WO2018191985A1 - Radio frequency control system and control method - Google Patents

Abstract

A radio frequency control system, comprising a first detection circuit (2), a first pulse processing circuit (3) and a controller (4), the first detection circuit (2) being used for converting a received radio frequency signal into a direct current signal and sending same to the first pulse processing circuit (3), the first pulse processing circuit (3) being used for performing analog-to-digital conversion of the direct current signal to obtain a digital pulse signal and send same to the controller (4), the controller (4) being used for calculating the power of the received pulse signal to obtain the actual power value of the radio frequency signal, and generating, according to the comparison result between the actual power value and a target output power value, a pre-set instruction and sending same to a radio frequency signal transmission terminal, so as to adjust the transmission power of subsequent radio frequency signals. The radio frequency control system can control the output power of radio frequency signals of different modes, improving the adaptive range of the control system.

Description

Radio frequency control system and control method Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a radio frequency power control system and method.

Background technique

With the popularity of civilian drones, there is a need for stable two-way communication between users and drones, which imposes higher reliability requirements on RF systems.

The above radio frequency system includes a transmitter and a receiver. The transmitter is responsible for frequency-modulating the baseband signal to a high-frequency signal, and then transmitting it to the free space through the antenna; the receiver receives the radio frequency signal from the free space, and down-converts and demodulates to the baseband signal, thereby realizing the transmission of the signal in free space. Therefore, the radio frequency system is the basis of the entire wireless communication system, and the reliability of the radio frequency control system is the basis for ensuring the normal operation of the wireless communication system.

The RF control system has functions such as power control and transmission/reception status monitoring. Under normal circumstances, in order to ensure the coverage effect of the wireless communication system, the relay device is used to cover and relay the electromagnetic wave signals. When the distance between the RF system and the relay device is relatively close, the above-mentioned relay device can ensure that the output power is constant when over-excited within a preset range. However, during product assembly and product use, the relay device may have an antenna connection mismatch or even an open circuit, causing the RF system output signal to be mostly reflected by the antenna port to damage some devices in the RF system.

In order to solve the above problem, an ALC (Automatic Level Control) automatic level controller is added to the RF system, and the ALC circuit converts the output RF signal into a DC component, and amplifies the DC component as a bias reference of the RF system input signal. However, the above ALC circuit is affected by the modulation system and output power in the RF system, and the ALC circuit needs to be modified accordingly, so that the detection accuracy and dynamic use range of the RF system are limited.

Summary of the invention

The invention provides a radio frequency control system and a control method.

According to a first aspect of the present invention, a radio frequency control system is provided, the system comprising a first detection circuit, a first pulse processing circuit and a controller;

The first detecting circuit is configured to convert the received radio frequency signal into a direct current signal and send the signal to the first pulse processing circuit;

The first pulse processing circuit is configured to perform analog-to-digital conversion of the DC signal to obtain a digital pulse signal and send the signal to the controller;

The controller is configured to collect the power of each received pulse signal to obtain an actual power value of the radio frequency signal, and generate a preset instruction to send to the radio frequency signal transmitting end according to the comparison result between the actual power value and the target output power value. To adjust the transmit power of subsequent RF signals.

According to a second aspect of the present invention, a radio frequency control system is provided, the system comprising a controller and a first power meter;

The first power meter is configured to acquire an actual power value of the received radio frequency signal and send the value to the controller;

The controller is configured to generate a preset command according to the comparison result between the actual power value and the target output power value, and send the preset instruction to the radio frequency signal transmitting end to adjust the transmit power of the subsequent radio frequency signal.

According to a third aspect of the present invention, a method for controlling a radio frequency control system is provided, the method comprising:

Obtaining the actual power value of the radio frequency signal;

And generating a preset command according to the comparison result between the actual power value and the target output power value, and transmitting the preset command to the radio frequency signal transmitting end to adjust the transmitting power of the subsequent radio frequency signal.

According to the technical solution provided by the embodiment of the present invention, the first detection circuit converts the received radio frequency signal into a DC signal and sends it to the first pulse processing circuit, and then uses the first pulse processing circuit to perform the DC signal. The digital conversion obtains the digital pulse signal and sends it to the controller; finally, the controller counts the received power of each pulse signal to obtain the RF signal. The actual power value of the number, and then based on the comparison result of the actual power value and the target output power value, generates a preset command and sends it to the RF signal transmitting end to adjust the transmitting power of the subsequent RF signal. It can be seen that the embodiment of the invention can control the output power of the RF signals of different standards and improve the adaptation range of the control system.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

1 to FIG. 5 are schematic structural diagrams of an RF control system according to an embodiment of the present invention;

6 to 7 are schematic structural diagrams of a radio frequency control system according to another embodiment of the present invention;

FIG. 8 is a schematic flowchart of a method for controlling a radio frequency control system according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The radio frequency control system and the control method provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and embodiments described below may be combined with each other without conflict.

In the embodiment of the present invention, the radio frequency system multiplexes the antenna ANT in time, so that the radio frequency system has a transmission link (TX link) and a reception link (RX link). The TX link refers to a radio frequency signal transmission link formed by the radio frequency system and the antenna when the antenna transmits the radio frequency signal; the RX link refers to the radio frequency signal receiving chain formed by the radio frequency system and the antenna when the antenna receives the radio frequency signal. road. When the output power of the radio frequency signal is controlled, the transmitter of the radio frequency signal, that is, the transmitter, can be adjusted, and the antenna can be compensated. In the embodiment of the present invention, the transmitter outputs constant power, but the output power of the radio frequency signal needs to be compensated by the influence of the communication environment as an example for description.

