CN100428283C - Multi-index field soil moisture content remote observation system with low-power consumption - Google Patents
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Abstract
The disclosed low-consumption multicriteria field soil moisture content remote monitor system comprises: a center station (1) connected with (2) by GSM information exchange center or with (3) by GSM/GPRS/CDMA mobile communication network, at least one monitor station (2), and a data processing center (3) connected with (2) by GSM/GPRS/CDMA mobile communication network. This invention can remote real-time monitor 10-20 criteria with well reliability and low cost.
Description
Technical field:
The present invention relates to a kind of soil moisture content monitoring system, especially a kind of multi-index field soil moisture content remote observation system with low-power consumption.
Background technology:
Soil moisture content is meant the soil water regime in the main root zone according of crops.It is the important evidence of coping with agriculture drought, reasonable allocation of water resources.Soil moisture content and damage caused by a drought monitoring are a public welfare, basic work, can be government's macro-level policy-making scientific basis is provided, and are the guiding agricultural production service; Be an importance of clay fertilizer public welfare that system is engaged in service, also can be the project application, project construction provides scientific basis.At present, the artificial mode of monitoring is on the spot mainly taked in the monitoring of soil moisture content, not only labor intensive, material resources, and also the information transmission is slow, can't realize the teletransmission of monitoring in real time and data, has influenced monitoring accuracy and promptness.In recent years, the monitoring system of some soil moisture contents also occurs, but be limited to the soil moisture content monitoring in the big paulin mostly, used power supply power supply in the big paulin, be not suitable for open-air the use; Or the soil moisture content monitoring in experiment base, adopt the store sample data, carry out the online peek of timing by RS-232, monitoring index is few, does not possess remote data transmission.
Summary of the invention:
The objective of the invention is to: a kind of dependable performance is provided, remote data transmission is timely and low in energy consumption, be adapted to multi-index field soil moisture content remote observation system solar powered, the system operation cost less expensive, to solve the problem that prior art exists.
The present invention is achieved in that it is made up of central station (1) and at least one monitoring station (2), central station (1) connects each monitoring station (2) by GSM exchange of short messages center, or link to each other with the data processing centre (DPC) with mobile gateway (3) by the GSM/GPRS/CDMA mobile radio communication, data processing centre (DPC) (3) connects each monitoring station (2) by the GSM/GPRS/CDMA mobile radio communication.
Central station (1) is made of message pick-up and sending module (4), supervisory control comuter (5), server (6), big screen display screen (7), message pick-up and sending module (4) connect supervisory control comuter (5), supervisory control comuter (5) Connection Service device (6) and big screen display screen (7) are equipped with messaging software and monitoring software based on Geographic Information System (GIS) in supervisory control comuter (5).
Central station (1) is made of message pick-up and sending module (4), supervisory control comuter (5), server (6), big screen display screen (7), message pick-up and sending module (4) connect supervisory control comuter (5), supervisory control comuter (5) Connection Service device (6) and big screen display screen (7) are equipped with messaging software and monitoring software based on Geographic Information System (GIS) in supervisory control comuter (5).
The message pick-up of described central station (1) and sending module (4) are by 24AH battery pack (8), charging-discharging controller (9), wireless communication module (10), controller and data processing module (11) constitute, the current input terminal of charging-discharging controller (9) connects AC/DC adapter (12), AC/DC adapter (12) connects the 220V/50HZ AC power, the current output terminal of charging-discharging controller (9) connects 24AH battery pack (8), wireless communication module (10) and controller and data processing module (11), wireless communication module (10) connects controller and data processing module (11), and controller and data processing module (11) connect supervisory control comuter (5).
Monitoring station (2) is by sensor probe group (13) and transmitter group (14), interface and data acquisition module (15), controller and data processing module (11), wireless communication module (10) and solar power supply system are formed, sensor probe group (13) connects transmitter group (14), transmitter group (14) connecting interface and data acquisition module (15), interface and data acquisition module (15) connect controller and data processing module (11) by 40 pin signal plugs (16), controller and data processing module (11) connect wireless communication module (10), controller and data processing module (11), wireless communication module (10) connects solar power supply system.
The sensor probe group (13) of monitoring station (2) is made up of rain sensor, atmosphere temperature transducer, atmospheric humidity sensor, soil moisture sensor, soil moisture sensor, air velocity transducer, wind transducer, radiation sensor, water evaporates sensor etc., and connects transmitter group (14) by lead.
