CN117630817A - Positioning system for passive optical detection target position - Google Patents
Positioning system for passive optical detection target position Download PDFInfo
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- CN117630817A CN117630817A CN202311543918.6A CN202311543918A CN117630817A CN 117630817 A CN117630817 A CN 117630817A CN 202311543918 A CN202311543918 A CN 202311543918A CN 117630817 A CN117630817 A CN 117630817A
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Abstract
The application discloses a positioning system of passive optical detection target position includes: a plurality of visible light receiving and transmitting nodes which are arranged at all set positions in the field and are used for transmitting narrow light beams endowed with unique ID information to all set illumination areas in the field for illumination, receiving visible light reflected by a target and adjusting related data information of the visible light; and the central information processing unit is in signal connection with each visible light receiving and transmitting node and is used for carrying out positioning calculation according to the visible light reflected by the target and the ID information of the visible light regulated out so as to obtain the positioning target position. The passive positioning target is realized by utilizing the visible light communication and the reflection characteristic of the target surface, the self characteristics of the passive positioning target can provide a beneficial supplement for the existing indoor positioning system, and the passive positioning target plays a more positive role in occasions with more limitations, such as hospitals and airport internal partial areas which prohibit the use of mobile phones.
Description
Technical Field
The present disclosure relates to positioning technology, and in particular, to a positioning system for passive optical detection of a target position.
Background
In the last decade, many researchers have conducted leading edge research around a new emerging hotspot technology, visible light communication VLC (Visible Light Communication). The new technology is developed by the mature and rapid development of LED (Lighting Emitting Diode) technology, and meanwhile, the LED rapidly expands the occupancy of the LED in the lighting market due to high reliability, long service life, small heating loss and high luminous efficiency, and the front research has wide market prospect. The LED light source can be rapidly turned on and off, and the switching frequency exceeding 300Hz can not be observed to change by human eyes, so that data can be sent through the change of the switching state of the LED, the change of light can be detected by a Photo-Diode or other photosensitive elements, and the receiving end demodulates the data, so that visible light communication is formed.
Besides the research direction of continuously improving the communication rate so as to transmit more data in a shorter time, the low-rate visible light communication mode realized by simply utilizing the common LED and the low-cost singlechip can also provide a novel solution for some prior art problems in our living field and industry field. The disclosed visible light communication positioning system requires that the positioning target is an intelligent device, such as a mobile phone or a specially designed intelligent terminal, and the target must have the capability of receiving and detecting information contained in visible light to detect the position, so that the positioning target can be classified as active positioning, and has high cost, complex system and difficult popularization.
Disclosure of Invention
The application provides a positioning system for passive optical detection of a target position, which aims to solve the technical problems of high cost, complex system and difficult popularization of the existing visible light communication positioning system.
The technical scheme adopted by the application is as follows:
a positioning system for passive optical detection of a target location, comprising:
a plurality of visible light receiving and transmitting nodes which are arranged at all set positions in the field and are used for transmitting narrow light beams endowed with unique ID information to all set illumination areas in the field for illumination, receiving visible light reflected by a target and adjusting related data information of the visible light;
and the central information processing unit is in signal connection with each visible light receiving and transmitting node and is used for carrying out positioning calculation according to the visible light reflected by the target and the ID information of the visible light regulated out so as to obtain the positioning target position.
Further, the visible light receiving and transmitting node includes:
the singlechip outputs control pulses for controlling the on and off of the LEDs, performs ADC sampling on output signals of the visible light detection circuit, demodulates ID information contained in the visible light from the output signals, and determines which narrow beam the visible light comes from;
the LEDs are connected with the GPIO interface circuit of the singlechip through the LED driving circuit and are used for providing a plurality of narrow light beams with corresponding irradiation distances according to control pulses output by the singlechip to jointly form an illumination area of a node;
the visible light detection circuit is connected with the ADC sampling interface circuit of the singlechip through the receiving circuit and is used for receiving visible light reflected by a target;
and the serial port receiving and transmitting circuit is used for realizing the communication between the singlechip of each node and the central information processing unit, so that each node can be controlled by the central processing unit and send the related data information of the visible light obtained in the visible light communication to the central processing unit, thereby completing the positioning function.