In the related art, the detection tube is used to convert the radio frequency signal into a direct current component, and then the direct current component is processed as a reference bias, which is suitable for detecting a sine wave. However, since the UAV adopts TDD (Time Division Duplexing) time division duplex mode to realize two-way communication, the detection tube needs to detect and output a time slot signal with a duty ratio, and at this time, the detected DC components are inconsistent, affecting detection accuracy and output. Power control accuracy. To this end, the above-mentioned RF control system needs to perform hardware adjustment according to different types of RF signals, resulting in extremely limited use range. Moreover, in the related art, the output power detection and the standing wave detection are implemented by the same circuit, which causes the two to influence each other, the dynamics of the detection are limited, and the consistency of the detection results is poor.

To solve the above problem, an embodiment of the present invention provides a radio frequency control system. As shown in FIG. 1, the radio frequency control system includes a first detection circuit 2, a first pulse processing circuit 3, and a controller 4. The first detecting circuit 2 is configured to convert the received radio frequency signal into a direct current signal and send the signal to the first pulse processing circuit 2. The first pulse processing circuit 2 is configured to perform analog-to-digital conversion on the DC signal to obtain a digital pulse signal and transmit the signal to the controller 4. The controller 4 collects the power of each pulse signal to obtain the actual power value of the radio frequency signal, and then generates a preset command according to the comparison result between the actual power value and the target output power value, and sends the preset command to the radio frequency signal transmitting end to adjust the subsequent radio frequency. The transmit power of the signal.

In an embodiment of the invention, as shown in FIG. 1, the radio frequency control system further includes a circulator 6 and a first signal coupling circuit 1 disposed at an input end of the circulator 6. In the transmitting phase of the radio frequency signal, the input end of the circulator 6 is connected to the TX link, and can receive the radio frequency signal transmitted by the radio frequency system. The first signal coupling circuit 1 is disposed at the input of the circulator 6 for transmitting a radio frequency signal coupled to the input of the circulator 6 to the first detector circuit 2. It should be noted that, in order to ensure that the RF signal is effectively input into the circulator 6, the first signal coupling circuit 1 only couples a certain proportion of the RF signal, for example, the above ratio may be 5%. Of course, the above-mentioned ratio can be adjusted according to actual needs, which is not limited in the embodiment of the present invention.

In an embodiment of the invention, as shown in FIG. 1, the radio frequency control system further includes an attenuation circuit 5. The attenuation circuit 5 is connected to the controller 4, receives a preset command from the controller 4, and compensates the output power of the radio frequency signal according to the preset command.

It can be seen that in the above embodiment of the present invention, the first signal coupling circuit 1, the first detecting circuit 2, the first pulse processing circuit 3, the controller 4 and the attenuator 5 can adjust the output power of the radio frequency signal. In the embodiment of the present invention, the analog signal is converted into a pulse signal to obtain a pulse signal, which can avoid the DC component corresponding to the same duty cycle RF signal in different systems in the related art, or the DC component corresponding to different duty ratios in the same system is consistent. The situation; then the power of each pulse signal is obtained to obtain the actual power value of the radio frequency signal for processing, which can improve the control precision and the adaptation range of the system.

The configuration and selection of the above components will be further described below.

In an embodiment of the invention, the first detection circuit 2 can be implemented by using a diode or a Root Mean Square (RMS) detection chip. A person skilled in the art can also detect the radio frequency signal according to the function of the first detecting circuit 2 and select a corresponding detecting circuit. The above solution also falls within the protection scope of the present invention.

In an embodiment of the invention, as shown in FIG. 2, the first pulse processing circuit 3 includes at least a first analog to digital converter 31 and a first threshold unit 32. The first analog to digital converter 31 is connected to the first detection circuit 2, and the first threshold unit 32 is connected to the controller 4. The first analog-to-digital converter 31 samples the DC signal from the first detector circuit 2 according to a preset acquisition frequency, so that the DC signal can be analog-to-digital converted to obtain a plurality of pulse signals, and the plurality of pulse signals are sent to the first A threshold unit 32. The first threshold unit 32 compares the amplitude of each pulse signal with a preset amplitude, and selects a pulse signal whose amplitude is greater than or equal to a preset amplitude from the plurality of pulse signals. Send to controller 4.

It should be noted that each of the plurality of pulse signals has different amplitudes, and the pulse signals of different amplitudes correspond to different energies, and the pulse signals of the same amplitude have the same energy. In this way, in the embodiment of the present invention, various DC components are collected by reasonably setting a preset acquisition frequency to ensure the integrity of each DC signal feature. Then, by filtering out the pulse signals satisfying the amplitude requirements from the plurality of pulse signals, it is ensured that the number of pulse signals corresponding to the same duty cycle RF signals in different systems is the same, or the pulses corresponding to the different duty cycle RF signals in the same system. The number of signals is different. It can be seen that the embodiment of the present invention is applicable to a scenario in which the output power of the radio frequency signal under different standards is controlled, and the applicable range is expanded.

It should be noted that the first analog-to-digital converter 31 is implemented by using an ADC conversion chip. The first threshold unit 32 can be implemented in hardware, such as a Smith trigger; the first threshold unit 32 can also be a threshold integrated into the ADC conversion chip. Additionally, the first threshold unit 32 can be integrated into the controller 4 or integrated into the controller 4 simultaneously with the ADC conversion chip.

In an embodiment of the invention, the attenuation circuit 5 can be implemented using a voltage controlled attenuator. The voltage controlled attenuator searches for a corresponding control voltage according to a preset instruction of the controller 4, and then superimposes on the current control voltage, outputs the superposed control voltage to the radio frequency signal transmitting end, or transmits the searched control voltage to the circulator 6. The output power of the radio frequency signal is compensated by the circulator 6.

In another embodiment of the present invention, the attenuation circuit 5 may include a first attenuator and a second attenuator for the purpose of satisfying the application of accurately adjusting the transmit power of the radio frequency signal. The first attenuator and the second attenuator are respectively connected to the controller 5, and the first attenuator and the second attenuator are connected. The first attenuator is configured to compensate the output power of the radio frequency signal according to the first step length in response to the preset instruction of the controller 4. The second attenuator is configured to compensate the output power of the radio frequency signal according to the second step size in response to the preset instruction of the controller 4.

