CN113382461B - Wireless passive sensor and wireless communication parameter test method thereof - Google Patents
Wireless passive sensor and wireless communication parameter test method thereof Download PDFInfo
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- CN113382461B CN113382461B CN202110503367.5A CN202110503367A CN113382461B CN 113382461 B CN113382461 B CN 113382461B CN 202110503367 A CN202110503367 A CN 202110503367A CN 113382461 B CN113382461 B CN 113382461B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application discloses a wireless passive sensor and a wireless communication parameter test method thereof, which comprises a sensing end, a wireless passive controller and a man-machine interaction end, wherein the sensing end is connected with the wireless passive controller through a signal measurement and control interface, and the wireless passive controller is connected with the man-machine interaction end through a wireless module, and the specific implementation steps are as follows: setting up wireless communication connection of the wireless passive sensor, and taking the wireless passive sensor control as information interaction between the transparent transponder test sensing end and the man-machine interaction end; determining multidimensional parameters for controlling the air speed in the wireless passive transmission controller, and creating a calculation model of the wireless communication distance and the wireless communication transmission time of the first wireless communication module; debugging a parameter set of multidimensional parameters, and selecting a parameter set with large transmission distance and low electric quantity loss from the parameter set; the application adopts the most reasonable wireless parameter setting, improves the communication distance and ensures that the electric energy consumed during data transmission is minimum.
Description
Technical Field
The application relates to the technical field of wireless passive sensors, in particular to a wireless passive sensor and a wireless communication parameter test method thereof.
Background
At present, most of the output signals of the sensors are current, voltage, frequency, pulse and digital interfaces, and the using methods of the sensors are as follows: the sensor is arranged at a position to be measured, and a measuring cable is used for leading out power supply and signal output to an acquisition instrument (a full-automatic acquisition instrument, a wireless acquisition instrument, a handheld reading device and the like).
Compared with the traditional sensor, the wireless passive sensor has the advantages that a large amount of cable materials can be saved, the labor cost of cable construction can be saved, the installation efficiency is improved, the labor intensity is reduced, the electricity consumption is reduced, but most of the wireless passive sensor uses a disposable non-rechargeable battery to provide power for the sensor, such as a lithium battery, but the battery supplies power for both the wireless passive controller and the sensing end, and all power supplies required by realizing the wireless communication function and the data acquisition function are provided, so that the wireless passive controller must realize low power consumption to ensure the durable power supply of the battery.
As is well known, the higher the wireless communication rate of a wireless module (such as a bluetooth communication module), the lower the consumed electric quantity, but the shorter the transmission distance, and the lower the wireless communication rate, the higher the consumed electric quantity, but the longer the transmission distance, so the current wireless module cannot meet the bidirectional requirements of the consumed electric quantity and the transmission distance, the shorter the transmission distance cannot meet the long-distance monitoring, and the higher the consumed electric quantity cannot guarantee the durable power supply of the battery.
Disclosure of Invention
The application aims to provide a wireless passive sensor and a wireless communication parameter test method thereof, which are used for solving the technical problems that a wireless module in the prior art cannot meet the bidirectional requirements of consumed electric quantity and transmission distance, the transmission distance is short and cannot meet long-distance monitoring, and the higher the consumed electric quantity is, the longer the power supply of a battery cannot be ensured.
In order to solve the technical problems, the application specifically provides the following technical scheme:
a wireless passive sensor comprises a sensing end, a wireless passive controller and a man-machine interaction end;
the sensor of the sensing end acquires a power supply from the wireless passive controller and outputs a sensing signal to the wireless passive controller;
the wireless passive controller comprises a first micro-control unit, a first battery pack and a first wireless communication module, wherein the first battery pack and the first wireless communication module are connected with different pins of the first micro-control unit, the wireless passive controller sends a sensing signal of the sensing end to the man-machine interaction end for wireless interaction through the first wireless communication module, and the first battery pack respectively provides power for an electronic device of the wireless passive controller and a plurality of sensors of the sensing end;
the man-machine interaction end comprises a second micro control unit, a key selector and a second wireless communication module, wherein the key selector and the second wireless communication module are connected with different pins of the second micro control unit, and the man-machine interaction end receives the sensing signal output by the sensing end through data interaction between the second wireless communication module and the first wireless communication module.
