CN110855301A - Half-duplex multi-band antenna control system and method for terminal of Internet of things - Google Patents
Half-duplex multi-band antenna control system and method for terminal of Internet of things Download PDFInfo
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Abstract
The invention provides a half-duplex multi-band antenna control system and method for an Internet of things terminal. The control system comprises a plurality of antennas, each antenna is connected with a half-duplex bidirectional radio frequency amplification module, the antennas are used for receiving radio frequency signals of a preset frequency band and transmitting the radio frequency signals to the corresponding half-duplex bidirectional radio frequency amplification modules, each antenna is connected with a single-pole multi-throw switch, the single-pole multi-throw switches are connected with a digital voltage-adjustable control attenuator, and the digital voltage-adjustable control attenuator is connected with a broadband amplification module; the control logic of the half-duplex bidirectional radio frequency amplification module is consistent with that of the single-pole multi-throw switch.
Description
Technical Field
The disclosure belongs to the field of half-duplex multi-band antenna control, and particularly relates to a half-duplex multi-band antenna control system and method for an Internet of things terminal.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The antenna is an indispensable device in wireless devices, and the nature of the antenna is an energy conversion device that converts electrical signals into electromagnetic waves or vice versa. The inventor finds that the existing ultra-wideband antenna covering the frequency band of the Internet of things has the problems of uneven gain, large size and high price.
Disclosure of Invention
In order to solve the above problems, the present disclosure provides a half-duplex multiband antenna control system and method for an internet of things terminal, which have the advantages of small size, flat in-band gain, strong expansibility, and the like.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a first aspect of the present disclosure provides a half-duplex multiband antenna control system for an internet of things terminal, including:
each antenna is connected with a half-duplex bidirectional radio frequency amplification module, is used for receiving radio frequency signals of a preset frequency band and transmitting the radio frequency signals to the corresponding half-duplex bidirectional radio frequency amplification module, and is connected with a single-pole multi-throw switch, the single-pole multi-throw switch is connected with a digital voltage-adjustable control attenuator, and the digital voltage-adjustable control attenuator is connected with a broadband amplification module; the control logic of the half-duplex bidirectional radio frequency amplification module is consistent with that of the single-pole multi-throw switch.
As an embodiment, the half-duplex bidirectional rf amplifying module includes:
one end of the radio frequency band-pass filter is grounded, and the other end of the radio frequency band-pass filter is connected with the fixed end of the first single-pole double-throw switch; the control end of the first single-pole double-throw switch is connected with the output end of the phase inverter, and the input end of the phase inverter is connected with the receiving and transmitting control signal end; the first active end of the first single-pole double-throw switch is connected with the first control logic device and the first active end of the second single-pole double-throw switch; the second active end of the first single-pole double-throw switch is connected with the second active end of the second single-pole double-throw switch through the second control logic device; the control ends of the first control logic device and the second control logic device are respectively connected with the output ends of the first and logic device and the second and logic device, and the output ends of the first and logic device and the second and logic device are enabled when being at low level, so that the signals of the corresponding active ends of the two single-pole double-throw switches are communicated; the first output end of the first AND logic device is connected with the output end of the phase inverter, and the second output end of the first AND logic device is connected with the enabling signal end of the half-duplex bidirectional radio frequency amplification module; the first output end of the second AND logic device is connected with the enabling signal end of the half-duplex bidirectional radio frequency amplification module, and the second output end of the second AND logic device is connected with the input end of the phase inverter.
In one embodiment, the gating of the single-pole multi-throw switch is controlled by a multiplexer and decoder combination.
In one embodiment, the attenuation of the digitally variable voltage controlled attenuator is controlled by a plurality of multiplexers connected in parallel.
