Radio frequency emission channel standing wave detection system and control method thereof

Abstract

The invention provides a radio frequency emission channel standing wave detection system and a control method thereof.The standing wave detection system comprises a detection module and a control module, and the detection module detects power signals generated when a forward coupling end and a reverse coupling end of a bidirectional coupler in a radio frequency emission channel transmit excitation signals; the control module is respectively connected with the radio frequency emission channel and the detection module, receives the emission enable signal, performs initialization configuration on the detection module according to the emission enable signal, and controls the radio frequency emission channel to transmit an excitation signal based on the emission enable signal; and calculating the standing-wave ratio of the excitation signal transmitted by the radio frequency transmitting channel based on the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end. According to the radio frequency emission channel standing wave detection system provided by the invention, the working state of the whole machine power amplifier is accurately monitored based on the size of the standing wave ratio in practical engineering application, troubleshooting is carried out in time, the whole machine power amplifier is effectively prevented from being burnt out, the risk that the cost of a communication system of a whole machine plant is sharply increased is reduced, and the detection module is low in design cost and high in integration level.

Description

Technical Field

[0001] The present application relates to the field of radio frequency antenna technology, and in particular to a radio frequency transmission channel standing wave detection system and a control method thereof. Background Art

[0002] In the Beidou short message array anti-interference antenna technology, when transmitting signals, if the front-end antenna is not properly connected or fails, energy reflection will occur and standing waves will be generated; a standing wave ratio that is too large will affect the communication quality and even cause the communication equipment to burn out. Therefore, it is necessary to detect the standing wave ratio in the antenna equipment in real time to ensure the normal operation of the communication equipment and avoid system damage. In related technologies, the method of detecting the standing wave ratio is a detector + analog-to-digital converter mode. On the one hand, this method can only determine whether the standing wave ratio has changed, and cannot accurately measure the standing wave ratio and its changes. Details; on the other hand, the detector is costly, large in size, and highly integrated, which makes the detection cost of the standing wave ratio high, large in size, and low in integration.

[0003] Therefore, how to design a detection system that is not only highly integrated but also capable of accurately detecting the standing wave ratio is a technical problem that urgently needs to be solved. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present application provides a technical solution for standing wave detection in a radio frequency transmission channel to solve at least one of the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by this application is as follows.

[0006] According to a first aspect of an embodiment of the present application, a radio frequency transmission channel standing wave detection system is provided, comprising:

[0007] A detection module is connected to a bidirectional coupler in a radio frequency transmission channel, and detects a power signal generated by transmitting an excitation signal at a forward coupling end and a reverse coupling end of the bidirectional coupler;

[0008] A control module is connected to the RF transmission channel and the detection module, and a first input terminal thereof is connected to a transmission enable signal. The detection module is initialized and configured according to the transmission enable signal, and the RF transmission channel is controlled to transmit the excitation signal based on the transmission enable signal. The control module determines the standing wave ratio of the excitation signal based on the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end.

[0009] In one embodiment of the present application, the detection module includes two adjustable attenuators and a power conversion unit, the input end of the adjustable attenuator is connected to the bidirectional coupler, the output end of the adjustable attenuator is connected to the power conversion unit, a plurality of first channels are arranged in the power conversion unit, an automatic gain controller is arranged in the first channel, the input end of the first channel is connected to the output end of the corresponding adjustable attenuator, the output end of the first channel is connected to the second input end of the control module, and each first channel performs automatic gain adjustment on the power output by the adjustable attenuator.

[0010] In one embodiment of the present application, the control module includes a startup control unit and a signal processing unit, the startup control unit receives the transmit enable signal, controls each signal processor in the RF transmit channel to be in a working state according to the transmit enable signal to adjust the transmission power of the excitation signal, and generates an initialization signal according to the transmit enable signal, and initializes the detection module based on the initialization signal; the signal processing unit determines the standing wave ratio according to the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end.

[0011] In one embodiment of the present application, the control module is connected to the detection module via a serial peripheral interface.

