UWB positioning base station circuit based on double-antenna PDOA measurement

Abstract

The utility model discloses a UWB positioning base station circuit based on double-antenna PDOA measurement, which comprises a power supply management module, a main control module, a communication interface module, a wireless communication module, a sensor, a peripheral module and a circuit protection and filtering module, and is characterized in that the power supply management module comprises an input power supply interface, a voltage regulator and a filtering capacitor; the main control module comprises a microcontroller and a clock source; compared with a traditional multi-base-station positioning system, the circuit adopts PDOA and AOA technologies, positioning can be achieved only through one base station, the number of base stations is greatly reduced, and therefore the hardware cost and the installation and maintenance cost are reduced; the single-base-station positioning system is relatively simple to install, synchronization among a plurality of base stations and complex arrangement of positioning points do not need to be considered, and manpower and time cost is saved; the single base station system is easier to deploy and move and is suitable for various application scenes such as warehouse management and industrial automation, and the rearrangement cost caused by site change is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of positioning base station circuits, and particularly relates to a UWB positioning base station circuit based on dual-antenna PDOA measurement. Background Technique

[0002] UWB (Ultra Wide Band) positioning technology is widely used in indoor positioning, industrial automation, robot navigation and other fields due to its high precision, high resolution and anti-multipath interference ability. Traditional UWB positioning systems mainly adopt TOF (Time of Flight) or TDOA (Time Difference of Arrival) measurement methods, which require multiple base stations to work together and determine the target position by measuring the time difference of signals arriving at different base stations. This solution requires complex base station synchronization and signal processing algorithms, with high costs and great difficulties in installation and maintenance.

[0003] The PDOA (Phase Difference of Arrival) measurement method uses two antennas to receive the same signal and calculates the Angle of Arrival (AOA) of the signal by comparing the phase difference of the signals received by the two antennas. This method can overcome the limitations of traditional single-antenna ranging schemes and achieve higher-precision three-dimensional positioning. The PDOA scheme only needs one base station to complete the positioning task, simplifies the system structure, reduces costs, and improves the flexibility and applicability of the system.

[0004] There are still some problems in the existing PDOA schemes in practical applications:

[0005] 1. Hardware cost: Although the cost of the PDOA scheme is lower than that of the multi-base station scheme, certain hardware investments are still required for the dual-antenna design and high-precision clock source, etc.;

[0006] 2. System complexity: The PDOA scheme needs to perform phase difference measurement and AOA calculation, and requires complex signal processing algorithms, with relatively high requirements for system design;

[0007] 3. Anti-interference ability: Although the PDOA scheme has a certain anti-multipath interference ability, it will still be affected to a certain extent in a complex environment, and the signal processing algorithm needs to be further optimized. Content of the Utility Model

[0008] The technical problem to be solved by the utility model is to overcome the existing defects and provide a UWB positioning base station circuit based on dual-antenna PDOA measurement, so as to solve the problems of hardware cost, system complexity and anti-interference ability mentioned in the above background technique.

[0009] To achieve the above object, the present utility model provides the following technical solutions: A UWB positioning base station circuit based on dual-antenna PDOA measurement, including a power management module, a main control module, a communication interface module, a wireless communication module, a sensor and peripheral module, and a circuit protection and filtering module.

[0010] Power management module: It includes an input power interface, a voltage regulator, and a filter capacitor.

[0011] Main control module: It includes a microcontroller and a clock source.

[0012] Communication interface module: It includes a USB communication interface and a debugging interface.

[0013] Wireless communication module: It includes a UWB chip and dual antennas. The UWB chip communicates with the microcontroller through an SPI interface, and the dual antennas respectively correspond to two different signal channels.

[0014] Sensor and peripheral module: It includes an EEPROM, an OLED display, and an LED indicator.

[0015] Circuit protection and filtering module: It includes a power filter circuit and a protection circuit.

[0016] Preferably, in the power management module, the voltage regulator is used to convert the input voltage into the voltage required by the circuit, and the filter capacitor is used to filter out power supply noise.

[0017] Preferably, in the main control module, the microcontroller is used to control the operation of the circuit and process data, and the clock source provides a clock signal for the microcontroller.

[0018] Preferably, in the communication interface module, the USB communication interface is used to communicate with a PC or other devices, and the debugging interface is used to debug and program the circuit.