As shown in FIG. 3, the first attenuator can be implemented with a radio frequency attenuator 51, and the second attenuator can be implemented with a baseband attenuator 52. For example, when the RF attenuator 51 compensates, the first step length can be set to 0.5 dB, and when the baseband attenuator 52 compensates, the second step size can be set to 0.1 dB. Thus, when the transmission power of the radio frequency signal needs to be compensated by 9.7 dB, the radio frequency attenuator 51 first compensates. The 19 first steps are 19*0.5=9.5dB. Since 0.2dB is smaller than the first step, the remaining part is compensated by the baseband attenuator 52 for 2 second steps, ie 2*0.1=0.2dB. That is, the first step length (set to S1), the second step size (set to S2), and the attenuation factor Δ satisfy:

Δ=(N-1)*S ₁ +(M-1)*S ₂ .

In the formula, S1 and S2 represent the first step length and the second step length, respectively, and N and M represent integers greater than 1.

The first step S1 and the second step S2 can be adjusted according to actual requirements, which is not limited in the embodiment of the present invention.

In applications where rapid adjustment of the RF signal transmit power is required, the attenuation circuit 5 may only include the first attenuator. The first attenuator is implemented using a radio frequency attenuator 51. Taking the transmission power of the radio frequency signal to compensate 9.7dB as an example, when the transmission power needs to be increased, the first attenuator 51 compensates 19 first steps, that is, 19*0.5=9.5dB, and the remaining 0.2dB is no longer compensated, preventing The output power increases too fast, affecting the normal use of the transmitting system. When the transmission power needs to be reduced, the first attenuator 51 compensates 20 first-step lengths, that is, 20*0.5=10 dB, so that the transmitting end can rapidly reduce the output power to reduce the influence of excessive output power on other devices. Of course, if the transmission power of the radio frequency signal needs to be compensated by 9.5 dB, the first attenuator 51 can directly compensate 19 first-step lengths, and avoid the influence of the output power increasing too fast on other devices. In the embodiment of the present invention, only the case where only one RF attenuator 51 is provided is exemplified. In this case, in order to further improve the control precision, the first step length may be adjusted according to the specific use scenario, and the uncompensated portion may be reduced. ratio.

In applications where the amplitude of the RF signal output power is not large, the attenuation circuit 5 may only include the second attenuator. For the adjustment process of the second attenuator, reference may be made to the description when the first attenuator is included, and details are not described herein again.

In an embodiment of the invention, as shown in FIG. 1, FIG. 2 and FIG. 3, the radio frequency control system further includes a second detection circuit 8, a second pulse processing circuit 9, and a second signal coupling circuit 10. The second signal coupling circuit 10 is coupled to the output of the circulator 8, the second detector circuit 8 is coupled to the second signal coupling circuit 10, and the second pulse processing circuit 9 is coupled in series with the second detector circuit 8 and the controller 4. between. The second detecting circuit 8 converts the received radio frequency signal into a direct current signal and transmits it to the second pulse processing circuit 9. Then, the second pulse processing circuit 9 performs analog-to-digital conversion on the DC signal to obtain a digital pulse signal and transmits it to the controller 4. The controller 4 counts the received power of each pulse signal to obtain a reflected power value of the radio frequency signal, and calculates a standing wave ratio according to the actual power value and the reflected power value to generate a prompt signal indicating whether the antenna and its subsequent circuits are faulty.

The reflected power value refers to a part of the power value corresponding to the radio frequency signal (ie, the reflected signal) that the antenna reflects back to the RX link. The reflected power value can be detected from the circulator output.

In order to prevent the reflected power value of the open-circuit reflected signal from being excessively damaged to damage the standing wave detecting component, the second signal coupling circuit 10 only couples a certain proportion of the reflected signal, for example, the above ratio may be 5%. Of course, the above-mentioned ratio can be adjusted according to actual needs, which is not limited in the embodiment of the present invention.

It can be seen that the second signal coupling circuit 10, the second detecting circuit 8, the second pulse processing circuit 9, and the controller 4 in the above embodiment of the present invention can detect whether there is a fault in the antenna and its subsequent circuits. In order to ensure the adjustment effect of the output power, the configuration and selection of the above components will be further described below.

In an embodiment of the invention, the second detection circuit 8 can be implemented by using a diode or a Root Mean Square (RMS) detection chip. A person skilled in the art can also detect the radio frequency signal according to the function of the second detecting circuit 8 and select a corresponding detecting circuit, and the above solution also falls within the protection scope of the present invention.

In order to facilitate the system design, the second detection circuit 8 and the first detection circuit 2 are implemented by the same circuit.

In an embodiment of the invention, as shown in FIG. 4, the second pulse processing circuit 9 includes at least a second analog to digital converter 91 and a second threshold unit 92. The second analog to digital converter 91 is connected to the second detection circuit 8, and the second threshold unit 92 is connected to the controller 4. The second analog-to-digital converter 91 samples the DC signal from the second detector circuit 8 according to a preset acquisition frequency, so that the DC signal can be analog-to-digital converted to obtain a plurality of pulse signals, and a plurality of pulse signals are sent to the first Two threshold unit 92. The second threshold unit 92 compares the amplitude of each pulse signal with a preset amplitude, and selects a pulse signal whose amplitude is greater than or equal to a preset amplitude from the plurality of pulse signals. Send to controller 4.

Each of the plurality of pulse signals has different amplitudes, and the pulse signals of different amplitudes correspond to different energies, and the pulse signals of the same amplitude have the same energy.

It can be understood that, in the embodiment of the present invention, by appropriately setting the preset acquisition frequency, characteristics of various DC components can be sampled to ensure the integrity of the DC signal feature. Then, by filtering out the pulse signals satisfying the amplitude requirement from the plurality of pulse signals, it is ensured that the radio frequency signals of the same duty ratio have the same number of pulse signals after passing through the second pulse processing circuit 9. In the embodiment of the present invention, the accuracy of the corresponding power calculation of the radio frequency signal can be improved by setting the second analog-to-digital converter 91 and the second threshold unit 92, and is suitable for calculating the corresponding power of the radio frequency signal in different standards.

