WO2020155437A1 - 4g network communication-based ground motion record acquisition and storage system - Google Patents

Abstract

A 4G network communication-based ground motion record acquisition and storage system, comprising acceleration sensors, analog signal processors, an analog to digital signal converter, a main control CPU controller, a remote wireless 4G communication system, a GPS time service system, a power supply conversion module, and a wind-solar complementary power supply system. The number of the acceleration sensors is three and the three acceleration sensors are respectively connected to the analog to digital signal converter by means of the respective analog signal processors; the analog to digital signal converter is bidirectionally connected to the main control CPU controller; and the main control CPU controller is bidirectionally connected to the remote wireless 4G communication system and the GPS time service system, respectively. By using mobile 4G communication technology for data communication, the large-scale monitoring and deployment of monitoring networks of a strong earthquake system can be implemented, thereby ensuring the reliability of strong earthquake monitoring. The system has the characteristics of flat frequency characteristic response, linear change of phase, good technical parameter consistency, stable and reliable performance, low power consumption, small size, and the like.

Description

A ground motion record collection and storage system for 4G network communication Technical field

The invention relates to the field of strong vibration monitoring, in particular to a strong vibration record collection system based on wireless technology.

Background technique

Strong motion recorder is an instrument that monitors the occurrence of earthquakes and records related parameters when earthquakes occur. Strong earthquake recorder is an automatically triggered seismograph that records strong earthquakes near the ground. It is generally composed of five parts: a seismic pickup system, a recording system, a trigger-start system, a time stamp system and a power supply system. With the country’s economic and social development, the country has established a network of seismic stations to monitor earthquakes to obtain seismic data. It also stipulates that major engineering structures and special building structures should also be equipped with seismic monitoring devices. The occurrence of earthquakes is unpredictable, and the intensity and impact of earthquakes cannot be predicted. This places very strict requirements on monitoring devices. However, current strong earthquake monitoring mostly relies on wired transmission, and data acquisition, transmission, and processing are completed independently. Usually, after an earthquake occurs, the strong earthquake recorder stores the seismic record data inside the instrument. In many cases, the transmission line is damaged. It is necessary for personnel to go to the site to retrieve the data and analyze the data after the earthquake. At this time, some strong motion instruments were completely damaged due to the super destructive effect of the earthquake or aftershocks, resulting in data loss, and the earthquake cannot be fully analyzed. Influence and data accumulation. Furthermore, wired transmission requires a large amount of wiring, and it is difficult to realize large-scale monitoring due to the large area and wide scope of the project site, which brings difficulties to the complete analysis of the seismic field. Traditional seismic instruments need to use 220V power supply, and some also use backup power. However, when a major destructive earthquake occurs, water, electricity, buildings, etc. will be severely damaged, and sometimes it may not be restored for a long time. Many aftershocks that occurred during this period cannot be recorded, and a complete record of an earthquake cannot be achieved. The limited storage space of seismic records of traditional seismographs causes the record data of an earthquake to not fully meet the requirements of data storage space.

Summary of the invention

The purpose of the present invention is to design a 4G network communication ground motion record collection and storage system, solve the problem of wired data transmission of traditional strong motion recorders, solve the power supply problem of traditional strong motion recorders, and solve the data storage space of traditional strong motion recorders To achieve large-scale, uninterrupted continuous seismic monitoring.

In order to achieve the above objective, the technical solution of the present invention is as follows:

A ground motion record collection and storage system for 4G network communication, including acceleration sensors, analog signal processors, analog-to-digital signal converters, main control CPU controllers, remote wireless 4G communication systems, GPS timing systems, power conversion modules, and scenery Complementary power supply system;

There are three acceleration sensors, namely, the north-south direction acceleration sensor, the east-west direction acceleration sensor and the vertical direction acceleration sensor. The north-south direction acceleration sensor, the east-west direction acceleration sensor and the vertical direction acceleration sensor respectively pass through their respective analog signal processors. Connected to the analog-to-digital signal converter; the analog-to-digital signal converter is bidirectionally connected to the main control CPU controller; the main control CPU controller is respectively bidirectionally connected to the remote wireless 4G communication system and the GPS timing system;

