CN117579438A - Remote passive microwave direct-drive self-adaptive sensing communication system and method - Google Patents
Remote passive microwave direct-drive self-adaptive sensing communication system and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/028—Arrangements specific to the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0292—Arrangements specific to the receiver end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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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 invention belongs to the technical field of signal processing, and provides a remote passive microwave direct-drive self-adaptive sensing communication system and method, wherein the main scheme is as follows: the microwave transceiver transmits microwave signals at a maximum transmit power P [ tx_100% ]; the microwave transceiver matches the transmitting power to P [ tx_adjust01] according to a preset shortest operation time interval T [ min ]; the passive microwave direct-drive sensing terminal starts to continuously work and returns corresponding working data to the microwave transceiver, and at the moment, the power of the passive microwave direct-drive sensing terminal received by the microwave transceiver is P [ rx_op ]; and the microwave transceiver judges whether the position of the passive microwave direct-drive sensing terminal is changed according to the real-time comparison between the value of the P [ rx_op ] and the P [ rx_start ], and when the position of the passive microwave direct-drive sensing terminal is changed, the microwave transceiver adjusts the transmitting power P [ tx_adjust01] until the value of the P [ rx_op ] =P [ rx_start ].
Description
Technical Field
The invention relates to the technical field of fluid measurement, in particular to a remote passive microwave direct-drive self-adaptive sensing communication system and method.
Background
In the existing passive radio frequency sensing technology, communication is performed through a radio frequency identification chip, the method can only realize identification of ID, along with the development of the passive internet of things technology, only the identification of ID can not meet the requirements of modern application, and more sensing parameters need to be identified, for example: temperature, vibration, pressure, etc.
At present, two solutions exist, one is to integrate a certain type of sensor inside a radio frequency identification chip, but the sensor integrated on the radio frequency chip cannot be changed, so that the sensor cannot be universal for different measuring ranges, precision and other scenes in the actual use process, and at present, the sensor can only measure for a simple room temperature scene, and meanwhile, the sensor cannot work in a temperature range beyond a certain limit due to the limitation of the working temperature of the integrated radio frequency chip, so that the environmental parameters in a larger range cannot be measured.
The second solution is to add an independent sensor on the periphery of the radio frequency chip, collect radio frequency energy by the radio frequency chip and then supply power to the sensor to drive the sensor to work, but the method usually reaches tens to hundreds of microwatts due to higher power consumption of the external sensor, but the radio frequency energy collection energy is very weak, if the external sensor is required to be driven to work, the radio frequency chip is usually required to be placed near the collector, the defect greatly limits the sensing communication distance between the sensor and the collector, the distance capable of realizing functions in practical application is greatly limited, the requirement of remote passive sensing cannot be met, and the practical application effect is poor.
In addition, in the prior art, because the energy density of the microwave cannot be adaptively adjusted, the maximum power is always adopted for continuous emission, and huge energy consumption and unnecessary electromagnetic interference are brought under the large-quantity and wide-range layout of the sensing system.
Disclosure of Invention
The invention aims to provide a remote passive microwave direct-drive self-adaptive sensing communication system and a remote passive microwave direct-drive self-adaptive sensing communication method, which can enable a passive microwave direct-drive sensing communication terminal to work in a self-adaptive manner under different conditions such as distance, position, signal intensity, radio frequency energy level and the like, realize sensing communication functions under various working conditions, and automatically adjust the running parameters of the whole working system at the same time, so that a microwave transceiver and the passive microwave direct-drive sensing terminal work in a self-adaptive manner under the optimal working condition.