As a preferred scheme of the application, the first battery pack is used for supplying power to the wireless passive controller and the sensing terminal;
the first micro control unit adopts an STC8A8K processing chip and is used for completing the overall work logic regulation and control of the wireless passive controller and controlling the information interaction between the wireless passive controller and the sensing end and between the wireless passive controller and the man-machine interaction end;
the first wireless communication module adopts an SX1278 wireless module or a Bluetooth communication module and is used for realizing wireless data receiving and transmitting under the control of the first micro control unit;
the second micro control unit is used for regulating and controlling the man-machine interaction end to complete data interaction and data reading operation;
the second wireless communication module adopts an SX1278 communication module or a Bluetooth communication module and is used for completing information interaction with the first wireless communication module under the control of the second micro control unit.
In order to solve the technical problems, the application further provides the following technical scheme, namely a wireless communication parameter test method of a wireless passive sensor, which comprises the following steps:
step 100, wireless communication connection of a wireless passive sensor is established, and wireless passive sensing control is used as information interaction between a transparent transponder test sensing end and a man-machine interaction end;
step 200, determining multidimensional parameters for controlling the air speed in the wireless passive transmission controller, and creating a calculation model of the wireless communication distance and the wireless communication transmission time of the first wireless communication module;
step 300, debugging the parameter set of the multidimensional parameters, and selecting the parameter set with large transmission distance and low electric quantity loss from the parameter set.
In step 100, the sensing end is in bidirectional communication connection with the wireless passive sensor through a signal measurement and control interface, and the wireless passive controller is in communication connection with the man-machine interaction end through a wireless module port;
the wireless passive controller forwards the data acquired by the signal measurement and control interface to the man-machine interaction end through a wireless module port;
and the wireless passive controller converts the data received by the wireless module port and regulates and controls the sensing end through the signal measurement and control interface.
As a preferable mode of the present application, when the wireless passive controller transmits the sensing data, a preset prefix character string is automatically added before the sensing data to distinguish the sensing data.
As a preferred solution of the present application, in step 200, the air rate of the wireless module is controlled by three parameters, namely, a spreading factor, a coding rate and a channel bandwidth, and the calculation formula of the air rate is specifically:
wherein SF is a spreading factor, BW is a channel bandwidth, and CR is a coding rate.
The wireless communication transmission time is related to the air speed, and the calculation formula of the wireless communication transmission time is specifically as follows:
wherein n is the size of the data packet sent by the wireless passive controller, RATE RF Is the air rate of the wireless module.
As a preferred solution of the present application, the wireless communication distance calculation formula specifically includes:
d=10 x (radio transmit power-receive sensitivity-dielectric loss-32.44-20×log) 10 (radio center frequency));
the wireless transmitting power and the wireless module center frequency are adjusted through gears, the range of the wireless transmitting power corresponding to all gears is 5-20 dBm, and the range of the wireless module center frequency corresponding to all gears is 420-450 MHz;
the dielectric loss is constant;
the calculation formula of the receiving sensitivity is as follows:
wherein A and B are constants, and A is in kHZ and B is in dBm; the reception sensitivity is proportional to the spreading factor and inversely proportional to the channel bandwidth.
As a preferable scheme of the application, the wireless transmitting power of the wireless passive controller is in a direct proportion relation with the current consumption, the current consumption increases in the same direction along with the increase of the wireless transmitting power, and the current consumption decreases in the same direction along with the decrease of the wireless transmitting power;
the wireless passive controller calculates the energy consumption in the process of sending the acquired sensing data as follows:
W＝I*t；
wherein I is current consumption, and the current consumption is determined according to a selected value of the wireless transmit power.
As a preferred solution of the present application, in step 300, a parameter set of the multidimensional parameter is debugged, and a parameter set with a long wireless communication distance is selected from the parameter set, which is specifically implemented as follows:
building a wireless passive controller and a man-machine interaction end, actually measuring a distance D between the wireless passive controller and the man-machine interaction end, and setting a wireless communication distance to be at least 2D to ensure redundancy conditions of data transceiving;
selecting a plurality of groups of spreading factors and channel bandwidths to be combined arbitrarily, substituting the combinations into a calculation formula of the receiving sensitivity, and forming a sensitivity parameter group by all the calculated receiving sensitivities;
and (3) randomly combining each group of data of the sensitivity parameter group with a plurality of groups of wireless transmitting power, substituting the data into a calculation formula of the wireless communication distance, screening out a combination with the wireless communication distance being more than or equal to 2D, and defining the corresponding spread spectrum factor, channel bandwidth and wireless transmitting power of the sensitivity parameter group as a distance coincidence parameter group.
