unit, the target tracking method includes Provide at least one wireless access device to transmit positioning signals in the wireless local area network and receive positioning information returned by the signal transmission unit; provide the signal transmission unit to receive the positioning signals transmitted by the wireless access device and the feedback Transmit positioning information; provide the signal conversion unit to decode the received positioning signal and encode the returned positioning information; provide the signal transmission control unit to perform data access including at least the positioning signal and positioning information , frame definition and error control; provide the processing unit to perform arithmetic processing on the received positioning signal, so as to obtain real-time positioning information for sending back to the wireless access device; and provide a server device to control the transmission of the wireless access device positioning signal, and after receiving the positioning information sent back by the wireless access device, processing the positioning information.

Compared with the existing target tracking technology, the target tracking device of the present invention and the target tracking system and method using the device solve the problem of dead angles in the transmission and reception of positioning signals in the existing target tracking technology. Due to the use of wireless local area network technology, the present invention It has the characteristics of large and rapid information transmission, and realizes the purposes of low cost, convenient use and fast information transmission.

Description of drawings

Fig. 1 is the structural representation of target tracking system of the present invention;

Fig. 2 is a block diagram of the basic structure of the target tracking device of the present invention;

Fig. 3 is a flow chart of implementing the target tracking method of the present invention; and

FIG. 4 is a flow chart of the target tracking device in FIG. 3 transmitting positioning information through these wireless access devices to implement tracking and monitoring of the tracked target.

Detailed ways

Example

The implementation of the present invention will be described below through specific specific examples.

Please refer to Fig. 1, it is the structure of the target tracking system of the present invention. In this embodiment, the target tracking system of the present invention includes a server device 1 , at least one wireless access device 2 and a target tracking device 3 .

The server device 1 is used to control the wireless access device 2 to transmit a positioning signal, and to process the positioning information after receiving the positioning information transmitted by the wireless access device 2 and received from the target tracking device 3 . In this embodiment, the server device 1 is a geographic information system server, which locates and tracks the tracking target through the area network map stored in it, and the monitoring and management personnel can determine whether to carry the target tracking device 3 through the wireless local area network 4 functions such as the current location of the user, querying the target tracking of the user, analyzing the tracking history, and tracking the trajectory of the user's actions.

The wireless access devices 2 are used for transmitting positioning signals in the wireless local area network 4 and receiving positioning information transmitted by the object tracking device 3 . As shown in the figure, these wireless access devices 2 are wireless network access points (Access Point; AP) in the wireless local area network 4 structure.

The target tracking device 3 is used to receive the positioning signal transmitted by the wireless access device 2 , and calculate the positioning information of the target tracking device 3 and send it back to the wireless access device 2 . In this embodiment, the target tracking device 3 is a portable mobile device, such as a paging device, a pager and other small devices, which only need to be set on the target to be tracked.

Next, please refer to FIG. 2 , which is a block diagram of the basic structure of the object tracking device 3 of the present invention. The target tracking device 3 includes: a signal transmission unit 30 , a signal conversion unit 31 , a signal transmission control unit 32 , a processing unit 33 , a storage unit 34 , a display unit 35 , an input unit 36 and a power supply unit 37 . The target tracking device 3 supports various wireless local area network standards.

The signal transmission unit 30 is used for receiving a positioning signal in radio frequency signal format from the wireless local area network 4, and returning corresponding positioning information. In this embodiment, the signal transmission unit 30 can receive the radio frequency signal in the wireless local area network 4 through the receiving antenna, and amplify the signal.

The signal conversion unit 31 is used for decoding the positioning signal received by the signal transmission unit 30 and pre-coding the transmitted positioning information. Wherein, the signal conversion unit 31 of the present invention uses the zero-IF signal conversion technology to complete the conversion of the radio frequency signal of the wireless local area network 4, and this technology reduces the cost of the target tracking device 3 while improving integration.

The signal transmission control unit 32 is used for controlling at least data access including positioning signals, frame definition and error control to the network through the signal transmission unit 30 and the signal conversion unit 31 .

The processing unit 33 is used for calculating and processing the positioning signal accessed by the signal transmission control unit 32 , so as to obtain the positioning information of the target tracking device 3 . In this embodiment, the processing unit 33 is internally integrated with various necessary functions such as memory, bus control, timer/counter, I/O control, AD/DA conversion, and is responsible for signal data processing, analog-to-digital conversion, liquid crystal display, Power management and button function control, etc.