It should be noted that the second analog-to-digital converter 91 is implemented by using an ADC conversion chip. The second threshold unit 92 can be implemented in hardware, such as a Smith trigger; or can be set to a threshold and integrated into the ADC conversion chip. Additionally, the second threshold unit 92 can be integrated into the controller 4 or integrated into the controller 4 simultaneously with the ADC conversion chip.

To facilitate system design, the second pulse processing circuit 9 and the first pulse processing circuit 3 are implemented using the same circuit.

The controller 4 can determine the actual power of the radio frequency signal at the input of the circulator and the reflected power of the radio frequency signal at the output of the circulator according to the calculated standing wave ratio, and the power radiated by the antenna without loss of the circulator (the above actual power) The difference power from the reflected power). Determine whether the antenna is open or the antenna and subsequent circuits are faulty according to the power radiated from the antenna.

It should be noted that the above actual power value is stored in the controller during the output power detection process. The actual power value may be equal to or different from the target output power value. In order to obtain a better detection effect, when the actual power value is close to the target output power value (the difference is less than the preset error range), the controller sends a preset instruction to the second selection switch, that is, the output power of the transmitting end is satisfied. Standing wave detection is performed when required.

If the antenna is open, the antenna will reflect all the RF signals back to the RX link, possibly damaging the components in the RX link. To this end, in an embodiment of the present invention, as shown in FIG. 4, The radio frequency control system further includes a first selection switch 11 and a protection circuit 12. The input end of the first selector switch 11 is connected to the output end of the circulator, the first output end of which is connected to the RX link, and the second output end of which is connected to the protection circuit 12. Correspondingly, the radio frequency signal received by the second detector circuit 8 is derived from the second signal coupling circuit 10 coupled between the second output of the first selector switch 11 and the protection circuit 12. The first selection switch 11 can select the RX link or the protection circuit 12 in response to a preset instruction of the controller 4. That is, the first selection switch 11 can switch the radio frequency control system to the standing wave detection process and protect the components in the RX link from being damaged. The protection circuit 12 can consume the energy of the radio frequency signal during the standing wave detection process, and protect the subsequent components such as the second detection circuit and the second pulse processing circuit.

In a practical application, the first selection switch 11 can be a single-pole double-gate switch, and can also be implemented by using a component to construct a switch circuit having a selection function, which is not limited in the embodiment of the present invention.

In an embodiment of the invention, the first detector circuit 2 and the second detector circuit 8 are multiplexed, and/or the first pulse processing circuit 3 and the second pulse processing circuit 9 are multiplexed. When the first detecting circuit 2 and the second detecting circuit 8 are multiplexed, and the first pulse processing circuit 3 and the second pulse processing circuit 9 are multiplexed, as shown in FIG. 5, the radio frequency control system further includes a second selection switch 13. The first input end of the second selection switch 13 is connected to the second signal coupling circuit 10, the second end of which is connected to the first signal coupling circuit 1, and the output end thereof is connected to the first detection circuit 2. The second selector switch 13 is responsive to a predetermined command from the controller 4 to select to receive a radio frequency signal from the input of the circulator 6 or its output.

It can be understood that when the first pulse processing circuit 3 and the second pulse processing circuit 9 are multiplexed, the first input end of the second selection switch 13 is connected to the output end of the first detection circuit 2, and the second input end thereof is connected. An output terminal of the second detector circuit 8 is connected, and an output terminal thereof is connected to the input terminal of the first pulse circuit 3. A person skilled in the art can reasonably deform in the case of realizing the above functions, and the invention is not limited thereto.

In a practical application, the second selection switch 13 can be a single-pole double-gate switch, and can also be implemented by using a component to construct a switch circuit having a selection function, which is not limited in the embodiment of the present invention. In order to facilitate the system design, the first selection switch 11 and the second selection switch 13 in the embodiment of the present invention may be implemented by the same circuit.

An embodiment of the present invention provides a radio frequency control system. As shown in FIG. 6, the radio frequency control system includes a first power meter 14 and a controller 4. The first signal coupling device 1 is coupled to the input end of the circulator 6 or the TX link, and the first power meter 14 is connected to the first signal coupling device 1 for acquiring the actual power value of the received RF signal and transmitting it to the 4 Controller. The controller 4 determines the ratio of the standing wave ratio of the actual power value and the reflected power value, and then determines the ratio of the RF signal reflected by the antenna to the received RF signal, and determines whether the antenna transmits all the RF signals, thereby determining whether the antenna and its subsequent circuits are There is a fault.

In an embodiment of the invention, as shown in FIG. 6, the radio frequency control system further includes an attenuation circuit 5. The attenuation circuit 5 is connected to the controller 4, receives a preset command from the controller 4, and compensates the output power of the radio frequency signal according to the preset command.

It can be seen that in the above embodiment of the present invention, the first power meter 14, the controller 4 and the attenuator 5 can adjust the output power of the radio frequency signal. Since the first power meter 14 can accurately obtain the reflected power value of the radio frequency signal; then the controller 4 determines the standing wave ratio by calculating the actual power value and the reflected power value, thereby improving the judgment accuracy and the adaptation range of the system. The configuration and selection of the above components will be further described below.

In an embodiment of the invention, the attenuation circuit 5 can be implemented using a voltage controlled attenuator. The voltage controlled attenuator searches for a corresponding control voltage according to a preset instruction of the controller 4, and then superimposes it on the control voltage in the current situation, outputs the superimposed control voltage to the radio frequency signal transmitting end, or transmits the searched control voltage to the control voltage. The circulator 6 compensates for the output power of the radio frequency signal by the circulator 6.