As a preferable scheme of the application, the multi-parameter with low electricity consumption is screened out from the distance coincidence parameter group, and the specific implementation method is as follows:
each group of distance coincidence parameter sets are respectively and randomly combined with a plurality of groups of parameter alternative values of the encoding rate, and substituted into a calculation formula of the air rate, so that all the air rates are calculated and defined as air rate parameter sets;
substituting each air rate into a calculation formula of wireless communication transmission time, and calculating transmission time values under different air rates;
substituting the transmission time value and the current consumption of the corresponding wireless transmission power into a calculation formula of energy consumption to obtain energy consumption values of all data transmission;
and sequencing the energy consumption values, and taking out a group with the smallest value, wherein all the calculated parameters used by the group, namely the spreading factor, the channel bandwidth, the coding rate and the wireless transmission power value, are the optimal parameter values.
Compared with the prior art, the application has the following beneficial effects:
the application adjusts the data combination among multiple parameters affecting the wireless communication rate in the wireless passive controller, adopts the most reasonable wireless parameter setting, improves the communication distance and ensures that the electric energy consumed during data transmission is minimum.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
FIG. 1 is a schematic diagram of a structure provided in an embodiment of the present application;
fig. 2 is a flowchart of a wireless communication parameter test method according to an embodiment of the present application.
Reference numerals in the drawings are respectively as follows:
1-a sensing end; 2-a wireless passive controller; 3-a man-machine interaction end;
21-a first micro control unit; 22-a first battery pack; 23-a first wireless communication module; 24-a signal measurement and control interface; 25-a programmable power supply group; 26-timer; 27-a timing clock;
31-a second micro control unit; 32-a key selector; 33-a second wireless communication module; 34-a display unit; 35-a second battery.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1, the present application provides a wireless passive sensor, which includes a sensing end 1, a wireless passive controller 2 and a man-machine interaction end 3, wherein the sensing end 1 is composed of a plurality of sensors with different types of output signals, such as a vibrating wire sensor, a pulse sensor and a digital sensor, the sensing end 1 is generally connected with an integrated port of the wireless passive controller 2 through a short cable, and the sensor of the sensing end 1 acquires a power supply from the wireless passive controller 2 and outputs the sensing signal to the wireless passive controller 2.
The wireless passive controller 2 comprises a first micro-control unit 21, a first battery pack 22 and a first wireless communication module 23 which are connected with different pins of the first micro-control unit 21, and also comprises a signal measurement and control interface 24, a programmable power pack 25, a timer 26 and a timing clock 27 which are controlled by the first micro-control unit 21.
The wireless passive controller 2 sends the sensing signal of the sensing terminal 1 to the man-machine interaction terminal 3 through the first wireless communication module 23 for wireless interaction, and the first battery pack 22 respectively provides power for the electronic devices of the wireless passive controller 2 and the plurality of sensors of the sensing terminal 1.
The first battery pack 22 is used to power the wireless passive controller 2 and the sensor terminal 1.
In particular, in order to avoid self-consumption of electric power caused by self-discharge of the battery, the battery type is a disposable non-rechargeable battery having a low self-discharge rate, for example: the lithium battery, the first micro control unit 21 can measure the battery power, and send out prompt information when the battery power is low.
The first micro control unit 21 adopts an STC8A8K processing chip, is a programmable device, and is used for completing the overall work logic regulation and control of the wireless passive controller 2 and controlling the information interaction between the wireless passive controller 2 and the sensing end 1 and the man-machine interaction end 3, that is, all the work logic, current control and information interaction of the wireless passive controller 2 are completed by the first micro control unit 21, and the control and sampling of the programmable power supply group, the timer, the wireless module and the signal measurement and control module can be completed.
