A method and device for detecting standing wave ratio of a multi-band system

Abstract

The present invention discloses a method and device for detecting standing wave ratio of a multi-band system. The method includes entering a power-on standing wave detection process, detecting the link status and standing wave ratio status of each frequency band; detecting whether to enter a manual standing wave detection process, including detecting whether a certain frequency band signal is selected and triggering a standing wave detection signal; if so, performing standing wave detection on the selected certain frequency band signal, and entering an automatic standing wave detection process after the detection is completed; if not, entering an automatic standing wave detection process; the automatic standing wave detection process includes real-time standing wave detection of signals of the full frequency band or the selected frequency band; executing a standing wave ratio value update and processing process, updating the standing wave ratio value and the standing wave ratio alarm status. The method and device of the present invention can quickly and accurately calculate the standing wave ratio value of a multi-band system, detect standing wave anomalies in time, and better protect the power amplifier. At the same time, any frequency band can be selected for standing wave detection, which greatly facilitates the test personnel to perform equipment maintenance.

Description

Technical Field

[0001] The present invention relates to the field of mobile communications, and in particular to a method and device for detecting standing wave ratio of a multi-band system. Background Art

[0002] Mobile communication technology has evolved rapidly from 1G to 2G, 3G, 4G, and now 5G, which has greatly promoted the explosive growth of wireless broadband data services such as the Internet and the Internet of Things. In order to meet the network service needs of different customers at the same time, signals of different standards are forced to coexist and cover. Nowadays, antenna sharing is a very common application scenario for multi-band, multi-standard mobile communications and wireless transmission networks of various operators. At present, for multi-band antenna sharing scenarios, when performing standing wave ratio detection, there are the following problems: (1) Only a specific frequency band can be selected as the basis for standing wave ratio calculation. In the actual operation process, once an abnormality occurs on the link of this frequency band, the standing wave ratio calculation cannot be completed, resulting in abnormal conditions such as false alarms or failure to detect, which brings great inconvenience to engineering applications; (2) In normal operation, the signals of each frequency band will have a state of more violent signal jumps in time and amplitude according to the actual number of users, standards, number of carriers, etc., making power detection more difficult. For example, patent 202011083882.4 "A standing wave ratio detection system, method and radio frequency remote unit with the system" proposes to use the method of related power detection to extract power in this situation to overcome the problems of power jump and feedback / reflection channel time-division multiplexing. However, the implementation complexity of this method is relatively high, and the actual logic implementation consumes a lot of resources, which is not easy to use in real-time systems; (3) The system utilization rate is low and the implementation complexity is high. For example, patent 201510334974.8 "Detection device and method for multi-frequency combiner" realizes the switching detection of multiple channels by introducing a filter unit and a single-chip microcomputer control unit in the combiner. This increases the design difficulty and complexity of the multiplexer. In actual applications, multiple frequency bands usually share one output port, so there is no need to complete the addition of detection circuits for each frequency band. Therefore, in this design scheme, the system utilization rate is low and the complexity is high. (4) For situation 2, there is a solution in the prior art to improve the accuracy of the standing wave ratio detection method by increasing the standing wave ratio detection period. The effect may be more obvious for multi-periodic signals, but it is still difficult to guarantee its accuracy for the non-periodic characteristics of engineering signals, and it also brings the problem of long standing wave detection period. There are two problems: one is that the update is not timely, or it may cause irreversible damage to the power amplifier; the other is that the sampling time of a certain period of time may be staggered due to signal jump, resulting in false detection, and then the power amplifier is mistakenly shut down. Summary of the invention

[0003] According to one aspect of the present invention, a method for detecting standing wave ratio of a multi-band system is provided, comprising: entering a power-on standing wave detection process to detect a link status and a standing wave ratio status of each frequency band;

[0004] Detect whether to enter the manual standing wave detection process, including detecting whether a certain frequency band signal is selected and the standing wave detection signal is triggered;

[0005] If yes, perform standing wave detection on the selected frequency band signal, and after the detection is completed, enter the automatic standing wave detection process;

[0006] If not, enter the automatic standing wave detection process;

[0007] The automatic standing wave detection process includes performing real-time standing wave detection on signals of the full frequency band or the selected frequency band;

[0008] Execute the VSWR value update and processing flow, and update the VSWR value and VSWR alarm status.

[0009] In some implementations, the step of entering the power-on standing wave detection process to detect the link status and standing wave ratio status of each frequency band includes:

[0010] Generate fixed signal Tx output to the links of each frequency band;

[0011] Read the feedback power Fb of the signal in each frequency band;

[0012] Determine whether the absolute difference between the feedback power Fb of the signal of each frequency band and the power of the fixed signal Tx is less than a first threshold value;

[0013] If yes, set the link status of the corresponding frequency band to normal;

[0014] If not, set the link status of the corresponding frequency band to abnormal.

[0015] In some implementations, setting the link status of the corresponding frequency band to normal includes:

[0016] Read the reflected power Re of the signal in each frequency band;

[0017] Calculate the standing wave ratio of each frequency band signal according to the transmission power Re and feedback power Fb of each frequency band signal and display it on the graphical user interface;

[0018] The step of setting the link status of the corresponding frequency band to abnormal includes:

[0019] Shut down the power amplifier unit of the abnormal link of the system;

[0020] The abnormal link amplifier fault alarm and VSWR status displayed in the graphical user interface cannot be detected.