As an embodiment, the broadband amplification module includes:
the fixed end of the third single-pole double-throw switch is connected with the digital voltage-adjustable control attenuator, the first movable end of the third single-pole double-throw switch is connected with the first movable end of the fourth single-pole double-throw switch, the second movable end of the third single-pole double-throw switch is connected with the first movable end of the fifth single-pole double-throw switch, the fixed end of the fourth single-pole double-throw switch is connected with the input end of the broadband radio-frequency low-noise amplifier, the fixed end of the fifth single-pole double-throw switch is connected with the output end of the broadband radio-frequency low-noise amplifier, and the second movable ends of the fourth single-pole double-throw switch and the fifth single-pole double-throw switch are correspondingly connected with the first movable end and the second movable end of the sixth single-pole double-throw switch through corresponding controllable varistors; the fixed end of the sixth single-pole double-throw switch is connected with the two directional couplers and then grounded; the output end of the directional coupler is grounded through a detector, a comparator and an inverter in sequence.
As an implementation manner, the control terminal of the half-duplex bidirectional rf amplifying module is connected to a microprocessor, and the microprocessor is responsible for detecting the system status and signal strength, and closing the corresponding rf channel when the received/transmitted signal exceeds the warning value.
As an implementation mode, the microprocessor is connected with the upper computer through a serial port.
In one embodiment, the working frequencies of the antennas connected with the half-duplex bidirectional radio frequency amplification module are consistent.
A second aspect of the disclosure provides a control method of a half-duplex multi-band antenna control system for an internet of things terminal, which includes a manual mode, wherein the manual mode is used for calibration and parameter acquisition; in the manual mode, the microprocessor is in a monitoring state, is responsible for detecting the system state and the signal strength, and closes the corresponding radio frequency channel when the received/transmitted signal exceeds the early warning value.
As an implementation manner, the control method of the half-duplex multi-band antenna control system facing the terminal of the internet of things further comprises an automatic mode, after the microprocessor is started, the microprocessor detects that the communication voltage from the serial port to the first is high level, sets the level of a corresponding pin, and when the microprocessor is in a normal working state, performs corresponding operation according to an instruction sent by an upper computer.
The beneficial effects of this disclosure are:
this disclose can realize convenient full frequency channel thing networking antenna system through different frequency channel antenna module switch, and keep the gain unanimous in whole frequency channel, solve the problem that lacks small-size high performance ultra wide band antenna among the wireless safety inspection of present thing networking, provide high performance low-cost solution for the wireless safety inspection antenna system of thing networking.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a structural schematic diagram of a half-duplex multiband antenna control system for an internet of things terminal according to an embodiment of the present disclosure.
Fig. 2 is a structural schematic diagram of a half-duplex bidirectional rf amplifying module according to an embodiment of the disclosure.
Fig. 3(a) is a structural schematic of the encoder switch 1 of the embodiment of the present disclosure.
Fig. 3(b) is a structural schematic of the encoder switch 2 of the embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a connection between a microprocessor and a serial port of an upper computer according to an embodiment of the present disclosure.
Fig. 5 is a schematic diagram of a level conversion module in which a microprocessor and an upper computer are connected in series according to an embodiment of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the half-duplex multiband antenna control system for the terminal of the internet of things of the present embodiment includes:
each antenna is connected with a half-duplex bidirectional radio frequency amplification module, is used for receiving radio frequency signals of a preset frequency band and transmitting the radio frequency signals to the corresponding half-duplex bidirectional radio frequency amplification module, and is connected with a single-pole multi-throw switch, the single-pole multi-throw switch is connected with a digital voltage-adjustable control attenuator, and the digital voltage-adjustable control attenuator is connected with a broadband amplification module; the control logic of the half-duplex bidirectional radio frequency amplification module is consistent with that of the single-pole multi-throw switch.
Wherein the gating of the single-pole multi-throw switch is controlled by a multiplexer and decoder combination.
The attenuation of the digital variable-voltage control attenuator is controlled by a plurality of multiplexers connected in parallel.