The invention solves the technical problems and adopts the following technical scheme:
in one aspect, the invention provides a remote passive microwave direct-drive self-adaptive sensing communication system, which comprises a microwave transceiver and a passive microwave direct-drive sensing terminal, wherein the passive microwave direct-drive sensing terminal comprises a radio frequency signal matching network, an oscillating signal and energy collecting module, a power management module, an energy storage module, a low-power consumption MCU, a sensing module and a signal modulation module;
the microwave transceiver is used for transmitting microwave signals to a working scene, driving the passive microwave direct-drive sensing terminal to work, and simultaneously receiving and analyzing sensing information returned by the passive microwave direct-drive sensing terminal;
the radio frequency signal matching network is used for receiving the transmitted microwave signals transmitted by the microwave transceiver, filtering the transmitted microwave signals and acquiring microwave energy in the transmitted microwave signals;
the oscillating signal and energy collecting module is used for processing the microwave energy collected by the radio frequency signal matching network to form rectified energy which can be received by the power supply management module;
the power management module is used for collecting rectifying energy and adaptively driving the low-power consumption MCU and the sensing module to perform time-sharing work according to the state of the energy;
the energy storage module is used for collecting and releasing energy in cooperation with the power management module;
the sensing module is used for sensing various different sensing information in the environment where the sensing module is located;
the low-power consumption MCU is used for analyzing sensing information sensed by various sensors in the sensing module, performing analog-to-digital conversion on the sensing information and then sending the sensing information to the signal modulation module;
the signal modulation module is used for modulating the sensing information processed by the low-power MCU into a microwave signal and returning the microwave signal to the microwave transceiver.
On the other hand, the invention also provides a remote passive microwave direct-drive self-adaptive sensing communication method which is applied to the remote passive microwave direct-drive self-adaptive sensing communication system and comprises the following steps:
the microwave transceiver transmits a microwave signal with the maximum transmitting power P [ tx_100% ], the passive microwave direct-drive sensing terminal returns a response signal to the microwave transceiver, and the power value corresponding to the response signal is P [ rx_start ];
the microwave transceiver matches the transmitting power to P [ tx_adjust01] according to a preset shortest working time interval T [ min ] of the passive microwave direct-drive sensing terminal;
the passive microwave direct-drive sensing terminal starts to continuously work and returns corresponding working data to the microwave transceiver, and at the moment, the power of the passive microwave direct-drive sensing terminal received by the microwave transceiver is P [ rx_op ];
the microwave transceiver judges whether the position of the passive microwave direct-drive sensing terminal is changed according to the real-time comparison of the value of P [ rx_op ] and P [ rx_start ], and when the position of the passive microwave direct-drive sensing terminal is changed, the microwave transceiver adjusts the transmitting power P [ tx_adjust01] until P [ rx_op ] =P [ rx_start ];
if the microwave transceiver exceeds Tmin, the transmitting power of the microwave transceiver is regulated to the maximum and the microwave signal is transmitted outwards until the signal returned by the passive microwave direct-drive sensing terminal is received, and after the transmitting power of the microwave transceiver is regulated to the maximum and the microwave signal is transmitted outwards, if the signal returned by the passive microwave direct-drive sensing terminal is not received after the duration of continuously exceeding 50 xTmin, the alarm information is sent.
As further optimization, the passive microwave direct-drive sensing terminal returns a response signal to the microwave transceiver, specifically:
after the passive microwave direct-drive sensing terminal receives the microwave signal, the power management module of the passive microwave direct-drive sensing terminal receives the energy signal output by the radio frequency signal matching network, the oscillation signal and the energy converging module and starts to store the energy signal, and after the energy reaches the condition that the passive microwave direct-drive sensing terminal can work, a response signal is returned to the microwave transceiver.
As a further optimization, the microwave transceiver matches the transmitting power to P [ tx_adjust01] according to the shortest operation time interval T [ min ] of the passive microwave direct-drive sensing terminal, which specifically means that:
after receiving a response signal returned by the passive microwave direct-drive sensing terminal, the microwave transceiver reads a power value P [ rx_start ] corresponding to the response signal;
the microwave transceiver inquires and obtains an initial distance D [ rx_start ] between the microwave transceiver and the passive microwave direct-drive sensing terminal based on the read P [ rx_start ] and by combining a preset power and distance corresponding table;
the microwave transceiver dynamically matches the transmit power Ptx_adjust 01 according to Drx_start and Tmin to meet the requirement of the preset minimum operation time interval.
As a further optimization, after the passive microwave direct-drive sensing terminal receives the microwave signal with the transmission power being P tx_adjust01, the P rx_adjust 01 obtained after the transmission is calculated and compared with the power required by the preset shortest working time interval T min, if the requirement is met, a power management module in the passive microwave direct-drive sensing terminal starts to drive an energy storage module to start energy storage.