The power conversion module is connected to the wind-solar complementary power supply system, and is connected to the acceleration sensor, the analog signal processor, the analog-to-digital signal converter, the main control CPU controller, the remote wireless 4G communication system and the GPS timing system respectively;

The acceleration sensor is a high-precision force balance acceleration sensor; the high-precision force balance acceleration sensor is an ultra-low frequency acceleration sensor, its performance frequency response starts from 0Hz, and its output terminal is connected to an analog signal processor;

The analog signal processor adjusts the full-scale ±5V vibration signal obtained by the acceleration sensor into a signal that meets the requirements of the analog-to-digital signal converter;

The said analog-to-digital signal converter realizes the conversion from analog signal to digital signal through the logic control of the peripheral standard configuration circuit and the main control CPU controller;

The main control CPU controller realizes acceleration sensor data acquisition, data calculation management, data storage and seismic record file management, seismic algorithm and control logic, remote wireless data communication and data interaction with remote monitoring software;

The GPS time service system realizes that the entire device works according to UTC time and meets the general requirements of international seismic recording time;

The remote wireless 4G communication system uses a wireless 4G transparent data communication module to realize remote wireless data communication.

Further, the acceleration sensor is FBA12 high precision force balance acceleration sensor.

Further, the circuit of the entire device adopts a multilayer circuit board design.

Further, the entire device uses low-power general-purpose industrial-grade electronic components.

Further, the entire device adopts virtual instrument electronic circuit design technology.

Further, the main control CPU controller adopts the ARM-STM32 chip based on the 32-bit Cortex-M3 microcontroller core of the ARMv7 architecture.

Further, the said remote wireless 4G communication system adopts industrial-grade WH-LTE-7S4 wireless 4G module.

Compared with the prior art, the present invention has the following beneficial effects:

1. The main control CPU controller of the present invention adopts its brand-new MCU-STM32 based on ARMv7 architecture-based 32-bit Cortex-M3 microcontroller core launched by ARM. With its diversified product line, high cost performance, and easy-to-use library development method, STM32 quickly stood out among many Cortex-M3MCUs and became the most shining new star. This system selects STM32429 with better performance in the STM32 family for system control and data calculation. The structure data collected by the system is directly used for seismic data algorithm calculation, data storage, remote communication and other tasks through the powerful data signal processing and counting function of STM32.

2. The present invention uses the mobile 4G communication technology currently used in a large area for data communication. The current mobile 4G technology communication is stable and reliable, has a wide coverage area, ensures the stability and safety of system communication, and can realize a large-scale monitoring and deployment of a strong earthquake system. The use of wireless communication technology eliminates the need for wiring for system monitoring and reduces many links in the on-site monitoring process, thereby ensuring the reliability of strong earthquake monitoring.

The invention selects a mature industrial-grade WH-LTE-7S4 wireless 4G module for wireless communication. The maturity and stability of the WH-LTE-7S4 wireless 4G module ensures that the communication of the entire system is stable and reliable, and realizes the requirements of large-area real-time data communication. The present invention can realize network monitoring of strong earthquakes through the monitoring center, conduct data interaction with multiple strong earthquake monitoring systems, and can realize large-area large-scale strong earthquake monitoring.

3. The acceleration sensor of the present invention is a high-precision acceleration sensor selected in order to obtain complete and effective strong earthquake monitoring data. The sensor itself is a unidirectional broadband acceleration sensor that adopts force balance electronic feedback and mechatronics design, The unidirectional vibration acceleration is truly converted into a voltage signal output to realize various low-frequency and ultra-low frequency vibration measurement. It has high accuracy, high sensitivity output, high dynamic range, good linearity, and low frequency starts from 0Hz (the characteristics of seismic signal requirements) Use an acceleration sensor with a 0-frequency start as a shock pickup), which has a flat frequency response, a linear change in phase, good technical parameter consistency, stable and reliable performance, low power consumption, and small size.