The solar power supply system of monitoring station (2) is made up of 15-30W solar panel array (17), charging-discharging controller (9) and 17-30AH battery group (18), 15-30W solar panel array (17) connects charging-discharging controller (9), and charging-discharging controller (9) connects 17-30AH battery group (18).
Being provided with a power consumption in the interface of monitoring station (2) and data acquisition module (15) is 2 road microrelays of 2.4V greater than 300mW, operation voltage, the input end of 2 road microrelays connects the D/A output signal end of controller and data processing module (11), and output terminal connects the numeral of 3.3V power supply or power supply and the transmitter group (14) of employing 12V power supply and the power supply of sensor probe group (13) of analog signal interface respectively.
Wireless communication module (10) is made up of antenna, GSM chip, SIM card seat, RS-232 socket, peripheral circuit and device, the RS-232 socket connects controller and data processing module (11), and peripheral circuit is connected the current output terminal of charging-discharging controller (9) with device.
The control chip of controller and data processing module (11) is the C8051F020 single-chip microcomputer of U.S. Cygnal company.
Compared with prior art, the present invention can carry out long-range many index monitorings and control to soil moisture content, and it is on duty to need not the people, has reduced the consumption of human and material resources, and realizes that the remote live of data transmits, and has improved monitoring accuracy and promptness greatly.Simultaneously, the present invention adopts low power dissipation design and intermittent power supply, and every certain interval of time (adjusting of central station remote command) is gathered, handled and launches a secondary data, to reduce system power dissipation, satisfies the requirement of open-air many index monitorings.The controller of monitoring station of the present invention and the controller core of data processing module are selected the mixed signal integrated chip for use, this chip is integrated multi-channel A/D and D/A, the interface that extendible 4 road RS-232 ports etc. are abundant, saved the device power consumption of a large amount of peripheral interface circuits, for the low power capabilities of system is laid a good foundation, the system that makes can be under the electric power system environment of 15-30W solar panels and 17-25AH battery, 10～20 groups of monitoring indexes, below the quiescent dissipation 0.2W of assurance system, dynamic power consumption is about 2W, the system that can guarantee is in continuous overcast and rainy 60 days operate as normal still, also simplify simultaneously the design of system, improved the stability of system.The present invention utilizes present mobile communication network (GSM/GPRS/CDMA), sets up the long-distance wireless monitoring net, makes system's economical operation, simple, safety, reliable.
Description of drawings:
Fig. 1 is the structural representation of a kind of networking mode of the present invention;
Fig. 2 is the structural representation of another kind of networking mode of the present invention;
Fig. 3 is the composition synoptic diagram of central station of the present invention;
Fig. 4 is the composition synoptic diagram of monitoring station of the present invention;
Fig. 5 is the logical organization synoptic diagram of data of the present invention and acquisition module;
Fig. 6 is the logical organization synoptic diagram of solar power supply system of the present invention;
Fig. 7 is the microrelay 1 in interface of the present invention and the data acquisition module and the catenation principle figure of microrelay 2.
Embodiment:
Embodiments of the invention: low-power consumption multi-index field soil moisture content monitoring system of the present invention is made up of central station 1 and at least one monitoring station 2, scale according to system is big, little and demand, central station 1 can adopt two kinds of networking modes with monitoring station 2: first kind of mode, as shown in Figure 1, central station 1 links to each other with the data processing centre (DPC) 3 with mobile gateway by the GSM/GPRS/CDMA mobile radio communication, data processing centre (DPC) 3 connects each monitoring station 2 by the GSM/GPRS/CDMA mobile radio communication again, each monitoring station 2 utilizes the form of GSM/GPRS/CDMA mobile communications network with short message, report and submit data to data processing centre (DPC) 3, data processing centre (DPC) 3 with the form of short message, reports and submits data by GSM/GPRS/CDMA to each central station 1 more in real time; The second way, as shown in Figure 2, central station 1 connects each monitoring station 2 by GSM exchange of short messages center, and each monitoring station 2 is directly transmitted data with each central station 1 by short message.