As shown in fig. 2, the half-duplex bidirectional rf amplifying module includes:
one end of the radio frequency band-pass filter is grounded, and the other end of the radio frequency band-pass filter is connected with the fixed end of the first single-pole double-throw switch; the control end of the first single-pole double-throw switch SPDTa is connected with the output end of the phase inverter, and the input end of the phase inverter is connected with the receiving and transmitting control signal end; the first active end of the first SPDTa is connected with the first control logic device and the first active end of the second SPDTb; the second active end of the first single-pole double-throw switch SPDTa is connected with the second active end of the second single-pole double-throw switch SPDTb through the second control logic device; the control ends of the first control logic device LNA and the second control logic device PA are respectively connected with the output ends of the first and logic device and the second and logic device, and the output ends of the first and logic device and the second and logic device are enabled when being at low level, so that the signals of the corresponding active ends of the two single-pole double-throw switches are communicated; the first output end of the first AND logic device is connected with the output end of the phase inverter, and the second output end of the first AND logic device is connected with the enabling signal end of the half-duplex bidirectional radio frequency amplification module; the first output end of the second AND logic device is connected with the enabling signal end of the half-duplex bidirectional radio frequency amplification module, and the second output end of the second AND logic device is connected with the input end of the phase inverter.
As an embodiment, as shown in fig. 4, the control terminal of the half-duplex bidirectional rf amplifying module is connected to a microprocessor, and the microprocessor is responsible for detecting the system status and signal strength, and closing the corresponding rf channel when the received/transmitted signal exceeds the warning value.
As an implementation mode, the microprocessor is connected with the upper computer through a serial port. As shown in fig. 5, the level conversion module includes two modules with energy management and two triodes, an emitter of the triode Q1 is grounded and connected with a collector of the triode Q2, an emitter of the triode Q2 and a collector of the triode Q2 are respectively connected through corresponding resistors and then grounded, and a level of the emitter of the triode Q2 is a serial level CTRL.
In one embodiment, the working frequencies of the antennas connected with the half-duplex bidirectional radio frequency amplification module are consistent.
The control method of the half-duplex multi-band antenna control system for the terminal of the internet of things comprises a manual mode, wherein the manual mode is used for calibration and parameter acquisition; in the manual mode, the microprocessor is in a monitoring state, is responsible for detecting the system state and the signal strength, and closes the corresponding radio frequency channel when the received/transmitted signal exceeds the early warning value.
As another embodiment, the control method of the half-duplex multi-band antenna control system facing the terminal of the internet of things further comprises an automatic mode, after the microprocessor is started, the microprocessor detects that the communication voltage from the serial port to the first is high level, sets the level of the corresponding pin, and when the microprocessor is in a normal working state, performs corresponding operation according to an instruction sent by the upper computer.
The host computer in this embodiment takes a computer (PC) as an example:
the computer sends a command through the serial port to control the half-duplex multi-band antenna control system facing the terminal of the Internet of things. And the corresponding functions are completed by matching with a frequency spectrograph/a wireless module.
The half-duplex multi-band antenna control system for the terminal of the Internet of things supports a manual operation mode, and a computer is not needed in the manual operation mode; while this mode is used for system calibration and parameter acquisition.
In fig. 1, the broadband amplification module includes:
a fixed end of the third single-pole double-throw switch SPDT1 is connected with the digital voltage-adjustable control attenuator, a first movable end of the third single-pole double-throw switch SPDT1 is connected with a first movable end of the fourth single-pole double-throw switch, a second movable end of the third single-pole double-throw switch SPDT1 is connected with a first movable end of the fifth single-pole double-throw switch, a fixed end of the fourth single-pole double-throw switch SPDT2 is connected with an input end of a broadband radio frequency low noise amplifier, a fixed end of the fifth single-pole double-throw switch SPDT3 is connected with an output end of the broadband radio frequency low noise amplifier, and second movable ends of the fourth single-pole double-throw switch SPDT2 and the fifth single-pole double-throw switch SPDT3 are correspondingly connected with a first movable end and a second movable end of the sixth single-pole double-throw switch SPDT4 through corresponding controllable varistors; the fixed end of the sixth single-pole double-throw switch SPDT4 is connected with the two directional couplers and then grounded; the output end of the directional coupler is grounded through a detector, a comparator and an inverter in sequence.
The broadband amplification module has 1 single-pole double-throw switch SPDT1, 3 self-locking switches SPDT2, SPDT3, SPDT4, and corresponding controllable varistors connected to the second active terminals of the fourth single-pole double-throw switch SPDT2 and the fifth single-pole double-throw switch SPDT3 respectively corresponding to the two dip switches, as shown in fig. 3(a) and 3 (b).