In another embodiment of the present invention, the attenuation circuit 5 may include a first attenuator and a second attenuator for the purpose of satisfying the application of accurately adjusting the transmit power of the radio frequency signal. The first attenuator and the second attenuator are respectively connected to the controller 5, and the first attenuator and the second attenuator are connected. The first attenuator is configured to compensate the output power of the radio frequency signal according to the first step length in response to the preset instruction of the controller 4. The second attenuator is configured to compensate the output power of the radio frequency signal according to the second step size in response to the preset instruction of the controller 4.

As shown in FIG. 6, the first attenuator can be implemented by using the RF attenuator 51, and the second attenuator This can be achieved with a baseband attenuator 52. For example, when the RF attenuator 51 compensates, the first step length can be set to 0.5 dB, and when the baseband attenuator 52 compensates, the second step size can be set to 0.1 dB. When the transmission power of the radio frequency signal needs to be compensated by 9.7 dB, the radio frequency attenuator 51 first compensates 19 first-step lengths, that is, 19*0.5=9.5 dB. Since 0.2 dB is smaller than the first step length, the remaining portion is compensated by the baseband attenuator 52. The second step is 2*0.1=0.2dB. That is, the first step length (set to S1), the second step size (set to S2), and the attenuation factor Δ satisfy:

Δ=(N-1)*S ₁ +(M-1)*S ₂ .

In the formula, S1 and S2 represent the first step length and the second step length, respectively, and N and M represent integers greater than 1.

The first step S1 and the second step S2 can be adjusted according to actual requirements, which is not limited in the embodiment of the present invention.

In applications where rapid adjustment of the RF signal transmit power is required, the attenuation circuit 5 may only include the first attenuator. The first attenuator is implemented using a radio frequency attenuator 51. Taking the transmission power of the radio frequency signal to compensate 9.7dB as an example, when the transmission power needs to be increased, the first attenuator 51 compensates 19 first steps, that is, 19*0.5=9.5dB, and the remaining 0.2dB is no longer compensated, preventing The output power increases too fast, affecting the normal use of the transmitting system. When the transmission power needs to be reduced, the first attenuator 51 compensates 20 first-step lengths, that is, 20*0.5=10 dB, so that the output power of the RF signal transmitting end can be quickly reduced to reduce the influence of excessive power on other devices. Of course, if the transmission power of the radio frequency signal needs to be compensated by 9.5 dB, the first attenuator 51 can directly compensate 19 first-step lengths, and prevent the power of the transmitting end from increasing too fast to affect other devices. In the embodiment of the present invention, the case where only one RF attenuator 51 is provided is exemplarily illustrated. In this case, in order to further improve the control precision, the first step length may be adjusted according to a specific use scenario, and the proportion of the uncompensated portion may be reduced. .

In applications where the amplitude of the RF signal transmission power is more accurate, the attenuation circuit 5 may only include the second attenuator. For the adjustment process of the second attenuator, reference may be made to the description when the first attenuator is included, and details are not described herein again.

In an embodiment of the invention, as shown in FIG. 6, the radio frequency control system further includes a second power meter. 15 and a second signal coupling circuit 10. The second signal coupling circuit 10 is coupled to the output of the circulator 8, which is coupled to the second signal coupling circuit 10. The second power meter 15 is configured to acquire a reflected power value of the received radio frequency signal and send it to the controller 4. The controller 4 is configured to calculate a standing wave ratio according to the actual power value and the reflected power value to generate a prompt signal indicating whether the antenna and its subsequent circuits are faulty.

The controller 4 can determine the ratio of the RF signal reflected by the antenna to the received RF signal according to the calculated standing wave ratio, thereby determining whether the antenna transmits all of the RF signal. If the antenna is open, the antenna will reflect all the RF signals back to the RX link, possibly damaging the components in the RX link.

To protect the components in the RX link, in an embodiment of the present invention, as shown in FIG. 6, the radio frequency control system further includes: a first selection switch 11 and a protection circuit 12. The input end of the first selector switch 11 is connected to the output of the circulator 6, the first output of which is connected to the RX link, and the second output of which is connected to the protection circuit 12. Correspondingly, the radio frequency signal received by the second power meter 15 is from the second signal coupling circuit 10 coupled between the second output of the first selector switch 11 and the protection circuit 12. Thus, the first selection switch 11 can select the RX link or the protection circuit 12 in response to a preset instruction of the controller 4. That is, the first selection switch 11 can protect the components in the RX link from being damaged. The protection circuit 12 can consume the energy of the radio frequency signal during the standing wave detection process, and protect the subsequent components of the second power meter 15 and the like. The protection circuit 12 can be implemented by a resistor or by other circuits including a resistor.

In a practical application, the first selection switch 11 can be a single-pole double-gate switch, and can also be implemented by using a component to construct a switch circuit having a selection function, which is not limited in the embodiment of the present invention.

In an embodiment of the invention, the first power meter 14 and the second power meter 15 are multiplexed. To facilitate detection of output power and standing waves, as shown in FIG. 7, the radio frequency control system further includes a second selection switch 13. The first input end of the second selection switch 13 is connected to the second signal coupling circuit 10, the second end of which is connected to the first signal coupling circuit 1, and the output end thereof is connected to the first power meter 14. The second selector switch 13 is responsive to a predetermined command from the controller 4 to select to receive a radio frequency signal from the input of the circulator 6 or its output.

In a practical application, the second selection switch 13 can be a single-pole double-gate switch, and can also be implemented by using a component to construct a switch circuit having a selection function, which is not limited in the embodiment of the present invention. In order to facilitate the system design, the first selection switch 11 and the second selection switch 13 in the embodiment of the present invention may be implemented by the same circuit.

The embodiment of the invention provides a method for controlling the radio frequency control system. As shown in FIG. 8, the control method includes:

S1. Obtain an actual power value of the radio frequency signal.

S2: Generate a preset command according to the comparison result between the actual power value and the target output power value, and send the preset command to the radio frequency signal transmitting end to adjust the transmit power of the subsequent radio frequency signal.