Further, when the singlechip outputs control pulses for controlling the on/off of the LEDs, the DPPM is selected to regulate visible light, each pulse has the same amplitude and width, the interval between the falling edge of the previous pulse and the next rising edge is used for representing 1 or 0, the short interval is 1, the long interval is 0, when the ID information of each narrow beam is designed, the quantity ratio of 0 to 1 is ensured to be unchanged, and the average value of the lengths is equal to the pulse interval length when the LEDs do not perform visible light communication; assuming that the amplitude and the width of the pulse are unchanged when the LED does not perform visible light communication, changing the brightness by adjusting the duty ratio, namely the pulse interval, wherein the interval is t1; the short interval representing 1 is t2, the long interval representing 0 is t3, and the number of 1 is x in n numbers, then the following formula is satisfied:
t2<t1<t3；
further, the visible light detection circuit comprises a photosensitive sensor, and the photosensitive sensor is connected with the ADC sampling interface circuit of the singlechip through a receiving circuit.
Further, the photosensitive sensor adopts a photodiode, and the receiving circuit adopts a photodiode receiving circuit.
Further, the serial port transceiver circuit adopts a wireless serial port transceiver module or a wired serial port transceiver module.
Further, the wireless serial port transceiver module comprises WIFI, bluetooth and ZigBee.
Further, the wired serial port transceiver module comprises an RS422 and R485 bus network.
Further, the central information processing unit adopts a computer with a graphical user interface GUI, and the computer performs positioning calculation according to the visible light reflected by the target and the ID information of the visible light regulated, so as to obtain the position of the positioning target and display the position on the graphical user interface GUI.
Further, the device also comprises a reflective tag placed on the target object and used for reflecting the visible light from the visible light receiving and transmitting node.
Compared with the prior art, the application has the following beneficial effects:
the application designs a passive optical target position detection system, which enables a visible light beam to carry unique ID information by applying a visible light communication technology, so that the visible light beam can be identified by a receiving end, a reliable visible light communication link is enabled and established by reflecting a target with a high-reflectivity smooth surface, and data obtained by communication can be used for further positioning the target. The application gives attention to the original lighting function of the indoor lighting system, and realizes the transformation of the original LED lighting source by adding low-cost hardware, so that the indoor lighting system has two functions of lighting and communication. The prototype machine developed based on the application is proved to be feasible through experiments, the characteristics of visible light and the special requirements of a positioning system on targets can help the application to find application environments in certain limited scenes, such as positioning automobiles in indoor parking lots or positioning metal parts in warehouses, and the like, and can play a more positive role in places with more limitations, such as places inconvenient to use mobile phones for positioning, such as hospitals and airport internal partial areas where mobile phones are forbidden, so that the application range is greatly improved, the cost is low, the system is simple, the popularization is easy, and the application prospect of the market is wide.
The present application provides other objects, features and advantages in addition to those described above. The present application will be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
fig. 1 is a schematic diagram of network connection principle of a positioning system for passive optical detection of a target position according to a preferred embodiment of the present application.
Fig. 2 is a functional block diagram of a visible light transceiving node according to a preferred embodiment of the present application.
Fig. 3 is a schematic diagram of a visible light differential pulse position modulation waveform according to a preferred embodiment of the present application.
Fig. 4 is a schematic diagram of a visible light communication link established via reflection from a target surface in accordance with a preferred embodiment of the present application.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a preferred embodiment of the present application provides a positioning system for passive optical detection of a target position, including:
n visible light transceiving nodes (n is an integer greater than 1) which are installed and arranged at various set positions in the field and are used for emitting narrow light beams endowed with unique ID information to various set illumination areas in the field for illumination, receiving visible light reflected by a target and adjusting related data information of the visible light;
and the central information processing unit is in signal connection with each visible light receiving and transmitting node and is used for carrying out positioning calculation according to the visible light reflected by the target and the ID information of the visible light regulated out so as to obtain the positioning target position.