[0019] Preferably, in the wireless communication module, the UWB chip is used to send and receive UWB signals and perform PDOA measurement, and the dual antennas respectively correspond to two different signal channels.

[0020] Preferably, in the sensor and peripheral module, the EEPROM is used to store system configurations or other data, the OLED display is used to display system status or data, and the LED indicator is used to indicate the operating status of the circuit.

[0021] Preferably, in the circuit protection and filtering module, the power filter circuit is used to filter out power supply noise, and the protection circuit is used to protect the circuit from overvoltage, overcurrent, etc.

[0022] Preferably, the UWB chip communicates with the microcontroller through an SPI interface.

[0023] Preferably, the two antennas respectively correspond to two different signal channels.

[0024] Preferably, the circuit has a high-precision clock source and high anti-interference ability.

[0025] Compared with the prior art, the present utility model provides a UWB positioning base station circuit based on dual-antenna PDOA measurement, having the following beneficial effects:

[0026] 1. Compared with the traditional multi-base station positioning system, this circuit adopts PDOA and AOA technologies, and only one base station is required to achieve positioning, significantly reducing the number of base stations, thereby reducing the hardware cost and installation and maintenance costs; the installation of the single-base station positioning system is relatively simple, without considering the synchronization between multiple base stations and the complex layout of positioning points, saving labor and time costs; the single-base station system is easier to deploy and move, suitable for various application scenarios such as warehouse management and industrial automation, reducing the redeployment cost due to site changes;

[0027] 2. The circuit of the present utility model adopts a single-base station design, avoiding the synchronization problem and simplifying the system design; multiple base stations and related synchronization devices increase the hardware cost of the system. By reducing the number of base stations, this circuit significantly reduces the hardware investment and the system complexity; the multi-base station configuration of the traditional system is complex, requiring precise installation positions and synchronization calibration, with high maintenance costs. This circuit simplifies the installation and maintenance process and reduces the system complexity;

[0028] 3. The dual-antenna design and phase difference measurement of the present utility model can more effectively resist multipath interference, improving the positioning accuracy and reliability; the high-precision clock and advanced signal processing algorithms can filter out environmental noise and multipath interference, improving the positioning accuracy; it can distinguish small angular changes and provide more stable and reliable positioning performance even in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0030] Figure 1 is a schematic diagram of the UWB antenna array proposed by the present utility model;

[0031] Figure 2 is a circuit diagram of the UWB signal reception proposed by the present utility model;

[0032] Figure 3 is a circuit diagram of the UWB signal processing proposed by the present utility model;

[0033] Figure 4Component diagram of the UWB positioning system proposed by the present utility model;

[0034] Figure 5 Circuit diagram of the UWB signal power amplifier proposed by the present utility model;

[0035] Figure 6 Circuit diagram of the UWB signal transmitter proposed by the present utility model;

[0036] Figure 7 Circuit diagram of the UWB signal receiver and transmitter proposed by the present utility model;

[0037] Figure 8 Circuit diagram of the UWB base station proposed by the present utility model;

[0038] Figure 9 Circuit diagram of the UWB tag proposed by the present utility model;

[0039] Figure 10 Circuit diagram of the UWB positioning system control proposed by the present utility model;

[0040] Figure 11 Circuit diagram of the receiving or transmitting module of the UWB system proposed by the present utility model;

[0041] Figure 12 Circuit diagram of the antenna of the UWB system proposed by the present utility model;

[0042] Figure 13 Circuit diagram of the digital signal processing part of the UWB system proposed by the present utility model;

[0043] Figure 14 Circuit diagram of the power management of the UWB system proposed by the present utility model. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0045] Please refer to Figure 1-14 , the present utility model provides a technical solution: a UWB positioning base station circuit based on dual-antenna PDOA measurement, including:

[0046] Power management module: It includes an input power interface, a voltage regulator, and a filter capacitor, and is used to provide a stable power supply for the circuit. The input power interface uses a USB interface, the voltage regulator uses an RT9078 series chip, and the filter capacitor uses a 0.1uF ceramic capacitor.

[0047] Main control module: It includes a microcontroller and a clock source, and is used to control the operation of the circuit and process data. The microcontroller uses an STM32F103CBT6 chip, and the clock source uses an 8MHz external crystal oscillator.

[0048] Communication interface module: It includes a USB communication interface and a debugging interface, and is used to communicate with other devices. The USB communication interface uses a CH340E chip to realize the conversion from USB to serial port, and the debugging interface uses a SWD interface.

