Short-wave broadcast antenna ATU input standing-wave ratio automatic adjusting and testing system

Abstract

The invention provides a broadcast antenna ATU input standing-wave ratio automatic adjusting and testing system. A human-computer interface is used for setting a target working program, a working frequency band and initial inductance and capacitance values, and a tuned standing-wave ratio curve and inductance and capacitance values are displayed; the control module decomposes the input initial inductance and capacitance values into rotation turns required by the current motor, transmits the rotation turns to the transmission module, and sends a target working program to the original short-wave antenna system; the transmission module enables the motor to be located at a target position, and correspondingly, target inductance and capacitance values are achieved; the data acquisition module is used for testing the standing-wave ratio of the system, reading the current inductance and capacitance values, recording the maximum value of the standing-wave ratio and sending the maximum value to the data processing module; and the data processing module processes the data and judges whether the current standing-wave ratio meets the requirement or not. According to the method, the automatic test system and the automatic optimization algorithm are combined, so that the workload of debugging personnel is reduced, and the working efficiency of ATU tuning is improved.

Description

Technical Field

[0001] The present invention relates to the field of shortwave broadcasting, and particularly to an automatic tuning system for the input standing wave ratio of a broadcast antenna ATU. Background Art

[0002] The broadband broadcast shortwave antenna system is tuned by adjusting the inductance L and capacitance C in the matching network of the automatic tuning unit (ATU) to achieve impedance matching of the antenna within a specific program and specific frequency band. LC tuning is narrowband tuning. For a broadband broadcast antenna, a set of L and C values cannot achieve broadband impedance matching, and the antenna bandwidth needs to be divided into several narrow frequency bands for tuning. For different antenna programs, the antenna impedance is different, and tuning needs to be carried out separately according to different programs. Therefore, for any narrow frequency band and any antenna program, there is a corresponding set of L and C values to achieve impedance matching. The tuning task is huge.

[0003] Currently, when optimizing the input standing wave ratio of the ATU in the shortwave broadcast system, manual debugging is generally adopted, and the inductance L and capacitance value C are adjusted one by one for each antenna program and each narrow frequency band. Due to the large number of working programs and working frequency bands of the shortwave antenna, the workload of manual optimization is extremely large, wasting time and manpower. There is an urgent need for an automatic tuning system to liberate manpower and improve work efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to improve the working efficiency of ATU tuning.

[0005] The present invention solves the above technical problem by the following technical means: An automatic tuning system for the input standing wave ratio of a broadcast antenna ATU, comprising a human-machine interface, a control module, a transmission module, a data acquisition module, and a data processing module;

[0006] The human-machine interface is used to set the target working program, working frequency band, and initial inductance and capacitance values, and display the standing wave ratio curve and inductance and capacitance values after tuning;

[0007] The control module is used to send instructions to the other modules, decompose the input initial inductance and capacitance values into the number of turns required for the current motor to rotate, and transmit them to the transmission module, and send the target working program to the original shortwave antenna system to make the working state of the original shortwave antenna system in the target working program;

[0008] The transmission module includes a motor, an inductor, and a capacitor. According to the number of turns required for the current motor to rotate transmitted by the control module, the motor is rotated to make the motor in the target position, and correspondingly, the target inductance and capacitance values are achieved;

[0009] The data acquisition module includes a vector network analyzer and related signal lines, which are used to test the standing wave ratio of the system, read the current inductance and capacitance values, record the maximum value of the standing wave ratio of this group, and send the maximum value of the standing wave ratio of this group, the inductance value, and the capacitance value to the data processing module;

[0010] The data processing module is used to process the collected data. Combining the collected standing wave ratio, it judges whether the current standing wave ratio meets the requirements. If it meets the requirements, the optimization is stopped, and the current standing wave ratio, inductance, and capacitance values are sent to the human-machine interface; if the maximum value of the standing wave ratio does not meet the requirements, an automatic optimization algorithm is used to perform the next round of optimization of the standing wave ratio objective function. Through calculation, a new set of inductance and capacitance values is generated and sent to the control module to start the next round of loop.

[0011] As an optimized technical solution, the target working program can select a certain program, several programs, or all programs; the target working frequency band can select a certain section, several sections, or all frequency bands; the selected working frequency band and working program are determined by the working program and working frequency band required for the short-wave antenna to work.

[0012] As an optimized technical solution, the human-machine interface sets the target working program, working frequency band, and initial inductance and capacitance values, which can be input manually or selected from the given options.

[0013] As an optimized technical solution, the corresponding relationship between the number of turns of the motor rotation and the inductance and capacitance values is obtained by reading a table, and the number of turns - inductance value and number of turns - capacitance value in the table have been stored in the system in advance.