The controller 4 is provided with the control method as an example for description.

In the foregoing step S1, the controller obtains the actual power value of the radio frequency signal and directly receives the actual power value of the radio frequency signal. For example, the actual power value may be from the first power meter 14, or may directly calculate the actual power value of the radio frequency signal, for example, control. The device 4 receives the pulse signals from the first pulse processing circuit 3 and/or the second pulse processing circuit 9, and then counts the power of each pulse signal to obtain the actual power value of the radio frequency signal.

In the above step S2, the controller 4 compares the actual power value with the target output power value, and then generates a preset command according to the comparison result. When the attenuation circuit 5 includes the voltage control attenuator, the method includes:

When the actual power value is greater than or equal to the target output power value, generating a first preset instruction indicating that the output power is reduced is sent to the voltage control attenuator;

When the actual power value is less than the target output power value, generating a second preset command indicating that the control voltage is increased is sent to the voltage controlled attenuator.

In the above step S2, the controller 4 compares the actual power value with the target output power value, and then generates a preset command according to the comparison result. When the attenuation circuit 5 includes only the radio frequency attenuator 51, the method includes:

When the actual power value is greater than or equal to the target output power value, generating a first pre-decrement command indicating that the output power is reduced to be sent to the radio frequency attenuator;

When the actual power value is less than the target output power value, generating a first pre-increment command indicating an increase in output power is sent to the radio frequency attenuator.

In the above step S2, the controller 4 compares the actual power value with the target output power value, and then generates a preset command according to the comparison result. When the attenuation circuit 5 includes only the radio frequency attenuator 51, the method includes:

Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

When Δ=(N-1)*S ₁ is satisfied, N-1 is taken as the first pre-subtraction instruction;

S1 represents the first step length; N is an integer greater than 1.

In the above step S2, the controller 4 compares the actual power value with the target output power value, and then generates a preset command according to the comparison result. When the attenuation circuit 5 includes the RF attenuator 51 and the baseband attenuator 52, the method includes:

Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

When Δ=(N-1)*S ₁ is satisfied, N-1 is taken as the first pre-increment instruction;

S1 represents the first step length; N is an integer greater than 1.

In the above step S2, the controller 4 compares the actual power value with the target output power value, and then generates a preset command according to the comparison result. When the attenuation circuit 5 includes the RF attenuator 51 and the baseband attenuator 52, the method includes:

When the actual power value is greater than or equal to the target output power value, generating a first pre-decrement command indicating that the output power is reduced, and transmitting the signal to the baseband attenuator;

When the actual power value is less than the target output power value, generating a first pre-increment command indicating an increase in output power is sent to the radio frequency attenuator and the second pre-increment command is sent to the baseband attenuator.

In the above step S2, the controller 4 compares the actual power value with the target output power value, and then generates a preset command according to the comparison result. When the attenuation circuit 5 includes the RF attenuator 51 and the baseband attenuator 52, the method includes:

Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

When (N-1)*S ₁ ≤Δ<N*S ₁ is satisfied, N-1 is taken as the first pre-subtraction instruction;

When satisfied _{(M-1) * S 2} ≤Δ- (N-1) * S 1 ≤M * S _2, M is the second pre-cut instruction;

S1 and S2 represent the first step length and the second step length, respectively; N and M are integers greater than 1, respectively.

In the above step S2, the controller 4 compares the actual power value with the target output power value, and then generates a preset command according to the comparison result. When the attenuation circuit 5 includes the RF attenuator 51 and the baseband attenuator 52, the method includes:

Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

When (N-1)*S ₁ ≤Δ<N*S ₁ is satisfied, N-1 is taken as the first pre-increment instruction;

When satisfied _{(M-1) * S 2} ≤Δ- (N-1) * S 1 ≤M * S _2, M-1 as the pre-energizer second instruction;

S1 and S2 represent the first step length and the second step length, respectively; N and M are integers greater than 1, respectively.

Finally, it should be noted that the specific manners of the various components of the radio frequency control system in the above embodiments have been described in detail in the embodiments related to the system, and the structure of the radio frequency control system provided by the embodiment of the present invention is based on actual use. When the scenario changes, the control method provided by the embodiment of the present invention may be adjusted accordingly. No detailed explanation will be given here.

For the method embodiment, since it basically corresponds to the system embodiment, the relevant parts of the system embodiment can be referred to relevant. The system and method embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie It can be located in one place or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the present disclosure. Those of ordinary skill in the art can understand and implement without any creative effort.

It should be noted that, in this context, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, without necessarily requiring or It implies that there is any such actual relationship or order between these entities or operations. The terms "including", "comprising" or "comprising" or "comprising" are intended to include a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also other items not specifically listed Elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The radio frequency control system and the control method provided by the embodiments of the present invention are described in detail. The principles and implementation manners of the present invention are described in the following. The description of the above embodiments is only used to help understand the present invention. The method and its core idea; those skilled in the art, according to the idea of the present invention, there are some changes in the specific embodiments and application scope. In summary, the content of the present specification should not be construed as being limit.

Claims (46)

1. An RF control system, characterized in that the system comprises a first detection circuit, a first pulse processing circuit and a controller;

   The first detecting circuit is configured to convert the received radio frequency signal into a direct current signal and send the signal to the first pulse processing circuit;

   The first pulse processing circuit is configured to perform analog-to-digital conversion of the DC signal to obtain a digital pulse signal and send the signal to the controller;

   The controller is configured to collect the power of each received pulse signal to obtain an actual power value of the radio frequency signal, and generate a preset instruction to send to the radio frequency signal transmitting end according to the comparison result between the actual power value and the target output power value. To adjust the transmit power of subsequent RF signals.
2. The radio frequency control system according to claim 1 further comprising a circulator and a first signal coupling circuit disposed at an input of said circulator, said radio frequency signal being passed through said first signal coupling circuit Coupling at the input of the circulator.
3. The radio frequency control system according to claim 1, wherein said first pulse processing circuit comprises at least a first analog to digital converter and a first threshold unit;

   The first analog-to-digital converter is connected to the first detection circuit, and is configured to sample the DC signal according to a preset acquisition frequency to perform analog-to-digital conversion to obtain a pulse signal, and send the pulse signal to the first threshold unit.