As a further optimization, after the power management module in the passive microwave direct-drive sensing terminal starts to drive the energy storage module to start energy storage, the power management module controls the time for supplying power to the energy storage module in real time, and determines the time for charging the energy storage module once and the interval for outputting energy outwards according to the relation between the energy value W [ min ], the working interval reaching the minimum time T [ min ], the single working time T [ op ], the nominal working voltage VDD [ type ], the minimum working voltage VDD [ min ] and the minimum working current Iop [ min ] required by the passive microwave direct-drive sensing terminal for single working.
As a further optimization, the microwave transceiver dynamically matches the transmission power P [ tx_adjust01] according to D [ rx_start ] and T [ min ] to meet the requirement of the preset minimum operation time interval, specifically:
defining the energy value W [ min ] required by single operation of the passive microwave direct-drive sensing terminal as the working energy of the passive sensing terminal, defining the energy of a microwave signal transmitted by a microwave transmitter as passive dynamic microwave driving energy, and according to the law of conservation of energy, the passive dynamic microwave driving energy is equal to the working energy of the passive sensing terminal, namely:
passive dynamic microwave driving energy= ((P [ tx_adjust01] +p [ rx_adjust 01 ])/2) ×tmin ];
passive sensing terminal operating energy = Iop [ min ] × ((VDD [ type ] +vdd [ min ])/(2) ×t [ op ];
passive dynamic microwave driving energy=passive sensing terminal working energy=wmin ];
wherein, P [ tx_adjust01] is the quantity to be solved, the other parameters are known parameters or preset parameters, and the transmitting power meeting the requirement of the preset shortest working time interval is obtained:
。
as a further optimization, the microwave transceiver compares the value of P [ rx_op ] with P [ rx_start ] in real time to determine whether the position of the passive microwave direct-drive sensing terminal is changed, and when the position is changed, the microwave transceiver adjusts the transmitting power P [ tx_adjust01] until P [ rx_op ] =p [ rx_start ], specifically:
if P [ rx_op ] > 1.2 xP [ rx_start ], the distance between the passive microwave direct-drive sensing terminal and the microwave transceiver is determined to be obviously shortened, P [ tx_adjust01] is gradually reduced until P [ rx_op ] = P [ rx_start ], if P [ rx_op ] < 0.8 xP [ rx_start ], the distance between the passive microwave direct-drive sensing terminal and the microwave transceiver is determined to be obviously increased, P [ tx_adjust01] is gradually increased until P [ rx_op ] = P [ rx_start ].
As a further optimization, after the transmitting power of the microwave transceiver is adjusted to the maximum value, if the signal returned by the passive microwave direct-drive sensing terminal is not received after the duration of continuously exceeding 50 xTmin, the current passive microwave direct-drive sensing terminal is judged to be lost, and alarm information is sent out.
The beneficial effects of the invention are as follows:
on the one hand, under the prior art condition, as the mode of self-adaptive working according to the environmental microwave energy density is not available, the sensing terminal can only work in real time under the calibration power in the process of sensing environmental parameters, when the environmental microwave energy is affected by other factors (such as far distance, shielding and the like) and the working energy of the system cannot be reached, the system cannot work, and the invention can self-adaptively adjust the single working time T [ op ] and the interval time T [ min ] between the two working according to the microwave energy in the environment, so that the system can work under the microwave energy intensity of various conditions, and the distance of passive sensing communication is greatly improved;
on the other hand, under the condition of the prior art, the mode of self-adaptive work does not exist, the microwave energy density in the space is influenced by various factors, in order to ensure that the system can work normally as much as possible, a mode of maximum power is adopted to transmit microwave signals to the air, the mode greatly increases the microwave energy consumption, the power consumption consumed by the system can be up to 10% -30% higher than that consumed by the system in a traditional mode in a complex environment, and the passive microwave direct-drive sensing terminal in the system is deployed in a large quantity and in a wide range, so that the total energy consumption brought by a self-adaptive working mechanism is greatly reduced; meanwhile, the microwave transmitting power is relatively suitable, the improvement of electromagnetic wave radiation environment is facilitated, and unnecessary interference to other wireless facilities in a scene is reduced as much as possible.
