UWB positioning base station circuit based on high-precision low-temperature drift clock circuit

Abstract

The utility model discloses a UWB (Ultra Wideband) positioning base station circuit based on a high-precision low-temperature drift clock circuit, which comprises a power management module, a clock module, a core processor module, a communication interface module, a radio frequency front end module, a battery management module and a reset enabling circuit, the clock module comprises a high-precision low-temperature drift crystal oscillator and a related capacitor, and is used for providing a clock signal required by the system; the core processor module is composed of a UWB chip and used for processing sending and receiving of UWB signals. According to the utility model, the high-precision and low-temperature drift crystal oscillator is adopted, so that the clock error is effectively reduced, and the precision of the TDOA positioning system is further improved, which means that the position calculation of the positioning label is more accurate, the application scenarios are wider, for example, in the fields of industrial automation, personnel positioning and unmanned driving, the finer positioning requirement can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of wireless communication and positioning, and particularly relates to a UWB positioning base station circuit based on a high-precision low-temperature drift clock circuit. Background Technique

[0002] With the development of wireless communication and positioning technologies, ultra-wideband (UWB) positioning technology has shown extremely high precision and reliability in the field of indoor positioning. Among them, the TDOA positioning method has been widely used due to its unique technical advantages. In such a positioning system, the accuracy of the clock plays a decisive role in the accuracy of the positioning result. In particular, the active crystal oscillator has become a key component in the UWB positioning base station circuit because of its characteristics of directly outputting a stable clock signal, low temperature drift, and high precision.

[0003] Although existing UWB positioning base stations generally use active crystal oscillators to improve clock accuracy, there are still some technical problems, that is, the crystal oscillators in the current technology may be insufficient in terms of frequency stability, temperature stability, and phase noise and jitter. These problems limit the accuracy and reliability of the positioning system. Especially in complex and changeable actual application environments, the error accumulation caused by clock deviation and temperature drift will seriously affect the positioning effect. Therefore, how to further improve the accuracy and stability of the clock circuit has become an urgent problem to be solved in the current UWB positioning technology. Content of the Utility Model

[0004] 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 a high-precision low-temperature drift clock circuit, so as to solve the problems that the crystal oscillators in the current technology may be insufficient in terms of frequency stability, temperature stability, and phase noise and jitter. These problems limit the accuracy and reliability of the positioning system. Especially in complex and changeable actual application environments, the error accumulation caused by clock deviation and temperature drift will seriously affect the positioning effect. Therefore, how to further improve the accuracy and stability of the clock circuit has become an urgent problem to be solved in the current UWB positioning technology.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A UWB positioning base station circuit based on a high-precision low-temperature drift clock circuit, including a power management module, a clock module, a core processor module, a communication interface module, a radio frequency front-end module, a battery management module, and a reset enable circuit. The power management module includes a voltage regulator, an inductor, a capacitor, and a resistor element;

[0006] The clock module includes a high-precision low-temperature drift crystal oscillator and related capacitors, and is used to provide the clock signal required by the system;

[0007] The core processor module is composed of a UWB chip and is used to process the sending and receiving of UWB signals;

[0008] The communication interface module includes a USB communication interface and a wireless communication module interface;

[0009] The RF front-end module includes RF capacitors and inductors;

[0010] The battery management module includes a charging management chip;

[0011] The reset enable circuit includes a reset chip and related resistors.

[0012] Preferably, the crystal oscillator in the clock module has a frequency of 38.4 MHz and has the characteristics of low temperature drift and high precision.

[0013] Preferably, the UWB chip in the core processor module is of the DW1000 model.

[0014] Preferably, the USB communication interface in the communication interface module is used to communicate with a PC or other devices.

[0015] Preferably, the communication interface module includes a wireless communication module interface for connecting a wireless communication module.

[0016] Preferably, the RF components in the RF front-end module are used to ensure the matching and filtering of UWB signals and guarantee the signal quality.

[0017] Preferably, the charging management chip in the battery management module is used to manage the charging and discharging of lithium batteries and ensure the stable power supply of the system.

[0018] Preferably, the reset enable circuit is used to control the reset and enable of the system and ensure the normal operation of the system.

[0019] Preferably, the crystal oscillator in the clock module is an active crystal oscillator with a built-in oscillation circuit that directly outputs a stable clock signal.

[0020] Preferably, the UWB chip communicates with the microcontroller through an SPI interface.