The signal measurement and control interface 24 is used for providing a plurality of data transmission interfaces matched with sensors of different types of output signals, and completing a functional circuit set for controlling and measuring voltage, current, vibrating wire and digital sensors.
For example, the signal measurement and control interface 24 of the present embodiment may identify vibration wire sensors of the models VM501, VM604, VM708, etc., the voltage measurement may use ADC chip ADS8320, etc., the current measurement may use precision sampling resistor to convert into voltage signal through operational amplification, use ADC chip to collect voltage, the digital sensing measurement may use UART interface of MCU to convert into RS485 through MAX3485 or use MAX3232 chip to convert into RS232, and complete sensing data acquisition according to the connected digital sensor communication protocol.
The programmable power supply unit 25 obtains the electric quantity from the first battery pack 22 and provides different power supplies required for the signal measurement and control interface 24, the timer 26 and the first wireless communication module 23.
Further, the sensors can be divided into an active type and a passive type, and for most of the voltage, current and digital output type sensors, the sensors need to be powered and then can work normally to output sensing signals or data, while the vibrating wire type and pulse type sensors are passive type sensors, and need to send specific excitation signals to the sensors and then can output signals, so that the first micro-processing unit 21 of the embodiment controls the programmable power supply unit 25 to provide different voltage or current driving sources designated by the sensors to the signal measurement and control interface 24 in the process of sampling and controlling.
The first wireless communication module 23 adopts an SX1278 wireless module or a bluetooth communication module, and is used for implementing wireless data transceiving, switching, communication protocol analysis and other tasks under the control of the first micro control unit 21.
The timer 26 is of the SD3078 type, and outputs an interrupt signal to the first micro-control unit 21 when the timing is completed, for intermittent data acquisition of the sensor 1.
The timing clock 27 comprises a real-time clock chip and a button battery, and is used for providing real-time date and time, and packaging and storing the sensing signal received each time and the date and time in a Flash memory or sending the sensing signal and the date and time to the man-machine interaction terminal 3.
The Flash memory is responsible for locally storing sensor data in the wireless passive controller 2, and periodically sending the data after the sensor data is stored locally, if the sending is successful, the record is marked as sent, if the sending is unsuccessful, the record is marked as not sent, and the data which is not sent can try to be resent in the next sending process.
It should be further specifically noted that, the wireless passive controller 2 of this embodiment further includes a parameter setter, which is configured to quickly set a hardware interface of a main operating parameter of the wireless passive controller, and in this embodiment, three parameters including a controller address, a wireless parameter channel, and a timer time are selected as the main operating parameters of the controller, and 3 sets of parameters are correspondingly configured to the hardware interface. For example: the three parameters are quickly set by the user using 3 16-speed rotary switches.
The man-machine interaction end 3 comprises a second micro control unit 31, a key selector 32 connected with different pins of the second micro control unit 31, a second wireless communication module 33, a display unit 34 and a second battery pack 35. The man-machine interaction end 3 receives the sensing signal output by the sensing end 1 through the data interaction between the second wireless communication module 33 and the first wireless communication module 23.
The key selector 32 is used to provide the user with an operation port for data reading and data writing.
The second micro control unit 31 is used for controlling the man-machine interaction end 3 to complete data interaction and data reading operation, namely, complete control work of communication parameter setting, searching by the wireless passive controller 2, key operation identification, screen display and the like of the second wireless communication module 33.
The second wireless communication module 33 adopts an SX1278 communication module or a bluetooth communication module, and is used for completing information interaction with the first wireless communication module 23 under the control of the second micro control unit 31.
The display unit 34 is used for displaying the interaction information of the second wireless communication module 33 and providing a user interaction interface.
The second battery pack 35 is used for providing electric energy for the electronic devices of the man-machine interaction terminal 3.
According to the embodiment, wireless acquisition of the output signals of the main flow sensor is realized, the labor cost of cable construction is reduced, the installation efficiency is improved, the labor intensity is reduced, the electric quantity consumption is saved, and the real-time transmission of data and the low electric quantity consumption can be maintained.