Drawings
Fig. 1 is a schematic structural diagram of a remote passive microwave direct-drive adaptive sensing communication system in embodiment 1 of the present invention;
fig. 2 is a timing diagram of adaptive operation according to dynamic changes of various parameters such as distance, environmental impact, etc. in an actual scene in embodiment 2 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
The embodiment provides a remote passive microwave direct-drive self-adaptive sensing communication system, the structural composition schematic diagram of which is shown in fig. 1, wherein the system comprises a microwave transceiver and a passive microwave direct-drive sensing terminal, and the passive microwave direct-drive sensing terminal comprises a radio frequency signal matching network, an oscillation signal and energy collecting module, a power management module, an energy storage module, a low-power consumption MCU, a sensing module and a signal modulation module;
the microwave transceiver is used for transmitting microwave signals to a working scene, driving the passive microwave direct-drive sensing terminal to work, and simultaneously receiving and analyzing sensing information returned by the passive microwave direct-drive sensing terminal;
the radio frequency signal matching network is used for receiving the transmitted microwave signals transmitted by the microwave transceiver, filtering the transmitted microwave signals and acquiring microwave energy in the transmitted microwave signals;
the oscillating signal and energy collecting module is used for processing the microwave energy collected by the radio frequency signal matching network to form rectified energy which can be received by the power supply management module;
the power management module is used for collecting rectifying energy and adaptively driving the low-power consumption MCU and the sensing module to perform time-sharing work according to the state of the energy;
the energy storage module is used for collecting and releasing energy in cooperation with the power management module;
the sensing module is used for sensing various sensing information in the environment where the sensing module is located, such as temperature, vibration and the like;
the low-power consumption MCU is used for analyzing sensing information sensed by various sensors in the sensing module, performing analog-to-digital conversion processing on the sensing information and then sending the sensing information to the signal modulation module, wherein in the embodiment, the low-power consumption MCU defines the range that the average working power consumption is less than or equal to 100 mu W.
The signal modulation module is used for modulating the sensing information processed by the low-power MCU into a microwave signal and returning the microwave signal to the microwave transceiver.
Example 2
The embodiment 1 provides a remote passive microwave direct-drive self-adaptive sensing communication method, which comprises the following steps:
the microwave transceiver transmits a microwave signal with the maximum transmitting power P [ tx_100% ], the passive microwave direct-drive sensing terminal returns a response signal to the microwave transceiver, and the power value corresponding to the response signal is P [ rx_start ];
the microwave transceiver matches the transmitting power to P [ tx_adjust01] according to a preset shortest working time interval T [ min ] of the passive microwave direct-drive sensing terminal;
the passive microwave direct-drive sensing terminal starts to continuously work and returns corresponding working data to the microwave transceiver, and at the moment, the power of the passive microwave direct-drive sensing terminal received by the microwave transceiver is P [ rx_op ];
the microwave transceiver judges whether the position of the passive microwave direct-drive sensing terminal is changed according to the real-time comparison of the value of P [ rx_op ] and P [ rx_start ], and when the position of the passive microwave direct-drive sensing terminal is changed, the microwave transceiver adjusts the transmitting power P [ tx_adjust01] until P [ rx_op ] =P [ rx_start ];
if the microwave transceiver exceeds Tmin, the transmitting power of the microwave transceiver is regulated to the maximum and the microwave signal is transmitted outwards until the signal returned by the passive microwave direct-drive sensing terminal is received, and after the transmitting power of the microwave transceiver is regulated to the maximum and the microwave signal is transmitted outwards, if the signal returned by the passive microwave direct-drive sensing terminal is not received after the duration of continuously exceeding 50 xTmin, the alarm information is sent.