[0021] In some embodiments, the step of calculating the standing wave ratio of each frequency band signal according to the transmission power Re and the feedback power Fb of each frequency band signal and displaying it on a graphical user interface includes:

[0022] Among the standing wave ratio values ​​of various frequency bands, a frequency band whose standing wave ratio value is less than a preset standing wave threshold is selected as a selected frequency band for the automatic standing wave detection process and displayed on a graphical user interface.

[0023] In some implementations, performing standing wave detection on a selected frequency band signal and entering into an automatic standing wave detection process after the detection is completed includes:

[0024] Generate a fixed signal Tx output to the link of the selected frequency band;

[0025] Read the feedback power Fb of the signal in the selected frequency band;

[0026] Determine whether the absolute difference between the feedback power Fb of the signal of the frequency band and the power of the fixed signal Tx is less than a first threshold value;

[0027] If yes, set the link status of the frequency band to normal;

[0028] Read the reflected power Re of the selected frequency band signal;

[0029] Calculate the standing wave ratio value of the selected frequency band signal according to the transmission power Re and feedback power Fb of the selected frequency band signal;

[0030] Execute the VSWR value update and processing flow;

[0031] Enter automatic standing wave detection;

[0032] If not, set the link status of the selected frequency band to abnormal;

[0033] Turn off the power amplifier units corresponding to all frequency band links;

[0034] The link amplifier fault alarm and VSWR status of the selected frequency band cannot be detected in the graphical user interface.

[0035] In some embodiments, the automatic standing wave detection process includes performing real-time standing wave detection on signals of the entire frequency band or the selected frequency band, updating the standing wave ratio value and the standing wave ratio alarm status, including:

[0036] Set the link of the full band or selected band to the mode of receiving external input signal;

[0037] Set the standing wave ratio calculation period;

[0038] Reading the feedback power Fb and the reflected power Re at a first time interval within the standing wave ratio calculation period;

[0039] Take out the maximum feedback power maxFbPwr and the second largest feedback power subFbPwr in this cycle to calculate the average feedback power agvFbPwr;

[0040] Take out the maximum reflected power maxRePwr and the second largest reflected power subRePwr in this cycle to calculate the average reflected power agvRePwr;

[0041] The standing wave ratio value vswr1 is calculated by the maximum feedback power maxFbPwr and the maximum reflected power maxRePw;

[0042] The standing wave ratio value vswr2 is calculated by the second largest feedback power subFbPwr and the second largest reflected power subRePwr;

[0043] The standing wave ratio value vswr3 is calculated by the average feedback power agvFbPwr and the average reflected power agvRePwr;

[0044] The minimum value of vswr1, vswr2 and vswr3 is taken as the latest calculated standing wave ratio value.

[0045] In some implementations, reading the feedback power Fb and the reflected power Re at a first time interval within the standing wave ratio calculation period includes:

[0046] Calculate the current output power, output power = feedback power Fb + output power bias + feedback attenuation; and compare whether the current output power is greater than the rated power minus the second threshold value;

[0047] If yes, record the currently read feedback power Fb and reflected power Re;

[0048] If not, the currently read feedback power Fb and reflected power Re are not recorded, and the feedback power Fb and reflected power Re at the next moment are read continuously.

[0049] In some embodiments, taking the minimum value of vswr1, vswr2, and vswr3 as the latest calculated standing wave ratio value comprises:

[0050] Determine whether the fluctuation range of the feedback power Fb within the standing wave ratio calculation period is greater than a third threshold value;

[0051] If not, it is judged as a stable signal, the statistical cycle is set to 1, the VSWR value calculated this time is taken out, and the VSWR value update and processing flow is executed;

[0052] If yes, it is judged as an unstable signal, and the statistical cycle is set to P times to determine whether P standing wave ratio values ​​are counted;

[0053] If so, determine whether there are Q standing wave ratio values ​​greater than the standing wave threshold; where 0≤PQ≤5;

[0054] If so, take the last standing wave ratio value greater than the standing wave threshold, and execute the standing wave ratio value update and processing flow;

[0055] If not, take the last standing wave ratio value that is less than the standing wave threshold, and execute the standing wave ratio value update and processing flow.

[0056] In some implementations, the step of updating and processing the standing wave ratio value includes:

[0057] Determine whether the difference between the standing wave ratio value of the current round of detection and the standing wave ratio value of the previous round of detection is greater than a fourth threshold value;

[0058] If yes, the VSWR value of this round of detection is adopted and displayed on the graphical user interface;

[0059] If not, the VSWR value of the previous round of detection is adopted and displayed on the graphical user interface;

[0060] Determine whether the standing wave ratio value is greater than the standing wave threshold;

[0061] If yes, shut down the power amplifier units of all frequency bands and report a standing wave alarm;

[0062] If not, clear the standing wave alarm.

[0063] According to a second aspect of the present invention, a multi-band system standing wave ratio detection device is provided, which uses the multi-band system standing wave ratio detection method as described above.