As shown in Figure 3, central station 1 is made of message pick-up and sending module 4, supervisory control comuter 5, server 6, big screen display screen 7, message pick-up and sending module 4 connect supervisory control comuter 5, supervisory control comuter 5 Connection Service devices 6 and big screen display screen 7, supervisory control comuter 5 receives the data that each monitoring station 2 is transmitted by message pick-up and sending module 4, and to each monitoring station 2 transmitting control commands; In supervisory control comuter 5, be equipped with based on the Geographic Information System messaging software and the monitoring software of (being called for short GIS), can be by the GIS messaging software according to the geographic position and the part meteorological data of monitoring station 2, utilize technology such as data mining, data analysis, dope with this monitoring station 2 is the regional soil information at center, and represent with color lump, be shown in the big screen display screen 7, reach the effect of demonstration directly perceived.Monitoring software of the present invention is developed based on GIS.Software adopts Object Oriented method, development platform is selected the Mapinfo mapx software of Mapinfo company for use, can realize the indefinite scale convergent-divergent, the roaming full figure, functions such as quick location, monitoring station, under the support of spatial geographic information and electronic chart, the application and the visual degree of system have been improved, realized the multifaceted inquiry of multi-angle, the related real-time information and the image information of monitoring station on electronic chart, made things convenient for the management of system to extensive monitoring station group, simultaneously, system analyzes the soil moisture content of region, monitoring station automatically through the data mining forecast analysis, and show in electronic chart with different colors, for water conservancy supervision department and relevant government department provide decision-making foundation.The background data base system selects the MS SQLServer software of Microsoft company for use, adopt the C/S mechanical development, has the multiple website inquiry mode of electronic chart and form, have and report to the police and prompt facility and real time data display mode intuitively, as the dynamic number strong point, rod figure, pointer, real-time curve etc. can reflect the development trend of each monitoring index clearly.Aspect the remote supervisory of monitoring station, has monitoring station Long-distance Control panel, can send various supervision orders to the appointment monitoring station, for example: ON/OFF is specified monitoring station, communication line and monitoring station self check, request msg, central station is set, calibrates the monitoring station clock, is inquired about each operational factor of monitoring station etc.; Have monitoring station alarm threshold setting, gather and report and submit functions such as cycle data and frequency configuration.
The message pick-up of central station 1 and sending module 4 are by 24AH battery pack 8, charging-discharging controller 9, wireless communication module 10, controller and data processing module 11 constitute, the current input terminal of charging-discharging controller 9 connects AC/DC adapter 12, AC/DC adapter 12 connects the AC power of 220V/50HZ, the current output terminal of charging-discharging controller 9 connects 24AH battery pack 8, wireless communication module 10 and controller and data processing module 11, wireless communication module 10 connects controller and data processing module 11 by the RS-232 digital interface, and controller and data processing module 11 connect supervisory control comuter 5 by the RS-232 digital interface.
As shown in Figure 4, monitoring station 2 is by sensor probe group 13 and transmitter group 14, interface and data acquisition module 15, controller and data processing module 11, wireless communication module 10 and solar power supply system are formed, finish the timing data sampling, data storage, data processing, data such as report and submit at work, sensor probe group 13 connects transmitter group 14, transmitter group 14 is by RS-232/RS-485 digital interface or analog signal interface connecting interface and data acquisition module 15, interface and data acquisition module 15 connect controller and data processing module 11 by 40 pin signal plugs 16, controller and data processing module 11 connect wireless communication module 10, controller and data processing module 11 by the RS-232 digital interface, wireless communication module 10 connects solar power supply system.Primary demand according to soil moisture content, sensor probe group 13 is made up of sensors such as rain sensor, atmosphere temperature transducer, atmospheric humidity sensor, soil moisture sensor, soil moisture sensor (3 covers divide 3 layers of soil layer to bury underground), air velocity transducer, wind transducer, radiation sensor, water evaporates sensors and is connected transmitter group 14 by lead, and many groups such as rainfall, air themperature, air humidity, the soil moisture, soil moisture, wind speed, wind direction, radiation, evaporation sensor is monitored simultaneously (can increase underground water, air pressure, CO according to demand
2Deng monitoring index), sensor probe group 13 adopts 4-20mA, 0-10V standard analog signal or digital signal output, monitoring station 2 is normally in service, the simulation signal generator that 15 pairs of sensor probe groups 13 of interface and data acquisition module transmit was gathered 1 secondary data in per 0.1 second, regularly carry out data screening, digital signal is adopted shake hands agreement or timing acquiring, after finishing, data acquisition send controller and data processing module 11 to carry out data processing, then according to the transmission cycle and the frequency of central station 1 regulation, add transmitting time and date, accumulate data set, give each central station 1 by wireless communication module 10 timed sending.