In a specific application process, referring to fig. 2, in fig. 2, a01 represents maximum transmission power transmission of a microwave transceiver P [ tx_100% ], a passive microwave direct-drive sensing terminal returns to P [ rx_start ], and a gateway adjusts the transmission power to P [ tx_adjust01] according to received information; a02 represents that normal operation is started under the condition of meeting T min; a03 represents that when the distance gets closer or other environmental changes cause the P [ rx ] to get larger, the microwave transceiver reduces the transmitting power to improve the energy efficiency; a04 represents that the microwave gateway gradually reduces the transmitting power according to a preset strategy until P [ rx ] =p [ rx_op ]; a05 represents that when the distance is far or P [ rx ] is small due to other environmental changes, the microwave transceiver increases the transmitting power to meet the normal operation; a06 represents that the microwave gateway gradually increases the transmitting power according to a given strategy until P [ rx ] =p [ rx_op ]; a07 shows that when the microwave transceiver exceeds T min and can not receive Prx, the transmitting power is maximized, until it is received, and when the full power transmission exceeds 50 xT min, the Prx is not received, and then an alarm is given to the system.
The remote passive microwave direct-drive self-adaptive sensing communication method of the embodiment is realized by the following specific steps:
s1, a microwave transceiver transmits a preset microwave signal to a passive microwave direct-drive sensing terminal, wherein the power of the microwave signal transmitted at the moment is 100%, and P is [ tx_start ];
s2, after receiving energy signals output by the radio frequency signal matching network, the oscillation signals and the energy converging module, the passive microwave direct-drive sensing terminal power management module starts to store, and after the energy reaches a working condition, the power management module returns signals to the transceiver at the first time;
s3, the characteristic parameters of the energy of the microwave direct-drive sensing terminal received by the microwave transceiver at the moment are as follows: power = P [ rx_start ];
s4, the microwave transceiver inquires and obtains an initial distance D [ rx_start ] between the microwave transceiver and the passive microwave direct-drive sensing terminal according to a preset corresponding table of power and distance;
s5, the microwave transceiver dynamically matches new transmitting power P [ tx_adjust01] according to the D [ rx_start ] and a preset shortest working time interval T [ min ] so as to meet the requirement of the preset shortest working time interval;
s6, after the passive microwave direct-drive sensing terminal receives the new P [ tx_adjust01], calculating and comparing the P [ rx_adjust 01] obtained after transmission with the power required by a preset shortest working time interval T [ min ], and if the power meets the requirement, starting to drive an energy storage module to store energy by a power management module in the passive microwave direct-drive sensing terminal;
s7, the power management module controls the time of power supply of the box energy storage module in real time, and determines the time of charging the energy storage module once and the interval of outputting energy outwards according to the relation between parameters such as the energy value W [ min ] required by the passive microwave direct drive sensing terminal for single operation, the working interval reaching the minimum time T [ min ], the single working time period T [ op ], the nominal working voltage VDD [ type ], the minimum working voltage VDD [ min ], the minimum working current Iop [ min ], and the like.
S8, according to the law of conservation of energy, the passive dynamic microwave driving energy is equal to the working energy of the passive sensing terminal, and the following formula can be obtained:
passive dynamic microwave driving energy= ((P [ tx_adjust01] +p [ rx_adjust 01 ])/2) ×tmin ];
passive sensing terminal operating energy = Iop [ min ] × ((VDD [ type ] +vdd [ min ])/(2) ×t [ op ];
passive dynamic microwave driving energy=passive sensing terminal working energy=wmin ];
in the formula: p [ tx_adjust01] is the quantity to be solved, and the rest is the known parameters or preset parameters of the system, and the dynamic transmitting power which is most suitable for the current working condition can be obtained according to the formula:
。
s9, the terminal starts to continuously work and returns corresponding working data to the transceiver, and at the moment, the power received by the transceiver is P [ rx_op ];
s10, the transceiver compares the value of the P [ rx_op ] with the P [ rx_start ] in real time to judge whether the position of the terminal is changed or not;
s11, if P [ rx_op ] > 1.2 xP [ rx_start ], judging that the distance is obviously shortened, gradually reducing P [ tx_adjust01] until P [ rx_op ] =P [ rx_start ], if P [ rx_op ] < 0.8 xP [ rx_start ], judging that the distance is obviously increased, gradually increasing P [ tx_adjust01] until P [ rx_op ] =P [ rx_start ];
and S12, the system starts to continuously work, if the transceiver exceeds T [ min ] and does not receive a terminal return signal, the first step is returned, the sensing terminal is not read for more than 50 times continuously, the sensing terminal is judged to be lost, and the system sends out alarm information.