[0064] Beneficial effects of the present invention: The method and device of the present invention overcome the shortcomings of standing wave ratio detection in the existing multi-band antenna sharing scenario. The method and device proposed by the present invention can quickly and accurately calculate the standing wave ratio value of the multi-band system, timely discover standing wave anomalies, and better protect the power amplifier. At the same time, any frequency band can be selected for standing wave detection, which greatly facilitates test personnel to perform equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 This is a schematic structural diagram of a multi-band system standing wave ratio detection device according to Embodiment 1 of the present invention;

[0066] Figure 2 A signal flow diagram of a link of a multi-band system standing wave ratio detection device according to Embodiment 1 of the present invention;

[0067] Figure 3 This is a flow chart of a method for detecting standing wave ratio of a multi-band system according to a second embodiment of the present invention;

[0068] Figure 4It is a flow chart of a power-on standing wave ratio detection process of a multi-band system standing wave ratio detection method according to the second embodiment of the present invention;

[0069] Figure 5 It is a flow chart of a manual standing wave ratio detection process of a multi-band system standing wave ratio detection method according to Embodiment 2 of the present invention;

[0070] Figure 6 A flowchart of a standing wave ratio value update and processing flow of a multi-band system standing wave ratio detection method according to a second embodiment of the present invention;

[0071] Figure 7 It is a flow chart of the automatic standing wave detection process of the multi-band system standing wave ratio detection method according to the second embodiment of the present invention;

[0072] Figure 8 This is a flow chart of the automatic standing wave ratio detection process of the multi-band system standing wave ratio detection method according to the third embodiment of the present invention. DETAILED DESCRIPTION

[0073] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, methods, products or apparatus.

[0075] Embodiment 1

[0076] Figure 1 A multi-band system standing wave ratio detection device according to an embodiment of the present invention is schematically shown. As shown in the figure, the device includes a monitoring module 100 with a standing wave ratio detection function and multiple links, each link corresponds to a frequency band signal input, and each link includes a signal generator 210, a signal link control unit 220, a power calculation unit 230, a DPD control unit 240 (DPD, Digital Pre-Distortion, digital pre-distortion), an AD / DA control unit 250, a frequency band signal transceiver unit 260 and a power amplifier unit 270. The device also includes a multi-band combining unit 280, and the power amplifier unit 270 of each link is connected to the multi-band combining unit 280.

[0077] See also Figure 2 , Figure 2 The signal flow diagram of one link is shown, and the signal flow of other links not shown is the same. Figure 2 Explain the working principle of the device power harvesting.

[0078] like Figure 2 As shown, downlink: the signal generator 210 has an external signal access unit 211 and an internal signal generating unit 212. The external signal access unit 211 directly transmits the external signal to the subsequent part of the link, and the internal signal generating unit 212 can generate a fixed signal to transmit to the subsequent part of the link. The signal link control unit 220 can select the mode of the signal generator 210, control whether it outputs an external signal or an internal signal, and then output the selected signal to the power calculation unit 230 and the DPD control unit 240 respectively. The power calculation unit 230 calculates the power of the signal in real time, and the DPD control unit 240 realizes signal cancellation to improve system efficiency. The signal output by the DPD control unit 240 is then output to the frequency band signal transceiver unit 260, and then enters the power amplifier unit 270 to amplify the signal. Finally, the signals of each frequency band are converged to the multi-band combiner unit 280, and are output from the output / input port together and then covered to the area through the antenna feed unit.

[0079] like Figure 2 As shown, reflection branch: after the output / input port transmits the RF signal through the antenna feed unit, part of the RF signal will return to the power amplifier unit 270 from the antenna feed unit through the output / input port and the multi-band combiner unit 280 through the reflection branch due to factors such as output / input port mismatch, antenna, and feeder failure, and then enter the frequency band signal transceiver unit 260, and then pass through the DPD control unit 240, and then enter the power calculation unit 230. The power calculation unit 230 calculates the power of the reflected signal in real time.

[0080] like Figure 2 As shown, feedback branch: in order to more accurately measure the system output power, the power amplifier unit 270 copies and separates the output signal, and the separated signal is output to the multi-band combining unit 280, and the other separated signal enters the frequency band signal transceiver unit 260 through the feedback branch, and then passes through the DPD control unit 240, and then enters the power calculation unit 230. The power calculation unit 230 calculates the power of the feedback signal in real time.

[0081] like Figure 1 As shown, the monitoring module 100 includes a GUI graphical user interface control unit 110 , a power-on multi-band standing wave detection unit 120 , a manual standing wave detection unit 130 , an automatic standing wave detection unit 140 and a monitoring interaction control module 150 .

[0082] The GUI graphical user interface control unit 110 is bidirectionally connected to the power-on multi-band standing wave detection unit 120, the manual standing wave detection unit 130 and the automatic standing wave detection unit 140 respectively; the power-on multi-band standing wave detection unit 120, the manual standing wave detection unit 130 and the automatic standing wave detection unit 140 are connected in sequence; the power-on multi-band standing wave detection unit 120, the manual standing wave detection unit 130 and the automatic standing wave detection unit 140 are also bidirectionally connected to the monitoring interaction control module 150 respectively; the monitoring interaction control module 150 is also connected to each link of the detection device. The power-on multi-band standing wave detection unit 120 is used to execute the power-on standing wave detection process, the manual standing wave detection unit 130 is used to execute the manual standing wave detection process, and the automatic standing wave detection unit 140 is used to execute the automatic standing wave detection process. The power-on multi-band standing wave detection unit 120, the manual standing wave detection unit 130 and the automatic standing wave detection unit 140 can control the monitoring interaction control module 150 to control each module of the system according to the corresponding detection process (including parameter configuration, power amplifier switch, etc.). The GUI graphical user interface control unit 110 has a graphical user interface that can display relevant information, parameters, etc., and also has relevant control icons. The tester can enter user instructions by clicking the control icon.

[0083] Each frequency band can perform standing wave detection and update in parallel at the same time, or can perform standing wave detection and update in serial in time-sharing. Combined with the GUI graphical user interface control unit 110, the power-on multi-band standing wave detection unit 120, the manual standing wave detection unit 130 and the automatic standing wave detection unit 140, a complete multi-band system standing wave detection solution is formed.