[0012] According to a second aspect of an embodiment of the present application, a control method for a radio frequency transmission channel standing wave detection system is also provided, including:

[0013] Get the transmit enable signal;

[0014] generating an initialization signal based on the transmission enable signal, transmitting the excitation signal according to the transmission enable signal, and performing detection initialization according to the initialization signal;

[0015] The power signals generated by the forward coupling end and the reverse coupling end of the bidirectional coupler during the transmission of the excitation signal are detected, and the power signals are converted into corresponding gain values, so as to determine the standing wave ratio of the excitation signal transmission according to the gain value.

[0016] In one embodiment of the present application, the power signals generated by the forward coupling end and the reverse coupling end of the bidirectional coupler during the transmission of the excitation signal are detected, including: respectively obtaining the initial power signals of the forward coupling end and the reverse coupling end during the transmission of the excitation signal; adjusting the two initial power signals to a linear interval according to a linear gain adjustment range, and converting the adjusted power signals into gain values.

[0017] In one embodiment of the present application, converting the adjusted power signal into a gain value includes: automatically performing power-gain conversion on the adjusted power signal according to a power-gain mapping relationship to obtain a corresponding gain value.

[0018] In one embodiment of the present application, determining the standing wave ratio of the excitation signal transmission according to the gain value includes: determining a gain difference according to a gain value corresponding to the forward coupling end and a gain value corresponding to the reverse coupling end; and determining the standing wave ratio of the excitation signal transmission according to the gain difference.

[0019] In one embodiment of the present application, the relationship between the gain difference and the standing wave ratio is expressed as follows:

[0020] C=20*log10[(VSWR+1) / (VSWR-1)]

[0021] In the above expression, C is the gain difference and VSWR is the standing wave ratio.

[0022] The present application provides a radio frequency transmission channel standing wave detection system and a control method thereof, the standing wave detection system includes a detection module and a control module, the detection module detects the power signal generated by the forward coupling end and the reverse coupling end of the bidirectional coupler in the radio frequency transmission channel transmitting the excitation signal, the control module is connected to the radio frequency transmission channel and the detection module respectively, the control module receives the transmission enable signal, and initializes the configuration of the detection module according to the transmission enable signal, and controls the radio frequency transmission channel to transmit the excitation signal based on the transmission enable signal, and calculates the standing wave ratio of the excitation signal transmitted by the radio frequency transmission channel based on the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end. The radio frequency transmission channel standing wave detection system provided by the present application can accurately and effectively monitor the working state of the whole machine power amplifier based on the size of the standing wave ratio in actual engineering applications. If the standing wave ratio is relatively small, it indicates that the whole machine power amplifier is working normally. If the standing wave ratio deteriorates greatly, it indicates that the whole machine power amplifier is working abnormally, and it is necessary to timely troubleshoot the fault, effectively avoid the burning of the whole machine power amplifier, and reduce the risk of a sharp increase in the cost of the whole machine factory communication system. The design cost of the detection module is low and the integration is high.

[0023] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0025] Figure 1 is a schematic diagram of a standing wave detection system in the prior art;

[0026] Figure 2 is a block diagram of a radio frequency transmission channel standing wave detection system shown in an exemplary embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of a radio frequency transmission channel shown in an exemplary embodiment of the present invention;

[0028] Figure 4 is a specific structural diagram of a radio frequency transmission channel standing wave detection system shown in an exemplary embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of a transmission channel simulation shown in an exemplary embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of AGC gain values ​​of a power conversion unit under different power signals shown in an exemplary embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of multiple transmission standing wave ratios in a radio frequency transmission channel with antenna load mode shown in an exemplary embodiment of the present invention;

[0032] Figure 8 is a schematic diagram of multiple transmission standing wave ratios in an open-load mode of a radio frequency transmission channel shown in an exemplary embodiment of the present invention;

[0033] Fig. 9 It is a flow chart of a control method of a radio frequency transmission channel standing wave detection system shown in an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0037] SysCalc is a high-level simulation software developed specifically for RF circuit design and analysis.

