CN114495472A - ZigBee-based Beidou time service wireless sensor acquisition system - Google Patents
ZigBee-based Beidou time service wireless sensor acquisition system Download PDFInfo
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- CN114495472A CN114495472A CN202111539213.8A CN202111539213A CN114495472A CN 114495472 A CN114495472 A CN 114495472A CN 202111539213 A CN202111539213 A CN 202111539213A CN 114495472 A CN114495472 A CN 114495472A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Abstract
The invention discloses a ZigBee-based Beidou time service wireless sensor acquisition system, wherein different sensors send sensor detection data to an MCU (microprogrammed control Unit) control module; each sensor node operates independently, external control, external power supply and a constant-temperature working environment are not needed, a system can be efficiently arranged, data interference does not exist between the nodes, and the nodes are easy to maintain and repair; the data acquisition system adopts 3.8V explosion-proof lithium battery for power supply, and the communication system in the cabin can not be interfered. The sensor cable laying of the dynamic data acquisition system can be reduced by 90%, the construction period and labor cost can be reduced by 80%, the system cost can be reduced by 40%, and the system volume can be reduced by 40%. The synchronous acquisition of the sensor data at the same time is effectively ensured, and the time sequence precision of data acquisition is ensured.
Description
Technical Field
The invention belongs to the technical field of wireless sensors, and particularly relates to a Beidou time service wireless sensor acquisition system based on ZigBee.
Background
Aiming at measuring pressure, temperature, vibration and overload of each section of the rocket, the rocket needs to be directly in wireless communication with a wireless data receiving controller, and the rocket needs to meet the requirements of miniaturization and product design. At present, wireless sensors used in domestic markets are mostly based on WiFi, Bluetooth and the like, the sensors cannot achieve low power consumption and long-distance transmission, and the synchronization, time slot allocation and the like cannot meet the requirements of synchronous preprocessing, collecting and sending of a large amount of data in a rocket cabin.
In the current scheme of dynamic data acquisition, most of the dynamic data acquisition and preprocessing are realized by using optical fibers or distributed sensors and data acquisition terminals, so that a large number of cables, data acquisition terminals, networks, a large number of cable protection pipes and the like need to be laid on site, and the dense arrangement of the wire networks causes great interference and is not beneficial to high-precision data acquisition; and the equipment installation is long in time consumption, high in cost, difficult in later maintenance, incapable of quickly positioning and replacing faults and incapable of ensuring data acquisition precision.
Disclosure of Invention
In view of the above, the invention aims to provide a ZigBee-based Beidou time service wireless sensor acquisition system, wherein each sensor node works independently, and the system is easy to maintain, does not need to lay a large number of cables, and meets the requirements of low-power consumption synchronous acquisition and high precision of installation environment in a cabin and sensor data.
A Beidou time service wireless sensor acquisition system based on ZigBee comprises a detection unit, an MCU control unit and a wireless control unit; the detection unit comprises a sensor, a signal conditioning module, a data acquisition module and a storage module; the MCU control unit comprises a CPLD time sequence control module and a singlechip logic control module; the sensor is used for acquiring external environment monitoring data;
the signal conditioning module is used for amplifying weak signals detected by the sensor and performing shaping filtering interference on current and voltage signals;
the data acquisition module is used for carrying out analog-to-digital conversion on the data processed by the signal conditioning module to obtain sensing data;
the storage module comprises an FIFO storage part and a FLASH storage part, and the FIFO storage part is used for sensing data when the system is in a circulating time delay state; the cache FLASH memory is used for storing key sensing data;
the CPLD timing control module performs time synchronization control on the signal conditioning module, the data acquisition module, the storage module and the singlechip logic control module according to an externally input Beidou time service signal;
the single chip microcomputer logic control module interprets various sensing data acquired by the data acquisition module, sends a trigger signal to the storage module when the data value reaches a set trigger value, reads the sensing data with a set time length before the trigger time and the sensing data with the set time length after the trigger time in the FIFO storage part, and sends the sensing data to the wireless control unit through a Zigbee wireless network or stores the sensing data as key sensing data to a cache FLASH memory of the storage module.
