A high-precision positioning system for physical protection based on wireless optical frequency communication technology

Abstract

The present invention discloses a high-precision positioning system for physical protection based on wireless optical frequency communication technology, including a positioning system receiver, which is used to complete the acquisition of spatial positioning information, plane position calibration, and directly provide positioning data for server system management software; a wireless optical frequency high-precision positioning transmitter, which is used to internally store basic material information, and send positioning data to free space through a positioning material information plate for identification and decoding by the positioning system receiver; server system management software, which is used to receive the plane position coordinates uploaded from the positioning system receiver, and the software display interface is used to view and display the position, and the positioning system receiver includes a collimating optical antenna, a narrowband filter, a positioning processor module, a two-degree-of-freedom pan-tilt, a housing, and a signal transmission cable. Compared with the prior art, the advantages of the present invention are: it has good electromagnetic compatibility and is suitable for monitoring and protecting important nuclear materials and weapons in situ.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless optical frequency communication, and in particular to a high-precision positioning system for physical protection based on wireless optical frequency communication technology. Background Art

[0002] Wireless optical frequency communication equipment has good electromagnetic compatibility and will not interfere with the normal operation of surrounding electromagnetic equipment. The equipment is designed with electromagnetic shielding inside to shield external electromagnetic interference. However, communication can be achieved in strong electromagnetic interference environments and electromagnetic shielding environments. The equipment protection and positioning methods for important materials, nuclear material depots, and arsenals with electromagnetic fuses are still imperfect, and it is impossible to find the location in real time when moving in a small range. The wireless optical frequency high-precision positioning system can provide a complete solution for physical protection. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a high-precision physical protection positioning system based on wireless optical frequency communication technology, which plays a key role in the positioning of valuables and is suitable for places with strict electromagnetic requirements and high safety levels of the positioned equipment and materials. The system can generate an alarm when the positioned material or equipment is displaced, and the server software can display the position change in real time, thereby playing a key role in the positioning of valuables.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a high-precision positioning system for physical protection based on wireless optical frequency communication technology, including a positioning system receiver, which is used to complete the acquisition of spatial positioning information, plane position calibration, and directly provide positioning data for server system management software; a wireless optical frequency high-precision positioning transmitter, which is used to internally store basic material information, and send the positioning data to free space through the positioning material information plate for identification and decoding by the positioning system receiver; the server system management software is used to receive the plane position coordinates uploaded from the positioning system receiver, and the software display interface is used to view and display the position, and the positioning system receiver includes a collimated optical antenna, a narrowband filter, a positioning processor module, and two automatic The invention comprises a two-degree-of-freedom gimbal, a shell and a signal transmission cable, the collimating optical antenna comprises a high-pass filter lens and an optical guide tube, the narrow-band filter comprises a narrow-band filter and a bracket, the shell comprises an upper shell cover and a lower shell cover, the positioning processor module is arranged between the upper shell cover and the lower shell cover, the bracket is arranged between the positioning processor module and the upper shell cover, the bracket is fixedly connected to the two-degree-of-freedom gimbal and fixes the positioning processor module and the lower shell cover on the two-degree-of-freedom gimbal, the narrow-band filter is arranged between the upper shell cover and the bracket, the upper shell cover is connected to the lower shell cover by clamping and clamps the narrow-band filter on the bracket, the high-pass filter lens is arranged on the optical guide tube, and the optical guide tube is arranged on the upper shell cover;

[0005] The wireless optical frequency high-precision positioning transmitter includes screws, a transmitter upper shell, an ink screen, a control board, a lithium battery, a transmitter lower shell and nuts. The control board is arranged between the transmitter upper shell and the transmitter lower shell, the ink screen is arranged between the transmitter upper shell and the control board, the lithium battery is arranged between the control board and the transmitter lower shell, and the transmitter upper shell and the transmitter lower shell are fixed by screws and nuts.