In order to satisfy the requirement of the open-air unmanned work of system, the power-supply system of monitoring station 2 adopts solar electric power supply system, as shown in Figure 6, it is made up of 15-30W solar panel array 17, charging-discharging controller 9 and 17-30AH battery group 18,15-30W solar panel array 17 connects charging-discharging controller 9, and charging-discharging controller 9 connects 17-30AH battery group 18.The effect of 15-30W solar panel array 17 is that solar radiant energy is directly changed into direct current, and it is interior standby to use or be stored in 17-30AH battery group 18 for load; Charging-discharging controller 9 can be 17-30AH battery group 18 best charging current and voltage is provided, fast, steadily, be 18 chargings of 17-30AH battery group efficiently, and in charging process, reduce loss, prolong serviceable life of 17-30AH battery group 18 as far as possible, protect 17-30AH battery group 18 simultaneously, avoid overcharging and the generation of overdischarge phenomenon, write down simultaneously and show as various significant datas such as charging current, voltages; 17-30AH battery group 18 can be stored the direct current that 15-30W solar panel array 17 sends, and uses for load.Because solar panel array charges to the battery group by day, return the load electricity consumption simultaneously, load electricity consumption in evening is all supplied with by the battery group, therefore, require the self discharge of battery group little, and charge efficiency is high, considers factors such as whether price and use make things convenient for simultaneously, and battery group of the present invention is selected 17-30AH battery group for use.Above-mentioned power-supply system adopts intermittent power supply under the situation at 30-60 days cloudy daies, guarantee that 1-8 hour every day, (being regulated by central station 1 remote command) sent one group of information; Monitoring station 2 input voltage DC12V, static output current 30mA, dynamic output current 500mA, 2Sec normal working hours such as data acquisition behind the system wake-up, data processing, data transmission, sunshine time 6～7h be equipped with 16 the tunnel have 4-20mA or 0-10V industrial standard analog signal interface, 4 have under RS-232 and several RS-485/422 standardized digital signal interfaces and the condition relevant sensor of soil moisture content, can guarantee the every function operate as normal of long-range soil moisture content on-line monitoring.
For reducing power consumption, the present invention 2 has designed interface and data acquisition module 15 separately in the monitoring station, as shown in Figure 5, being provided with a power in interface and data acquisition module 15 is 2 road microrelays of 2.4V greater than 300mW, operation voltage, the input end of 2 road microrelays connects the D/A output signal end of controller and data processing module 11, and output terminal connects the numeral of 3.3V power supply or power supply and the transmitter group 14 of employing 12V power supply and the power supply of sensor probe group 13 of analog signal interface respectively.When the control chip dormancy in controller and the data processing module 11, at first through its D/A output " 0 ", 2 road microrelays disconnect, thereby the RS-232/RS-485 digital interface of interface and data acquisition module 15 peripheries or analog signal interface and transmitter group 14, sensor probe group 13 are quit work; When the control chip in controller and the data processing module 11 is waken up, through D/A output " 256 ", 2 road microrelays are connected, the RS-232/RS-485 digital interface of interface and data acquisition module 15 peripheries or analog signal interface and transmitter group 14, sensor probe group 13 are started working, make monitoring station 2 intermittent power supplies, reach the purpose that reduces power consumption.Because monitoring station 2 needs to intercept external command by communication, so that wake the control chip in controller and the data processing module 11 at any time up, simultaneously, rain sensor in the sensor probe group 13 also needs monitoring rainfall information in real time, therefore, the unreal power supply of in the ranks having a rest of wireless communication module 10 and rain sensor is to guarantee monitoring station 2 normally operation under the situation that many group (10～20 groups of sensors) sensors are monitored simultaneously.
The wireless communication module 10 of central station 1 and monitoring station 2 is supported GSM/GPRS/CDMA mobile communications network commonly used at present, selects general GSM chip, outstanding data communication function, special designs.It is made up of antenna, GSM chip, SIM card seat, RS-232 socket, peripheral circuit and device, and the RS-232 socket connects controller and data processing module 11, and peripheral circuit is connected the current output terminal of charging-discharging controller 9 with device.The GSM chip is selected the GSM/GPRS/CDMA family chip of French WAVECOM company for use, itself and GSM phase2/2+ compatibility, support double frequency (GSM/900 and GSM/1800), meet etsi standard GSM0707 and GSM0705, controller and data processing module 11 pass through serial ports, with the AT instruction it is controlled, the AT instruction is a whole set of instruction that main mobile phone manufacturer NOKIA, Erics.son, Motorola and HP develop for GSM jointly.Central station 1 and monitoring station 2 adopt replacing GSM chip and software setting to adjust communication mode, when supporting that short message is communicated by letter with GPRS, can select Q2403 series or Q24X6 family chip for use, select the Q2338 chip when supporting CDMA for use.