4. The circuit of the present invention adopts a multi-layer circuit board design. The multi-layer circuit board has high assembly density, small size and light weight. Due to the high assembly density, the connection between various components (including components) is reduced, and the reliability is increased; The number of wiring layers increases design flexibility; it can form a circuit with a certain impedance; it can form a high-speed transmission circuit; it can be equipped with a circuit, magnetic circuit shielding layer, and a metal core heat dissipation layer to meet the needs of shielding and heat dissipation; debugging Simple and highly reliable.

5. The present invention uses general industrial-grade electronic components with low power consumption. Low-power electronic devices can reduce the power requirements of the system, and can reduce the requirements for system heating and problems; industrial-grade electronic devices can increase the actual working temperature space of the system and improve system stability.

6. The present invention adopts virtual instrument electronic circuit design technology. Virtual instrument technology (Virtual instrument) is to use high-performance modular hardware combined with efficient and flexible software to complete various testing, measurement and automation applications. Compared with other technologies, virtual instrument technology has four major advantages: high performance, strong scalability, time saving, and seamless integration.

Description of the drawings

Figure 1 is a schematic diagram of the composition of the present invention.

Figure 2 is a schematic diagram of the acceleration sensor and analog signal processor circuit of the present invention.

Figure 3 is a schematic diagram of the analog-to-digital signal converter, the main CPU controller core board (SD card memory) and the GPS timing system circuit.

Figure 4 is a schematic diagram of a remote wireless 4G communication module, a controllable power supply chip and a power conversion module circuit.

detailed description

The present invention will be further explained below in conjunction with the drawings. As shown in Figure 1, a ground motion record collection and storage system for 4G network communication includes acceleration sensors, analog signal processors, analog-to-digital signal converters, master CPU controllers, remote wireless 4G communication systems, and GPS timing systems , Power conversion module and wind-solar hybrid power supply system.

As shown in Figure 2, further, the analog signal processor includes operational amplifiers U1 and U2; the output terminal of the acceleration sensor is connected to pin 2 of the operational amplifier U1 through a resistor R1, while the output terminal of the acceleration sensor is connected to a protection tube D1 , The discharge voltage amplitude limit protection, at the same time, the 2 feet and 6 feet of the operational amplifier U1 are connected in series with the resistor R3 and the multi-turn high-precision potentiometer T1, and the 3 feet are connected to the ground resistor R2. The operational amplifier U1, the resistor R3, The potentiometer T1 and the resistor R2 constitute a -0.5 times inverting amplifier. Since the full-scale output signal of the acceleration sensor is ±5V, the full-scale input signal of the analog-to-digital signal converter is ±2.5V, and the full-scale signal matching is realized by the operational amplifier U1. The precision multi-turn potentiometer T1 is used to adjust the amplification factor of the non-inverting amplifier circuit of the operational amplifier U1 to ensure the requirements of measurement accuracy;

The 4 pin of the operational amplifier U1 is the negative power supply, and the 7 pin is the positive power supply; the +12V power supply is connected to the 7 pin of the operational amplifier U1 through the resistor R4, and the filter capacitor C2 is connected to the ground. The resistor R4 and the filter capacitor C2 form an RC power filter network. Ensure that the power supply of the operational amplifier U1 is stable; the -12V power supply is connected to the 4 pin of the operational amplifier U1 through the resistor R5 and the filter capacitor C1 is connected to the ground. The resistor R5 and the filter capacitor C1 form an RC power filter network to ensure the power supply of the operational amplifier U1 ；

Pin 1 and Pin 8 of the operational amplifier U1 are connected to the precision multi-turn potentiometer T2 to adjust the zero offset of the pre-signal processing circuit;

The signal output of the operational amplifier U1 is connected to pin 2 of the operational amplifier U2 through a resistor R1, and the second connection of the operational amplifier U2 is connected to the output pin 6 through a resistor R1 of the same resistance. The operational amplifier U2 and two resistors R1 constitute- 1 times the reverse amplifier, the 3 pin of the operational amplifier U2 is connected to the resistance R2 to the ground. Operational amplifiers U1 and U2 realize two-stage reverse amplification of signals, so that the polarity of the acceleration sensor signal is restored to the original acceleration sensor signal.