Since the first battery pack 22 supplies power to the wireless passive controller and the programmable power supply unit, and provides all power required by the wireless communication function and the data acquisition function, the wireless passive controller must realize low power consumption to ensure the durable power supply of the first battery pack 22, and as is well known, the higher the wireless communication rate of the first wireless communication module 23, the faster the transmission speed of the data packet, the shorter the transmission data occupation time, the lower the consumed electric quantity, but the shorter the transmission distance.
Therefore, in order to balance the relationship between the transmission distance and the electric quantity consumption, the embodiment particularly provides a wireless communication parameter test method of a wireless passive sensor, which adjusts the data combination among multiple parameters affecting the wireless communication rate in a wireless passive controller, adopts the most reasonable wireless parameter setting, improves the communication distance, and consumes the least electric energy during transmission.
The method comprises the following steps:
and 100, building wireless communication connection of a wireless passive sensor, and taking the wireless passive sensor control as information interaction between a transparent transponder test sensing end and a man-machine interaction end.
In step 100, the sensing end is in bidirectional communication connection with the wireless passive sensor through a signal measurement and control interface, and the wireless passive controller is in communication connection with the man-machine interaction end through a wireless module port;
the wireless passive controller forwards the data acquired by the signal measurement and control interface to the man-machine interaction end through a wireless module port;
the wireless passive controller converts the data received by the wireless module port and then regulates and controls the sensing end through the signal measurement and control interface.
When the wireless passive controller transmits the sensing data, a preset prefix character string is automatically added before the sensing data so as to distinguish the sensing data.
Step 200, determining multidimensional parameters for controlling the air speed in the wireless passive transmission controller, and creating a calculation model of the wireless communication distance and the data transmission energy consumption of the first wireless communication module.
The air rate is the wireless communication rate of the wireless passive controller, and can be controlled by the three register values of the first micro control unit, and the air rate is respectively: the three parameters of the spread spectrum factor SX_SF, the coding rate SX_CR and the channel bandwidth SX_BW have different values and can influence the wireless communication rate, in general, the higher the communication rate is, the faster the transmission speed is, the shorter the occupied time of the transmission data is, the lower the consumed electric quantity is, but the shorter the transmission distance is.
In step 200, the air rate of the wireless module is controlled by three parameters, namely, spreading factor, coding rate and channel bandwidth, and the calculation formula of the air rate is specifically:
wherein SF is a spreading factor, BW is a channel bandwidth, and CR is a coding rate.
The wireless communication transmission time is related to the air speed, and the calculation formula of the wireless communication transmission time is specifically as follows:
wherein n is the size of a data packet sent by the wireless passive controller, RATE RF Is the air rate of the wireless module.
According to the disclosure of the prior art, the wireless communication distance calculation formula is specifically:
d=10 x (radio transmit power-receive sensitivity-dielectric loss-32.44-20×log) 10 (radio center frequency)).
Specifically affecting the transmission distance is the wireless transmission power, the reception sensitivity and the radio wave center frequency, and the higher the transmission power, the lower the reception sensitivity and the lower the center frequency, the farther the wireless communication distance.
The wireless transmitting power and the wireless module center frequency of the wireless passive controller are adjusted through gears, the range of the wireless transmitting power corresponding to all gears is 5-20 dBm, and the range of the wireless module center frequency corresponding to all gears is 420-450 MHz.
The dielectric loss is constant, in general, the dielectric loss of a wireless passive controller is fixed, and the calculation formula of the dielectric loss is:
dielectric loss = transmit power-received signal strength; the specific implementation method comprises the following steps: two wireless passive controllers are respectively arranged at a transmitting place and a receiving place, and wireless parameters are set to be the lowest in receiving sensitivity and the highest in transmitting power; one of the wireless passive controllers sends an instruction to enable the other wireless passive controller to return the signal strength value when receiving data, so that the dielectric loss can be calculated.
The calculation formula of the receiving sensitivity is:
wherein A and B are constants, and A is in kHZ and B is in dBm; the reception sensitivity is proportional to the spreading factor and inversely proportional to the channel bandwidth, and if a lower sensitivity (the farther the communication distance is), the spreading factor SF should be increased or the channel bandwidth BW should be decreased.
It should be further noted that, the wireless transmitting power and the current consumption of the wireless passive controller are in a proportional relationship, the current consumption increases in the same direction with the increase of the wireless transmitting power, and the current consumption decreases in the same direction with the decrease of the wireless transmitting power.