[0049] Wireless communication module: It includes a UWB chip and a dual antenna, and is used to send and receive UWB signals and perform PDOA measurements. The UWB chip uses a DW3220 chip, the dual antenna corresponds to two different signal channels respectively, and is connected by a 50-ohm microstrip line.

[0050] Sensor and peripheral module: It includes an EEPROM, an OLED display, and LED indicators, and is used to store system configurations, display system status, and indicate the operating status of the circuit. The EEPROM uses an AT24C02 chip, the OLED display uses an OLED-0.66, and the LED indicators use multiple LEDs.

[0051] Circuit protection and filtering module: It includes a power filter circuit and a protection circuit, and is used to protect the circuit from overvoltage, overcurrent, etc., and filter out power supply noise. The power filter circuit includes multiple capacitors and inductors, and the protection circuit includes a TVS diode and a protection resistor.

[0052] In the present utility model, preferably, the UWB chip communicates with the microcontroller through an SPI interface. The SPI interface uses a 4-wire system, including a clock line, a data input line, a data output line, and a chip select line.

[0053] In the present utility model, preferably, the circuit has a high-precision clock source and high anti-interference ability. Among them, the clock source uses a 38.4MHz high-precision, active crystal oscillator, and is shielded by a metal shielding cover.

[0054] In the present utility model, preferably, the circuit uses a PCB board for circuit board design. The PCB board uses a 4-layer board, including a top layer, a bottom layer, a power layer, and a ground layer, to improve the signal integrity and anti-interference ability of the circuit.

[0055] Working principle and usage process of the present utility model: By measuring the phase difference and propagation time difference of the UWB signals received by two antennas, and combining signal processing algorithms to calculate the arrival angle of the signals and the position information of the positioning tag, a positioning function with high precision, high resolution, and anti-interference is achieved. This circuit is powered by a USB interface, with the STM32F103CBT6 chip as the main control unit, the DW3220 chip as the UWB chip, and two antennas for signal reception, and communicates with the microcontroller through the SPI interface. In addition, this circuit also includes peripherals such as EEPROM, OLED display screen, and LED indicator lights, as well as a power filter circuit and a protection circuit to ensure the stability and reliability of the circuit. This circuit has advantages such as reduced hardware cost, reduced system complexity, and improved anti-interference ability, and can be applied to various scenarios such as indoor navigation, robot positioning, and asset tracking.

[0056] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model, and the scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A UWB positioning base station circuit based on dual-antenna PDOA measurement includes a power management module, a main control module, a communication interface module, a wireless communication module, a sensor and peripheral module, and a circuit protection and filtering module, characterized in that: Power management module: including input power interface, voltage regulator and filter capacitor; Main control module: including microcontroller and clock source; Communication interface module: including USB communication interface and debugging interface; Wireless communication module: includes UWB chip and dual antennas, where the UWB chip communicates with the microcontroller through the SPI interface, and the dual antennas correspond to two different signal channels respectively; Sensor and peripheral modules: including EEPROM, OLED display and LED indicator; Circuit protection and filtering module: includes power supply filtering circuit and protection circuit.

2. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: In the power management module, the voltage regulator is used to convert the input voltage into the voltage required by the circuit, and the filter capacitor is used to filter out power supply noise.

3. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: In the main control module, the microcontroller is used to control the operation of the circuit and process data, and the clock source provides a clock signal for the microcontroller.

4. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: In the communication interface module, the USB communication interface is used to communicate with a PC or other devices, and the debugging interface is used to debug and program the circuit.

5. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: In the wireless communication module, the UWB chip is used to send and receive UWB signals and perform PDOA measurement, and the dual antennas correspond to two different signal channels respectively.

6. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: In the sensor and peripheral module, the EEPROM is used to store system configuration or other data, the OLED display screen is used to display system status or data, and the LED indicator light is used to indicate the operating status of the circuit.

7. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: In the circuit protection and filtering module, the power filter circuit is used to filter out power noise, and the protection circuit is used to protect the circuit from overvoltage and overcurrent damage.

8. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: The UWB chip communicates with the microcontroller via an SPI interface.

9. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: The dual antennas correspond to two different signal channels respectively.

10. The UWB positioning base station circuit based on dual-antenna PDOA measurement according to claim 1, characterized in that: The circuit has a high-precision clock source and high anti-interference capability.

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