[0084] Embodiment 2

[0085] See also Figure 3 , Figure 3 The present invention is a flowchart of a method for detecting standing wave ratio of a multi-band system disclosed in an embodiment of the present invention. The method for detecting standing wave ratio of a multi-band system can be applied to a mobile communication system, but the present invention is not limited to the application system. Figure 3 As shown, the multi-band system standing wave ratio detection method may include the following operations:

[0086] like Figure 4 As shown, S10: entering the power-on standing wave ratio detection process to detect the link status and standing wave ratio status of each frequency band.

[0087] The power-on standing wave detection process is equivalent to the self-test after the system is powered on. The purpose is to detect the integrity of the system internal and external antenna feeder connections. The power-on standing wave detection process specifically includes:

[0088] S11: Initialize the system.

[0089] After the device is powered on, the powered-on multi-band standing wave detection unit 120 configures the AD / DA control unit 2501…n, including information such as frequency point and frequency band bandwidth, through the monitoring interactive control module 150, and sets the transmission and receiving gains of the link so that the difference between the transmission signal power and the feedback signal power is within 3dB. On the one hand, it meets the signal cancellation performance requirements of the DPD control unit 240, and on the other hand, it determines whether the power amplifier unit 270 has output through the feedback power, thereby confirming whether the link is normal.

[0090] S12: Generate a fixed signal Tx and output it to the links of each frequency band.

[0091] The internal signal generating unit 212 of the signal generator 2101…n is turned on, and a fixed signal Tx dBm is generated whose transmission power is 12 dB less than the full power, so that the transmission power can not only meet the standing wave ratio calculation requirement, but also avoid the power amplifier unit 270 from being damaged due to excessive signal, and then the signal link control unit 2201…n is turned to the internal signal mode.

[0092] S13: Turn on the power amplifier switch of the power amplifier unit 2701…n, so that the fixed signal in the above step enters the power amplifier unit 2701…n, one way is divided to the multi-band combining unit 280, and the other way is divided to the feedback branch, and then the receiving end of the power amplifier unit 2701…n is switched to the feedback branch, so that the feedback signal goes along the receiving end link, passes through the frequency band signal transceiver unit 2601…n, the DPD control unit 2401…n, and finally enters the power calculation unit 2301…n.

[0093] S14: Read the feedback power Fb of the signal in each frequency band.

[0094] After the feedback link signal is transmitted to the power calculation units 2301 . . . n, the multi-band standing wave detection unit 120 is powered on to collect the feedback power Fb dBm of the power calculation units 2301 . . . n at this time.

[0095] S15: Determine whether the absolute difference between the feedback power Fb of the signal of each frequency band and the power of the fixed signal Tx is less than a first threshold value;

[0096] Compare whether the absolute difference ΔDv between the power of the fixed signal Tx and the feedback power Fb of the frequency band 1...n is less than the first threshold value. According to the requirement that the difference between the transmitted signal power and the feedback signal power is less than 3dB in step S11 and the error factor, the typical value of the first threshold value is 8dB. This is only used as an example. The range of the first threshold value can be adjusted in actual applications.

[0097] S151: If yes, the link status of the corresponding frequency band is set to normal, that is, the absolute difference ΔDv between the fixed signal Tx and the feedback power Fb of the corresponding frequency band is less than 8dB, then the link status of the frequency band is normal, and the normal link continues to perform the standing wave ratio detection step, including:

[0098] S1511: Switch the receiving end of the power amplifier unit 2701 ... n to the reflection branch;

[0099] S1511: Read the reflected power Re of the signal in each frequency band;

[0100] When powered on, the multi-band standing wave detection unit 120 collects the reflected power dBm of the power calculation units 2301 . . . n.

[0101] S1512: Calculate the standing wave ratio value of each frequency band signal according to the transmission power Re and feedback power Fb of each frequency band signal and display it on the graphical user interface;

[0102] The power-on multi-band standing wave detection unit 120 derives the standing wave ratio vswr1 ... n of each frequency band according to the feedback power Fb dBm and the reflected power Re dBm. The derivation process can be found in public documents and will not be repeated here.

[0103] S1513: Among the standing wave ratio values ​​vswr1 . . . n of each frequency band, a frequency band whose standing wave ratio value is less than a preset standing wave threshold is selected as the selected frequency band for the automatic standing wave detection process and displayed on the graphical user interface, thereby ending the power-on standing wave detection process.

[0104] A frequency band is selected as the selected frequency band of the automatic standing wave detection process (as a test option) because the detection device in the present invention is a multi-band sharing an input / output port. In theory, each frequency band can reflect the standing wave ratio of the port, so finally select a standing wave ratio to reflect and display it on the user interface.

[0105] S152: If not, set the link status of the corresponding frequency band to abnormal.

[0106] S1521: shut down the power amplifier unit 270 of the abnormal link of the system;

[0107] S1522: Displaying an abnormal link amplifier fault alarm and a standing wave ratio status that cannot be detected on the graphical user interface, and ending the power-on standing wave detection process of the abnormal frequency band.

[0108] The power-on standing wave detection process is for full-band detection. By sending a fixed signal internally, the standing wave ratio can be detected within seconds and the standing wave ratio value can be quickly displayed. This is different from connecting to an external signal. It requires multiple sampling feedback and reflected power to calculate the standing wave ratio. At the same time, by feedback whether the power size is normal, it is possible to quickly locate whether the power amplifier is faulty and report a fault alarm. Furthermore, if the standing wave ratio detected in a certain frequency band is abnormal, such as if no load is connected, the signal is basically fully reflected, the standing wave ratio will be very large, and it will be discovered in time. At this time, effective measures are taken to immediately turn off the power amplifier switch to prevent the power amplifier from being damaged for a long time.