The wireless passive controller calculates the energy consumption in the process of sending the acquired sensing data as follows:
W＝I*t；
wherein I is current consumption, and the current consumption is determined according to a selected value of the wireless transmit power.
In the step, after a calculation model of wireless communication distance and data transmission energy consumption is created, the combined data of wireless transmitting power, receiving sensitivity and radio wave center frequency which affect the wireless communication distance is filtered, and then the filtered combined data is substituted into an energy consumption calculation formula, and the combined data with the minimum energy consumption is selected as the optimal parameter combination.
Specifically, after the optimal parameter combination is selected, the second wireless communication module on the man-machine interaction end is set to be identical to the first wireless communication module in parameters.
Step 300, debugging a parameter set of multidimensional parameters, and selecting a parameter set with large transmission distance and low electric quantity loss from the parameter set.
In step 300, a parameter set of multidimensional parameters is debugged, and a parameter set with long wireless communication distance is selected from the parameter set, and the specific implementation steps are as follows:
setting up a wireless passive controller and a man-machine interaction end, actually measuring a distance D between the wireless passive controller and the man-machine interaction end, and setting a wireless communication distance to be at least 2D to ensure redundant conditions of data receiving and transmitting;
selecting a plurality of groups of spreading factors and channel bandwidths to be combined arbitrarily, substituting the combinations into a calculation formula of the receiving sensitivity, and forming a sensitivity parameter group by all the calculated receiving sensitivity;
and (3) randomly combining each group of data of the sensitivity parameter group with a plurality of groups of wireless transmitting power, substituting the data into a calculation formula of the wireless communication distance, screening out a combination with the wireless communication distance being more than or equal to 2D, and defining the corresponding spread spectrum factor, channel bandwidth and wireless transmitting power of the sensitivity parameter group as a distance coincidence parameter group.
The multi-parameter with low electricity consumption is screened out from the distance coincidence parameter group, and the specific implementation method is as follows:
each group of distance coincidence parameter sets are respectively and randomly combined with a plurality of groups of parameter alternative values of the encoding rate, and are substituted into an air rate calculation formula to calculate all air rates and define the air rate parameter sets;
substituting each air rate into a calculation formula of wireless communication transmission time, and calculating transmission time values under different air rates;
substituting the transmission time value and the current consumption of the corresponding wireless transmission power into a calculation formula of energy consumption to obtain energy consumption values of all data transmission;
and sorting the energy consumption values, and taking out a group with the smallest value, wherein all the calculated parameters used by the group, namely the spreading factor, the channel bandwidth, the coding rate and the wireless transmission power value are the optimal parameter values.
The application obtains the most reasonable wireless parameter value of the wireless module in the wireless passive control in a test mode, so that the wireless transmitting power and the receiving sensitivity are matched with the wireless communication distance, the wireless communication distance has certain redundancy, and the electric quantity consumption during data transmission is the lowest, thereby realizing the long-term operation of the sensor under the condition of no external power supply on the basis of the limit of built-in battery and ultra-low power consumption and energy conservation.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this application will occur to those skilled in the art, and are intended to be within the spirit and scope of the application.