The storage unit 34 is used for storing the positioning information calculated by the processing unit 33 . In this embodiment, the storage unit 34 is a flash memory. The storage unit 34 can also be one of a micro hard disk, a static random access memory (SRAM) or a combination thereof with a flash memory.

The display unit 35 is used for displaying the positioning information calculated by the processing unit 33 . Wherein, the display unit 35 of the present invention further includes a light emitting diode module 35a for displaying the connection status of the object tracking device 3 , and a liquid crystal display module 35b for displaying the location information calculated by the object tracking device 3 . In this embodiment, the LED module 35a displays the connection status between the target tracking device 3 and the WLAN 4, which can be, for example: when the LED module 35a is in the connected state, the light emitting diode module 35a is illuminated; The LED module 35a is turned off. The liquid crystal display module 35b can display a small amount of graphic information, such as the location, the distance from the destination, time, etc., so that the tracked target can understand the intention of the tracker through real-time information prompts, so the liquid crystal display module 35b can be used according to Different fields of application are expanded or omitted.

The input unit 36 is used for the tracking manager to input instructions to control the target tracking device 3 and define attributes of the tracked target before starting to use. Wherein, the input unit 36 is an expandable module, and the user can decide whether it is needed or not according to the application characteristics. When mandatory tracking of targets is required, such as tracking children, the elderly, patients, and moving objects in military restricted areas, it is not necessary to design this input function; in areas such as companies and government agencies, in order to protect the privacy of the tracked target, you can Design the input function for the tracked person to set to disable or activate the tracking function according to their needs. In this embodiment, if the tracking permission button is designed, the mobile target can also decide whether to disclose its location. After the above settings are completed, these setting contents are all stored in the storage unit 34 .

The power unit 37 is used to provide working power for the target tracking device 3 . In this embodiment, in order to improve the portability of the target tracking device 3 , a button battery or a solar panel or other small power supply equipment can be used.

Please refer to FIG. 3 , which is the process steps of implementing the target tracking method of the present invention. as the picture shows:

In step S1, the tracking manager inputs instructions to control the target tracking device 3 and sets attributes of the target to be tracked before starting to use. In order to more specifically illustrate the target tracking method of the present invention, in this embodiment, it is assumed that the target tracking device 3 is used in the tracking and supervision of children. When performing this step, the tracked target is set to be unconditionally tracked at any time. When the tracked target cannot turn off the target tracking system. Next, proceed to step S2.

In step S2, the above-mentioned setting results are stored in the storage unit 34 of the target tracking device 3 as a basis for tracking in subsequent steps. Next, proceed to step S3.

In step S3, the target tracking system is turned on by the tracking manager to start running, that is, to connect to the wireless local area network 4 . Next, proceed to step S4.

In step S4 , the wireless access devices 2 arranged in the wireless local area network 4 transmit positioning signals and receive the positioning information returned by the target tracking device 3 . Next, proceed to step S5.

In step S5, use the positioning information sent back from the target tracking device 3 received by the server device 1 through the wireless access device 2, and determine the location information of the tracking target after comparing with the local area network map stored in it . Next, proceed to step S6.

In step S6, the location information of the tracked object is processed in the server device 1 to achieve the purpose of location tracking, and the location of the tracked object can be grasped by the object tracking manager.

Please refer to FIG. 4 , which shows in more detail in step S4 of FIG. 3 , the target tracking device 3 transmits positioning information through the wireless access devices 2 to realize the process steps of tracking and monitoring the tracked target.

In step S40 , the signal transmission unit 30 of the object tracking device 3 is used to receive the positioning signal sent by the access point of the wireless local area network 4 . Next, proceed to step S41.

In step S41, the signal conversion unit 31 decodes the positioning signal. Next, proceed to step S42.

In step S42, the signal transmission control unit 32 performs operations including information access of positioning signals, frame definition and error control. Next, proceed to step S43.

In step S43 , the processing unit 33 performs calculation processing on the positioning signal accessed by the signal transmission control unit 32 to obtain the positioning information of the object tracking device 3 . Next, proceed to step S44.

In step S44 , the storage unit 34 is used to store the positioning information calculated by the processing unit 33 , and the positioning information is returned through the signal transmission unit 30 . Finally, proceed to step S45.

In step S45, the display unit 35 can also be used to display real-time positioning information.