[0038] The AGC gain value refers to the specific value used to adjust the signal gain in the Automatic Gain Control (AGC) system. AGC is a signal processing technology used to adjust the gain of the input signal at the receiving end to keep the signal within an appropriate strength range to prevent the signal from being too weak or too strong.

[0039] In the Beidou short message array anti-interference antenna technology, when the front-end antenna is not properly connected or fails during the transmission of the excitation signal, energy reflection will occur and standing waves will be generated; a large standing wave ratio will affect the communication quality and even cause the communication equipment to burn out. Therefore, it is necessary to detect the standing wave ratio in the antenna equipment in real time to ensure the normal operation of the communication equipment and avoid damage to the communication equipment. In related technologies, such as Figure 1 As shown in the figure, the current method of detecting the standing wave ratio is a mode in which a detector and an analog-to-digital converter are combined. The scheme designs a detector at the forward end and the reverse end of the bidirectional coupler respectively, detects the coupling power of the forward end and the reverse end through the detector, and then samples the voltage output by the detector through the analog-to-digital converter, and finally calculates the corresponding standing wave value through the processor. On the one hand, the existing standing wave detection mode can only determine whether the standing wave ratio changes, and cannot accurately measure the details of the standing wave ratio and its changes; on the other hand, the detector in the existing standing wave detection mode is high in cost, large in size, and high in integration, which makes the detection cost of the standing wave ratio high, large in size, and low in integration.

[0040] In order to solve the above problems, a technical solution for standing wave detection of a radio frequency transmission channel is provided, which includes a detection module and a control module. The detection module detects the power signal generated by the transmission of an excitation signal at both ends of a bidirectional coupler in the radio frequency transmission channel. The control module is connected to the radio frequency transmission channel and the detection module respectively. The control module receives and initializes the detection module according to a transmission enable signal, and controls the radio frequency transmission channel to transmit the excitation signal based on the transmission enable signal, and determines the standing wave ratio at the output end of the radio frequency transmission channel based on the power signals at both ends of the bidirectional coupler during the transmission of the excitation signal.

[0041] like Figure 2As shown, the present application provides a radio frequency transmission channel standing wave detection system, comprising:

[0042] The detection module is connected to the bidirectional coupler in the RF transmission channel to detect the power signal generated by the forward coupling end and the reverse coupling end of the bidirectional coupler transmitting the excitation signal;

[0043] The control module is connected to the RF transmission channel and the detection module, and its first input terminal is connected to the transmission enable signal. The detection module is initialized and configured according to the transmission enable signal, and the RF transmission channel is controlled to transmit the excitation signal based on the transmission enable signal. The control module determines the standing wave ratio of the transmission excitation signal based on the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end.

[0044] In an exemplary implementation of the present application, Figure 3 As shown, the signal processors arranged in sequence from the input end to the output end of the RF transmission channel include a digitally controlled attenuator, a low noise amplifier (LNA), a surface acoustic wave filter, a pre-push amplifier, a dielectric filter, a power amplifier, an isolator and a bidirectional coupler. Multiple filters are designed in the RF transmission channel to improve the EMC (Electro Magnetic Compatibility) performance and anti-interference ability of the transmission channel. In the RF transmission channel, a low insertion loss bidirectional coupler is arranged at the end of the channel to realize standing wave detection at the transmission output port.