[0006] Furthermore, the high-pass filter lens filters out the visible light band, filters out the positioning background noise, and reduces the initial energy entering the optical guide tube; the antenna collimation optical guide tube allows the incoming spatial light signal to be irradiated to the narrowband filter without loss during the optical path transmission process; the narrowband filter uses a high-temperature particle evaporation process, through the high-temperature particle evaporation dielectric film, the substrate is K9 glass, the finished filter is designed with a central wavelength of 940nm, and some light waves with a wavelength higher than 940nm are filtered out, so that the receiver positioning processing unit receives the light signal with less background noise.

[0007] Furthermore, the positioning processor module includes a front-end receiving module wireless optical frequency acquisition unit and a motion control module servo control unit. The front-end receiving module wireless optical frequency acquisition unit is composed of a photoelectric receiving unit, an optical signal detection, a signal processing unit, an MCU modulation and demodulation unit and a communication interface. The motion control module servo control unit is composed of a data acquisition module, a data processing module, an angle control module, a server communication module and a debugging system module.

[0008] After adopting the above structure, the present invention has the following advantages: it has good electromagnetic compatibility and is suitable for on-site monitoring and protection of important nuclear materials and weapons; it is suitable for positioning materials in electromagnetic blind areas and electromagnetic sensitive areas; it has a small size, light weight, a long working time, extremely strong anti-interference ability and trouble-free working time, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the bandwidth diagram of the narrowband filter of the present invention.

[0010] Figure 2 It is a principle block diagram of the wireless optical frequency acquisition unit of the front-end receiving module of the present invention.

[0011] Figure 3 This is a diagram of the circuit managing PD power supply of the present invention.

[0012] Figure 4 It is the principle diagram of the photoelectric receiving unit of the present invention.

[0013] Figure 5 It is a principle block diagram of the wireless optical frequency high-precision positioning signal transmitting unit of the present invention.

[0014] Figure 6This is the LED power supply diagram of the power management unit of the present invention.

[0015] Figure 7 This is a diagram of a transmitting unit of a wireless optical frequency high-precision positioning transmitter of the present invention.

[0016] Figure 8 This is the central wavelength diagram of the LED lamp bead of the present invention.

[0017] Fig. 9 It is a principle block diagram of the wireless optical frequency high-precision positioning transmitter of the present invention.

[0018] Fig.10 It is a control block diagram of a servo motor of a motion control module of the present invention.

[0019] Fig.11 It is a flow chart of the program of the present invention.

[0020] Fig.12 It is an exploded view of the positioning system receiver of the present invention.

[0021] Fig.13 It is an exploded view of the structure diagram of the wireless optical frequency high-precision positioning transmitter of the present invention.

[0022] As shown in the figure: 1. High-pass filter lens, 2. Optical guide tube, 3. Shell cover, 4. Narrow-band filter, 5. Bracket, 6. Positioning processor module, 7. Shell lower cover, 8. Two-degree-of-freedom platform, 9. Signal transmission cable, 10. Screws, 11. Transmitter upper shell, 12. Ink screen, 13. Control board, 14. Lithium battery, 15. Transmitter lower shell, 16. Nut. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inside", "top", "vertical", "horizontal", "both sides", "two ends", etc. in this article are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "place", "connect", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] As attached Figure 1-13 As shown, in the specific implementation of the present invention, a physical protection high-precision positioning system based on wireless optical frequency communication technology includes a positioning system receiver, which is used to complete the acquisition of spatial positioning information, plane position calibration, and directly provide positioning data for the server system management software; a wireless optical frequency high-precision positioning transmitter, which is used to internally store basic material information, and send the positioning data to the free space through the positioning material information card for the positioning system receiver to identify and decode; the server system management software is used to receive the plane position coordinates uploaded by the positioning system receiver, and the software display interface is used to view and display the position, as shown in the attached figure. Fig.12 As shown, the positioning system receiver includes a collimating optical antenna, a narrowband filter, a positioning processor module 6, a two-degree-of-freedom pan-tilt 8, a shell and a signal transmission cable 9, the collimating optical antenna includes a high-pass filter lens 1 and an optical guide tube 2, the narrowband filter includes a narrowband filter 4 and a bracket 5, the shell includes a shell upper cover 3 and a shell lower cover 7, the positioning processor module 6 is arranged between the shell upper cover 3 and the shell lower cover 7, the bracket 5 is arranged between the positioning processor module 6 and the shell upper cover 3, the bracket 5 is fixedly connected to the two-degree-of-freedom pan-tilt 8, and the positioning processor module 6 and the shell lower cover 7 are fixed on the two-degree-of-freedom pan-tilt 8, the narrowband filter 4 is arranged between the shell upper cover 3 and the bracket 5, the shell The upper cover 3 of the body is connected with the lower cover 7 of the shell body by snapping, and the narrow-band filter 4 is clamped on the bracket 5. The high-pass filter lens 1 is arranged on the optical guide tube 2, and the optical guide tube 2 is arranged on the upper cover 3 of the shell body; the server system management software is used to realize material warehousing statistics, positioning transmitter allocation, scene deployment, scene disarming, warehousing, map management, and material distribution query functions. The warehousing equipment and materials are monitored in situ, and a specific location distribution map is formed in the system for the first warehousing. The system fully recognizes the new warehousing materials and begins to enter the deployment stage. The location of the materials is displayed on the map. If the position of the materials changes during the deployment stage, the server system management software will alarm, and the map display interface will show the moving position and the moving distance.