[0109] like Figure 5 As shown, S20: detecting whether to enter the manual standing wave detection process, including detecting whether a certain frequency band signal is selected and a standing wave detection signal is triggered.

[0110] After completing the power-on standing wave detection process, monitor the status of the standing wave detection button (which can be the control icon in the GUI) in real time. Clicking the standing wave detection button can trigger the standing wave detection signal. If the GUII graphical user interface control unit selects a certain frequency band m and triggers the standing wave detection button (triggering the standing wave detection signal), the manual standing wave detection process is executed first, otherwise the automatic standing wave detection process is executed.

[0111] S21: If yes, perform standing wave detection on the selected frequency band m signal, and enter the automatic standing wave detection process after the detection is completed. The manual standing wave detection process includes:

[0112] S211: Generate a fixed signal Tx and output it to the link of the selected frequency band;

[0113] The internal signal generating unit 212 of the signal generator m is turned on to generate a fixed signal Tx, and the signal link control unit m is switched to the internal mode.

[0114] S212: Turn on the power amplifier switch of the power amplifier unit m, and switch the receiving end of the power amplifier unit m to the feedback branch.

[0115] S213: Read the feedback power Fb of the signal in the selected frequency band.

[0116] After the feedback link signal is transmitted to the power calculation unit m, the manual standing wave detection unit 130 collects the feedback power Fb dBm of the power calculation unit m at this time.

[0117] S214: Determine whether the absolute difference between the feedback power Fb of the signal of the frequency band and the power of the fixed signal Tx is less than a first threshold value;

[0118] Compare whether the absolute difference ΔDv between the power of the fixed signal Tx of the frequency band m and the feedback power Fb is less than a first threshold value. The typical value of the first threshold value is 8 dB. This is only an example. The range of the first threshold value can be adjusted in actual applications.

[0119] S2141: If yes, the link status of the frequency band is set to normal, that is, the absolute difference ΔDv between the fixed signal Tx and the feedback power Fb of the frequency band m is less than 8 dB, then the link status of the frequency band m is normal, and the step of continuing to perform the standing wave ratio detection includes:

[0120] S21411: Switch the receiving end of the power amplifier unit m to the reflection branch;

[0121] S21412: Read the reflected power Re of the signal in frequency band m;

[0122] The manual standing wave detection unit 130 collects the reflected power dBm of the power calculation unit m at this time.

[0123] S21413: Calculate the standing wave ratio value of the selected frequency band signal according to the transmission power Re and feedback power Fb of the frequency band m;

[0124] The manual standing wave detection unit 130 derives the standing wave ratio vswr of the frequency band m according to the feedback power Fb dBm and the reflected power Re dBm of the frequency band m. The derivation process can be found in public documents and will not be repeated here.

[0125] like Figure 6 As shown, S40: execute the standing wave ratio value update and processing flow.

[0126] S41: Determine whether the difference between the standing wave ratio value detected in this round and the standing wave ratio value detected in the previous round is greater than a fourth threshold value.

[0127] The fourth threshold is usually set to 0.5, which determines the difference between the VSWR value of the current round of detection and the VSWR value of the previous round of detection, ΔR vswr Is it greater than 0.5? Set the difference of standing wave ratio value ΔR vswr The purpose of comparison with the fourth threshold value is to avoid frequent updating of the standing wave ratio value. The standing wave ratio value in this embodiment is only a specific application example. The range of the fourth threshold value can be adjusted in actual application.

[0128] S411: If yes, use the standing wave ratio value of this round of detection;

[0129] S412: If not, use the standing wave ratio value of the previous round of detection.

[0130] S42: Display the VSWR value on the graphical user interface.

[0131] S43: Determine whether the standing wave ratio value is greater than the standing wave threshold;

[0132] S431: If yes, turn off the power amplifier units 270 of all frequency bands and report a standing wave alarm;

[0133] S432: If not, clear the standing wave alarm.

[0134] End the manual standing wave detection process and enter the automatic standing wave detection process.

[0135] S2142: If not, setting the link status of the selected frequency band to abnormal;

[0136] S21421: Turn off the power amplifier units 270 corresponding to all frequency band links;

[0137] S21422: Displaying a power amplifier fault alarm and a standing wave ratio status that cannot be detected for the selected frequency band m link on the graphical user interface, and ending the manual standing wave ratio detection process for the frequency band m.

[0138] The manual standing wave detection process can quickly detect the link status and standing wave ratio status, and present them to the debugger to quickly locate the problem. The manual standing wave detection process can be targeted at any frequency band (the debugger can select it through the GUI graphical user interface control unit 110), but only one frequency band can be operated at the same time.

[0139] S22: If not, enter the automatic standing wave detection process.

[0140] The manual standing wave detection process requires human intervention triggering (selecting the frequency band and triggering the standing wave detection signal). If the selected frequency band and the triggering standing wave detection signal are not detected, the manual standing wave detection process will not be executed.

[0141] like Figure 7 As shown, S30: the automatic standing wave detection process includes performing real-time standing wave detection on signals of the full frequency band or the selected frequency band.

[0142] The selected frequency band in the automatic standing wave detection process may be the frequency band m selected in step S1413 of the power-on standing wave detection process, or may be the frequency band m selected in step S20 of the manual standing wave detection process.