[0045] In detail, the detection module includes two adjustable attenuators and a power conversion unit, the input end of the adjustable attenuator is connected to the bidirectional coupler, the output end of the adjustable attenuator is connected to the power conversion unit, a plurality of first channels are arranged in the power conversion unit, an automatic gain controller is arranged in the first channel, the input end of the first channel is connected to the output end of the corresponding adjustable attenuator, the output end of the first channel is connected to the second input end of the control module, and each first channel performs automatic gain adjustment on the power output by the adjustable attenuator. Specifically, as Figure 4As shown, the detection module includes two adjustable attenuators and a power conversion unit, the input end of the first adjustable attenuator is connected to the forward coupling end of the bidirectional coupler, the input end of the second adjustable attenuator is connected to the reverse coupling end of the bidirectional coupler, the power conversion unit includes four first channels, each first channel is provided with an automatic gain controller, the output end of the first adjustable attenuator is connected to the input end of the first first channel, the output end of the second adjustable attenuator is connected to the input end of the fourth first channel, the output ends of the four first channels are connected to the second input end of the control module, the power-gain automatic calculation is performed on the power output of the first adjustable attenuator through the first first channel to obtain the AGC gain value corresponding to the forward coupling end, the power-gain automatic calculation is performed on the power output of the second adjustable attenuator through the fourth first channel to obtain the AGC gain value corresponding to the reverse coupling end.

[0046] In more detail, the control module includes a start control unit and a signal processing unit, the start control unit receives a transmission enable signal, controls each signal processor in the RF transmission channel to be in a working state according to the transmission enable signal, so as to adjust the transmission power of the excitation signal, and generates an initialization signal according to the transmission enable signal, and initializes the detection module based on the initialization signal; the signal processing unit determines the standing wave ratio according to the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end. Specifically, the control module includes a start control unit and a signal processing unit, the start control unit receives a transmission enable signal sent by other devices, transmits the transmission enable signal to each signal processor in the RF transmission channel, so that each signal processor is in a working state, and adjusts the power of the excitation signal input in the RF transmission channel, and the control module generates an initialization signal according to the transmission enable signal to initialize the power conversion unit; the signal processing unit obtains multiple AGC gain values ​​output by the power conversion unit, and calculates the standing wave ratio output by the RF transmission channel according to the AGC gain value corresponding to the forward coupling end and the AGC gain value corresponding to the reverse coupling end.

[0047] Specifically, the control module is connected to the detection module via a serial peripheral interface. Figure 4 As shown, the control module and the power conversion unit transmit data via SPI (Serial Peripheral Interface), so that the control module sends an initialization signal to the power conversion unit via SPI, and obtains the AGC gain value output by the power conversion unit.

[0048] like Figures 2 to 8 As shown, the working principle of the RF transmission channel standing wave detection system provided by this application is as follows:

[0049] like Figure 2-Figure 3As shown, after receiving the transmission enable signal, the control module transmits the transmission enable signal to the RF transmission channel, sets the multiple signal processors in the RF transmission channel to the working state, and the control module also generates an initialization signal according to the transmission enable signal, and controls the detection module to perform initialization settings through the initialization signal. After the RF transmission channel works normally, the input excitation signal is transmitted through the multiple signal processors in the RF transmission channel, and then after passing through the bidirectional coupler, it is transmitted to the outside through the antenna element. During the transmission of the excitation signal, the forward coupling end and the reverse coupling end of the bidirectional coupler are detected by the detection module to obtain the power signals of the forward and reverse ports, and the power signals corresponding to the forward coupling port and the reverse coupling port are read by the control module to calculate the standing wave ratio of the RF transmission channel transmission process.

[0050] like Figure 4 As shown, the indicators of the bidirectional coupler can be selected as follows: operating frequency: 500MHz~2700MHz; forward coupling: 36dB; reverse coupling: 54dB; directivity: 18dB; insertion loss: ≤0.2dB@500MHz~2700MHz; withstand power: 200W (CW).

[0051] The excitation signal Lin input into the RF transmission channel is 0±1dBm, and the power of the output excitation signal is required to be L-OUT≥40dBm. Therefore, the power gain of the RF transmission channel must satisfy G≥41dB. Figure 5 As shown, select output P -1dB The final stage power amplifier is 45dBm, and the input P -1dB The transmission channel gain is 4dBm, the transmission channel gain is 41dB, the bidirectional coupler attenuates the transmission gain by 1dB, and the final output is P -1dB It is 44dBm.