[0027] As attached Fig.13As shown, the wireless optical frequency high-precision positioning transmitter includes screws 10, a transmitter upper shell 11, an ink screen 12, a control board 13, a lithium battery 14, a transmitter lower shell 15 and a nut 16. The control board 13 is arranged between the transmitter upper shell 11 and the transmitter lower shell 15, the ink screen 12 is arranged between the transmitter upper shell 11 and the control board 13, the lithium battery 14 is arranged between the control board 13 and the transmitter lower shell 15, the transmitter upper shell 11 and the transmitter lower shell 15 are fixed by screws 10 and nuts 16. The wireless optical frequency high-precision positioning transmitter is a signal source end of a positioning system. The terminal positioning transmitter has a simple structure, low manufacturing cost, and is easy to install. It is suitable for the positioning needs of materials and equipment with high concentration. The transmitter is fixed to the object to be positioned, has a unique ID, and is emitted into free space. The principle block diagram is as shown in the attached Figure 5 As shown; the positioning signal transmitting unit has two power supply modes: AC220V to DC12V adapter power supply and 12V battery power supply. When the device is powered by battery, the low power consumption function is enabled to increase the working time. The power management part converts the DC12V point to 6V, 5V and 3.3V required by the system to power the coding and modulation unit; DC12V is connected to the device, and the power management unit converts 12V to DC6V to power the transmitting LED. The LED uses Osram infrared 940nm LED, which has mature chips, stable shipments, high power to meet the requirements of different distances, and high scalability. The LED lamp beads are powered by adjustable linear voltage regulators to reduce noise. The wireless optical signal transmitting unit filters out the DC component through a filter to obtain a signal spectrum with better response. The voltage follower is designed to play a role of buffering and isolation, which will not affect the communication signal. The transmitting circuit has multiple triggering modes, which can be directly driven by the MCU or driven by the DAC. The coding and modulation part is completed inside the MCU, and the 168MHz main frequency is selected, which has high performance and meets the needs of short-distance low-rate communication, as shown in the attached figure. Figure 6-7 As shown; the maximum power of the transmitting lamp is 5W, 940nm, and the spectrum curve is as shown in the attached Figure 8As shown, it is concentrated around 930-960. This wavelength range is less in the indoor background environment. The 940nm wavelength does not belong to the atmospheric window. The corresponding wavelength of sunlight passing through the atmosphere will be partially filtered out, and the impact of ambient light is small. The coding modulation unit of the wireless optical frequency high-precision positioning transmitter stores the positioning material information and uses 8B / 10B channel coding technology to process the digital stream accordingly. The 8B / 10B coding converts the 8-bit data to be sent into a 10-bit code group to ensure DC balance and sufficiently dense level conversion. The modulation technology uses OOK modulation technology to control the opening and closing of the sinusoidal carrier with a unipolar non-return-to-zero code sequence. The system controls the transmission of positioning data through MCU. The MCU controls the DC component to pass through R203. The data stream passes through R207 to load the positioning data into the DC component, control the on-off of MOS, drive the LED, and send it to free space through the LED lamp beads, as shown in the attached figure. Fig. 9 shown.

