River and lake monitoring and monitoring online management system
Contributed by Tangshan Pingsheng Electronic Technology Development Co., Ltd. 1/1/11 9:20:38
0 Popularity: 34
- Keywords: river and lake monitoring and monitoring online management system
- Abstract: Pingsheng electronic river and lake monitoring and monitoring online management system is suitable for remote monitoring of real-time water and rain conditions of natural rivers, artificial canals, and landscape channels. The online monitoring system of rivers and lakes has played an important role in early warning of floods and floods and avoiding human and economic losses.
Pingsheng electronic river and lake monitoring and monitoring online management system is suitable for remote monitoring of real-time water and rain conditions of natural rivers, artificial canals, landscape rivers, etc. The online monitoring system of rivers and lakes has played an important role in early warning of floods and floods and avoiding human and economic losses.
Data perception: Water level gauge and rain gauge measure the water level and rainfall data on site in real time.
Data reporting: The hydrological telemetry terminal collects the output signals of the water level gauge and rain gage in real time, and reports the monitoring data in accordance with the hydrological communication protocol.
Data transmission: Monitoring data is transmitted to "Provincial / City Hydrological Monitoring and Early Warning Platform" via GPRS, CDMA or Beidou satellite.
Data application: The monitoring and early warning platform displays and stores data of each monitoring point in real time, and analyzes and releases early warning information in a timely manner.
Choice of communication method
◆ When the GPRS or CDMA signal at the monitoring point is good, GPRS / CDMA communication is used.
Take an example of the hydrological monitoring site of a small and medium river in Inner Mongolia:
This place is a plain area. Although the monitoring point is far from the urban area, the nearby GPRS signal quality is very good. Therefore, GPRS was selected as the communication method between the field equipment and the monitoring center.
Note: When using GPRS / CDMA communication, it supports remote camera function.
Installation site display:
◆ When the GPRS / CDMA signal is poor at the monitoring point, GPRS / CDMA + BeiDou satellite dual channel communication is adopted.
Take an example of a small and medium river hydrological monitoring site in Shanxi:
This place is in a remote mountainous area, and the GPRS and CDMA signals near the monitoring point are not very stable. In order to ensure the timely transmission of data, Zui finally chose the dual channel communication mode of GPRS + BeiDou satellite.
GPRS is the main channel and Beidou satellite is the backup channel. GPRS communication is usually used. When the GPRS signal quality is poor, the device automatically switches to Beidou satellite communication. When the GPRS signal quality improves, the device automatically switches back to GPRS communication.
Note: Beidou Satellite Communication currently only supports message transmission, and does not support remote camera function.
Installation site display:
Case sharing: Beidou communication based hydrological monitoring project in Tibet
Background of the project
A Tibetan Hydrological Bureau plans to monitor the water level and rainfall of a reservoir. Three new monitoring stations and a hydrological monitoring system need to be established in the field. However, Tibet has a vast territory, and the new monitoring station is inaccessible. There is no utility power and no mobile phone signal. Deployment is very difficult.
In the face of this situation, Pingsheng provided an overall solution based on Beidou communication and low-power solar power technology, which successfully met the various monitoring needs of the Hydrographic Bureau and provided a stable, efficient, and low-cost for the Hydrographic Bureau. Highly adaptive hydrological monitoring system.
1. System topology diagram
Hydrological monitoring system based on Beidou communication
2. System communication process
A total of 3 hydrological monitoring stations were distributed on the site. The radar water level gauge using RS485 signal was used to collect river water level data, and the rain gauge using single pulse signal was used to collect rainfall data.
Each monitoring station uses one Taipei bucket short message data transmission terminal (hereinafter referred to as Beidou terminal), and the Hydrographic Bureau Monitoring Center uses one Taipei bucket terminal. The RTU in the monitoring station is connected to the Beidou terminal through a serial port, and the collected data is converted into short messages and sent to the Beidou satellite that is working in orbit. After the platform software analyzes the data, complete the data display and other operations.
3. Power supply design of monitoring station
• Solar powered
The monitoring station is powered by solar energy and is equipped with 60W solar panels + 38AH storage batteries. Under rainy and rainy conditions, the entire system can run continuously for more than 15 days.
The battery is installed in the terminal box, eliminating the need for underground installation.
• Low power design
The core RTU of the monitoring station is DATA-6301. The RTU is designed with low power consumption and the real-time online average current is ≤10mA.
Set every five minutes, the DO terminal control relay provides the Beidou terminal with a current of ≥3A at regular intervals, and the VEXT timing output DC12V voltage supplies the radar water level gauge.
Power off after completing one data acquisition and report to minimize the power consumption of the entire system.
4. System functions
5. "Beidou" networking precautions
Frequency limitation : Due to the limitation of Beidou satellite communication bandwidth, the short message communication is currently mainly used for the minute card (military card is the second card), that is, a short message is sent every one minute. However, there are no restrictions on receiving short messages. As long as Beidou short message equipment successfully captures satellite signals, it can be received at any time without frequency restrictions. Therefore, the center only needs a Taipei terminal to connect with multiple stations on the site.
按照北斗协议，短报文字节数最多是78 字节，因此无法支持传输现场图片。 Message Bytes : According to the Beidou protocol, the short message bytes are up to 78 bytes, so it cannot support the transmission of live pictures.
Network access : The use of Beidou short message equipment requires the purchase of a Beidou card as a network access license to enter the Beidou communication network.
北斗短报文系统的卫星在赤道上方静止轨道，在安装北斗终端（即天线）时朝南方向信号最好。 Beidou terminal installation requirements : The satellite of the Beidou short message system is in a stationary orbit above the equator, and the signal is best when facing the south when the Beidou terminal (ie, antenna) is installed. Once the satellite is locked, the signal is always very stable. In addition, the Beidou terminal is required to be as free as possible from the top when in use.
The low-power monitoring system using Beidou Communication is particularly suitable for monitoring scenarios with no signal in the field and difficult power supply, and is widely used in data monitoring fields such as hydrology, water resources, meteorology and environmental protection.
From sensor selection and terminal integration to cloud server rental and platform construction, Pingsheng Electronics provides customers with fast and efficient one-stop supporting services, reducing costs for customers in procurement, design, commissioning and construction.
Since August 2018, the system has been operating steadily, greatly eliminating the high cost of on-site maintenance.
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