[0052] The power conversion unit is a four-receive and one-transmit RF chip. The receiving channel frequency covers 1.1GHz to 2.5GHz, and the transmitting channel frequency covers 1.53GHz to 1.75GHz. The Beidou short message transmission frequency is 1624.524MHz. The first first channel and the fourth first channel in the power conversion unit are used to perform power detection on the forward / reverse coupling port respectively. The local oscillator frequency of the first first channel and the fourth first channel is configured to 1610MHz to ensure that the output intermediate frequency signal is 14.524MHz. The intermediate frequency digital AGC in the channel changes with the input signal. When the input power signal is different, the corresponding gain of the AGC is different, and the corresponding internal register value is also different, so as to obtain the signal strength of the forward / reverse coupling port, and finally the output standing wave ratio is obtained by calculating the return loss.

[0053] like Figure 6As shown, the gain value of the power conversion unit is different at different powers. Figure 6 It can be seen that when the input power signal of the first channel is between -93dBm and -23dBm, the AGC gain value is in a linear decreasing relationship with the input power signal. When the input power is less than -93dBm and greater than -23dBm, the AGC gain value no longer changes. Therefore, two adjustable attenuators are set in the detection module, and the power output from the forward coupling end and the reverse coupling end of the bidirectional coupler is adjusted to the linear working area of ​​the first channel through the two adjustable attenuators.

[0054] When the transmission enable signal is at a high level, the radio frequency transmission channel is turned on. Under the action of the input excitation signal, each signal processor in the radio frequency transmission channel works in a saturated state and transmits outward through the antenna; when the control module detects that the transmission enable signal is at a high level, the values ​​of the thirteenth to twenty-third bits of the first register in the first first channel and the values ​​of the second to twelfth bits of the seventy-second register in the fourth first channel are read; the high five bits of the thirteenth to twenty-third bits of the first register are converted into a decimal number multiplied by a coefficient of 1 and the low five bits are converted into a decimal number multiplied by a coefficient of 0.5, and the detection parameters of the forward coupling end are obtained, which are recorded as A; the high five bits of the second to twelfth bits of the seventy-second register are converted into a decimal number multiplied by a coefficient of 1 and the low five bits are converted into a decimal number multiplied by a coefficient of 0.5, and the detection parameters of the reverse coupling end are obtained, which are recorded as B; BA is used to obtain a detection difference (i.e., a gain difference) to calculate the corresponding standing wave ratio according to the expression relationship between the gain difference and the standing wave ratio.

[0055] If the input excitation signal of the RF transmission channel is 0dBm, according to the link gain of the RF transmission channel, the saturated output power of the transmission channel is ≥41dBm. Assuming the output power is 41dBm, and ignoring the insertion loss of the bidirectional coupler, according to the bidirectional coupler indicators, the coupling power of the forward coupling end is 5dBm, and the coupling power of the reverse coupling end is -13dBm. The power of the forward / reverse coupling end is in the nonlinear working area of ​​the power conversion unit, so the attenuation value of the adjustable attenuator of the forward / reverse output port is adjusted to 35dB, that is, the power entering the first first channel and the fourth first channel is -30dBm and -48dBm respectively. According to Figure 6 The linear relationship between the input power signal and the AGC gain value shows that the AGC gain value of the forward coupling end is 8dB, and the AGC gain value of the reverse coupling end is 26dB. The AGC gain value of the reverse coupling end is subtracted from the AGC gain value of the forward coupling end to obtain the gain difference.

[0056] Substitute the gain difference into C = 20*log10[(VSWR+1) / (VSWR-1)], where C is the gain difference and VSWR is the standing wave ratio, and the standing wave ratio of the output port during RF transmission channel transmission is calculated to be 1.28:1. When the load antenna is disconnected, the output power signal will theoretically be fully reflected, that is, the power at the forward / reverse coupling ends is the same. According to the standing wave ratio calculation formula, the standing wave ratio is ∞.