Further, the system also comprises an explosion-proof lithium battery and a power management module; and the power supply module is used for carrying out voltage stabilization treatment on the output voltage of the explosion-proof battery and then supplying power to the outside.
Further, the signal conditioning module obtains temperature sensing data by a cold end compensation method, specifically: and measuring the actual temperature Ts of the cold end by using a digital temperature sensor element, and measuring the hot end temperature T1 corresponding to the electromotive force signal at the room temperature of the hot end of the thermocouple to obtain the measured temperature T: t — T1+ k · Ts, where k denotes a compensation coefficient.
Furthermore, the storage module further comprises a ferroelectric storage part, wherein the ferroelectric storage part divides a parameter instruction storage area and a key data storage area, and the parameter instruction storage area is used for storing the node IP address, the port number and the network management data.
Further, the wireless control unit comprises a display module for data viewing, data derivation, setting of trigger level values, and setting of IP ports.
Preferably, the display module further performs power-on and power-off control, system parameter configuration, trigger control and memory data reading and erasing on the acquisition system.
Preferably, the single chip microcomputer logic control module generates the sensing data into a data packet in an ASCII character form, and the data packet is generated by sequencing the sensing data including data acquisition time, sensor number, current sensing data and CRC check code.
Preferably, the detection unit and the MCU control unit are encapsulated in a protective aluminum shell, and the protective shell is provided with a power supply interface and an external antenna interface.
The invention has the following beneficial effects:
the invention discloses a ZigBee-based Beidou time service wireless sensor acquisition system, wherein different sensors send sensor detection data to an MCU (microprogrammed control Unit) control module; the Beidou time service module sends a 1PPS pulse signal to a CPLD timing control part in the MCU control module after the system is started to serve as a counting time reference; the trigger module is used for sending a trigger signal to the MCU control module; the power supply module is used for supplying power to each module of the system; the Zigbee wireless control module is connected with the MCU control module, and sends the trigger information and the detection data received by the MCU control module to the wireless controller in real time, and meanwhile, the acquisition system can be controlled up and down, system parameters are configured, trigger level values are set, data of a memory are read and erased, and data curves are drawn through a display screen of the wireless control module.
Each sensor node operates independently, external control, external power supply and a constant-temperature working environment are not needed, a system can be efficiently arranged, data interference does not exist between the nodes, and the sensor nodes are easy to maintain and repair. The data acquisition system adopts 3.8V explosion-proof lithium battery for power supply, and the communication system in the cabin can not be interfered. The sensor cable laying of the dynamic data acquisition system can be reduced by 90%, the construction period and labor cost can be reduced by 80%, the system cost can be reduced by 40%, and the system volume can be reduced by 40%. The synchronous acquisition of the sensor data at the same time is effectively ensured, and the time sequence precision of data acquisition is ensured.
Drawings
FIG. 1 is a frame diagram of a Zigbee-based Beidou time service wireless sensor acquisition system of the present invention;
fig. 2 is a flowchart of an acquisition method of a Zigbee-based Beidou time service wireless sensor acquisition system of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in the attached drawing 1, the Beidou time service wireless sensor acquisition system based on Zigbee comprises a detection unit, an MCU control unit and a wireless control unit; the detection unit comprises an explosion-proof lithium battery, a power supply management module, a sensor, a signal conditioning module, a data acquisition module and a storage module; the MCU control unit comprises a CPLD time sequence control module and a singlechip logic control module; the wireless control unit comprises a Zigbee wireless control node and a display module;
the sensor is used for acquiring external environment monitoring data including sensing data such as pressure, temperature, overload, vibration and the like;
the power supply module is used for supplying power to each module after voltage stabilization processing is carried out on the output voltage of the explosion-proof battery;
the signal conditioning module is used for amplifying the weak signals detected by the sensor and carrying out shaping, filtering and interference on the current and voltage signals; wherein, the signal conditioning module obtains temperature sensing data through the cold junction compensation method, specifically is: and (3) measuring the actual temperature Ts of the cold end by using a digital temperature sensor element, and measuring the hot end temperature T1 (obtained by checking a score table) corresponding to the electromotive force signal at the room temperature of the hot end of the thermocouple to obtain the measured temperature T: t — T1+ k · Ts, where k denotes a compensation coefficient.