Compared with the prior art, the embodiment has the following beneficial effects:
the embodiment designs a passive optical target position detection system, which enables a visible light beam to carry unique ID information by applying a visible light communication technology, so that the visible light beam can be recognized by a receiving end, a reliable visible light communication link is enabled and established by reflection on a target with a high-reflectivity smooth surface, and data obtained by communication can be used for further positioning the target. The embodiment gives consideration to the original lighting function of the indoor lighting system, and realizes the transformation of the original LED lighting source by adding low-cost hardware, so that the indoor lighting system has two functions of lighting and communication. The prototype machine developed based on the embodiment is proved to be feasible through experiments, the characteristics of visible light and the special requirements of a positioning system on targets can help the application find application environments in certain limited scenes, such as positioning automobiles in indoor parking lots or positioning metal parts in warehouses, and the like, and can play a more positive role in places with more limitations, such as places inconvenient to use mobile phones for positioning, such as hospitals and airport inner part areas where mobile phones are forbidden, so that the application range is greatly improved, the cost is low, the system is simple, the popularization is easy, and the application prospect in the market is wide.
Preferably, as shown in fig. 2, the visible light transceiving node includes:
the singlechip outputs control pulses for controlling the on and off of the LEDs, performs ADC sampling on output signals of the visible light detection circuit, demodulates ID information contained in the visible light from the output signals, and determines which narrow beam the visible light comes from;
the LEDs are connected with the GPIO interface circuit of the singlechip through the LED driving circuit and are used for providing a plurality of narrow light beams with corresponding irradiation distances according to control pulses output by the singlechip to jointly form an illumination area of a node;
the visible light detection circuit is connected with the ADC sampling interface circuit of the singlechip through the receiving circuit and is used for receiving visible light reflected by a target;
and the serial port receiving and transmitting circuit is used for realizing the communication between the singlechip of each node and the central information processing unit, so that each node can be controlled by the central processing unit and send the related data information of the visible light obtained in the visible light communication to the central processing unit, thereby completing the positioning function.
In this embodiment, the plurality of LEDs may provide a plurality of narrow light beams with long illumination distances to form an illumination area of a node together, so that not only enough illuminance in the area can be ensured, but also each narrow light beam can be endowed with unique ID information. One photodiode PD has a large detection area, a sufficiently large field angle to receive visible light reflected from a target. The singlechip outputs control pulses for controlling the on and off of the LEDs from the GPIO peripheral, and carries out ADC sampling on the output signals of the visible light detection circuit, demodulates the IDs contained in the visible light from the ADC signals, and determines which narrow light beam the visible light comes from. The serial port receiving and transmitting circuit is used for realizing the communication between the control singlechip (UART peripheral) of each node and the remote central information processing unit, so that each node can receive the control of the central processing unit and transmit the data obtained in the visible light communication to the central processing unit, thereby completing the positioning function.
Preferably, to ensure constant and adjustable illumination, we choose to adjust the visible light using differential pulse position modulation DPPM (Differential Pulse Position Modulation), see fig. 3 for schematic illustration. When the singlechip outputs control pulses for controlling the on and off of the LEDs, DPPM is modulated by using differential pulse positions to adjust visible light, each pulse has the same amplitude and width, the interval between the falling edge of the previous pulse and the next rising edge is used for representing 1 or 0, the short interval is 1, the long interval is 0, the quantity ratio of 0 to 1 is ensured to be unchanged when ID information of each narrow beam is designed, and the average value of the lengths is equal to the pulse interval length when the LEDs do not perform visible light communication; assuming that the amplitude and the width of the pulse are unchanged when the LED does not perform visible light communication, changing the brightness by adjusting the duty ratio, namely the pulse interval, wherein the interval is t1; the short interval representing 1 is t2, the long interval representing 0 is t3, and the number of 1 is x in n numbers, then the following formula is satisfied:
t2<t1<t3；
by the method, whether the LED is in visible light communication or not can be guaranteed, the duty ratio of the LED is unchanged, that is, the brightness of the LED is unchanged, the stability of illumination brightness is guaranteed, and the influence of brightness change on illumination effect and user experience is avoided.