[0057] In practical applications, the RF transmission channel is affected by the isolation and linearity, and the power detection indication will have a certain offset. Figure 7 It is the standing wave detection value corresponding to 20 transmissions of the RF transmission channel in the loaded antenna mode. Figure 8 It is the standing wave detection value corresponding to 20 transmissions of the RF transmission channel in the open-circuit mode of the load antenna.

[0058] like Fig. 9 As shown, the present application also provides a control method for a radio frequency transmission channel standing wave detection system, which is applied to the radio frequency transmission channel standing wave detection system as described above, and the method at least includes steps S910 to S930:

[0059] S910, obtaining a transmission enable signal;

[0060] S920, generating an initialization signal based on the transmission enable signal, transmitting the excitation signal according to the transmission enable signal, and performing detection initialization according to the initialization signal;

[0061] S930, detecting power signals generated by the forward coupling end and the reverse coupling end of the bidirectional coupler during the transmission of the excitation signal, and converting the power signals into corresponding gain values, thereby determining the standing wave ratio of the excitation signal transmission according to the gain values.

[0062] In more detail, the power signals generated by the forward coupling end and the reverse coupling end of the bidirectional coupler during the transmission of the excitation signal are detected, including: respectively obtaining the initial power signals of the forward coupling end and the reverse coupling end during the transmission of the excitation signal; adjusting the two initial power signals to the linear interval according to the linear gain adjustment range, and converting the adjusted power signals into gain values. Specifically, the initial power signals of the forward coupling end and the reverse coupling end of the bidirectional coupler are obtained, the value of the initial power signal is adjusted to the linear working interval of the first channel through an adjustable attenuator, and the adjusted coupling power is converted into the AGC gain value through the first first channel and the fourth first channel.

[0063] In more detail, converting the adjusted coupling power into a gain value includes: converting the adjusted power signal into a gain value, including: automatically performing power-gain conversion on the adjusted power signal according to a power-gain mapping relationship to obtain a corresponding gain value. Specifically, Figure 6 As shown, the adjusted power signal is converted into an AGC gain value according to the automatic gain controller in the first first channel and the fourth first channel automatic gain controller.

[0064] In more detail, determining the standing wave ratio of the excitation signal transmission according to the gain value includes: determining a gain difference according to a gain value corresponding to the forward coupling end and a gain value corresponding to the reverse coupling end; and determining the standing wave ratio of the excitation signal transmission according to the gain difference. Specifically, the AGC gain value corresponding to the reverse coupling end of the bidirectional coupler is subtracted from the AGC gain value of the forward coupling end of the bidirectional coupler to obtain the gain difference, and the standing wave ratio of the excitation signal is calculated according to the gain difference by the control module.

[0065] In more detail, the relationship between the gain difference and the standing wave ratio is expressed as:

[0066] C=20*log10[(VSWR+1) / (VSWR-1)] (1)

[0067] In expression (1), C is the gain difference and VSWR is the standing wave ratio.

[0068] The present application provides a radio frequency transmission channel standing wave detection system and a control method thereof, the standing wave detection system includes a detection module and a control module, the detection module detects the power signal generated by the forward coupling end and the reverse coupling end of the bidirectional coupler in the radio frequency transmission channel transmitting the excitation signal, the control module is connected to the radio frequency transmission channel and the detection module respectively, the control module receives the transmission enable signal, and initializes the configuration of the detection module according to the transmission enable signal, and controls the radio frequency transmission channel to transmit the excitation signal based on the transmission enable signal, and calculates the standing wave ratio of the excitation signal transmitted by the radio frequency transmission channel based on the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end. The radio frequency transmission channel standing wave detection system provided by the present application can accurately and effectively monitor the working state of the whole machine power amplifier based on the size of the standing wave ratio in actual engineering applications. If the standing wave ratio is relatively small, it indicates that the whole machine power amplifier is working normally. If the standing wave ratio deteriorates greatly, it indicates that the whole machine power amplifier is working abnormally, and it is necessary to timely troubleshoot the fault to effectively avoid the burning of the whole machine power amplifier; the power signal processing range of the detection module is large, the detection accuracy is high, and it can effectively reduce the risk of a sharp increase in the cost of the whole machine factory communication system. The design cost of the detection module is low and the integration is high.