[0143] The automatic standing wave detection process can also be for full-band detection. When it is displayed on the user interface, the frequency band to be detected can be selected according to the user's specific needs. In the actual application process, it is inevitable that some frequency bands will not be able to detect standing waves. At this time, the device will select a normal frequency band as the basis for standing wave detection.

[0144] Furthermore, the frequency band m selected in the manual standing wave detection process is used as a detection option for the automatic standing wave detection. The automatic standing wave detection process includes:

[0145] S31: setting the link of the selected frequency band m to a mode of receiving an external input signal;

[0146] The external signal access unit 211 of the signal generator m is turned on to receive an external input signal, the signal link control unit m is switched to the external mode, the switch of the power amplifier unit m of the frequency band m is turned on, and the standing wave detection is enabled.

[0147] S32: Setting the standing wave ratio calculation period;

[0148] The standing wave ratio calculation period is set by the automatic standing wave detection unit 140 , and is usually set to 3 minutes. This is only an example, and the value of the standing wave ratio calculation period can be adjusted in actual applications.

[0149] S33: reading the feedback power Fb and the reflected power Re at a first time interval within the standing wave ratio calculation period;

[0150] In this embodiment, the first time interval is usually set to 2 seconds, that is, the feedback power Fb and the reflected power Re are read in sequence every 2 seconds in the 3-minute standing wave ratio calculation cycle. The first time interval is set to 2 seconds for example, and the value of the first time interval can be adjusted in actual applications.

[0151] Furthermore, each time the values ​​of the feedback power Fb and the reflected power Re are read, the following steps are also included:

[0152] S331: Calculate current output power;

[0153] Output power OutPwr = feedback power Fb + output power offset ΔOutPwr + feedback attenuation FbAtt;

[0154] S332: Compare whether the current output power OutPwr is greater than the rated power RatePwr minus the second threshold value;

[0155] The second threshold value is usually set to 13 dB, which is only used as an example. In actual applications, the range of the second threshold value can be adjusted.

[0156] Output power OutPwr>rated power RatePwr-13.

[0157] If yes, record the currently read feedback power Fb and reflected power Re;

[0158] If not, the currently read feedback power Fb and reflected power Re are not recorded, and the feedback power Fb and reflected power Re at the next moment are read continuously.

[0159] The feedback power Fb and reflected power Re are recorded only when the output power OutPwr>rated power RatePwr-second threshold value in order to improve the detection accuracy. If the output power is too low, the feedback power Fb will also be too low, then the feedback and reflection will not reflect the difference, and the calculated standing wave ratio value will be inaccurate. Therefore, the output power needs to reach a certain value to calculate the accurate standing wave ratio value using the recorded power value.

[0160] Repeatedly read several feedback powers and reflected powers until 3 minutes later, completing the power acquisition of one standing wave ratio calculation cycle.

[0161] S34: taking out the maximum feedback power maxFbPwr and the second largest feedback power subFbPwr in this cycle to calculate the average feedback power agvFbPwr;

[0162] The maximum reflected power maxRePwr and the second maximum reflected power subRePwr in this period are taken out to calculate the average reflected power agvRePwr.

[0163] S35: Calculate the standing wave ratio value vswr1 by using the maximum feedback power maxFbPwr and the maximum reflected power maxRePw;

[0164] The standing wave ratio value vswr2 is calculated by the second largest feedback power subFbPwr and the second largest reflected power subRePwr;

[0165] The standing wave ratio value vswr3 is calculated by the average feedback power agvFbPwr and the average reflected power agvRePwr.

[0166] S36: Take out the minimum value of vswr1, vswr2 and vswr3 as the latest calculated standing wave ratio value.

[0167] By calculating three standing wave ratio values ​​by collecting the maximum value, the second largest value and the average value of the power, it is possible to cope with the signal fluctuation in practical applications and greatly improve the accuracy of standing wave detection. In the prior art, the standing wave ratio value is usually calculated by taking the average value after removing the maximum and minimum values ​​from multiple collected powers. This averaging method has natural drawbacks when dealing with TDD beating signal conditions. In order to overcome this problem, the present invention introduces the calculation method of the maximum value, the second largest value, and the average value of the maximum value and the second largest value. At the same time, multiple calculation methods of the maximum value, the second largest value and the average value of the two are used to reduce the volatility error caused by a single calculation method. Three calculation methods are used to obtain more accurate results, rather than a fixed one in the prior art. In the embodiment of the present invention, multiple calculation methods are used. Even if it is an unstable signal, a relatively accurate standing wave ratio can still be calculated within a specified period.

[0168] S40: Execute the standing wave ratio value update and processing flow to update the standing wave ratio value and the standing wave ratio alarm status.

[0169] S41: Determine whether the difference between the standing wave ratio value detected in this round and the standing wave ratio value detected in the previous round is greater than a fourth threshold value.

[0170] The fourth threshold is usually set to 0.5, which determines the difference between the VSWR value of the current round of detection and the VSWR value of the previous round of detection, ΔR vswr Is it greater than 0.5? Set the difference of standing wave ratio value ΔR vswr The purpose of comparison with the fourth threshold value is to avoid frequent updating of the standing wave ratio value. The standing wave ratio value in this embodiment is only a specific application example. The range of the fourth threshold value can be adjusted in actual application.

[0171] S411: If yes, use the standing wave ratio value of this round of detection;

[0172] S412: If not, use the standing wave ratio value of the previous round of detection.

[0173] S42: Display the VSWR value on the graphical user interface.