The data acquisition module is used for carrying out analog-to-digital conversion on the data processed by the signal conditioning module, and obtaining sensing data through 24-bit ADC conversion.
The storage module comprises a ferroelectric storage part, an FIFO storage part and a FLASH storage part, wherein the ferroelectric storage part divides a parameter instruction storage area and a key data storage area, and the parameter instruction storage area is used for storing the IP address and the port number of a node and network management data and is used for parameter verification and repair; the FIFO storage part is used for sensing data when the system is in a cyclic delay state; the cache FLASH memory is used for storing key sensing data.
The CPLD time sequence control module performs time synchronization control on the signal conditioning module, the data acquisition module, the storage module and the singlechip logic control module according to an externally input Beidou time service signal (1PPS pulse signal);
as shown in fig. 2, the single chip logic control module interprets various sensing data obtained by the data acquisition module, and when the data value reaches a set trigger value, sends a trigger signal to the storage module, reads the sensing data with a set duration before the trigger time and the sensing data with a set duration after the trigger time in the FIFO storage portion, and sends the sensing data to the wireless control unit through the Zigbee wireless network, or stores the sensing data as key sensing data in the cache FLASH memory of the storage module.
The sensor data are generated into a data packet in an ASCII character form, and the data packet is generated by sequencing, wherein the data packet comprises data acquisition time, a sensor number, current sensor data and a CRC (cyclic redundancy check) code.
The Zigbee wireless control node of the wireless control unit is connected to the MCU through the ZigBee wireless network, and a user can perform operations such as data checking, data exporting, trigger level value setting, IP port setting and the like through the display module. The acquisition system can be controlled up and down, system parameters can be configured, trigger control and memory data reading and erasing can be carried out through the display module.
The detection unit and the MCU control unit are encapsulated in the protective aluminum shell, and the protective shell is provided with a power supply interface and an external antenna interface.
In a specific embodiment, the system further comprises a ZigBee wireless control module which is connected with the MCU control module, and transmits the trigger information received by the MCU control module to the wireless controller in real time, and meanwhile, the acquisition system can be controlled up and down, system parameters can be configured, trigger control and memory data reading and erasing can be carried out through a display module of the wireless controller.
The embodiment also discloses a Zigbee-based acquisition method of the Beidou time service wireless sensor, which comprises the following steps:
when the detection value does not reach the set trigger value, the trigger module does not trigger, all modules are in a waiting state at the moment, the system is in a circulating delay state and is continuously stored to FIFO, and the detection operation is executed in a given period; when the detection value reaches a set trigger value, the trigger module sends a trigger signal to obtain partial data before the trigger moment of the sensor and key data after triggering from the FIFO to prevent data loss, and the detection data generates a data packet to be uploaded to the controller or stored in the storage module.
In a specific embodiment, sensor detection data in a Zigbee-based Beidou time service wireless sensor acquisition system is preprocessed after signal conversion to generate a data packet, and the data packet is sent to a controller through a wireless network; the data preprocessing comprises signal filtering processing, and the wireless network refers to Zigbee wireless communication; the controller terminal is connected to the MCU control module through ZigBee, and a user can perform operations such as data checking, data exporting, trigger level value setting, IP port setting and the like through the controller.