The 4 pin of the operational amplifier U2 is the negative power supply, and the 7 pin is the positive power supply; the +12V power supply is connected to the 7 pin of the operational amplifier U2 through the resistor R4, and the filter capacitor C2 is connected to the ground at the same time. The resistor R4 and the filter capacitor C2 form an RC power filter network , To ensure that the power supply of the operational amplifier U2 is stable; the -12V power supply is connected to the 4 pin of the operational amplifier U2 through the resistor R5, and the filter capacitor C1 is connected to the ground. The resistor R5 and the filter capacitor C1 form an RC power filter network to ensure the power supply of the operational amplifier U1 stable.

As shown in Figure 3, there are three analog signal processors U3, corresponding to the acceleration sensors in the three directions; the signals of the three-direction acceleration sensor are processed by the analog signal processor through the output 6 pins of the operational amplifier U2 and directly connected with the analog and digital signals. The AIN1, AIN2, and AIN3 of the signal converter U3 are connected. The analog-to-digital signal converter U3 is a 24-bit high-precision, high-speed, low-power analog-to-digital signal converter, which is applied to a 2/3-channel analog front end for low-frequency measurement; the device accepts low-level signals directly from the acceleration sensor Input signal, and then generate serial digital output; use sigma-delta conversion technology to achieve 24-bit lossless code performance; selected input signal is sent to a dedicated front end with programmable gain based on analog modulator, analog-to-digital signal converter The digital filter in the chip processes the output signal of the modulator, and the cut-off point and output update rate of the filter are adjusted through the control register in the analog-to-digital signal converter chip; the serial interface of the analog-to-digital signal converter chip is configured as a three-wire interface; single +5V Power supply, the input voltage range is ±2.5V.

Pins 2 and 3 of the analog-to-digital signal converter U3 are connected to the crystal oscillator Y1, and the crystal oscillator Y1 is used as the main clock of the analog-to-digital signal converter U3. At the same time, pins 2 and 3 are connected to the grounding capacitor C15. When the frequency of the master clock is 2.4576MHz, the programming range of the first notch frequency is 50Hz～500Hz, and the range of -3dB frequency is 13.1Hz～131Hz. According to the characteristics of seismic data, the effective sampling frequency needs to be 100Hz, which can fully meet the needs of seismic monitoring through software cooperation.

The analog signal range of the analog-to-digital signal converter U3 is ±2.5V, and a reference voltage is required. The reference voltage regulator chip U4 provides a 1.25V reference voltage output. The power input and 1.25V output ends of the reference voltage regulator chip U4 use capacitors C3, C4 is decoupling to ground. The reference voltage regulator chip U4 is a high-precision, low-power voltage reference in a tiny 3-pin SOT-23 package. The analog-to-digital signal converter U3 is powered by 5V, and the main control CPU controller U5 is powered by 3.3V. There is a level mismatch between them, and the communication between them requires a level conversion chip. Three U12s are used for level conversion, two of which use 5V power supply. The main control CPU controller performs leveling on the 3.3V level control signals RESET, DIN, CS, and SCLK of the analog-to-digital signal converter through 5V power supply U12 After the conversion, it is sent to the analog-to-digital signal converter U4; the 3.3V level status signal and the converted digital signal that the analog-to-digital signal converter U4 sends to the main control CPU controller are level-converted through the 3.3V power supply U12 and then sent to Main control CPU controller. The power supply of level conversion chip U12 uses capacitor C3 to ground for decoupling operation.

As shown in Figure 3, the main control CPU controller includes a CPU chip U5, a GPS timing system U6, and an SD card data memory U9.

The CPU core board module U5 controls the work of all logic function chips, and simultaneously manages data algorithms and data storage. The CPU core board module U5 has its own debugging interface, and users do not need to consider simulation debugging and program download. The core of the main control chip STM32f429 of the CPU core board module U5 is ARM with FPU

32-bit Cortex

-M4CPU, implemented in Flash memory zero wait state operation performance of an adaptive real-time ART Accelerator Accelerator ^(TM) i.e., clocked at up to 180MHz, MPU, can be realized up 225DMIPS / 1.25DMIPS performance / MHz (Dhrystone 2.1), the DSP instruction set having ; Its memory is up to 2MB Flash, organized into two areas, can read and write synchronously, contains up to 256+4KB of SRAM, including 64-KB of CCM (core coupled memory) data RAM, with up to 32-bit data bus flexibility External memory controller: SRAM, PSRAM, SDRAM/LPSDRSDRAM, Compact Flash/NOR/NAND memory, etc. Its powerful basic performance fully meets the design requirements of the present invention.

