CN103308886A - Local Tracking and Positioning System - Google Patents

Abstract

A local area tracking positioning system for tracking the position of a moving object comprises a transmitter attached to the moving object and used for transmitting electromagnetic waves, and a receiver for receiving the electromagnetic waves. Mainly utilizes the receiving point or transmitting module configured in the mode of potential difference to produce change of phase difference so as to calculate X coordinate and Y coordinate of said moving object. Therefore, the invention has the advantages of simple structure, simple calculation and low cost, and the moving range of the moving object is not limited to a plane any more, so that the economic benefit is effectively improved under the condition of practicability.

Description

Local Tracking and Positioning System

technical field

The invention relates to a positioning system, in particular to a local tracking and positioning system for a small area and tracking and positioning a moving object.

Background technique

The mouse is a tool that helps the user control the position of the cursor in the window interface. Referring to FIG. 1, taking a general optical mouse 1 as an example, it mainly includes a light-emitting element 11 that emits light relative to a work surface 1, and the time at predetermined intervals A micro-camera 12 that captures images of the working surface I, a calculation module 13 that calculates the moving distance of the mouse 1 according to the differences of the aforementioned images, and a communication module 14 that outputs the aforementioned moving distances. In this way, the X-Y coordinates of the mouse are determined to achieve the purpose of tracking and positioning.

However, since the aforementioned optical mouse 1 must capture images of the work surface I, the aforementioned mouse 1 can only move on or above the work surface I when moving, and has the disadvantage that the moving space is limited to the work surface I. It is inconvenient to use.

Referring to Fig. 2, another radio frequency identification (RFID) tracking and positioning system is taken as an example, which mainly includes several radio frequency readers (RFID Readers) 21 arranged at fixed points, and a radio frequency tag ( RFID Tag) 22, and a terminal device (not shown) that communicates with the aforementioned radio frequency reader 21.

When the moving object configured with the radio frequency tag 22 moves within the sensing range of the aforementioned radio frequency reader 21, the radio frequency tag 22 will actively transmit electromagnetic waves to the radio frequency reader 21, because the radio frequency tag 22 and the aforementioned radio frequency reader There are different distances between the devices 21, and the strength of the signal read by the RF reader 21 and returned to the terminal device is also different, so that the terminal device can use the received signal strength index (RSSI) of the aforementioned signal and a triangulation algorithm to calculate the current position and moving track of the radio frequency tag 22 (moving object).

However, the cost of an active RFID tag 22 is about US$10-US$50, and the cost of an RF reader 21 is as high as US$500-3000. Therefore, it not only requires an appropriate space to install multiple reading points, but also the cost is high. , but for smaller areas.

Contents of the invention

The object of the present invention is to provide a local area tracking and positioning system which is not limited in moving space, is suitable for local areas, and can reduce costs.

The local area tracking and positioning system of the present invention is used to track the position of a moving object, wherein the local area tracking and positioning system includes: a transmitter attached to the moving object and having a transmitting module for emitting electromagnetic waves; and a receiver , having at least three receiving points formed with a potential difference along an X-axis direction and a Y-axis direction and used for receiving electromagnetic waves, and a calculation module, the calculation module is based on at least one of the conditions of time difference, phase difference, and signal strength of receiving electromagnetic waves , calculate the X coordinate and Y coordinate of the moving object relative to the receiver.

In the local area tracking and positioning system of the present invention, the local area tracking and positioning system also includes an output device, and the receiver also has a communication module that communicates with the output device, so that the output device can , Y coordinate marks the position of the moving object.

In the local area tracking and positioning system of the present invention, the output device may be one of an electronic device, a display, and a printer.

In the local tracking and positioning system of the present invention, the aforementioned electromagnetic wave may be one of local radio waves, microwaves, and infrared rays.

In the local area tracking and positioning system of the present invention, the moving object may be one of a mouse, a human body, a remote controller, an amusement device, a sports device, and a glove.

In the local tracking and positioning system of the present invention, there are 4 receiving points, and a potential difference is formed along the X-axis direction, the Y-axis direction, and the Z-axis direction. The calculation module is based on the time difference and phase difference of receiving electromagnetic waves , and at least one of the conditions of signal strength, and calculate the Z coordinate of the moving object relative to the receiver.