The control chip of the controller of central station 1 and monitoring station 2 and data processing module 11 is selected the C8051F020 single-chip microcomputer of U.S. Cygnal company for use, the C8051F020 single-chip microcomputer is the mixed-signal system level microprocessor chip that is integrated on the chip piece, have to endorse in the CIP-51 of 8051 compatibilities of high-speed flow line structure and reach 25MIPS, have 12 8 passage ADC on the chip, two 12 DAC renewal sequential able to programme, two UART serial line interfaces, 5 16 general bit timing devices, the programmable counter of 5 seizure/comparison modules/timer array, serial line interface extends to 6 and 88 passage ADC of increase through software programming.Therefore, system does not increase under the situation of peripheral interface circuit saving power consumption, has 12 8 passage A/D and 88 passage A/D, 2 RS-232 serial line interfaces independently, 2 road D/A, 2 road comparers, but software extensions 4 road RS-232 serial line interfaces.Therefore, can monitor 10～20 indexs simultaneously, can satisfy application requirements of the present invention substantially.When software programming, at the controller of terminal measuring station when system's quiescent operation, clock oscillator is set among system's idle condition and the MCU reduces by 10 times of oscillation frequency, stay the interruption that wouldn't use and timer except that timer 0 (Timer0) and communication disruption (UART1), guarantee normal internal clocking numeration and intercept the rainfall numeration, the system of being convenient to can be timed and wake up.Communication disruption is intercepted the gsm communication module, is convenient to receive the external command waken system.During system wake-up, software recovers above setting one by one.
Claims (7)
1, a kind of multi-index field soil moisture content remote observation system with low-power consumption, it is made up of central station (1) and at least one monitoring station (2), it is characterized in that: central station (1) links to each other with the data processing centre (DPC) with mobile gateway (3) by the GSM/GPRS/CDMA mobile radio communication, and data processing centre (DPC) (3) connects each monitoring station (2) by the GSM/GPRS/CDMA mobile radio communication; Monitoring station (2) is by sensor probe group (13) and transmitter group (14), interface and data acquisition module (15), monitoring station controller and data processing module, monitoring station wireless communication module and solar power supply system are formed, sensor probe group (13) connects transmitter group (14), transmitter group (14) connecting interface and data acquisition module (15), interface and data acquisition module (15) connect monitoring station controller and data processing module by 40 pin signal plugs (16), monitoring station controller and data processing module connect monitoring station wireless communication module, monitoring station controller and data processing module, the monitoring station wireless communication module connects solar power supply system; The sensor probe group (13) of monitoring station (2) is made up of rain sensor, atmosphere temperature transducer, atmospheric humidity sensor, soil moisture sensor, soil moisture sensor, air velocity transducer, wind transducer, radiation sensor, water evaporates sensor, and connects transmitter group (14) by lead; Described solar power supply system is made up of 15-30W solar panel array (17), first charging-discharging controller and 17-30AH monitoring station battery group (18), 15-30W solar panel array (17) connects first charging-discharging controller, and first charging-discharging controller connects 17-30AH monitoring station battery group (18); Being provided with a power consumption in the interface of monitoring station (2) and data acquisition module (15) is 2 road microrelays of 2.4V greater than 300mW, operation voltage, the input end of 2 road microrelays connects the D/A output signal end of monitoring station controller and data processing module, and output terminal connects the numeral of 3.3V power supply or power supply and the transmitter group (14) of employing 12V power supply and the power supply of sensor probe group (13) of analog signal interface respectively.
2, multi-index field soil moisture content remote observation system with low-power consumption according to claim 1, it is characterized in that: central station (1) is made of message pick-up and sending module (4), supervisory control comuter (5), server (6), big screen display screen (7), message pick-up and sending module (4) connect supervisory control comuter (5), supervisory control comuter (5) Connection Service device (6) and big screen display screen (7) are equipped with messaging software and monitoring software based on Geographic Information System in supervisory control comuter (5).