The reset circuit of the CPU core board module U5 is composed of R10 and C11 and is connected to the NRST end of U5. One end of R10 is connected to 3.3V, and the other end of C11 is grounded, and the power is pulled low to reset. BOOT loading mode select terminal J1, use short circuit to select 3.3V or ground connection, BOOT0 and BOOT1 are loaded with current-limiting resistor R10, program loading mode uses short circuit setting according to actual debugging and full-speed operation. It may be affected during circuit debugging. When the program works abnormally, use the short circuit to connect to 3.3V or ground, so that the system can resume work.

The power conversion chip U8 completes the conversion of +5V power supply into +3.3V power supply for the main control CPU chip U5 and data storage U9; the input +5V power supply of the power conversion chip U8 and the output 3.3V power supply use capacitors C8 and C3. Decoupling filtering ensures that the input voltage of the power conversion chip U8 is stable.

The data storage U9 is an SD card, which uses the SD card for seismic data storage. Since the SD card has a large storage capacity, 2G, 4G or larger storage space can be selected according to the situation to achieve a large amount of seismic data storage. Similar to the Wenchuan earthquake in Sichuan, thousands of aftershocks can be fully recorded without the need to replace storage media, so as to achieve a complete probability of an earthquake; SD cards are widely used in portable devices and are important for embedded devices The storage data component of the SD card can be directly read and written, or written to the file system, and then use the file system read and write functions, use the file system operation, and perform the data read and write operations at the bottom of the SD card, directly use the SDIO structure function to the SD Card for reading and writing. SD card uses 3.3V power supply provided by power conversion chip U8, data storage U9 power supply terminal uses capacitor C3 for power decoupling; data storage U9 pin numbers 1, 2, 3, 7, 8 are respectively connected to a 3.3V pull-up resistor R10 is connected to the CPU core board module U5 pin number 49, 50, 51, 53, 54 respectively, and the data memory U9 pin number 5 is connected to the CPU core board module U5 pin number 52; data memory U9's pin numbers 5, 10, 11, 12, 13 are grounded, pin 4 is connected to 3.3V, and other pins are not connected.

The remote wireless 4G communication system includes a wireless 4G communication interface chip U10 and a power conversion chip U11. The specific circuit is shown in FIG. 4. Figure 4 also has a power conversion module that provides operating power for the GPS timing system and CPU chip U5. The power conversion module is completed by DS1 and DS2. The remote wireless data communication chip U10 is a functional module for realizing wireless communication. It is a small and feature-rich wireless connection product based on 4G communication. It is suitable for China Mobile, China Unicom, Telecom 4G and China Mobile, China Unicom 3G and 2G networks System: With "transparent transmission" as the functional core, it is highly easy to use and adopts a double-row pin package form, so users can easily and quickly integrate into their own systems. The module software has complete functions and covers most of the conventional application scenarios. Users can realize the two-way data transparent transmission from the serial port to the network only by simple settings. And it supports custom registration package, heartbeat package and other functions, supports 2-way Socket connection, supports HTTP and other protocol communications. It has the characteristics of high speed and low latency. The remote wireless data communication chip U10 uses 3.8V power supply, and the power conversion chip U11 realizes +5V voltage conversion output +3.8V power supply;