[0014] As an optimized technical solution, the following steps are used to test the input standing wave ratio of the broadcast antenna ATU:

[0015] Step 1, according to the working requirements of the broadcast antenna, the user determines the working frequency band, antenna program, and initial L and C values from the human-machine interface and sends them to the control module;

[0016] Step 2, the control module decomposes the input inductance L and capacitance C values into the number of turns required for the current motor to rotate and sends them to the transmission module to drive the corresponding motor to rotate to the corresponding position; the target working program is sent to the original short-wave antenna system to make the working state of the original short-wave antenna system in the target working program;

[0017] Step 3, after the motor rotations are all ready, the vector network analyzer in the data acquisition module automatically tests and reads the standing wave ratio at the input end of the ATU and sends the standing wave ratio test data to the data processing module;

[0018] Step 4: After the data processing module obtains the current standing wave ratio test data, it compares the maximum value of the standing wave ratio with the target value. If the requirement is met, the optimization is stopped, and the current standing wave ratio, inductance, and capacitance values are sent to the human-machine interface. If the maximum value of the standing wave ratio does not meet the requirement, an automatic optimization algorithm is used to perform the next round of optimization of the standing wave ratio objective function. Through calculation, a new set of inductance and capacitance values is generated and sent to the control module to start the next round of loop.

[0019] As an optimized technical solution, in the said step 1, the initial L = Lmax / 2 and C = Cmax / 2, where Lmax refers to the maximum inductance value that the short-wave antenna system can achieve, and Cmax refers to the maximum capacitance value that the short-wave antenna system can achieve.

[0020] As an optimized technical solution, in the said step 4, the automatic optimization algorithm is to determine the values of L and C by adopting an optimization algorithm.

[0021] As an optimized technical solution, the said step 4 includes:

[0022] First, establish an optimization function:

[0023] VSWR0 = F(fq, L, C)

[0024] In the formula, the frequency fq is the independent variable, VSWR is the dependent variable, L and C are undetermined parameters, and F is a non-linear function of the undetermined parameters. The parameter estimation of this equation is to determine the values of L and C from the standing wave ratio VSWR sequence measured by the vector network analyzer. The automatic optimization problem is expressed as:

[0025] miny = max(F(fq, L, C)) - VSWR0

[0026] st. (L, C) ∈ D

[0027] In the formula, y is the optimization criterion function, and D is the variation range of the undetermined parameters. The genetic algorithm can be used to optimize the above optimization problem, and the inductance value L and capacitance value C that meet the conditions are determined through optimization.

[0028] As an optimized technical solution, the said steps 1-4 are a set of automatic debugging steps for a program and a certain frequency band. The frequency band that can be automatically adjusted for the input standing wave ratio of the broadcast antenna ATU can be freely selected, and a certain section, several sections, or all frequency bands can be selected.

[0029] As an optimized technical solution, the input standing wave ratio automatic measurement method of the broadcast antenna ATU can freely select the optimization mode, and can select a certain mode, several modes, or all modes; it can freely combine the optimized frequency and mode, and can also select all of them.

[0030] The advantages of the present invention are as follows: By using a method that combines an automatic test system and an automatic optimization algorithm, with the input standing wave ratio of the ATU as the optimization target, the best capacitance and inductance values are obtained by controlling the standing wave ratio data of the read-write vector network analyzer and combining the automatic optimization algorithm. This reduces the workload of the debugging personnel and improves the working efficiency of ATU tuning. Description of the Drawings

[0031] Figure 1 It is the working flowchart of the automatic measurement and adjustment system for the input standing wave ratio of the ATU in the embodiment of the present invention. Detailed Embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] As Figure 1 shown, an automatic measurement and adjustment system for the input standing wave ratio of a short-wave broadcast antenna ATU provided by the present invention is built on the basis of an existing short-wave antenna system. The automatic measurement and adjustment system for the input standing wave ratio of the short-wave broadcast antenna ATU includes a human-machine interface, a control module, a transmission module, a data acquisition module, and a data processing module.

[0034] Among them, the human-machine interface is used to input or select the target working program, working frequency band, and initial inductance and capacitance values, and display the standing wave ratio curve and inductance and capacitance values after tuning. The tunable working frequency band can select a certain section, several sections, or all frequency bands; the tunable working program can select a certain program, several programs, or all programs; the selected working frequency band and working program are determined by the working program and working frequency band required for the short-wave antenna to work.

[0035] The control module is used to send instructions to the other modules. Decompose the input inductance and capacitance values into the number of turns required for the current motor to rotate, and transmit them to the transmission module. Send the target working program to the original short-wave antenna system to make the working state of the original short-wave antenna system in the target working program.

[0036] The transmission module includes a motor, an inductor, and a capacitor. According to the number of turns required for the current motor to rotate transmitted by the control module, rotate the motor to make the motor in the target position. Correspondingly, the target inductance and capacitance values are realized. The target values in the first round are the initially input inductance and capacitance values, and a new set of inductance and capacitance values will be generated as the target inductance and capacitance values after each round of the process.