   The first threshold unit is serially connected between the first analog-to-digital converter and the controller, and is configured to send, from the pulse signal, a pulse signal having a magnitude greater than or equal to a preset amplitude to the controller. .
4. The radio frequency control system of claim 3 wherein said first threshold unit is integrated in said controller.
5. The radio frequency control system of claim 3 wherein said first threshold unit and said first analog to digital converter are simultaneously integrated in said controller.
6. The radio frequency control system according to claim 3, wherein said first threshold is The meta includes the Smith trigger.
7. The radio frequency control system according to claim 3, wherein each of the pulse signals has different amplitudes, and the pulse signals of different amplitudes correspond to different energies.
8. The radio frequency control system according to claim 1, wherein said first detection circuit is a square root RMS detection chip.
9. The radio frequency control system of claim 1 wherein said first detector circuit is a diode.
10. The radio frequency control system according to claim 2, wherein the system further comprises an attenuation circuit coupled to the circulator for compensating for an output power of the radio frequency signal.
11. The radio frequency control system according to claim 10, wherein said attenuation circuit comprises a first attenuator, said first attenuator being coupled to said controller;

    The first attenuator is configured to compensate the circulator output power according to a first step length in response to a preset instruction of the controller.
12. The radio frequency control system according to claim 11, wherein said attenuation circuit further comprises a second attenuator; said second attenuator being respectively coupled to said first attenuator and said controller;

    The second attenuator is configured to compensate an output power of the radio frequency signal according to a second step size in response to a preset instruction of the controller.
13. The radio frequency control system according to claim 12, wherein the controller first controls the first attenuator to compensate output power, and then controls the second attenuator to compensate output power.
14. The radio frequency control system according to claim 12, wherein said first attenuator is a radio frequency attenuator and said second attenuator is a baseband attenuator.
15. The radio frequency control system of claim 10 wherein said attenuation circuit comprises a voltage controlled attenuator.
16. The radio frequency control system according to claim 1, wherein said system further comprises a second detection circuit and a second pulse processing circuit;

    The second detecting circuit is configured to convert the received radio frequency signal into a direct current signal and send the signal to the second pulse processing circuit;

    The second pulse processing circuit is configured to perform analog-to-digital conversion on the DC signal to obtain a digital pulse signal and send the signal to the controller;

    The controller is configured to collect the reflected power value of the received radio signal, and calculate a standing wave ratio according to the actual power value and the reflected power value to generate whether the antenna and its subsequent circuit are generated. There is a warning signal for the fault.
17. The radio frequency control system according to claim 16, wherein said system further comprises a second signal coupling circuit disposed at an output of said circulator, said radio frequency signal being passed through said second signal coupling circuit at said ring Coupling at the output of the device.
18. The radio frequency control system according to claim 16, wherein said second pulse processing circuit comprises at least a second analog to digital converter and a second threshold unit;

    The second analog-to-digital converter is configured to sample the DC signal according to a preset acquisition frequency to perform analog-to-digital conversion to obtain a pulse signal, and send the pulse signal to the second threshold unit;

    The second threshold unit is configured to send, from the plurality of the pulse signals, a pulse signal having a magnitude greater than or equal to a preset amplitude to the controller.
19. The radio frequency control system according to claim 16, wherein the system further comprises a first selection switch and a protection circuit, the input end of the first selection switch being connected to the output end of the circulator, and the first output end thereof Connecting an RX link, the second output of which is connected to the protection circuit;

    The first selection switch is configured to select the RX link or the protection circuit in response to a preset instruction of the controller;

    Correspondingly, the radio frequency signal received by the second detector circuit is derived from a second signal coupling circuit coupled between the second output and the protection circuit.
20. The radio frequency control system according to claim 16, wherein said first selection switch is a single pole double gate switch.
21. The radio frequency control system according to claim 16, wherein said second detection circuit is a square root RMS detection chip.
22. The radio frequency control system of claim 16 wherein said second detector circuit is a diode.
23. The radio frequency control system according to claim 1, wherein said first detection circuit and said second detection circuit are multiplexed.
24. The radio frequency control system according to claim 1, wherein said first pulse processing circuit and said second pulse processing circuit are multiplexed.
25. The radio frequency control system according to claim 23 or 24, wherein the system further comprises a second selection switch, the first input end of the second selection switch is connected to the second signal coupling circuit, and the second end is connected a first signal coupling circuit having an output connected to the first detection circuit;

    The second selection switch is configured to select to receive a radio frequency signal from the circulator input or its output in response to a preset instruction of the controller.
26. An RF control system, the system comprising a controller and a first power meter;

    The first power meter is configured to acquire an actual power value of the received radio frequency signal and send the value to the controller;

    The controller is configured to generate a preset command according to the comparison result between the actual power value and the target output power value, and send the preset instruction to the radio frequency signal transmitting end to adjust the transmit power of the subsequent radio frequency signal.
27. The radio frequency control system according to claim 26, wherein said system further comprises an attenuation circuit coupled to the circulator for compensating for an output power of the radio frequency signal.
28. The radio frequency control system according to claim 27, wherein said attenuation circuit comprises a first attenuator; said first attenuator being coupled to said controller;

    The first attenuator is configured to compensate an output power of the radio frequency signal according to a first instruction length in response to a preset instruction of the controller.
29. The radio frequency control system according to claim 28, wherein said attenuation circuit further comprises a second attenuator; said first attenuator being respectively coupled to said second attenuator and said controller;