Therefore, the passive microwave direct-drive sensing communication terminal can work in a self-adaptive mode under different conditions of distance, position, signal intensity, radio frequency energy level and the like, sensing communication functions under various working conditions are achieved, meanwhile, operation parameters of the whole working system can be automatically adjusted, the self-adaptive mode works under the optimal working condition, consumption of system energy can be greatly reduced, and unnecessary electromagnetic wave interference to the outside is reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The remote passive microwave direct-drive self-adaptive sensing communication system is characterized by comprising a microwave transceiver and a passive microwave direct-drive sensing terminal, wherein the passive microwave direct-drive sensing terminal comprises a radio frequency signal matching network, an oscillating signal and energy collecting module, a power management module, an energy storage module, a low-power consumption MCU, a sensing module and a signal modulation module;
the microwave transceiver is used for transmitting microwave signals to a working scene, driving the passive microwave direct-drive sensing terminal to work, and simultaneously receiving and analyzing sensing information returned by the passive microwave direct-drive sensing terminal;
the radio frequency signal matching network is used for receiving the transmitted microwave signals transmitted by the microwave transceiver, filtering the transmitted microwave signals and acquiring microwave energy in the transmitted microwave signals;
the oscillating signal and energy collecting module is used for processing the microwave energy collected by the radio frequency signal matching network to form rectified energy which can be received by the power supply management module;
the power management module is used for collecting rectifying energy and adaptively driving the low-power consumption MCU and the sensing module to perform time-sharing work according to the state of the energy;
the energy storage module is used for collecting and releasing energy in cooperation with the power management module;
the sensing module is used for sensing various different sensing information in the environment where the sensing module is located;
the low-power consumption MCU is used for analyzing sensing information sensed by various sensors in the sensing module, performing analog-to-digital conversion on the sensing information and then sending the sensing information to the signal modulation module;
the signal modulation module is used for modulating the sensing information processed by the low-power MCU into a microwave signal and returning the microwave signal to the microwave transceiver.
2. The remote passive microwave direct-drive self-adaptive sensing communication method is applied to the remote passive microwave direct-drive self-adaptive sensing communication system as claimed in claim 1, and is characterized by comprising the following steps:
the microwave transceiver transmits a microwave signal with the maximum transmitting power P [ tx_100% ], the passive microwave direct-drive sensing terminal returns a response signal to the microwave transceiver, and the power value corresponding to the response signal is P [ rx_start ];
the microwave transceiver matches the transmitting power to P [ tx_adjust01] according to a preset shortest working time interval T [ min ] of the passive microwave direct-drive sensing terminal;
the passive microwave direct-drive sensing terminal starts to continuously work and returns corresponding working data to the microwave transceiver, and at the moment, the power of the passive microwave direct-drive sensing terminal received by the microwave transceiver is P [ rx_op ];
the microwave transceiver judges whether the position of the passive microwave direct-drive sensing terminal is changed according to the real-time comparison of the value of P [ rx_op ] and P [ rx_start ], and when the position of the passive microwave direct-drive sensing terminal is changed, the microwave transceiver adjusts the transmitting power P [ tx_adjust01] until P [ rx_op ] =P [ rx_start ];
if the microwave transceiver exceeds Tmin, the transmitting power of the microwave transceiver is regulated to the maximum and the microwave signal is transmitted outwards until the signal returned by the passive microwave direct-drive sensing terminal is received, and after the transmitting power of the microwave transceiver is regulated to the maximum and the microwave signal is transmitted outwards, if the signal returned by the passive microwave direct-drive sensing terminal is not received after the duration of continuously exceeding 50 xTmin, the alarm information is sent.
3. The remote passive microwave direct-drive adaptive sensing communication method according to claim 2, wherein the passive microwave direct-drive sensing terminal returns a response signal to the microwave transceiver, specifically:
after the passive microwave direct-drive sensing terminal receives the microwave signal, the power management module of the passive microwave direct-drive sensing terminal receives the energy signal output by the radio frequency signal matching network, the oscillation signal and the energy converging module and starts to store the energy signal, and after the energy reaches the condition that the passive microwave direct-drive sensing terminal can work, a response signal is returned to the microwave transceiver.
