Device for automatically measuring and controlling shortwave radio frequency excitation flatness
By designing a device that automatically measures and controls the flatness of the short-wave RF excitation, the combination of PC and measuring instruments can be used to achieve automatic calibration and measurement, which solves the problem of difficult control of the flatness of the RF excitation signal, achieves efficient and precise control, and protects the equipment from damage.
Patent Information
- Application Number
- CN202421111142.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-05-21
AI Technical Summary
In short-wave communication systems, the flatness of the radio frequency excitation signal is difficult to effectively control, resulting in the change of signal amplitude exceeding the requirements. The prior art automatic measurement control method is complex and costly, and manual calibration is time-consuming and labor-intensive and error-prone.
A device that automatically measures and controls the flatness of short-wave RF excitation is designed. Through the combination of PC, measuring instrument, main control board and business board, automatic calibration and measurement are realized, and the surface is operated by mobile components and protective covers to prevent collision damage.
Unattended automatic calibration and measurement are realized, which reduces calculation complexity and system costs, improves the control accuracy of RF flatness, and avoids equipment damage.
Smart Images
Figure CN222884685U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of shortwave communication equipment, in particular to a device for automatically measuring and controlling the flatness of shortwave radio frequency excitation. Background Art
[0002] In the shortwave communication system, the receiving controller has two main functions: one is the receiving and processing function, that is, processing the received shortwave signal and extracting the voice or data information in the signal; the other is the control transmission function, that is, controlling the transmitter to transmit the information. For the control transmission function, one implementation method is that the receiving controller modulates the information to generate a modulated RF excitation signal, and then the transmitter performs subsequent amplification, filtering and transmission processing on the RF excitation signal.
[0003] Since the receiving controller and the transmitter belong to different systems, in order to facilitate connection and use, it is necessary to specify the characteristics of the RF excitation signal between the two systems. One of the important indicators is RF flatness, that is, the amplitude change of the signal under different frequencies and different environments must be kept within a certain range.
[0004] As for the generation of RF excitation signals, within the shortwave frequency band, they can be generated by high-speed DAC through RF digitization technology, and then directly output after being amplified to the specified amplitude by the RF amplifier. Due to the nonlinear characteristics of the DAC and amplifier and the influence of ambient temperature, the flatness of the final output RF excitation signal will exceed the index requirements.
[0005] In order to meet the requirements of RF flatness, the output amplitude needs to be controlled. One control method is closed-loop control, that is, real-time acquisition and calculation of the output amplitude, and then adjusting the output according to the calculation results. The other is open-loop control, which manually calibrates the signal response curve and then performs compensation control. For closed-loop control, it is necessary to add an acquisition and calculation device, which is complex in calculation and high in system cost. In addition, the control accuracy of small signals is limited by the acquisition accuracy, and the effect is poor. Signal jitter problems are also prone to occur. For open-loop control with manual calibration, it is time-consuming and labor-intensive, prone to errors, and insufficient in control accuracy.
[0006] When the measuring instrument is not in use, the exposed operating buttons and display are not protected from collision and may be damaged.
[0007] Therefore, it is necessary to provide a device for automatically measuring and controlling the flatness of shortwave radio frequency excitation to solve the above technical problems. Utility Model Content
[0008] The utility model provides a device for automatically measuring and controlling the flatness of short-wave radio frequency excitation, which solves the problem of damage caused by collision due to lack of protection of operating buttons and displays exposed on the surface when the measuring instrument is not in use.
[0009] In order to solve the above technical problems, the utility model provides a device for automatically measuring and controlling the flatness of shortwave radio frequency excitation, comprising:
[0010] A PC is connected to a measuring instrument and a main control board, the main control board is connected to a service board, and the measuring instrument is connected to the service board.
[0011] Preferably, the measuring instrument is used to check the measuring structure of the equipment.
[0012] Preferably, the measuring instrument is a spectrum analyzer or a power meter.
[0013] Preferably, the PC is used to control the output of a radio frequency signal of a specified frequency and amplitude.
[0014] Preferably, a movable component is arranged on the left and right sides of the surface of the measuring instrument, and the movable component includes a fixed plate, a movable groove is opened on the surface of the fixed plate, a movable block is slidably connected inside the movable groove, and one side of the movable block is rotatably connected to the movable plate through a rotating shaft.
[0015] Preferably, a fixing bolt is arranged inside the moving block, and a fixing hole matched with the fixing bolt is opened on the inner wall of the moving groove.
[0016] Preferably, a protective cover is rotatably connected between the two movable plates via a rotating shaft.