[0069] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A radio frequency transmission channel standing wave detection system, characterized in that: include: A detection module is connected to a bidirectional coupler in a radio frequency transmission channel, and detects a power signal generated by transmitting an excitation signal at a forward coupling end and a reverse coupling end of the bidirectional coupler; A control module is connected to the RF transmission channel and the detection module, and a first input terminal thereof is connected to a transmission enable signal. The detection module is initialized and configured according to the transmission enable signal, and the RF transmission channel is controlled to transmit the excitation signal based on the transmission enable signal. The control module determines the standing wave ratio of the excitation signal based on the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end.

2. The radio frequency transmission channel standing wave detection system according to claim 1, characterized in that: The detection module includes two adjustable attenuators and a power conversion unit, the input end of the adjustable attenuator is connected to the bidirectional coupler, the output end of the adjustable attenuator is connected to the power conversion unit, a plurality of first channels are arranged in the power conversion unit, an automatic gain controller is arranged in the first channel, the input end of the first channel is connected to the output end of the corresponding adjustable attenuator, the output end of the first channel is connected to the second input end of the control module, and each first channel performs automatic gain adjustment on the power output by the adjustable attenuator.

3. The radio frequency transmission channel standing wave detection system according to claim 2, characterized in that: The control module includes a startup control unit and a signal processing unit. The startup control unit receives the transmission enable signal, controls each signal processor in the RF transmission channel to be in a working state according to the transmission enable signal to adjust the transmission power of the excitation signal, and generates an initialization signal according to the transmission enable signal, and initializes the detection module based on the initialization signal; the signal processing unit determines the standing wave ratio according to the power signal corresponding to the forward coupling end and the power signal corresponding to the reverse coupling end.

4. The radio frequency transmission channel standing wave detection system according to claim 1, characterized in that: The control module is connected to the detection module via a serial peripheral interface.

5. A control method for a radio frequency transmission channel standing wave detection system, characterized in that: include: Get the transmit enable signal; generating an initialization signal based on the transmission enable signal, transmitting the excitation signal according to the transmission enable signal, and performing detection initialization according to the initialization signal; The power signals generated by the forward coupling end and the reverse coupling end of the bidirectional coupler during the transmission of the excitation signal are detected, and the power signals are converted into corresponding gain values, so as to determine the standing wave ratio of the excitation signal transmission according to the gain value.

6. The control method of the radio frequency transmission channel standing wave detection system according to claim 5, characterized in that: Detecting the power signal generated by the forward coupling end and the reverse coupling end of the bidirectional coupler during the transmission of the excitation signal includes: Respectively acquiring initial power signals of the forward coupling end and the reverse coupling end during the transmission of the excitation signal; The two initial power signals are adjusted to a linear interval according to a linear gain adjustment range, and the adjusted power signals are converted into gain values.

7. The control method of the radio frequency transmission channel standing wave detection system according to claim 6, characterized in that: Convert the adjusted power signal to a gain value, including: The adjusted power signal is automatically converted from power to gain according to the power-gain mapping relationship to obtain a corresponding gain value.

8. The control method of the radio frequency transmission channel standing wave detection system according to claim 6, characterized in that: Determining the standing wave ratio of the excitation signal transmission according to the gain value includes: Determine a gain difference according to a gain value corresponding to the forward coupling end and a gain value corresponding to the reverse coupling end; The standing wave ratio of the excitation signal transmission is determined according to the gain difference.

9. The control method of the radio frequency transmission channel standing wave detection system according to claim 8, characterized in that: The relationship between the gain difference and the standing wave ratio is expressed as follows: C=20*log10[(VSWR+1) / (VSWR-1)] In the above expression, C is the gain difference and VSWR is the standing wave ratio.

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