The power conversion chip U11 is a high-precision, high-stability, and voltage-adjustable regulated power conversion chip. It adjusts the resistance of the resistors R11 and R12 to achieve 3.8V output. The 1, 2 pins of the remote wireless data communication chip U10 are connected to +5V , Pin 3 is grounded, pin 4 is output, and pin 4 is connected to resistor R11, and the other end of resistor R11 is connected to pin 5 and resistor R12 to the ground. Voltage output formula Vout=1.24*[1+(R11/R12)], adjust the resistance of resistors R11 and R12 to achieve 3.8V power output. The typical voltage of the remote wireless data communication chip U10 is 3.8V, the power supply range is 3.4-4.2V, and the peak power supply current is 2.5A. When the remote wireless data communication chip uses 3.8V power supply, 16 pins are used to provide 3.8V to the remote wireless data communication chip Working voltage, the 3.8V power supply voltage output by the power conversion chip U11 is sent to the 16 pin of the remote wireless data communication chip U10 after the placed large capacitor network and bypass capacitor. The large capacitor network prevents the external power supply from voltage drop during the pulse current period , Connect the bypass capacitor to stabilize the work of the module. The remote wireless data communication chip U10 provides a SIM card interface that meets the ISO 7816-3 standard, automatically recognizes 3.0V and 1.8V SIM cards, and provides a 3.25MHz clock signal to the USIM card in standard mode; in low power consumption mode , Provide 1.08MHz clock signal to USIM card; support clock shutdown mode; support speed enhanced USIM card by adjusting the baud rate parameter; support DMA transmission/reception; support automatic power saving mode in logout mode; in RX mode The remote wireless data communication chip U10 has integrated the SIM card function and can be used directly; the four pins of the chip U10’s pin numbers 20, 21, 22 and 23 are directly connected to the SIM card (need to be used on the circuit board). SIM card holder), the four pins need to be connected to the ground with a TVS (transient diode) protection diode. Since the USIM card is often inserted or pulled out, the human body is charged with static electricity. In order to prevent static electricity from affecting the USIM card and chip If damage is caused, a TVS tube needs to be added for electrostatic protection as an ESD anti-static measure; at the same time, the capacitor C14 should be connected to the ground, and the 20 pin should be connected to the ground C3 to filter out the interference of radio frequency signals; the pin of the remote wireless data communication chip U10 No. 9 is the working status indication signal sent to the CPU core board module U5 pin 9. Because the remote wireless data communication chip U10 and the CPU core board module U5 do not match the power supply level, you need to use the transistor Q1 resistor R13 and the power supply 3.3V to achieve 3.8V power. The flat signal is converted into a 3.3V level signal, and the CPU core board module U5 obtains the working status of the remote wireless data communication chip U10; the 6 and 7 pins of the remote wireless data communication chip U10 default to 3.3V level, which can be directly connected to the CPU core board module U5 is connected to pins 92 and 24 of the CPU core board module U5; pins 11 and 12 of the remote wireless data communication chip U10 are grounded, and other pins are left unconnected.

The GPS time service system U6 is based on the international general seismic recording requirements, and the system time adopts the world unified time for seismic recording. The SKG17A used in the GPS timing system U6 is a complete GPS module with extremely high sensitivity and precision, ultra-low power consumption and a very small package; GPS signals obtain information from the antenna, as well as complete serial data information with position, speed and time information. In the serial data, it is based on a high-performance monolithic structure, with a sensitivity of -165dBm, and a timing accuracy of 10nS, which fully meets the requirements of high-precision and field environments required by the seismic monitoring system. The positioning coverage extends to cities, valleys and In dense forests and other environments, it is possible to obtain GPS information; the small package and low power consumption make it easy for the module to be applied to the system and integrated into portable devices. The GPS timing system U6 uses 3.3V power supply, and the controllable power chip U7 is used alone for power conversion. The power input pin 1 +5V of the controllable power chip U7 uses C3 and C6 for decoupling operation, and the output pin 5 uses capacitor C6 for decoupling operation; the power input pin 4 of the controllable power chip U7 is connected to the ground capacitor C7, Pin 2 is directly grounded; Pin 3 of the power input end of the controllable power supply chip U7 is the power conversion control end, which is directly connected to pin 25 of the CPU core board module U5. If you consider not using GPS, you can turn off the power supply of the GPS module to reduce power. Consumption. The pin numbers 3 and 4 of the controllable power supply chip U7 are serial data interfaces, respectively connected to the resistance R6, the resistance output pair is 3.3V connected to the resistance R7 to pull up, the signal output and input two lines are respectively connected to the 7 and 8 of the CPU core board module U5 The pins are connected for serial communication; the 3.3V power output from the controllable power supply chip U7 is sent to the GPS timing system U6 power processing circuit. L1, C3, C4 form the power supply LC filter circuit, and the power supply decoupling operation makes the GPS power supply The quality has been improved again, making the data obtained by the GPS module more stable and reliable; the pin number 11 of the controllable power supply chip U7 is connected to the ground capacitor C5 and the resistor R8, and the output is connected to the battery BT1. BT1 can increase the backup power for the GPS module. When there is a power failure in the main power supply system, the backup power supply starts to work, which can continuously achieve stable data output; pin 16 of the controllable power supply chip U7 is the antenna pin, and the antenna needs to use a 50ohm low-noise cable to connect to the outdoor receiving antenna , According to the actual situation, you can choose an active antenna. GPS timing system U6 uses an active antenna to improve signal quality. Pin 19 can provide power for the active antenna. The power output uses capacitor C3 for decoupling operation; controllable power supply chip U7 Pin numbers 7, 13, 14, 15, 17 are grounded, and other pins are not connected.