After the broadband amplification module is powered on, the SPDT1 needs to be connected with 1 bit or 2 bits first. Drive SPDT1 to the 0 bit shutdown module.
In bit 2, automatic mode is selected, CTRL is high, U1 is enabled, and VDD is output. The system receives the serial port instruction and sends the system state, signal strength and other information to the computer through the serial port.
When the SPDT2 is off, the manual reception/transmission control signal is output: tr1 is 0 volts. Defaulting to a receiving mode;
when the SPDT3 is off, the manual enable control signal output: en1 is 0 volts. The default is disabled.
When the SPDT4 is off, the manual power selection control signal to be output: st1 is high.
The U4-U6 outputs control SP8T switch selection and 3: and 8, outputting by the decoder, and combining and controlling the radio frequency channels.
The radio frequency channel selection truth table is as follows:
and U9-U12 are used for controlling the attenuation of the digital voltage-adjustable control attenuator.
When the system sequentially illustrates the automatic mode and manual mode workflows:
1) manual mode:
first, SPDT3 is turned off.
CTRL is low at this time. The inputs of the multiplexers U4-U12 select the x1 input. I.e., the output level x1 level.
After the microprocessor is started, the CTRL voltage is detected to be low firstly, and pins en0, tr0, a0, b0, c0, d0, e0, f0 and g0 are set to be low. Then the sts pin is set to high level, and the detection circuit is started. The microprocessor is in a listening state.
The corresponding radio frequency amplification module is selected to be in a working state by setting the gear of the coding switch 1, and other radio frequency amplification modules are in a closed state.
Setting the gear of the coding switch 2 sets the attenuation value of the digital adjustable voltage-controlled attenuator.
The disconnected or connected SPDT2 sets the system in a receive/transmit state.
Then the SPDT3 is connected and the system is in normal operation.
When the system is in a receiving state, the radio frequency signal received by the radio frequency amplification module corresponding to the radio frequency port in the receiving state is received, and the radio frequency signal is amplified by the broadband amplifier module and then output from the A port. And the microprocessor detects the level of the det0 pin in real time and displays the level on an LCD display screen of the upper computer.
When the system is in a transmitting state, the radio frequency signal input from the port A is received, amplified by the broadband amplifier module, amplified by the radio frequency amplification module in the transmitting state and output from the corresponding radio frequency port. And the microprocessor detects the level of a detx pin and the level of a det9 pin corresponding to the radio frequency amplification module in a transmitting state in real time and displays the levels on an LCD display screen of the upper computer.
The half-duplex bidirectional radio frequency amplification module or the antenna connected with the radio frequency amplification module is required to ensure that the working frequency of the radio frequency amplification module is consistent with that of the half-duplex bidirectional radio frequency amplification module or the antenna.
2) Automatic mode: CTRL is at a high level at this time. If the SPDT4 is turned off, str1 is high, the microprocessor power supply is selected to be VDD; otherwise, the power supply of the microprocessor is selected to be VCC. Wherein, 2: the 1-multiplexer U4-U12 selects x0 as input. I.e., the output level x0 level.
After the microprocessor is started, the CTRL voltage is detected to be high firstly, pins en0, tr0, a0, b0, c0, d0, e0, f0 and g0 are set to be low, and then pins sts are set to be high, so that the detection circuit is started. The microprocessor is in a normal working state, and performs corresponding operation according to an instruction sent by the PC terminal, and the pins are shown in fig. 1.
The attenuation value setting and power detection calibration method is as follows:
(a) receiving state:
and (3) disconnecting the SPDT3, setting the antenna system to be in a receiving state, setting the attenuation value of the digital voltage-adjustable control attenuator DA to be 0, sequentially connecting the radio-frequency signal transmitting port of the vector analyzer with each radio-frequency amplification module, and connecting the radio-frequency signal receiving port of the vector analyzer with the A port of the broadband amplification module. Then connecting SPDT3, adjusting the transmitting power to the set value, then sweeping the frequency in the working frequency band of each half-duplex bidirectional radio frequency amplification module and recording the gain in the whole frequency band. And calculating the average gain value of different transmitting powers in the working frequency band and recording the average gain value as the reference receiving gain of the antenna system in the state.