[0174] S43: Determine whether the standing wave ratio value is greater than the standing wave threshold;

[0175] S431: If yes, turn off the power amplifier units 270 of all frequency bands and report a standing wave alarm;

[0176] S432: If not, clear the standing wave alarm.

[0177] The method of this embodiment sets up a power-on standing wave detection process, a manual standing wave detection process, an automatic standing wave detection process, and a standing wave ratio update and processing process. In view of the problems existing in the prior art, a complete set of standing wave detection methods for multi-band systems is systematically provided. The method proposed in the present invention overcomes the shortcomings of the standing wave ratio detection in the existing multi-band antenna sharing scenario. The method proposed in the present invention can quickly and accurately calculate the standing wave ratio value of the multi-band system, detect standing wave anomalies in time, and better protect the power amplifier. At the same time, any frequency band can be selected for standing wave detection, which greatly facilitates the test personnel to perform equipment maintenance.

[0178] Embodiment 3

[0179] See also Figure 8 , Figure 8 This is a flow chart of another method for detecting standing wave ratio of a multi-band system disclosed in an embodiment of the present invention. The following only describes the differences from the method of the second embodiment, and the same steps are not repeated here.

[0180] In the automatic standing wave process of the second embodiment, after step S36: taking the minimum value of vswr1, vswr2 and vswr3 as the latest calculated standing wave ratio value, the following steps are also included:

[0181] like Figure 8 As shown, S37: determine whether the fluctuation range of the feedback power Fb within the standing wave ratio calculation period is greater than the third threshold value;

[0182] The typical value of the third threshold value is 5dB. The third threshold value in this embodiment is only a specific application example. The range of the third threshold value can be adjusted in practical applications. The comparison between the fluctuation range of the feedback power Fb within a cycle (the difference between the maximum value and the minimum value) and the third threshold value is set to further improve the accuracy of the standing wave ratio calculation. Considering that the reflected power and the feedback power are asynchronous acquisition mechanisms when the signal fluctuation is very large, the accuracy of the standing wave ratio calculation will be affected. Therefore, the fluctuation range of the feedback power is set to be compared with the third threshold value to determine whether the signal is stable, and then different algorithms are used to calculate the standing wave ratio according to the stable signal and the unstable signal.

[0183] S371: If not, it is determined to be a stable signal and the statistical cycle is set to 1;

[0184] S3711: Get the standing wave ratio value calculated this time;

[0185] S40: Execute the standing wave ratio value update and processing flow;

[0186] S372: If yes, it is determined to be an unstable signal, and the statistical cycle is set to P times. In this embodiment, P=100. This is only an example. In actual applications, the statistical cycle number P can be set to other values.

[0187] S3721: Determine whether P standing wave ratio values ​​are counted;

[0188] If not, return to steps S33 - S36 to continue reading the feedback power Fb and the reflected power Re to calculate the standing wave ratio value.

[0189] S37211: If yes, determine whether there are Q standing wave ratio values ​​greater than the standing wave threshold; in this embodiment, Q=98, where the values ​​of P and Q satisfy 0≤PQ≤5.

[0190] If so, take the last standing wave ratio value greater than the standing wave threshold;

[0191] S40: Execute the standing wave ratio value update and processing flow;

[0192] If not, take the last standing wave ratio value that is less than the standing wave threshold;

[0193] S40: Execute the standing wave ratio value update and processing flow.

[0194] The rest of the power-on standing wave test process, manual standing wave test process, standing wave ratio value update and processing process are the same as those in the second embodiment.

[0195] The method in this embodiment adds a judgment mechanism for stable signals and unstable signals, as well as a method for calculating the standing wave ratio for stable signals and unstable signals, which can adapt to scenarios where signal fluctuations are very large, accurately calculate the standing wave ratio, and avoid false detection.

[0196] Embodiment 4

[0197] An embodiment of the present invention discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program enables a computer to execute the multi-band system standing wave ratio detection method described in the second or third embodiment.

[0198] Embodiment 5

[0199] An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to enable a computer to execute the multi-band system standing wave ratio detection method described in embodiment one or embodiment two.

[0200] The embodiments described above are only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without paying creative labor.

[0201] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or partly contributed to the prior art in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, a magnetic disk storage, a magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0202] Finally, it should be noted that the multi-band system standing wave ratio detection method and device disclosed in the embodiment of the present invention discloses only the preferred embodiments of the present invention, which are only used to illustrate the technical solution of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting standing wave ratio of a multi-band system, characterized in that: include: Enter the power-on standing wave ratio detection process to detect the link status and standing wave ratio status of each frequency band; Detect whether the manual standing wave detection process has been entered, including whether a certain frequency band signal has been selected by human intervention and the standing wave detection signal has been triggered; If yes, perform standing wave detection on the selected frequency band signal to quickly detect the link status and standing wave ratio status of the frequency band, and enter the automatic standing wave detection process after the detection is completed; If not, enter the automatic standing wave detection process; The automatic standing wave detection process includes performing real-time standing wave detection on signals of the entire frequency band or the selected frequency band by receiving an external input signal; Execute the VSWR value update and processing flow, and update the VSWR value and VSWR alarm status.

2. The method for detecting the standing wave ratio of a multi-band system according to claim 1, characterized in that: The power-on standing wave detection process is entered to detect the link status and standing wave ratio status of each frequency band, including: Generate a fixed signal Tx output to the link of each frequency band; Read the feedback power Fb of the signal in each frequency band; Determine whether the absolute difference between the feedback power Fb of the signal of each frequency band and the power of the fixed signal Tx is less than a first threshold value; If yes, set the link status of the corresponding frequency band to normal; If not, set the link status of the corresponding frequency band to abnormal.