[0017] Compared with the related art, the device for automatically measuring and controlling the flatness of shortwave radio frequency excitation provided by the utility model has the following beneficial effects:
[0018] Providing movable components and protective covers on the left and right sides of the measuring instrument surface can protect the operating buttons and display exposed on the surface when the measuring instrument is not in use, thereby preventing damage caused by collision. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic structural diagram of a first embodiment of a device for automatically measuring and controlling shortwave radio frequency excitation flatness provided by the utility model;
[0020] Figure 2 A schematic diagram of the software implementation method;
[0021] Figure 3 is a schematic diagram of the automatic calibration process;
[0022] Figure 4 A schematic structural diagram of a second embodiment of a device for automatically measuring and controlling shortwave radio frequency excitation flatness provided by the utility model;
[0023] Figure 5 for Figure 4An enlarged schematic diagram of part B is shown.
[0024] Numbers in the figure: 1. PC, 2. Measuring instrument, 3. Business board, 4. Main control board, 5. Moving component, 51. Fixed board, 52. Moving slot, 53. Moving block, 54. Moving board, 55. Fixing bolt, 6. Protective cover. DETAILED DESCRIPTION
[0025] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.
[0026] First embodiment
[0027] Please refer to Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 A schematic structural diagram of a first embodiment of a device for automatically measuring and controlling shortwave radio frequency excitation flatness provided by the utility model; Figure 2 A schematic diagram of the software implementation method; Figure 3 A device for automatically measuring and controlling the flatness of shortwave radio frequency excitation includes:
[0028] A PC 1 is connected to a measuring instrument 2 and a main control board 4 , the main control board 4 is connected to a service board 3 , and the measuring instrument 2 is connected to the service board 3 .
[0029] The measuring instrument 2 is used to inspect the measuring structure of the device.
[0030] The measuring instrument 2 is a spectrum analyzer or a power meter.
[0031] The PC 1 is used to control the output of a radio frequency signal with a specified frequency and amplitude.
[0032] The implementation of the technical solution for shortwave communication equipment is further described in detail:
[0033] S1. Set the output target power of the shortwave communication equipment to 5dBm, the control error during calibration to 0.1dBm, set the starting frequency to 2MHz, the ending frequency to 30MHz, the frequency interval to 100kHz, and set the absorption power meter to measure the output power;
[0034] S2. Set the power control initial value to 10000 and the control coefficient to 1000. The radio uses this value to control the output amplitude of the RF excitation.
[0035] S3. After calibration begins, the software first controls the radio to output a RF signal with a specified frequency of 2MHz and a specified control amount of 10000, then reads the measurement result of the power meter, calculates a new control amount based on the power difference, and the radio outputs a signal according to the new control amount, and then measures again until the output power at the frequency point is within the range of 5dB±0.1dB, and automatically records the frequency, temperature and control amount at this time;
[0036] S4, the software controls the radio interface to output a frequency of 2.1MHz, repeats S3, records the frequency, temperature and control amount at this time, continues to modify the signal frequency until the end frequency, and obtains the frequency amplitude characteristic table;
[0037] S5. Control the ambient temperature of the equipment. Place the equipment in a constant temperature box and set the temperature to -20°C, 0°C, 20°C, 40°C, and 60°C respectively. Set the frequency interval to 1MHz. S3. Record the frequency, temperature, and control amount at this time. According to the temperature change, obtain the temperature characteristic table.
[0038] S6. Write the frequency-amplitude characteristic table and the temperature characteristic table into the corresponding shortwave communication device. When the device is to output a 15MHz RF signal, first search the frequency-amplitude characteristic table to obtain the control amount at this time, and then search the temperature characteristic table according to the current temperature to correct the control amount. Finally, use the control amount to output the RF signal.
[0039] like Figure 1 As shown, based on network communication, the VISA software architecture is adopted and the SCPI standard commands are used to implement the general computer software for automatic calibration and measurement.
[0040] according to Figure 2 As shown, a general computer, a main control board, a business board, and a measuring instrument (spectrum analyzer or power meter) are connected using a computer network.
[0041] according to Figure 3 The process shown controls the shortwave communication equipment to output a radio frequency signal of a specified frequency and amplitude. After the signal is stable, the measurement result of the spectrum analyzer or power meter is read. Then, the amplitude of the excitation signal output by the shortwave communication equipment is continuously adjusted according to the measured value to make the output power reach the target value. After the output signal is stable, the frequency, amplitude and temperature at this time are recorded.
[0042] Then control the shortwave communication equipment to output the signal of the next frequency to be tested, and repeat the above measurement process until all frequencies have been tested.
[0043] At this point, the frequency and amplitude characteristic table is measured in the entire shortwave frequency band. The same method can also be used to measure whether the RF excitation signal output by the shortwave communication equipment meets the requirements.
[0044] Place the shortwave communication equipment in a constant temperature box, set the corresponding ambient temperature, calibrate and measure the specified frequency again, and obtain the temperature amplitude curve.