The power conversion module and power supply system include wind-solar hybrid power supply system, +12V battery, DC/DC modules DS1 and DS2. The +12V battery input is connected to power inductor L2 through decoupling filter capacitors C3 and C11, and power inductor L2 outputs The terminal is again connected to the input terminals of the DC/DC module DS1 and DS2 through the decoupling filter capacitors C3 and C11; the DC/DC module DS2 is converted into a +5V single power output, and the output power is output to each chip through the decoupling filter capacitors C3 and C4 Power supply; DC/DC module DS1 converts +12V power supply into +/-12V dual power output, and the output +/-12V power directly supplies power to operational amplifiers U1 and U2, which requires two sets of C3 and C11 decoupling operations. Taking into account the problem of complete power failure when working in a harsh environment, especially when a destructive earthquake occurs, a wind-solar hybrid power supply system is designed to provide power for the entire device. Under normal circumstances, solar energy is used to charge and store the battery. Wind power is started to charge the battery in rainy days. The complementary use of solar and wind energy can charge the battery without interruption, so that the seismograph system can work continuously and stably. .

The remote wireless 4G communication system includes a wireless 4G communication interface chip U10 and a power conversion chip U11. The specific circuit is shown in FIG. 4. The specific circuit shown in Figure 4 also has a voltage stabilizing conversion circuit that provides operating power for the GPS timing system and the CPU chip U5. The power conversion module is completed by DS1 and DS2.

The acceleration sensor of the present invention selects the FBA12 high-precision force balance acceleration sensor based on the principle of earthquake monitoring force balance. According to the structure test experience, the structure monitoring acceleration sensor requires high precision, high dynamic range, ultra-low frequency and other characteristics. The FBA12 high-precision force balance acceleration sensor is A unidirectional broadband acceleration sensor adopts force balance electronic feedback and mechatronics design to truly convert unidirectional vibration acceleration into voltage signal output, and realize various low-frequency and ultra-low frequency vibration measurement. FBA12 high-precision force balance acceleration sensor is a new generation of high-precision sensor with high accuracy, high sensitivity output, high dynamic range, good linearity, low frequency starting from 0Hz, flat frequency response, linear phase change, consistent technical parameters The characteristics of good performance, stable and reliable performance, low power consumption, small size, etc. are very suitable for the present invention.

The CPU chip U5 of the present invention completes the functions of analog-to-digital signal converter logic control, data acquisition, seismic algorithm calculation, seismic data storage, seismic data record file management, remote wireless data communication and the like. Seismic data storage and seismic data record file management should be realized by making full use of the powerful data calculation function of STM32. The realization process of a complete earthquake record is as follows: earthquakes do not occur frequently, the system will be in standby mode when there is no earthquake, and it is just monitoring the collected data. At this time, pre-set parameters are required, generally. Set the trigger mode (including threshold trigger, STA/LTA, STA-LTA), and set the trigger parameter value according to the location of the strong motion instrument (reasonable seismic algorithm, after considering various conditions, the experiment ensures that the valid data is triggered and cannot occur False trigger and miss trigger); At the same time, you need to set the trigger record time. When the trigger occurs, you need to record the pre-trigger record time and the post-trigger record time. This is a complete earthquake record, that is, before and after the trigger occurs. The data contains a lot of seismic structural information, and there should be no incomplete records; at the same time, the problem of remote alarm should be set. When the trigger occurs the first time, the remote alarm mechanism needs to be activated to make various rescues to the earthquake as soon as possible Respond to make an effort. The seismometer system in the standby state monitors the data changes. When the reversal is triggered, the remote alarm will be activated and the recording and storage will be started at the same time. When the trigger occurs during the recording process, it will continue to record until the trigger is over. This limit situation This may result in a large data record file, but the seismic record cannot be incomplete, and a large number of data record files must be managed. The monitoring center can remotely take the data wirelessly, perform necessary analysis, analyze the earthquake situation and structural damage at that time, and provide data basis for reducing secondary damage in earthquake rescue. In addition, working hours are based on GPS time as the standard time.