Compared with the existing target tracking technology, the target tracking device of the present invention and the target tracking system and method using the device use the existing wireless local area network with low cost, few dead spots, large amount of information transmission and fast transmission speed, and light and thin volume. The portable target tracking device can not only achieve the goals of low cost, convenient use, and fast information transmission, but also overcome the phenomenon of dead angles in the transmission and reception of positioning signals in existing target tracking technologies.

Claims (23)

1. A target tracking device, applied in a wireless local area network structure, is characterized in that, the target tracking device comprises: The signal transmission unit is used for receiving positioning signals and returning positioning information; A signal conversion unit, configured to decode the received positioning signal and encode the returned positioning information; The signal transmission control unit is used for performing data access, frame definition and error control including at least positioning signal and positioning information; The processing unit is used for computing and processing the received positioning signal, so as to obtain real-time positioning information for return; a storage unit for storing positioning information; and The display unit is at least used to display the positioning information. 2. The device according to claim 1, further comprising an input unit for inputting control instructions. 3. The device according to claim 1, further comprising a power supply unit for providing working power. 4. The device according to claim 1, wherein the display unit comprises: a light emitting diode module for displaying connection status and a display module for displaying the location information. 5. The device of claim 4, wherein the display module is a liquid crystal display. 6 . The device according to claim 1 , wherein the signal conversion unit converts the wireless local area network signal by applying zero-IF signal conversion technology. 7 . 7. A target tracking system with a target tracking device as claimed in claim 1, applied in a wireless local area network structure, characterized in that, the target tracking system comprises: At least one wireless access device, used to transmit positioning signals in the wireless local area network and receive positioning information returned by the target tracking device; a target tracking device, configured to receive the positioning signal transmitted by the wireless access device, and calculate and return the positioning information to the wireless access device; and The server device is used to control the wireless access device to transmit a positioning signal, and to process the positioning information after receiving the positioning information sent back by the wireless access device. 8. The system of claim 7, wherein the wireless access device is a wireless network access point disposed in the wireless local area network structure. 9 . The system according to claim 7 , wherein the server device is a geographic information system server, and uses a local area network map to locate the tracking target and process the tracking information. 10. The system according to claim 7, wherein the target tracking device further comprises an input unit for inputting control commands. 11. The system according to claim 7, wherein the object tracking device further comprises a power supply unit for providing working power. 12. The system according to claim 7, wherein the target tracking device further comprises a display unit, and the display unit is composed of a light emitting diode module for displaying connection status and a display module for displaying the positioning information constitute. 13. The system of claim 12, wherein the display module is a liquid crystal display. 14. The system according to claim 7, wherein the target tracking device further comprises a signal conversion unit, and the signal conversion unit uses a zero-IF signal conversion technology to complete the conversion of the WLAN signal. 15. A target tracking method using a target tracking device, which is applied in a wireless local area network structure, and the target tracking device is at least composed of a signal transmission unit, a signal conversion unit, a signal transmission control unit, and a processing unit, the target tracking method includes : providing at least one wireless access device to transmit positioning signals in the wireless local area network and receive positioning information returned by the signal transmission unit; The signal transmission unit is provided to receive the positioning signal transmitted by the wireless access device and return the positioning information; The signal conversion unit is provided to decode the received positioning signal and encode the returned positioning information; providing the signaling control unit for data access, frame definition and error control including at least positioning signals and positioning information; The processing unit is provided to perform arithmetic processing on the received positioning signal, so as to obtain real-time positioning information for sending back to the wireless access device; and The server device is provided to control the wireless access device to transmit the positioning signal, and to process the positioning information after receiving the positioning information sent back by the wireless access device. 16. The method of claim 15, wherein the wireless access device is a wireless network access point disposed in the wireless local area network structure. 17. The method according to claim 15, wherein the method for processing the positioning information by the object tracking device further comprises: providing a storage unit to store the positioning information; and A display unit is provided to display at least the positioning information. 18. The method according to claim 15, wherein the server device is a geographic information system server, and uses a local area network map to locate the tracking target and process the tracking information. 19. The method according to claim 17, wherein the method for processing positioning information by the object tracking device further comprises providing an input unit for inputting control commands. 20. The method according to claim 17, wherein the method for processing positioning information by the object tracking device further comprises a power supply unit for providing working power. 21. The method according to claim 17, wherein the display method of the display unit comprises: providing a light emitting diode module to display the connection status of the object tracking device; and A display module is provided to display the positioning information. 22. The method of claim 21, wherein the display module is a liquid crystal display. 23. The method according to claim 17, wherein the signal conversion unit uses a zero-IF signal conversion technology to complete the conversion of the WLAN signal.

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