After all the module reference receiving gains GainMRx are obtained, the minimum gain value is set as the reference gain RefGainRx. The corresponding attenuation value is 0; and calculating the attenuation value AttMRx corresponding to each module as GainMRx-RefGainRx, and selecting the attenuation value AttnRx with the closest DA and inputting the attenuation value AttnRx.
Finally, the software adjusted attenuation value AdjAttnRx is AttnRx-AttMRx.
And (3) receiving power detection calibration:
in a receiving state, the radio frequency output port of the vector network analyzer is connected with the B port of each half-duplex bidirectional radio frequency amplification module in sequence, the A port of the broadband amplification module is connected with the radio frequency input interface of the vector network analyzer, and the det0 pin is output and connected with the oscilloscope. Respectively setting the intensity of radio frequency signals to-70 dbm, -60dbm, -50dbm, -40dbm, -30dbm, -20dbm, then sweeping frequency in the working frequency band of each half-duplex bidirectional radio frequency amplification module, and recording the output voltage, the corresponding frequency, the input power and the output power of a det0 pin in the whole frequency band. And calculating the average input power and the average voltage of the frequency band. And establishing a reference table of the received power voltage.
The working process of the receiving state of the antenna module comprises the following steps:
after the PC sends an antenna module selection instruction, the microprocessor starts the corresponding half-duplex bidirectional radio frequency amplification module according to the radio frequency channel selection truth table, meanwhile, the microprocessor checks the table to obtain DA input, and sets d0, d1, d2 and d3 as corresponding values. And simultaneously, looking up a table to obtain a software adjustment attenuation value AdjAttnRx, and outputting the AdjAttnRx to a PC (personal computer). en0 outputs a high level.
Meanwhile, the microprocessor starts the ADC module, continuously measures the voltage value of det1 and sends the voltage value to the PC through the serial port.
When the strength of the radio frequency signal exceeds the early warning value, the output of E1 is low level, and the antenna module automatically closes the radio frequency channel. The microprocessor sets en0 low when it detects the low level of E1 and sends an rf signal strength alarm packet to the PC. After the radio frequency channel is closed, E1 will return to high level, and after the microprocessor detects E1 high level, it will send radio frequency signal intensity normal data packet to PC regularly. After the PC end sends an instruction for starting the half-duplex bidirectional radio frequency amplification module, the microprocessor sets the en0 to be high level to open the radio frequency path. Meanwhile, the half-duplex bidirectional radio frequency amplification module sends a radio frequency channel starting instruction to the PC, and the system is recovered to a receiving state.
(b) And (3) sending state:
firstly, an antenna system is set to be in a sending state, the attenuation value of a digital voltage-adjustable control attenuator DA is set to be 0, a radio-frequency signal transmitting port of a vector analyzer is connected with an A port of a broadband amplifier module, and a radio-frequency signal receiving port of the vector analyzer is connected with each radio-frequency amplification module. And adjusting the transmitting power to a set value, then sweeping the frequency in the working frequency band of each half-duplex bidirectional radio frequency amplification module and recording the gain in the whole frequency band. And calculating the average gain value of different transmitting powers in the working frequency band and recording the average gain value as the reference transmitting gain of the antenna system in the state.
After all the module reference transmission gains GainMTx are obtained, the minimum gain value is set as the reference gain RefGainTx. The corresponding attenuation value is 0; the attenuation value AttMTx corresponding to each module is calculated as GainMTx-RefGainTx, and the attenuation value attnttx closest to the DA is selected and input to the selected attenuation value AttMTx.
Finally, the software adjusted transmission attenuation value adjattnttx ═ attnttx-AttMTx is obtained.
(c) And (3) transmitting power detection calibration:
in a transmitting state, sequentially connecting a radio frequency output port of the vector network analyzer with an A port of the broadband amplifier module, connecting a radio frequency input interface of the vector network analyzer with a 60db attenuator, then connecting the radio frequency input interface of the vector network analyzer with B ports of the radio frequency amplification modules, and outputting and connecting detx and det9 pins corresponding to the amplification modules with an oscilloscope. The radio frequency signal intensity is respectively set to be-20 dbm, -10dbm,0dbm and 10dbm, then frequency sweeping is carried out in the working frequency band of each half-duplex bidirectional radio frequency amplification module, and the output voltage, the corresponding frequency, the input power and the output power of the detx pin and the det9 pin in the whole frequency band are recorded. And calculating the average input power and the average voltage of the frequency band. And establishing a transmission power voltage reference table.