The local area tracking and positioning system of the present invention is used to track the position of a moving object, wherein the local area tracking and positioning system includes: a transmitter attached to the moving object and having a shape formed along an X-axis direction and a Y-axis direction There are at least two transmitting modules with a potential difference and respectively used for transmitting electromagnetic waves; and a receiver, which has a receiving point for receiving the electromagnetic waves, and a calculation module, which calculates according to the time difference, phase difference, and signal of receiving the electromagnetic waves At least one of the conditions of strength is used to calculate the X-coordinate and Y-coordinate of the moving object relative to the receiver.

In the local tracking and positioning system of the present invention, there are 4 transmitting modules, and a potential difference is formed along the X-axis direction, the Y-axis direction, and the Z-axis direction. The calculation module is based on the time difference and phase difference of receiving electromagnetic waves , and at least one of the conditions of signal strength, and calculate the Z coordinate of the moving object relative to the receiver.

The beneficial effects of the present invention are: the use of receiving points or transmitting modules arranged in the form of a potential difference produces a change in the phase difference, and then calculates the X, Y coordinates of the moving object, which not only has simple structure, simple calculation, and low cost, but also The moving range of the moving object is no longer limited to the plane, so that the present invention can effectively improve economic benefits under the condition of both practicability.

Description of drawings

Fig. 1 is, the sectional view of general optical mouse;

2 is a schematic diagram of a general RFID tracking and positioning system;

Fig. 3 is a perspective view illustrating a local tracking and positioning system according to a first preferred embodiment of the present invention;

Fig. 4 is a structural schematic block diagram of the first preferred embodiment;

Fig. 5 is a schematic diagram of the receiving sequence in the first preferred embodiment;

Fig. 6 is the waveform diagram of phase difference generated by the first preferred embodiment;

Fig. 7 is a schematic diagram of calculating the X coordinate and Y coordinate of a moving object in the first preferred embodiment;

Fig. 8 is a schematic diagram of calculating the X coordinate, Y coordinate and Z coordinate of the moving object in the first preferred embodiment;

Fig. 9 is a perspective view of a local tracking and positioning system according to a second preferred embodiment of the present invention;

FIG. 10 is a perspective view illustrating a local area tracking and positioning system according to a third preferred embodiment of the present invention; and

Fig. 11 is a schematic block diagram of the structure of the third preferred embodiment.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. First of all, it should be noted that the present invention is not limited to the following specific embodiments. Those skilled in the art should understand the present invention from the spirit embodied in the following embodiments, and each technical term can be optimized based on the spirit of the present invention. broad understanding. The same or similar components in the figures are denoted by the same reference numerals.

Referring to Fig. 3 and Fig. 4, the local tracking and positioning system of a first preferred embodiment of the present invention is used to track the position of a moving object 3, which can be a mouse, a human body, a remote controller, an amusement device, and a sports apparatus , gloves, etc. In this preferred embodiment, the moving object 3 is a mouse. The local area tracking and positioning system includes a transmitter 4 , a receiver 5 , and an output device 6 .

The transmitter 4 is attached to the mobile object 3 and has a transmitting module 41 for emitting electromagnetic waves. The aforementioned electromagnetic waves may be one of local radio waves, microwaves, and infrared rays. In this preferred embodiment, the aforementioned electromagnetic wave is WI-FI with a frequency of about 3 GHz and a wavelength of about 10 cm.

The receiver 5 has three receiving points 51 , 52 , 53 for receiving electromagnetic waves, a calculation module 54 , and a communication module 55 , which are formed with a level difference along an X-axis direction and a Y-axis direction. The calculation module 54 calculates the X coordinate and the Y coordinate of the moving object 3 relative to the receiver 5 according to the time difference and the phase difference of receiving the electromagnetic wave. The communication module 55 is used for outputting the aforementioned X coordinate and Y coordinate.

The output device 6 and the communication module 55 of the receiver 5 communicate with each other, and mark the position of the moving object 3 according to the aforementioned X coordinate and Y coordinate. In this preferred embodiment, the output device 6 is electrically connected to the communication module 55 of the receiver 5, and may be one of electronic devices such as a computer, a monitor, and a printer.