Preferably, the visible light detection circuit comprises a photosensitive sensor, the photosensitive sensor is connected with the ADC sampling interface circuit of the singlechip through a receiving circuit, the photosensitive sensor adopts a photodiode, and the receiving circuit adopts a photodiode receiving circuit, so that the cost is low, and the system is stable and reliable.
Preferably, the serial port transceiver circuit adopts a wireless serial port transceiver module or a wired serial port transceiver module. The wireless serial port transceiver module comprises WIFI, bluetooth and ZigBee. The wired serial port transceiver module comprises an RS422 and R485 bus network.
In this embodiment, the selection of the serial port transceiver circuit depends on the actual application occasions, and the mature wireless modules can be selected to form a wireless local area network such as WIFI, bluetooth, zigBee, and the like, and bus networks such as RS422, R485, and the like can be built, so that the needs of different application occasions are met, and the system is flexible and reliable.
Preferably, the central information processing unit adopts a computer with a graphical user interface GUI, and the computer performs positioning calculation according to the visible light reflected by the target and the ID information of the visible light regulated, so as to obtain the position of the positioning target and display the position on the graphical user interface GUI, thereby facilitating the user to timely and intuitively know the positioning result.
In this embodiment, the central information processing unit is usually a computer, such as a PC or Laptop, and communicates with all the visible light receiving and transmitting nodes through serial ports, and implements remote control on the LEDs through a single-chip microcomputer on the nodes, and receives data obtained in the visible light communication that the visible light detection circuit in each node successfully establishes a link. Through the data, the PC can execute a positioning algorithm to obtain a positioning target position and display the positioning target position on a graphical user interface GUI on a computer display screen, and the network connection diagram is shown in figure 1.
Preferably, the system for passively optically detecting the target position further includes a reflective tag disposed on the target object, for reflecting the visible light from the visible light receiving and transmitting node, so as to facilitate positioning an object with poor surface reflection characteristics, such as an object with rough surface or a surface with strong light absorption.
As a passive positioning, the present application does not require that the positioning target carry the electronic device actively participate in the positioning process. However, in order to realize reliable visible light communication by utilizing the reflection characteristics of the target surface to realize positioning, the target is required to have a smooth surface with high reflectivity and a surface area which is large enough (larger than the effective area of the light detector), but the invention can only position the target, but for an object which does not have the smooth surface with high reflectivity and has an insufficient surface area, the embodiment can conveniently position the object with poor self-surface reflection characteristics, such as an object with rough surface or an object with strong surface absorptivity to light, by arranging the reflection label on the target object, and the application range of the application can be greatly expanded.
The positioning principle of the above embodiment will be briefly described below
When we arrange the visible light receiving and transmitting nodes, each node emits a plurality of groups of narrow light beams, one of the light beams irradiates the target surface, and after reflection, the light beams are detected by a certain visible light receiving and transmitting node, and the geometric relationship is shown in fig. 4. The node i and the node j are respectively a transmitting node and a receiving node of visible light communication, and a black thick line segment on the ground represents the surface of a target, so that the surface area is large enough, the reflectivity is high, and the reliability of the visible light communication link after reflection is ensured. The information detected by each node is finally communicated to the PC via the serial port, and from the successful visible light communication in fig. 4 we can get a simple conclusion: the target is positioned within an area illuminated by a known narrow beam. The information of all visible light receiving and transmitting nodes can be summarized on the PC, and if a plurality of successful visible light communication links exist or the inclination angle of the surface of the target and the historical movement track of the target are known, the positioning algorithm can be applied to calculate the position of the target more accurately.