[0045] The curves measured at different frequencies are averaged and fitted, the temperature variation characteristics are calculated, and a temperature characteristic table is generated.
[0046] The frequency amplitude characteristic table and the temperature characteristic table are written into the corresponding shortwave communication equipment. When entering the transmitting state under normal working conditions, the output RF amplitude corresponding to the current frequency is first calculated from the frequency amplitude characteristic table, and then the current ambient temperature is read through the temperature sensor. The RF amplitude value is corrected according to the temperature characteristic table, and finally the specified RF signal is output.
[0047] Compared with the related art, the device for automatically measuring and controlling the flatness of shortwave radio frequency excitation provided by the utility model has the following beneficial effects:
[0048] The utility model provides a device for automatically measuring and controlling the flatness of shortwave radio frequency excitation. The control method does not require a large number of calculation processes, and the purpose can be achieved only by a table lookup method. In addition, there is no need to add special detection devices in the equipment, thus saving calculation resources and equipment costs.
[0049] The automatic calibration method is adopted to realize unattended calibration measurement, which solves the time-consuming and labor-intensive problem of manual calibration. At the same time, frequency points can be added according to the characteristics of the equipment to further improve the control accuracy of the RF flatness without additional calculation and calibration work.
[0050] Second embodiment
[0051] Please refer to Figure 4 and Figure 5 Based on the device for automatically measuring and controlling the flatness of shortwave RF excitation provided by the first embodiment of the present application, the second embodiment of the present application proposes another device for automatically measuring and controlling the flatness of shortwave RF excitation. The second embodiment is only a preferred method of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.
[0052] Specifically, the difference of the device for automatically measuring and controlling the flatness of shortwave RF excitation provided by the second embodiment of the present application is that, in the device for automatically measuring and controlling the flatness of shortwave RF excitation, a movable component 5 is arranged on the left and right sides of the surface of the measuring instrument 2, and the movable component 5 includes a fixed plate 51, and a movable groove 52 is opened on the surface of the fixed plate 51, and a movable block 53 is slidably connected inside the movable groove 52, and one side of the movable block 53 is rotatably connected to a movable plate 54 through a rotating shaft.
[0053] The two fixing plates 51 are symmetrically connected to the left and right sides of the surface of the measuring instrument 2 . The use of the moving groove 52 and the moving block 53 facilitates the opening and closing of the protective cover 6 through the moving plate 54 .
[0054] A fixing bolt 55 is disposed inside the moving block 53 , and a fixing hole matched with the fixing bolt 55 is opened on the inner wall of the moving groove 52 .
[0055] A protective cover 6 is rotatably connected between the two movable plates 54 via a rotating shaft.
[0056] The working principle of the device for automatically measuring and controlling the flatness of shortwave radio frequency excitation provided by the utility model is as follows:
[0057] During use, when the measuring instrument 2 is not in use, the protective cover 6 is pushed to drive the movable plate 54 to move. When the movable plate 54 moves, it drives the movable block 53 to move inside the movable groove 52. When the protective cover 6 moves to the key protection on the surface of the measuring instrument 2, the fixing bolt 55 is used to pass through the movable block 53 and connect with the fixing hole on the inner wall of the movable groove 52.
[0058] Compared with the related art, the device for automatically measuring and controlling the flatness of shortwave radio frequency excitation provided by the utility model has the following beneficial effects:
[0059] The utility model provides a device for automatically measuring and controlling the flatness of short-wave radio frequency excitation. A moving component 5 and a protective cover 6 are arranged on the left and right sides of the surface of a measuring instrument 2 to protect the operating buttons and a display exposed on the surface when the measuring instrument 2 is not in use, so as to prevent damage caused by collision.
[0060] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A device for automatically measuring and controlling the flatness of shortwave radio frequency excitation, comprising: A PC, wherein the PC is connected to a measuring instrument and a main control board, the main control board is connected to a service board, the measuring instrument is connected to the service board, the measuring instrument is used to check the measurement structure of the equipment, the measuring instrument is a spectrum analyzer or an absorption power meter, and the PC is used to control the output of a radio frequency signal of a specified frequency and amplitude; It is characterized in that a movable component is arranged on the left and right sides of the surface of the measuring instrument, and the movable component includes a fixed plate, a movable groove is opened on the surface of the fixed plate, a movable block is slidably connected inside the movable groove, and one side of the movable block is rotatably connected to the movable plate through a rotating shaft.
2. The device for automatically measuring and controlling the flatness of shortwave radio frequency excitation according to claim 1, characterized in that: A fixing bolt is arranged inside the moving block, and a fixing hole matched with the fixing bolt is opened on the inner wall of the moving groove.
3. The device for automatically measuring and controlling the flatness of shortwave radio frequency excitation according to claim 2, characterized in that: A protective cover is rotatably connected between the two moving plates via a rotating shaft.