Referring to Fig. 5 and Fig. 6, since the aforementioned receiving points 51, 52, 53 form a potential difference (the potential difference is a known condition), therefore, when the transmitting module 41 on the moving object 3 emits electromagnetic waves, the aforementioned receiving points 51 , 52, and 53 will receive electromagnetic waves at different time points according to the sequence of receiving and receiving.

According to the foregoing, the aforementioned electromagnetic wave is a sine wave with a constant frequency and amplitude, so, for the aforementioned receiving points 51, 52, 53, the received sine waves will have phase differences, time differences, and signal strengths are also different. Therefore, Regardless of the phase difference, or time difference, or signal strength, the aforementioned electromagnetic waves will have a phase angle Δθ ₁ , Δθ ₂ , Δθ 3 between the receiving points 51 and 52, between the receiving points 52 and 53, and between the receiving points 51 and ₅₃ , refer to Fig. 4, Fig. 5, and Fig. 6, Fig. 7, whereby, in the case of knowing the position difference of the aforementioned receiving points 51, 52, 53 along the X-axis direction and the Y-axis direction, the calculation module 54 can use Trigonometric functions, and according to the aforementioned phase angles Δθ ₁ , Δθ ₂ , Δθ ₃ , and the distances R ₁ , R ₂ , and R 3 between the moving object 3 and the aforementioned receiving points 51, 52, and ₅₃ , calculate the X seat of the moving object 3 Scale and Y coordinate.

Then, the communication module 55 will output the X coordinate and Y coordinate of the moving object 3, so that the output device 6 can mark the position of the moving object 3 according to the aforementioned X coordinate and Y coordinate, or display the position of the moving object 3. moving track.

Referring to Fig. 4 and Fig. 8, it is worth mentioning that the present invention can also have two other receiving points 501, 502 formed with a potential difference along a Z-axis direction and used for receiving electromagnetic waves. Points along the X-axis direction, the Y-axis direction and the Z-axis direction under the situation of the position difference, the calculation module 54 can also use trigonometric functions, and according to the phase angles of the aforementioned adjacent receiving points 51, 52, 53, 501, 502, the After the distance between the moving object 3 and the aforementioned receiving points 51, 52, 53, 501, 502 is calculated, the X coordinate, Y coordinate, and Z coordinate of the moving object 3 are calculated, and the output device 6 according to the aforementioned X coordinate , Y coordinate, and Z coordinate mark the position of the moving object 3, or display the moving track of the moving object 3.

Referring to Fig. 9, it is a second preferred embodiment of the present invention, which is substantially the same as the first preferred embodiment, except that:

In this preferred embodiment, the mobile object 3 is a ring placed on a human finger.

The output device 6 is a display in this preferred embodiment, and is electrically connected with the receiver 5 .

In this way, the receiving points 51 , 52 , and 53 arranged in the manner of a phase difference also produce changes in the phase difference, and then the X coordinate and the Y coordinate of the moving object 3 are calculated.

Referring to Fig. 10 and Fig. 11, it is a third preferred embodiment of the present invention, which is roughly the same as the first preferred embodiment, and also includes a transmitter 4 attached to a moving object 3, and an output device 6 a receiver 5 for communication. The difference is:

The moving object 3 is a human hand in this preferred embodiment.

The emitter 4 has three emitting modules 42 , 43 , 44 formed with a level difference along an X-axis direction and a Y-axis direction and respectively used for emitting electromagnetic waves.

The receiver 5 has a receiving point 56 and also includes a calculation module 54 and a communication module 55 .

In this way, since there is a potential difference between the transmitting modules 42, 43, and 44, when the transmitting modules 42, 43, and 44 on the moving object 3 emit electromagnetic waves, the receiving point 56 will also receive them according to the receiving sequence. , so that the received sine wave produces a phase difference, and there is a phase angle between the aforementioned transmitting modules 42 , 43 , 44 , and then the X coordinate and Y coordinate of the moving object 3 are calculated.