In summary, the present application forms a positioning system by arranging a plurality of groups of transmitting and receiving nodes of visible light communication VLC, each transmitting node ensures that its transmitting beam has unique ID information, modulates the ID information into the beam by fast switching LEDs, and when a target having a smooth surface enters a positioning area, reflects the modulated beam onto the receiving node by means of its smooth surface to form an optical communication path, and the ID information demodulated by the receiving node reveals that the positioned target is within a defined area covered by the beam. By reasonably designing the transmitting and receiving nodes and properly arranging the transmitting nodes and the receiving nodes, a loose region positioning technology can be realized.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. A positioning system for passive optical detection of a target location, comprising:
a plurality of visible light receiving and transmitting nodes which are arranged at all set positions in the field and are used for transmitting narrow light beams endowed with unique ID information to all set illumination areas in the field for illumination, receiving visible light reflected by a target and adjusting related data information of the visible light;
and the central information processing unit is in signal connection with each visible light receiving and transmitting node and is used for carrying out positioning calculation according to the visible light reflected by the target and the ID information of the visible light regulated out so as to obtain the positioning target position.
2. The passive optical detection target location positioning system according to claim 1, wherein: the visible light receiving and transmitting node comprises:
the singlechip outputs control pulses for controlling the on and off of the LEDs, performs ADC sampling on output signals of the visible light detection circuit, demodulates ID information contained in the visible light from the output signals, and determines which narrow beam the visible light comes from;
the LEDs are connected with the GPIO interface circuit of the singlechip through the LED driving circuit and are used for providing a plurality of narrow light beams with corresponding irradiation distances according to control pulses output by the singlechip to jointly form an illumination area of a node;
the visible light detection circuit is connected with the ADC sampling interface circuit of the singlechip through the receiving circuit and is used for receiving visible light reflected by a target;
and the serial port receiving and transmitting circuit is used for realizing the communication between the singlechip of each node and the central information processing unit, so that each node can be controlled by the central processing unit and send the related data information of the visible light obtained in the visible light communication to the central processing unit, thereby completing the positioning function.
3. The passive optical detection target position locating system according to claim 2, wherein: when the singlechip outputs control pulses for controlling the on and off of the LEDs, DPPM is modulated by using differential pulse positions to adjust visible light, each pulse has the same amplitude and width, the interval between the falling edge of the previous pulse and the next rising edge is used for representing 1 or 0, the short interval is 1, the long interval is 0, the quantity ratio of 0 to 1 is ensured to be unchanged when ID information of each narrow beam is designed, and the average value of the lengths is equal to the pulse interval length when the LEDs do not perform visible light communication; assuming that the amplitude and the width of the pulse are unchanged when the LED does not perform visible light communication, changing the brightness by adjusting the duty ratio, namely the pulse interval, wherein the interval is t1; the short interval representing 1 is t2, the long interval representing 0 is t3, and the number of 1 is x in n numbers, then the following formula is satisfied:
t2<t1<t3；
4. the passive optical detection target position locating system according to claim 2, wherein: the visible light detection circuit comprises a photosensitive sensor, and the photosensitive sensor is connected with an ADC sampling interface circuit of the singlechip through a receiving circuit.
5. The passive optical detection target location positioning system according to claim 4, wherein: the photosensitive sensor adopts a photodiode, and the receiving circuit adopts a photodiode receiving circuit.
6. The passive optical detection target position locating system according to claim 2, wherein: the serial port receiving and transmitting circuit adopts a wireless serial port receiving and transmitting module or a wired serial port receiving and transmitting module.
7. The passive optical detection target location positioning system of claim 6, wherein: the wireless serial port transceiver module comprises WIFI, bluetooth and ZigBee.
8. The passive optical detection target location positioning system of claim 6, wherein: the wired serial port transceiver module comprises an RS422 and R485 bus network.
9. The passive optical detection target location positioning system according to claim 1, wherein: the central information processing unit adopts a computer with a graphical user interface GUI, and the computer performs positioning calculation according to the visible light reflected by the target and the ID information of the visible light regulated out, so as to obtain the position of the positioning target and display the position on the graphical user interface GUI.
10. The passive optical detection target location positioning system of claim 1, further comprising a reflective tag disposed on the target object for reflecting visible light from the visible light transceiver node.
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| CN202311543918.6A CN117630817A (en) | 2023-11-20 | 2023-11-20 | Positioning system for passive optical detection target position |
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| CN202311543918.6A CN117630817A (en) | 2023-11-20 | 2023-11-20 | Positioning system for passive optical detection target position |
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