3, multi-index field soil moisture content remote observation system with low-power consumption according to claim 2, it is characterized in that: the message pick-up of described central station (1) and sending module (4) are by 24AH central station battery pack (8), second charging-discharging controller, the central station wireless communication module, central station controller and data processing module constitute, the current input terminal of second charging-discharging controller connects AC/DC adapter (12), AC/DC adapter (12) connects the 220V/50HZ AC power, the current output terminal of second charging-discharging controller connects 24AH central station battery pack (8), central station wireless communication module and central station controller and data processing module, the central station wireless communication module connects central station controller and data processing module, and central station controller and data processing module connect supervisory control comuter (5).
4, multi-index field soil moisture content remote observation system with low-power consumption according to claim 1, it is characterized in that: the monitoring station wireless communication module is made up of antenna, GSM chip, SIM card seat, RS-232 socket, peripheral circuit and device, the RS-232 socket connects monitoring station controller and data processing module, and peripheral circuit is connected the current output terminal of first charging-discharging controller with device.
5, multi-index field soil moisture content remote observation system with low-power consumption according to claim 1 is characterized in that: the control chip of monitoring station controller and data processing module is the C8051F020 single-chip microcomputer of U.S. Cygnal company.
6, multi-index field soil moisture content remote observation system with low-power consumption according to claim 3, it is characterized in that: the central station wireless communication module is made up of antenna, GSM chip, SIM card seat, RS-232 socket, peripheral circuit and device, the RS-232 socket connects central station controller and data processing module, and peripheral circuit is connected the current output terminal of second charging-discharging controller with device.
7, multi-index field soil moisture content remote observation system with low-power consumption according to claim 3 is characterized in that: the control chip of central station controller and data processing module is the C8051F020 single-chip microcomputer of U.S. Cygnal company.
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| CNB2006100512289A CN100428283C (en) | 2006-09-25 | 2006-09-25 | Multi-index field soil moisture content remote observation system with low-power consumption |
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| CN102890857B (en) * | 2012-09-14 | 2014-07-02 | 北京农业智能装备技术研究中心 | System for remotely collecting and issuing farmland moisture content |
| CN103542891A (en) * | 2013-10-24 | 2014-01-29 | 北京科百宏业科技有限公司 | Soil moisture status monitoring system |
| CN104464249A (en) * | 2014-12-18 | 2015-03-25 | 重庆多邦科技发展有限公司 | Telemetry terminal machine with low cost, low power consumption, small size and small system |
| CN105739402B (en) * | 2016-05-10 | 2018-10-26 | 云南省交通规划设计研究院 | A kind of field adopts transmitting apparatus with intelligent data and adopts forwarding method |
| CN106949928A (en) * | 2017-03-01 | 2017-07-14 | 南京朴厚生态科技有限公司 | The auto acquisition system and method for sensing data |
| CN110942609A (en) * | 2019-12-04 | 2020-03-31 | 安徽农业大学 | Low-power consumption telemetering equipment and system for agricultural condition monitoring |
| CN111294267B (en) * | 2020-03-17 | 2021-10-22 | 翕芯微电子技术(无锡)有限公司 | Multi-machine data communication system based on 4-20mA current loop |
| CN113539047A (en) * | 2021-08-20 | 2021-10-22 | 海南大学 | Linked parallel ecological environment simulation device and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414211A (en) * | 2002-10-22 | 2003-04-30 | 孙殿新 | Oil field production monitoring and management system |
| CN1808170A (en) * | 2006-02-23 | 2006-07-26 | 林秋城 | Positioning monitoring system based on GPS technology |
| CN200950292Y (en) * | 2006-09-25 | 2007-09-19 | 张小平 | Low-power consumption multi-index field soil moisture content remote monitoring system |
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2006
- 2006-09-25 CN CNB2006100512289A patent/CN100428283C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1414211A (en) * | 2002-10-22 | 2003-04-30 | 孙殿新 | Oil field production monitoring and management system |
| CN1808170A (en) * | 2006-02-23 | 2006-07-26 | 林秋城 | Positioning monitoring system based on GPS technology |
| CN200950292Y (en) * | 2006-09-25 | 2007-09-19 | 张小平 | Low-power consumption multi-index field soil moisture content remote monitoring system |
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