All the components and connectors of the present invention can be purchased from the electronic market, as shown in Table 1, which is beneficial to greatly reduce the manufacturing cost and improve the performance of the data acquisition system.

Table 1: Components and connectors label list

The present invention is not limited to this embodiment, and any equivalent concept or change within the technical scope disclosed by the present invention is included in the protection scope of the present invention.

Claims (7)

1. A ground motion record collection and storage system for 4G network communication, which is characterized in that it includes an acceleration sensor, an analog signal processor, an analog-to-digital signal converter, a main control CPU controller, a remote wireless 4G communication system, a GPS timing system, and a power supply. Conversion module and wind-solar hybrid power supply system;

   There are three acceleration sensors, namely, the north-south direction acceleration sensor, the east-west direction acceleration sensor and the vertical direction acceleration sensor. The north-south direction acceleration sensor, the east-west direction acceleration sensor and the vertical direction acceleration sensor respectively pass through their respective analog signal processors. Connected to the analog-to-digital signal converter; the analog-to-digital signal converter is bidirectionally connected to the main control CPU controller; the main control CPU controller is respectively bidirectionally connected to the remote wireless 4G communication system and the GPS timing system;

   The power conversion module is connected to the wind-solar complementary power supply system, and is connected to the acceleration sensor, the analog signal processor, the analog-to-digital signal converter, the main control CPU controller, the remote wireless 4G communication system and the GPS timing system respectively;

   The acceleration sensor is a high-precision force balance acceleration sensor; the high-precision force balance acceleration sensor is an ultra-low frequency acceleration sensor, its performance frequency response starts from 0Hz, and its output terminal is connected to an analog signal processor;

   The analog signal processor adjusts the full-scale ±5V vibration signal obtained by the acceleration sensor into a signal that meets the requirements of the analog-to-digital signal converter;

   The said analog-to-digital signal converter realizes the conversion from analog signal to digital signal through the logic control of the peripheral standard configuration circuit and the main control CPU controller;

   The main control CPU controller realizes acceleration sensor data acquisition, data calculation management, data storage and seismic record file management, seismic algorithm and control logic, remote wireless data communication and data interaction with remote monitoring software;

   The GPS time service system realizes that the entire device works according to UTC time and meets the general requirements of international seismic recording time;

   The remote wireless 4G communication system uses a wireless 4G transparent data communication module to realize remote wireless data communication.
2. A 4G network communication ground motion record collection and storage system according to claim 1, wherein the acceleration sensor is an FBA12 high-precision force balance acceleration sensor.
3. The ground motion record collection and storage system for 4G network communication according to claim 1, wherein the circuit of the entire device adopts a multilayer circuit board design.
4. The ground motion record collection and storage system for 4G network communication according to claim 1, characterized in that the whole device uses low-power general-purpose industrial-grade electronic components.
5. The ground motion record collection and storage system for 4G network communication according to claim 1, wherein the whole device adopts virtual instrument electronic circuit design technology.
6. The ground motion record collection and storage system for 4G network communication according to claim 1, wherein the main control CPU controller adopts ARM's 32-bit Cortex-M3 microcontroller core based on ARMv7 architecture MCU-STM32 chip.
7. The ground motion record collection and storage system for 4G network communication according to claim 1, wherein the remote wireless 4G communication system uses an industrial-grade WH-LTE-7S4 wireless 4G module.

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