(d) Emission state workflow:
after the PC sends an antenna module selection instruction, the microprocessor starts the corresponding radio frequency amplification module according to the radio frequency channel selection truth table, meanwhile, the microprocessor checks the table to obtain DA input, and sets d0, d1, d2 and d3 as corresponding values. And simultaneously, looking up a table to obtain a software adjustment attenuation value AdjAttnTx, and outputting the AdjAttnTx to the PC. en0 outputs a high level.
Meanwhile, the microprocessor starts the ADC module, continuously measures the voltage value of det9 and the detx voltage value corresponding to the radio frequency amplification module and sends the detx voltage value to the PC through the serial port.
When the strength of the radio frequency signal exceeds the early warning value, the output of E1 is low level, the antenna module automatically closes the radio frequency channel, and the system is in an abnormal state. The microprocessor sets en0 low when it detects the low level of E1 and sends an rf signal strength alarm packet to the PC. After the radio frequency channel is closed, E1 will return to high level, and after the microprocessor detects E1 high level, it will send radio frequency signal intensity normal data packet to PC regularly. After the PC sends an instruction for starting the half-duplex bidirectional radio frequency amplification module, the microprocessor sets the en0 to be high level to open the radio frequency path. Meanwhile, the half-duplex bidirectional radio frequency amplification module sends a radio frequency channel starting instruction to the PC, and the system is recovered to a transmitting state.
(e) Switching between a transmitting state and a receiving state:
after the PC sends the antenna state setting instruction, if the antenna system is in the system abnormal state, no processing is carried out. Otherwise the micro-process sets tr0 to the corresponding level.
(f) Full frequency channel wireless signal detection flow:
the system is powered up, defaults to standby, and en0 outputs 0.
The PC sends an antenna state setting instruction: a status is received. The microprocessor firstly sets tr0 to 0, sets the system module to a receiving state, and sends a response packet: the system is in a receive state.
And step 0, after receiving the response data packet, the PC sets the current antenna to be the antenna No. 0.
And 2.1, the antenna system detects the output of the det0 pin, looks up the table to obtain the corresponding signal strength, displays the real-time signal strength on an LCD, and sends a signal captured data packet to a PC (personal computer) end if the signal strength exceeds the set threshold voltage of the received signal.
And 2.2, receiving and processing the radio frequency signal of the antenna system by the PC radio frequency signal monitoring software, numbering the antenna after the frequency band processing is finished and turning to the step 3 if all the antennas are processed, or turning to the step 1.
And step 3: the PC sends a detection completion instruction to the microprocessor. The microprocessor sets the en0 output to 0, closing the rf path.
This embodiment switches through different frequency channel antenna module and can realize convenient full frequency channel thing networking antenna system, and keeps the gain unanimous in whole frequency channel, solves the problem that lacks small-size high performance ultra wide band antenna among the wireless safety inspection of present thing networking, provides high performance low-cost solution for the wireless safety inspection antenna system of thing networking.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The utility model provides a half duplex multifrequency section antenna control system towards thing networking terminal which characterized in that includes:
each antenna is connected with a half-duplex bidirectional radio frequency amplification module, is used for receiving radio frequency signals of a preset frequency band and transmitting the radio frequency signals to the corresponding half-duplex bidirectional radio frequency amplification module, and is connected with a single-pole multi-throw switch, the single-pole multi-throw switch is connected with a digital voltage-adjustable control attenuator, and the digital voltage-adjustable control attenuator is connected with a broadband amplification module; the control logic of the half-duplex bidirectional radio frequency amplification module is consistent with that of the single-pole multi-throw switch.