3. The method for detecting the standing wave ratio of a multi-band system according to claim 2, characterized in that: The step of setting the link status of the corresponding frequency band to normal includes: Read the reflected power Re of the signal in each frequency band; Calculate the standing wave ratio of each frequency band signal according to the transmission power Re and feedback power Fb of each frequency band signal and display it on the graphical user interface; The step of setting the link status of the corresponding frequency band to abnormal includes: Shut down the power amplifier unit of the abnormal link of the system; The abnormal link amplifier fault alarm and VSWR status displayed in the graphical user interface cannot be detected.

4. The method for detecting the standing wave ratio of a multi-band system according to claim 3, characterized in that: The method of calculating the standing wave ratio of each frequency band signal according to the transmission power Re and the feedback power Fb of each frequency band signal and displaying it on the graphical user interface includes: Among the standing wave ratio values ​​of various frequency bands, a frequency band whose standing wave ratio value is less than a preset standing wave threshold is selected as a selected frequency band for the automatic standing wave detection process and displayed on a graphical user interface.

5. The method for detecting the standing wave ratio of a multi-band system according to claim 4, characterized in that: The standing wave detection is performed on the selected frequency band signal, and after the detection is completed, the automatic standing wave detection process is entered, which includes: Generate a fixed signal Tx output to the link of the selected frequency band; Read the feedback power Fb of the signal in the selected frequency band; Determine whether the absolute difference between the feedback power Fb of the signal of the frequency band and the power of the fixed signal Tx is less than a first threshold value; If yes, set the link status of the frequency band to normal; Read the reflected power Re of the selected frequency band signal; Calculate the standing wave ratio value of the selected frequency band signal according to the transmission power Re and feedback power Fb of the selected frequency band signal; Execute the VSWR value update and processing flow; Enter automatic standing wave detection; If not, set the link status of the selected frequency band to abnormal; Turn off the power amplifier units corresponding to all frequency band links; The graphical user interface displays the selected frequency band link amplifier fault alarm and the VSWR status cannot be detected.

6. The method for detecting the standing wave ratio of a multi-band system according to claim 5, characterized in that: The automatic standing wave detection process includes performing real-time standing wave detection on signals of the full frequency band or the selected frequency band, updating the standing wave ratio value and the standing wave ratio alarm status, including: Set the link of the full band or selected band to the mode of receiving external input signal; Set the standing wave ratio calculation period; Reading the feedback power Fb and the reflected power Re at a first time interval within the standing wave ratio calculation period; Take out the maximum feedback power maxFbPwr and the second largest feedback power subFbPwr in this cycle to calculate the average feedback power agvFbPwr; Take out the maximum reflected power maxRePwr and the second largest reflected power subRePwr in this cycle to calculate the average reflected power agvRePwr; The standing wave ratio value vswr1 is calculated by the maximum feedback power maxFbPwr and the maximum reflected power maxRePw; The standing wave ratio value vswr2 is calculated by the second largest feedback power subFbPwr and the second largest reflected power subRePwr; The standing wave ratio value vswr3 is calculated by the average feedback power agvFbPwr and the average reflected power agvRePwr; The minimum value of vswr1, vswr2 and vswr3 is taken as the latest calculated standing wave ratio value.

7. The method for detecting the standing wave ratio of a multi-band system according to claim 6, characterized in that: The step of reading the feedback power Fb and the reflected power Re at a first time interval within the standing wave ratio calculation period includes: Calculate the current output power, output power = feedback power Fb + output power bias + feedback attenuation; and compare whether the current output power is greater than the rated power minus the second threshold value; If yes, record the currently read feedback power Fb and reflected power Re; If not, the currently read feedback power Fb and reflected power Re are not recorded, and the feedback power Fb and reflected power Re at the next moment are read continuously.

8. The method for detecting the standing wave ratio of a multi-band system according to claim 7, characterized in that: The method of taking out the minimum value of vswr1, vswr2 and vswr3 as the latest calculated standing wave ratio value comprises: Determine whether the fluctuation range of the feedback power Fb within the standing wave ratio calculation period is greater than a third threshold value; If not, it is judged as a stable signal, the statistical cycle is set to 1, the VSWR value calculated this time is taken out, and the VSWR value update and processing flow is executed; If yes, it is judged as an unstable signal, and the statistical cycle is set to P times to determine whether P standing wave ratio values ​​are counted; If so, determine whether there are Q times the standing wave ratio value greater than the standing wave threshold, where: ; If so, take the last standing wave ratio value greater than the standing wave threshold, and execute the standing wave ratio value update and processing flow; If not, take the last standing wave ratio value that is less than the standing wave threshold, and execute the standing wave ratio value update and processing flow.

9. The method for detecting the standing wave ratio of a multi-band system according to claim 8, characterized in that: The execution of the standing wave ratio value update and processing process includes: Determine whether the difference between the standing wave ratio value of the current round of detection and the standing wave ratio value of the previous round of detection is greater than a fourth threshold value; If yes, the VSWR value of this round of detection is adopted and displayed on the graphical user interface; If not, the VSWR value of the previous round of detection is adopted and displayed on the graphical user interface; Determine whether the standing wave ratio value is greater than the standing wave threshold; If yes, shut down the power amplifier units of all frequency bands and report a standing wave alarm; If not, clear the standing wave alarm.

10. A multi-band system standing wave ratio detection device, characterized in that: It uses the multi-band system standing wave ratio detection method as described in any one of claims 1-9.

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