[0028] The high-pass filter lens 1 filters out the visible light band, removes the positioning background noise, and reduces the initial energy entering the optical guide tube; the optical guide tube 2 allows the incoming spatial light signal to be irradiated to the narrowband filter without loss during the optical path transmission process; the narrowband filter 4 uses a high-temperature particle evaporation process, through high-temperature particle evaporation of the dielectric film, the substrate is selected from K9 glass, and the finished filter is designed with a central wavelength of 940nm. The measured results are shown in the attached Figure 1 As shown, part of the light waves with a wavelength higher than 940nm is filtered out, so that the receiver positioning processing unit receives the light signal with less background noise.

[0029] The positioning processor module includes a front-end receiving module wireless optical frequency acquisition unit and a motion control module steering gear control unit. The front-end receiving module wireless optical frequency acquisition unit is composed of a photoelectric receiving unit, an optical signal detection unit, a signal processing unit, an MCU modulation and demodulation unit and a communication interface. The principle block diagram is shown in the attached figure. Figure 2 As shown; the motion control module steering gear control unit is composed of a data acquisition module, a data processing module, an angle control module, a server communication module and a debugging system module. The principle block diagram is shown in the attached Fig.10 As shown; the front-end receiving module wireless optical frequency acquisition unit is powered by DC12V, and the power management unit converts DC12V into DC10V and DC3.3V through an adjustable linear regulator LDO to power the processing unit, and its power supply diagram is as shown in the attached Figure 3 As shown in the figure, the photoelectric receiving unit is equipped with a variety of power supply interfaces. Different interfaces can be selected through jumpers. A variety of receiver interfaces are reserved to meet different positioning requirements. This product uses a Si PIN photodiode receiver. The signal is transmitted to the gain control unit through a voltage follower. The amplification factor is adjusted according to the signal strength. Figure 4 shown.

[0030] The adjustment principle of the present invention is as follows: the MCU modulation and demodulation part in the wireless optical frequency acquisition unit of the front-end receiving module is responsible for the positioning algorithm and data processing functions. The signal is amplified and transmitted to the MCU. Since the signal is distributed in free space, there are many background noises such as interference from the surrounding environment and reflection of ambient light. After passing through the gain control unit, the background noise is amplified together; the realization of high-precision positioning function is designed through both physical layer and software layer. The physical layer filter uses a narrow-band filter to filter out part of the background noise, and the original signal with a small amount of background noise and high energy domain is obtained through a first-order preamplifier and a second-order main amplifier. The positioning signal is unstable, and the positioning accuracy is ±25cm, which is greatly affected by the changes in the surrounding ambient light; the software layer high-precision positioning technology combines basic algorithms such as digital filtering technology DFT, energy dichotomy, and bubble sorting, and visible light energy field deviation algorithm EFDA (VLC Energyfield deviation algorithm), digitally filter the collected raw data, filter out sunlight noise, room lighting noise, and reflection noise in the first filtering, and reduce the internal noise of the system through multiple sampling in the second filtering, reduce the wireless optical frequency positioning error to ±3cm, obtain the energy field distribution model of the positioning signal in space, encapsulate it into a digital model block, establish an internal private protocol, and reserve a communication interface for the positioning actuator to perform positioning calls;

[0031] The data processing part communicates with the wireless acquisition unit of the front-end receiving module by calling the interface, calls the energy field digital model block data according to the internal private protocol, and uses the digital model block data as the basis for movement to perform two-dimensional angle control, achieving precise control of the horizontal and vertical resolution of 0.1 degrees. During the rotation process, the visible light front-end detection energy field distribution model is cyclically called, and the energy dichotomy method is used to quickly locate the range of the object being detected. The locking range gradually approaches the infinite bias maximum energy signal adjustment of the actuator to obtain the coordinates of the located object. The server communication part is responsible for data interaction with the background server. When the positioning point is determined, the system will send the current position to the server; the debugging part can help users or developers better operate or control the current system's operating status. During installation, it can help installers to debug and position, which is called zero-point calibration. At the same time, it also establishes a positioning model of the surrounding space within the system.