In a specific embodiment, the data packets are generated by sequencing in an ASCII character format and include data acquisition time, sensor number, current detection data, and CRC check code.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A Beidou time service wireless sensor acquisition system based on ZigBee is characterized by comprising a detection unit, an MCU control unit and a wireless control unit; the detection unit comprises a sensor, a signal conditioning module, a data acquisition module and a storage module; the MCU control unit comprises a CPLD time sequence control module and a singlechip logic control module; the sensor is used for acquiring external environment monitoring data;
the signal conditioning module is used for amplifying weak signals detected by the sensor and performing shaping filtering interference on current and voltage signals;
the data acquisition module is used for carrying out analog-to-digital conversion on the data processed by the signal conditioning module to obtain sensing data;
the storage module comprises an FIFO storage part and a FLASH storage part, and the FIFO storage part is used for sensing data when the system is in a circulating time delay state; the cache FLASH memory is used for storing key sensing data;
the CPLD timing control module performs time synchronization control on the signal conditioning module, the data acquisition module, the storage module and the singlechip logic control module according to an externally input Beidou time service signal;
the single chip microcomputer logic control module interprets various sensing data acquired by the data acquisition module, sends a trigger signal to the storage module when the data value reaches a set trigger value, reads the sensing data with a set time length before the trigger time and the sensing data with the set time length after the trigger time in the FIFO storage part, and sends the sensing data to the wireless control unit through a Zigbee wireless network or stores the sensing data as key sensing data to a cache FLASH memory of the storage module.
2. The Beidou time service wireless sensor acquisition system based on ZigBee of claim 1 is characterized by further comprising an explosion-proof lithium battery and a power management module; and the power supply module is used for carrying out voltage stabilization treatment on the output voltage of the explosion-proof battery and then supplying power to the outside.
3. The Beidou time service wireless sensor acquisition system based on ZigBee of claim 1 is characterized in that the signal conditioning module obtains temperature sensing data through a cold end compensation method, and specifically comprises: and measuring the actual temperature Ts of the cold end by using a digital temperature sensor element, and measuring the hot end temperature T1 corresponding to the electromotive force signal at the room temperature of the hot end of the thermocouple to obtain the measured temperature T: t — T1+ k · Ts, where k denotes a compensation coefficient.
4. The Beidou time service wireless sensor acquisition system based on ZigBee of claim 1 is characterized in that the storage module further comprises a ferroelectric storage part, the ferroelectric storage part divides a parameter instruction storage area and a key data storage area, wherein the parameter instruction storage area is used for storing node IP addresses, port numbers and network management data.
5. The Beidou time service wireless sensor acquisition system based on ZigBee of claim 1, wherein the wireless control unit comprises a display module for data viewing, data derivation, trigger level value setting and IP port setting.
6. The Beidou time service wireless sensor acquisition system based on ZigBee as claimed in claim 5, wherein the display module further performs power-on and power-off control, system parameter configuration, trigger control and memory data reading and erasing on the acquisition system.
7. The Beidou time service wireless sensor acquisition system based on ZigBee of claim 1, wherein the singlechip logic control module generates the sensing data into data packets in an ASCII character form, and the data packets are generated by sequencing, and comprise data acquisition time, sensor numbers, current sensing data and CRC check codes.
8. The Beidou time service wireless sensor acquisition system based on ZigBee of claim 1 is characterized in that the detection unit and the MCU control unit are encapsulated in a protective aluminum shell, and the protective shell is provided with a power supply interface and an external antenna interface.
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| US20180069745A1 (en) * | 2012-08-07 | 2018-03-08 | Gti International Semiconductor Technology Co., Ltd. | System and method for managing cwsn with gui |
| CN110830949A (en) * | 2020-01-10 | 2020-02-21 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Beidou synchronous high-speed real-time wireless sensor acquisition system and method based on 4G/5G |
| CN111149141A (en) * | 2017-09-04 | 2020-05-12 | Nng软件开发和商业有限责任公司 | Method and apparatus for collecting and using sensor data from a vehicle |
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- 2021-12-15 CN CN202111539213.8A patent/CN114495472A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180069745A1 (en) * | 2012-08-07 | 2018-03-08 | Gti International Semiconductor Technology Co., Ltd. | System and method for managing cwsn with gui |
| CN111149141A (en) * | 2017-09-04 | 2020-05-12 | Nng软件开发和商业有限责任公司 | Method and apparatus for collecting and using sensor data from a vehicle |
| CN110830949A (en) * | 2020-01-10 | 2020-02-21 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Beidou synchronous high-speed real-time wireless sensor acquisition system and method based on 4G/5G |
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