    The second attenuator is configured to compensate for the second step in response to a preset instruction of the controller The output power of the frequency signal.
30. The radio frequency control system according to claim 29, wherein the controller first controls the first attenuator to compensate output power, and then controls the second attenuator to compensate output power.
31. The radio frequency control system according to claim 29, wherein said first attenuator is a radio frequency attenuator and said second attenuator is a baseband attenuator.
32. The radio frequency control system of claim 27 wherein said attenuation circuit comprises a voltage controlled attenuator.
33. The radio frequency control system according to claim 27, wherein said system further comprises a second power meter coupled to said controller;

    The second power meter is configured to acquire a reflected power value of the received radio frequency signal and send the value to the controller;

    The controller is configured to calculate a standing wave ratio according to the actual power value and the reflected power value to generate a prompt signal indicating whether the antenna and its subsequent circuits are faulty.
34. The radio frequency control system according to claim 33, wherein the system further comprises a first selection switch and a protection circuit, the input end of the first selection switch being connected to the output end of the circulator, and the first output end thereof Connecting an RX link, the second output of which is connected to the protection circuit;

    The first selection switch is configured to select the RX link or the protection circuit in response to a preset instruction of the controller;

    Correspondingly, the radio frequency signal received by the second power meter is from a second signal coupling circuit coupled between the second output and the protection circuit.
35. The radio frequency control system according to claim 34, wherein said first selection switch is a single pole double gate switch.
36. The radio frequency control system of claim 26 wherein said first power meter and said second power meter are multiplexed.
37. The radio frequency control system according to claim 36, wherein the system further comprises a second selection switch, the first input end of the second selection switch is connected to the second signal coupling circuit, and the second end is connected to the first a signal coupling circuit having an output connected to the first power meter;

    The second selection switch is configured to select to receive a radio frequency signal from the circulator input or its output in response to a preset instruction of the controller.
38. A method for controlling an RF control system, the method comprising:

    Obtaining the actual power value of the radio frequency signal;

    And generating a preset command according to the comparison result between the actual power value and the target output power value, and transmitting the preset command to the radio frequency signal transmitting end to adjust the transmitting power of the subsequent radio frequency signal.
39. The control method according to claim 38, wherein the step of obtaining an actual power value comprises:

    The power of each received pulse signal is counted to obtain the actual power value of the radio frequency signal.
40. The control method according to claim 38, wherein a preset command is generated and sent to the radio frequency signal transmitting end according to the comparison result between the actual power value and the target output power value to adjust the transmit power of the subsequent radio frequency signal. The steps include:

    When the actual power value is greater than or equal to the target output power value, generating a first preset instruction indicating that the output power is reduced is sent to the voltage control attenuator;

    When the actual power value is less than the target output power value, generating a second preset command indicating that the control voltage is increased is sent to the voltage controlled attenuator.
41. The control method according to claim 38, wherein a preset command is generated and sent to the radio frequency signal transmitting end according to the comparison result between the actual power value and the target output power value to adjust the transmit power of the subsequent radio frequency signal. The steps include:

    When the actual power value is greater than or equal to the target output power value, generating a first pre-decrement command indicating that the output power is reduced to be sent to the radio frequency attenuator;

    When the actual power value is less than the target output power value, generating a first pre-increment command indicating an increase in output power is sent to the radio frequency attenuator.
42. The control method according to claim 41, wherein when the actual power value is greater than or equal to the target output power value, generating a first pre-decrement command indicating reduction of output power is sent to the radio frequency attenuator and the second pre- The steps of sending the subtraction command to the baseband attenuator include:

    Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

    When Δ=(N-1)*S ₁ is satisfied, N-1 is taken as the first pre-subtraction instruction;

    S1 represents the first step length; N is an integer greater than 1.
43. The control method according to claim 41, wherein when the actual power value is less than the target output power value, generating a first pre-increment command indicating an increase in output power is sent to the radio frequency attenuator and the second pre-increment command transmission The steps for the baseband attenuator include:

    Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

    When Δ=(N-1)*S ₁ is satisfied, N-1 is taken as the first pre-increment instruction;

    S1 represents the first step length; N is an integer greater than 1.
44. The control method according to claim 38, wherein a preset command is generated and sent to the radio frequency signal transmitting end according to the comparison result between the actual power value and the target output power value to adjust the transmit power of the subsequent radio frequency signal. The steps include:

    When the actual power value is greater than or equal to the target output power value, generating a first pre-decrement command indicating that the output power is reduced, and transmitting the signal to the baseband attenuator;

    When the actual power value is less than the target output power value, generating a first pre-increment command indicating an increase in output power is sent to the radio frequency attenuator and the second pre-increment command is sent to the baseband attenuator.
45. The control method according to claim 44, wherein when the actual power value is greater than or equal to the target output power value, generating a first pre-decrement command indicating that the output power is reduced is sent to the radio frequency attenuator and the second pre- The steps of sending the subtraction command to the baseband attenuator include:

    Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

    When (N-1)*S ₁ ≤Δ<N*S ₁ is satisfied, N-1 is taken as the first pre-subtraction instruction;

    When satisfied _{(M-1) * S 2} ≤Δ- (N-1) * S 1 ≤M * S _2, M is the second pre-cut instruction;

    S1 and S2 represent the first step length and the second step length, respectively; N and M are integers greater than 1, respectively.
46. The control method according to claim 44, wherein when the actual power value is less than the target output power value, generating a first pre-increment command indicating an increase in output power is sent to the radio frequency attenuator and the second pre-increment command transmission The steps for the baseband attenuator include:

    Calculating the attenuation relationship between the actual power value and the target output power value determines the attenuation factor Δ;

    When (N-1)*S ₁ ≤Δ<N*S ₁ is satisfied, N-1 is taken as the first pre-increment instruction;

    When satisfied _{(M-1) * S 2} ≤Δ- (N-1) * S 1 ≤M * S _2, M-1 as the pre-energizer second instruction;

    S1 and S2 represent the first step length and the second step length, respectively; N and M are integers greater than 1, respectively.

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