2. The internet-of-things terminal-oriented half-duplex multiband antenna control system of claim 1, wherein the half-duplex bidirectional radio frequency amplification module comprises:
one end of the radio frequency band-pass filter is grounded, and the other end of the radio frequency band-pass filter is connected with the fixed end of the first single-pole double-throw switch; the control end of the first single-pole double-throw switch is connected with the output end of the phase inverter, and the input end of the phase inverter is connected with the receiving and transmitting control signal end; the first active end of the first single-pole double-throw switch is connected with the first control logic device and the first active end of the second single-pole double-throw switch; the second active end of the first single-pole double-throw switch is connected with the second active end of the second single-pole double-throw switch through the second control logic device; the control ends of the first control logic device and the second control logic device are respectively connected with the output ends of the first and logic device and the second and logic device, and the output ends of the first and logic device and the second and logic device are enabled when being at low level, so that the signals of the corresponding active ends of the two single-pole double-throw switches are communicated; the first output end of the first AND logic device is connected with the output end of the phase inverter, and the second output end of the first AND logic device is connected with the enabling signal end of the half-duplex bidirectional radio frequency amplification module; the first output end of the second AND logic device is connected with the enabling signal end of the half-duplex bidirectional radio frequency amplification module, and the second output end of the second AND logic device is connected with the input end of the phase inverter.
3. The internet-of-things terminal-oriented half-duplex multiband antenna control system of claim 1, wherein the gating of the single-pole-multiple-throw switch is controlled by a multiplexer and decoder combination.
4. The internet-of-things-oriented terminal half-duplex multiband antenna control system of claim 1, wherein the attenuation of the digitally variable voltage controlled attenuator is controlled by a plurality of multiplexers connected in parallel.
5. The internet-of-things terminal-oriented half-duplex multiband antenna control system of claim 1, wherein the broadband amplification module comprises:
the fixed end of the third single-pole double-throw switch is connected with the digital voltage-adjustable control attenuator, the first movable end of the third single-pole double-throw switch is connected with the first movable end of the fourth single-pole double-throw switch, the second movable end of the third single-pole double-throw switch is connected with the first movable end of the fifth single-pole double-throw switch, the fixed end of the fourth single-pole double-throw switch is connected with the input end of the broadband radio-frequency low-noise amplifier, the fixed end of the fifth single-pole double-throw switch is connected with the output end of the broadband radio-frequency low-noise amplifier, and the second movable ends of the fourth single-pole double-throw switch and the fifth single-pole double-throw switch are correspondingly connected with the first movable end and the second movable end of the sixth single-pole double-throw switch through corresponding controllable varistors; the fixed end of the sixth single-pole double-throw switch is connected with the two directional couplers and then grounded; the output end of the directional coupler is grounded through a detector, a comparator and an inverter in sequence.
6. The internet-of-things terminal-oriented half-duplex multiband antenna control system of claim 1, wherein the control terminal of the half-duplex bidirectional rf amplification module is connected to a microprocessor, the microprocessor is responsible for detecting system status and signal strength, and closes the corresponding rf channel when a received/transmitted signal exceeds an early warning value.
7. The internet-of-things terminal-oriented half-duplex multiband antenna control system of claim 6, wherein the microprocessor is connected with the upper computer through a serial port.
8. The internet-of-things terminal-oriented half-duplex multiband antenna control system of claim 1, wherein the operating frequencies of antennas connected to the half-duplex bidirectional radio frequency amplification module are consistent.
9. The control method of the half-duplex multiband antenna control system for the terminal of the internet of things according to any one of claims 1 to 8, characterized in that the control method of the half-duplex multiband antenna control system for the terminal of the internet of things comprises a manual mode, wherein the manual mode is used for calibration and parameter acquisition; in the manual mode, the microprocessor is in a monitoring state, is responsible for detecting the system state and the signal strength, and closes the corresponding radio frequency channel when the received/transmitted signal exceeds the early warning value.
10. The method for controlling the half-duplex multi-band antenna control system for the terminal of the internet of things as claimed in claim 9, wherein the method for controlling the half-duplex multi-band antenna control system for the terminal of the internet of things further comprises an automatic mode, wherein after the microprocessor is started, the microprocessor detects that the first-to-serial communication voltage is high level, sets the level of a corresponding pin, and performs corresponding operation according to an instruction sent by the upper computer when the microprocessor is in a normal working state.
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