4. The method for remotely and directly driving and adaptively sensing the microwave according to claim 2, wherein the microwave transceiver matches the transmission power to P [ tx_adjust01] according to the shortest operation time interval T [ min ] of the passive microwave directly driving and sensing terminal, specifically:
after receiving a response signal returned by the passive microwave direct-drive sensing terminal, the microwave transceiver reads a power value P [ rx_start ] corresponding to the response signal;
the microwave transceiver inquires and obtains an initial distance D [ rx_start ] between the microwave transceiver and the passive microwave direct-drive sensing terminal based on the read P [ rx_start ] and by combining a preset power and distance corresponding table;
the microwave transceiver dynamically matches the transmit power Ptx_adjust 01 according to Drx_start and Tmin to meet the requirement of the preset minimum operation time interval.
5. The method of claim 4, wherein after receiving the microwave signal with the transmission power matched to P tx_adjust01, the passive microwave direct-drive sensing terminal performs calculation and comparison between P rx_adjust 01 obtained after transmission and power required by a preset shortest working time interval T min, and if the requirement is met, a power management module in the passive microwave direct-drive sensing terminal starts to drive an energy storage module to start energy storage.
6. The method for remotely and directly driving and adaptively sensing the microwave direct-drive communication according to claim 5, wherein after the power management module in the passive microwave direct-drive sensing terminal starts to drive the energy storage module to start energy storage, the power management module controls the time for supplying power to the energy storage module in real time, and determines the time for charging the energy storage module once and the interval for outputting energy to the outside according to the relationship among the energy value W [ min ], the minimum time T [ min ] for the working interval, the single working time T [ op ], the nominal working voltage VDD [ type ], the minimum working voltage VDD [ min ] and the minimum working current Iop [ min ] required by the single working of the passive microwave direct-drive sensing terminal.
7. The method for remotely and passively directly driving and adaptively sensing and communicating according to claim 6, wherein the microwave transceiver dynamically matches the transmission power P [ tx_adjust01] to meet the requirement of the preset minimum operation time interval according to D [ rx_start ] and T [ min ], specifically:
defining the energy value W [ min ] required by single operation of the passive microwave direct-drive sensing terminal as the working energy of the passive sensing terminal, defining the energy of a microwave signal transmitted by a microwave transmitter as passive dynamic microwave driving energy, and according to the law of conservation of energy, the passive dynamic microwave driving energy is equal to the working energy of the passive sensing terminal, namely:
passive dynamic microwave driving energy= ((P [ tx_adjust01] +p [ rx_adjust 01 ])/2) ×tmin ];
passive sensing terminal operating energy = Iop [ min ] × ((VDD [ type ] +vdd [ min ])/(2) ×t [ op ];
passive dynamic microwave driving energy=passive sensing terminal working energy=wmin ];
wherein, P [ tx_adjust01] is the quantity to be solved, the other parameters are known parameters or preset parameters, and the transmitting power meeting the requirement of the preset shortest working time interval is obtained:
。
8. the method of claim 2, wherein the microwave transceiver compares the value of P [ rx_op ] with P [ rx_start ] in real time to determine whether the position of the passive microwave direct-drive sensing terminal is changed, and when the position is changed, the microwave transceiver adjusts the transmitting power P [ tx_adjust01] until P [ rx_op ] =p [ rx_start ], specifically:
if P [ rx_op ] > 1.2 xP [ rx_start ], the distance between the passive microwave direct-drive sensing terminal and the microwave transceiver is determined to be obviously shortened, P [ tx_adjust01] is gradually reduced until P [ rx_op ] = P [ rx_start ], if P [ rx_op ] < 0.8 xP [ rx_start ], the distance between the passive microwave direct-drive sensing terminal and the microwave transceiver is determined to be obviously increased, P [ tx_adjust01] is gradually increased until P [ rx_op ] = P [ rx_start ].
9. The method for remotely and directly driving and adaptively sensing and communicating by using passive microwaves according to claim 2, wherein after the transmission power of the microwave transceiver is adjusted to the maximum value, if the signal returned by the passive microwave direct-driving sensing terminal is not received after the duration of continuously exceeding 50 xT min, the current passive microwave direct-driving sensing terminal is judged to be lost, and alarm information is sent out.
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