Claims (6)
1. The wireless communication parameter test method of the wireless passive sensor is characterized by comprising the following steps of:
step 100, wireless communication connection of a wireless passive sensor is established, and the wireless passive controller is used as a transparent transponder test sensing end to interact with information of a man-machine interaction end;
the wireless passive sensor comprises a sensing end, a wireless passive controller and a man-machine interaction end, wherein the sensor of the sensing end acquires a power supply from the wireless passive controller and outputs a sensing signal to the wireless passive controller, and the man-machine interaction end receives the sensing signal output by the sensing end through data interaction with the wireless passive controller;
step 200, determining multidimensional parameters for controlling the air speed in the wireless passive controller, and creating a calculation model of the wireless communication distance and the wireless communication transmission time of the first wireless communication module;
step 300, debugging a parameter set of the multidimensional parameters, and selecting a parameter set with large transmission distance and low electric quantity loss from the parameter set;
in step 300, the parameter set of the multidimensional parameter is debugged, and a parameter set with a long wireless communication distance is selected from the parameter set, which comprises the following specific implementation steps:
building a wireless passive controller and a man-machine interaction end, actually measuring a distance D between the wireless passive controller and the man-machine interaction end, and setting a wireless communication distance to be at least 2D to ensure redundancy conditions of data transceiving;
selecting a plurality of groups of spreading factors and channel bandwidths to be combined arbitrarily, substituting the combinations into a calculation formula of the receiving sensitivity, and forming a sensitivity parameter group by all the calculated receiving sensitivity;
each group of data of the sensitivity parameter group and a plurality of groups of wireless transmitting power are combined at will, and substituted into a calculation formula of the wireless communication distance, a combination with the wireless communication distance being more than or equal to 2D is screened out, and the corresponding spread spectrum factor, channel bandwidth and wireless transmitting power of the sensitivity parameter group are defined as a distance coincidence parameter group;
the multi-parameter with low electricity consumption is screened out from the distance coincidence parameter group, and the specific implementation method is as follows:
each group of distance coincidence parameter sets are respectively and randomly combined with a plurality of groups of parameter alternative values of the encoding rate, and substituted into a calculation formula of the air rate, so that all the air rates are calculated and defined as air rate parameter sets;
substituting each air rate into a calculation formula of wireless communication transmission time, and calculating transmission time values under different air rates;
substituting the transmission time value and the current consumption of the corresponding wireless transmission power into a calculation formula of energy consumption to obtain energy consumption values of all data transmission;
and sequencing the energy consumption values, and taking out a group with the smallest value, wherein all the calculated parameters used by the group, namely the spreading factor, the channel bandwidth, the coding rate and the wireless transmission power value, are the optimal parameter values.
2. The method for testing wireless communication parameters of a wireless passive sensor according to claim 1, wherein in step 100, the sensing terminal is in bidirectional communication connection with the wireless passive controller through a signal measurement and control interface, and the wireless passive controller is in communication connection with the man-machine interaction terminal through a wireless module port;
the wireless passive controller forwards the data acquired by the signal measurement and control interface to the man-machine interaction end through a wireless module port;
and the wireless passive controller converts the data received by the wireless module port and regulates and controls the sensing end through the signal measurement and control interface.
3. The method for testing wireless communication parameters of a wireless passive sensor according to claim 2, wherein when the wireless passive controller transmits the sensing data, a preset prefix string is automatically added before the sensing data to distinguish the sensing data.
4. The method of claim 1, wherein in step 200, the air rate of the first wireless communication module is controlled by three parameters, namely a spreading factor, a coding rate and a channel bandwidth, and the calculation formula of the air rate is specifically as follows:
wherein SF is a spreading factor, BW is a channel bandwidth, and CR is a coding rate;
the wireless communication transmission time is related to the air speed, and the calculation formula of the wireless communication transmission time is specifically as follows:
wherein n is the size of the data packet sent by the wireless passive controller, RATE RF Is the air rate of the wireless module.
5. The method for testing wireless communication parameters of a wireless passive sensor according to claim 1, wherein the wireless communication distance calculation formula specifically comprises:
d=10 x (radio transmit power-receive sensitivity-dielectric loss-32.44-20×log) 10 (radio center frequency));
the wireless transmitting power and the wireless module center frequency are adjusted through gears, the range of the wireless transmitting power corresponding to all gears is 5-20 dBm, and the range of the wireless module center frequency corresponding to all gears is 420-450 MHz;
the dielectric loss is constant;
the calculation formula of the receiving sensitivity is as follows:
wherein SF is a spreading factor, BW is a channel bandwidth; the reception sensitivity is proportional to the spreading factor and inversely proportional to the channel bandwidth.
6. The method for testing wireless communication parameters of a wireless passive sensor according to claim 5, wherein the wireless transmission power of the wireless passive controller is in a proportional relationship with the current consumption, the current consumption increases in the same direction with the increase of the wireless transmission power, and the current consumption decreases in the same direction with the decrease of the wireless transmission power;
the wireless passive controller calculates the energy consumption in the process of sending the acquired sensing data as follows:
W＝I*t；
wherein I is current consumption, and the current consumption is determined according to a selected value of the wireless transmit power.
Priority Applications (1)
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