[0032] Positioning principle: The positioning transmitter uses a single wavelength 940nm LED as the emitting light source. The positioning transmitter in free space is infinitely close to a point light source. A spatial model of the attenuation of point light source light is established. There is refraction, absorption, and scattering of light in the air, and the influence of dust on light is very small at short distances. The model is established to ignore the influence of the atmosphere. The point light source is uniformly attenuated within the emission angle range. The light attenuates with the emission distance. The light energy is less than the required limit of the light sensitivity of the positioning system receiver, which is the positioning and identification range of this system. The positioning system receiver and the point light source are infinitely close to a straight line within the positioning range. The stronger the light energy transmitted by the optical guide tube, the positioning system detects the received light energy in real time to adjust the pan / tilt angle, and compares the database to find the coordinates of the maximum energy point, as shown in the attached figure. Fig.11 shown.

[0033] The present invention and its embodiments are described above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A high-precision positioning system for physical protection based on wireless optical frequency communication technology, including a positioning system receiver, which is used to complete the acquisition of spatial positioning information, plane position calibration, and directly provide positioning data for server system management software; a wireless optical frequency high-precision positioning transmitter, which is used to internally store basic material information, and send positioning data to free space through the positioning material information plate for identification and decoding by the positioning system receiver; server system management software, which is used to receive the plane position coordinates uploaded by the positioning system receiver, and the software display interface is used to view and display the position, and is characterized by: The positioning system receiver comprises a collimating optical antenna, a narrowband filter, a positioning processor module (6), a two-degree-of-freedom pan-tilt platform (8), a housing and a signal transmission cable (9); the collimating optical antenna comprises a high-pass filter lens (1) and an optical guide tube (2); the narrowband filter comprises a narrowband filter (4) and a bracket (5); the housing comprises a housing upper cover (3) and a housing lower cover (7); the positioning processor module (6) is arranged between the housing upper cover (3) and the housing lower cover (7); the bracket (5) is arranged on the positioning processor module (6) ) and the upper cover (3) of the housing, the bracket (5) is fixedly connected to the two-degree-of-freedom platform (8), and the positioning processor module (6) and the lower cover (7) of the housing are fixed on the two-degree-of-freedom platform (8), the narrow-band filter (4) is arranged between the upper cover (3) of the housing and the bracket (5), the upper cover (3) of the housing and the lower cover (7) of the housing are connected by snapping, and the narrow-band filter (4) is clamped on the bracket (5), the high-pass filter lens (1) is arranged on the optical guide tube (2), and the optical guide tube (2) is arranged on the upper cover (3) of the housing; The wireless optical frequency high-precision positioning transmitter comprises a screw (10), a transmitter upper shell (11), an ink screen (12), a control panel (13), a lithium battery (14), a transmitter lower shell (15) and a nut (16); the control panel (13) is arranged between the transmitter upper shell (11) and the transmitter lower shell (15); the ink screen (12) is arranged between the reflector upper shell (11) and the control panel (13); the lithium battery (14) is arranged between the control panel (13) and the transmitter lower shell (15); the transmitter upper shell (11) and the transmitter lower shell (15) are fixed by the screw (10) and the nut (16); The high-pass filter lens (1) filters out the visible light band, filters out the positioning background noise, and reduces the initial energy entering the optical guide tube; the optical guide tube (2) allows the incoming spatial light signal to be irradiated to the narrowband filter without loss during the optical path transmission process; the narrowband filter (4) uses a high-temperature particle evaporation process to deposit a dielectric film through high-temperature particle evaporation, and the substrate is selected from K9 glass. The finished filter is designed with a central wavelength of 940nm, and filters out part of the light waves with a wavelength higher than 940nm, so that the receiver positioning processing unit receives the light signal with less background noise; The positioning processor module includes a front-end receiving module wireless optical frequency acquisition unit and a motion control module steering gear control unit. The front-end receiving module wireless optical frequency acquisition unit is composed of a photoelectric receiving unit, an optical signal detection, a signal processing unit, an MCU modulation and demodulation unit, and a communication interface part. The motion control module steering gear control unit is composed of a data acquisition module, a data processing module, an angle control module, a server communication module and a debugging system module.

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