[0021] Compared with the prior art, the present utility model provides a UWB positioning base station circuit based on a high-precision low-temperature-drift clock circuit, having the following beneficial effects:

[0022] 1. The utility model adopts a crystal oscillator with high precision and low temperature drift, effectively reducing the clock error, thereby improving the accuracy of the TDOA positioning system. This means that the position calculation of the positioning tag is more accurate and the application scenarios are more extensive. For example, in the fields of industrial automation, personnel positioning, and unmanned driving, it can meet more refined positioning requirements and effectively avoid the possible deficiencies of the crystal oscillator in the current technology in terms of frequency stability, temperature stability, phase noise, and jitter. These problems limit the accuracy and reliability of the positioning system. Especially in complex and changeable actual application environments, the error accumulation caused by clock deviation and temperature drift will seriously affect the positioning effect. Therefore, how to further improve the accuracy and stability of the clock circuit has become an urgent problem to be solved in the current UWB positioning technology;

[0023] 2. By introducing a high-precision crystal oscillator, the utility model reduces the sensitivity of the UWB positioning base station circuit to temperature changes and vibration interference factors, thereby enhancing the stability of the system. This ensures that the system can still operate reliably in complex environments. For example, in outdoor and underground environments, the positioning results are more stable and reliable;

[0024] 3. The utility model adopts an active crystal oscillator, which does not require external circuit excitation, simplifies the circuit design, reduces the development cost and complexity. At the same time, the active crystal oscillator has a high integration level and occupies a small space, which is beneficial to reducing the volume and weight of the entire system and facilitating installation and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are used to provide a further understanding of the utility model and constitute a part of the specification. They are used together with the embodiments of the utility model to explain the utility model and do not constitute a limitation to the utility model. In the drawings:

[0026] Figure 1 is the circuit design diagram proposed by the utility model;

[0027] Figure 2 is the circuit diagram of the power management module proposed by the utility model;

[0028] Figure 3 is the circuit diagram of the clock module proposed by the utility model;

[0029] Figure 4 is the circuit diagram of the core processor module proposed by the utility model;

[0030] Figure 5 is the circuit diagram of the communication interface module proposed by the utility model;

[0031] Figure 6 is the circuit diagram of the radio frequency front-end module proposed by the utility model;

[0032] Figure 7The circuit diagram of the battery management module proposed by the present utility model;

[0033] Figure 8 The reset and enable circuit diagram proposed by the present utility model;

[0034] Figure 9 The circuit diagram of two power supply modules VDDPA1 and VDDPA2 proposed by the present utility model, as well as the capacitors, resistors and diode components connected thereto;

[0035] Figure 10 The circuit diagram of multiple resistors, capacitors and some specific electronic component labels proposed by the present utility model;

[0036] Figure 11 The connection circuit diagram of the USB interface and the single-chip microcomputer proposed by the present utility model;

[0037] Figure 12 The connection circuit diagram of U1B and the external circuit proposed by the present utility model;

[0038] Figure 13 The electronic circuit diagram of the structural schematic diagram proposed by the present utility model;

[0039] Figure 14 The layout diagram of electronic components or the PCB wiring diagram proposed by the present utility model;

[0040] Figure 15 The voltage dividing circuit composed of resistors and capacitors proposed by the present utility model. Specific implementation manners

[0041] 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0042] Please refer to Figures 1-15 , the present utility model provides a technical solution: a UWB positioning base station circuit based on a high-precision low-temperature drift clock circuit, including a power management module, a clock module, a core processor module, a communication interface module, a radio frequency front-end module, a battery management module and a reset enable circuit. The power management module includes voltage regulators RT9078-33GJ5 and RT9078-18GJ5, which are used to convert the input voltage into the voltages required for the 3.3V and 1.8V circuits and ensure voltage stability. The circuit also includes inductors BLM15AG601SN1D, capacitors 10uF and 4.7uF components, which are used to filter out power supply noise and ensure power supply quality;

[0043] The clock module includes a 38.4 MHz active crystal oscillator X2 and related capacitors, which provides a high-precision and low-drift clock signal for the system to ensure the accuracy of time measurement. The active crystal oscillator has a built-in oscillation circuit and does not require external circuit excitation, simplifying the circuit design;

[0044] The core processor module consists of a DW1000 UWB chip, which is the core of the entire system and is responsible for processing the transmission and reception of UWB signals. The UWB chip communicates with the microcontroller through the SPI interface to achieve data transmission and control;