It is worth mentioning that the present invention can also have two other transmitting modules (not shown) that form a potential difference along a Z-axis direction and are used to receive electromagnetic waves. direction and the Z-axis direction under the situation, the calculation module 54 can also use trigonometric functions, and according to the phase angle between the aforementioned adjacent transmitting modules, the distance between the moving object 3 and the aforementioned transmitting module, calculate the moving object 3 The X coordinate, Y coordinate, and Z coordinate of .

According to the above, it can be seen that the local area tracking and positioning system of the present invention has the following advantages and effects:

1. The present invention uses receiving points or transmitting modules configured in a potential difference manner to generate phase differences, or time differences, or changes in signal strength, and then calculate the X coordinates, Y coordinates, and Z coordinates of the moving object 3 Not only the structure is simple and the calculation is simple, but also the range of movement of the mobile object 3 is no longer limited to the plane, which can improve the convenience and practicality of use.

2. According to the aforementioned special tracking method, the present invention can use low-cost, small-sized transmitter 4 and receiver 5, and is applicable to a small area, making the present invention more competitive in products.

It should be understood that after reading the above teaching content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims (12)

1. A local tracking and positioning system for tracking the position of a moving object, characterized in that the local tracking and positioning system comprises: a transmitter attached to the mobile and having a transmitting module for emitting electromagnetic waves; and A receiver, having at least three receiving points formed with a potential difference along an X-axis direction and a Y-axis direction for receiving electromagnetic waves, and a calculation module, the calculation module is based on the time difference, phase difference, and signal strength of receiving electromagnetic waves at least One of the conditions is to calculate the X coordinate and Y coordinate of the moving object relative to the receiver. 2. The local area tracking and positioning system according to claim 1, characterized in that, the local area tracking and positioning system also includes an output device, and the receiver also has a communication module that communicates with the output device, so that the The output device marks the position of the moving object according to the aforementioned X and Y coordinates. 3. The local area tracking and positioning system according to claim 2, wherein the output device is one of an electronic device, a display, and a printer. 4. The local tracking and positioning system according to claim 1, wherein the electromagnetic wave is one of local radio waves, microwaves, and infrared rays. 5. The local area tracking and positioning system according to claim 1 or 2, wherein the moving object is one of a mouse, a human body, a remote controller, an amusement device, a sports device, and a glove. 6. The local area tracking and positioning system according to claim 1, wherein there are 4 receiving points, and a potential difference is formed along the X-axis direction, the Y-axis direction, and the Z-axis direction, and the calculation module Calculate the Z coordinate of the moving object relative to the receiver according to at least one condition of time difference, phase difference, and signal strength of receiving electromagnetic waves. 7. A local tracking and positioning system for tracking the position of a moving object, characterized in that the local tracking and positioning system comprises: A transmitter, attached to the moving object, has at least two transmitting modules that have a potential difference along an X-axis direction and a Y-axis direction and are respectively used to emit electromagnetic waves; and A receiver, having a receiving point for receiving the electromagnetic wave, and a calculation module, the calculation module calculates the relative distance of the moving object relative to the receiver according to at least one condition of receiving the electromagnetic wave, phase difference, and signal strength X coordinate and Y coordinate. 8. The local area tracking and positioning system according to claim 7, characterized in that, the local area tracking and positioning system also includes an output device, and the receiver also has a communication module that communicates with the output device, so that the The output device marks the position of the moving object according to the X coordinate and the Y coordinate. 9. The local area tracking and positioning system according to claim 8, wherein the output device is one of an electronic device, a display, and a printer. 10. The local tracking and positioning system according to claim 7, wherein the electromagnetic wave is one of local radio waves, microwaves, and infrared rays. 11. The local area tracking and positioning system according to claim 7 or 8, wherein the moving object is one of a mouse, a human body, a remote controller, an amusement device, a sports device, and a glove. 12. The local tracking and positioning system according to claim 7, wherein there are 4 transmitting modules, and a potential difference is formed along the X-axis direction, the Y-axis direction, and the Z-axis direction, and the calculation module Calculate the Z coordinate of the moving object relative to the receiver according to at least one condition of time difference, phase difference, and signal strength of receiving electromagnetic waves.

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