[0045] The communication interface module includes a USB communication interface and a wireless communication module interface. The USB communication interface is used to communicate with a PC or other devices for system configuration and data transmission operations. The wireless communication module interface is used to connect to a wireless communication module, such as a Wi-Fi module, to achieve wireless data transmission;

[0046] The RF front-end module includes RF capacitors and inductors, which are used for RF signal matching and filtering to ensure the effective transmission and reception of UWB signals;

[0047] The battery management module includes a TP4056 charging management chip, which is used to manage the charging and discharging of the lithium battery to ensure the stable power supply of the system. The circuit also includes a battery voltage detection circuit, which is used to monitor the battery voltage to prevent overcharging or over-discharging;

[0048] The reset enable circuit includes a reset chip and related resistors, which are used to control the reset and enable of the system to ensure the normal operation of the system.

[0049] In the present utility model, preferably, the crystal oscillator frequency in the clock module is 38.4 MHz, and it has the characteristics of low temperature drift and high precision, ensuring high-precision positioning of the system in different temperature environments. The UWB chip in the core processor module is of the DW1000 model, which has the characteristics of high performance and low power consumption and can meet the requirements of high-precision positioning. The USB communication interface and the wireless communication module interface in the communication interface module facilitate users to perform system configuration, data transmission, and remote control.

[0050] The UWB positioning base station circuit structure of the present utility model is simple and reasonably designed, and can achieve high-precision, stable, and reliable positioning functions, and is applicable to industrial automation, personnel positioning, and unmanned driving scenarios.

[0051] Working principle and usage process of the present utility model: During use, by receiving the UWB pulse signal sent by the positioning tag, the active crystal oscillator with a built-in oscillation circuit provides a high-precision and low-drift clock signal to ensure accurate measurement of the signal arrival time by the base station. The microcontroller communicates with the UWB chip through the SPI interface, obtains the signal arrival timestamps recorded by each base station, and calculates the precise position of the positioning tag using the TDOA positioning algorithm based on the base station coordinates and time difference information. Finally, the calculated position information can be transmitted to a PC or other devices through the USB communication interface or wireless communication module for display, analysis, or further processing, such as plotting the positioning trajectory and counting the number of personnel. This circuit design takes into account power filtering and circuit protection measures to ensure stable and reliable operation of the system in various environments, simplifies the circuit design, reduces the development cost and complexity, making it an ideal choice for high-precision positioning systems.

[0052] 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. 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 a high-precision low-temperature drift clock circuit, including a power management module, a clock module, a core processor module, a communication interface module, a radio frequency front-end module, a battery management module and a reset enable circuit, characterized in that: The power management module includes a voltage stabilizer, an inductor, a capacitor and a resistor; The clock module includes a high-precision low-temperature drift crystal oscillator and related capacitors, which are used to provide the clock signal required by the system; The core processor module is composed of a UWB chip and is used to process the sending and receiving of UWB signals; The communication interface module includes a USB communication interface and a wireless communication module interface; The radio frequency front-end module includes radio frequency capacitors and inductors; The battery management module includes a charging management chip; The reset enabling circuit includes a reset chip and related resistors.

2. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1 is characterized in that: The crystal oscillator frequency in the clock module is 38.4 MHz, and has the characteristics of low temperature drift and high precision.

3. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1 is characterized in that: The UWB chip model in the core processor module is DW1000.

4. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1, characterized in that: The USB communication interface in the communication interface module is used to communicate with a PC or other devices.

5. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1, characterized in that: The communication interface module includes a wireless communication module interface for connecting to a wireless communication module.

6. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1, characterized in that: The radio frequency components in the radio frequency front-end module are used to ensure the matching and filtering of UWB signals and guarantee the signal quality.

7. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1, characterized in that: The charging management chip in the battery management module is used to manage the charging and discharging of the lithium battery to ensure stable power supply of the system.

8. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1, characterized in that: The reset and enable circuit is used to control the reset and enable of the system to ensure the normal operation of the system.

9. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1, characterized in that: The crystal oscillator in the clock module is an active crystal oscillator with a built-in oscillation circuit, which directly outputs a stable clock signal.

10. The UWB positioning base station circuit based on the high-precision low-temperature drift clock circuit according to claim 1, characterized in that: The UWB chip communicates with the microcontroller via an SPI interface.

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