[0037] The data acquisition module includes a vector network analyzer and related signal lines, which are used to test the standing wave ratio of the system, read the current inductance and capacitance values, record the maximum value of the standing wave ratio of this group, and send the maximum value of the standing wave ratio of this group, the inductance value, and the capacitance value to the data processing module.

[0038] The data processing module is used to process the collected data. Combining the collected standing wave ratio, it judges whether the current standing wave ratio meets the requirements. If it meets the requirements, the optimization is stopped, and the current standing wave ratio, inductance, and capacitance values are sent to the human-machine interface; if the maximum value of the standing wave ratio does not meet the requirements, an automatic optimization algorithm is used to perform the next round of optimization of the standing wave ratio objective function. Through calculation, a new set of inductance and capacitance values is generated and sent to the control module to start the next round of loop.

[0039] The working process of the automatic tuning and testing system for the input standing wave ratio of the short-wave broadcast antenna ATU is as follows:

[0040] Step 1, according to the working requirements of the broadcast antenna, the user determines the working frequency band, antenna type, and initial L and C values from the human-machine interface and sends them to the control module. The tuning needs to be carried out in frequency bands, and the working state is related to the frequency band. Therefore, the working frequency band needs to be determined first;

[0041] Furthermore, when determining the working frequency band, antenna type, and initial L and C values, they can be manually input or selected from the given options.

[0042] Furthermore, initially, L = Lmax / 2 and C = Cmax / 2. Where Lmax refers to the maximum inductance value that can be achieved by the short-wave antenna system, and Cmax refers to the maximum capacitance value that can be achieved by the short-wave antenna system.

[0043] Step 2, the control module decomposes the input inductance L and capacitance C values into the number of turns required for the current motor to rotate and sends them to the transmission module to drive the corresponding motor to rotate to the corresponding position; it sends the target working type to the original short-wave antenna system to make the working state of the original short-wave antenna system in the target working type.

[0044] Furthermore, the corresponding relationship between the number of turns of the motor and the inductance and capacitance values is obtained by reading a table. The number-of-turns - inductance value and number-of-turns - capacitance value in the table have been stored in the system in advance.

[0045] Step 3, after the motors are all ready to rotate, the vector network analyzer in the data acquisition module automatically tests and reads the standing wave ratio at the input end of the ATU and sends the standing wave ratio test data to the data processing module;

[0046] Step 4, after the data processing module obtains the current standing wave ratio test data, it compares the maximum value of the standing wave ratio with the target value. If the requirement is met, the optimization is stopped, and the current standing wave ratio, inductance, and capacitance values are sent to the human-machine interface; if the maximum value of the standing wave ratio does not meet the requirement, an automatic optimization algorithm is used to perform the next round of optimization of the standing wave ratio objective function. Through calculation, a new set of inductance and capacitance values is generated and sent to the control module to start the next round of loop.

[0047] Further, the automatic optimization algorithm determines the values of L and C by using an optimization algorithm. First, an optimization function is established:

[0048] VSWR0 = F(fq, L, C)

[0049] In the formula, the frequency fq is the independent variable, VSWR is the dependent variable, L and C are undetermined parameters, and F is a non-linear function of the undetermined parameters. The parameter estimation of this equation is to determine the values of L and C from the VSWR sequence measured by the vector network analyzer. The automatic optimization problem is expressed as:

[0050] miny = max(F(fq, L, C)) - VSWR0

[0051] st. (L, C) ∈ D

[0052] In the formula, y is the optimization criterion function, and D is the change range of the undetermined parameters. The genetic algorithm can be used to optimize the above optimization problem, and the inductance value L and capacitance value C that meet the conditions are determined through optimization.

[0053] Further, Steps 1-4 are the optimization steps for a set of programs and a certain frequency band. The frequency band for one-time optimization of the automatic debugging method of the present invention can be freely selected, and a certain segment, several segments, or all frequency bands can be selected; the optimization mode can be freely selected, and a certain mode, several modes, or all modes can be selected; the frequency and mode of optimization can be freely combined, or all can be selected.

[0054] Taking the optimal standing wave ratios in the 5MHz - 5.01MHz and 5.01MHz - 5.02MHz frequency bands when tuning two programs of HR2 / 2 / 0.5 and HR4 / 4 / 0.5, and storing the corresponding L, C, and standing wave ratio values as an example, the working steps of the above short-wave broadcast antenna ATU input standing wave ratio automatic debugging system are as follows:

[0055] Step 1, on the human-machine interface, select the programs of HR2 / 2 / 0.5 and HR4 / 4 / 0.5, and the frequency bands of 5MHz - 5.01MHz and 5.01MHz - 5.02MHz; input the initial L and C values, where L = 5μH and C = 8pF;

[0056] Step 2, the system first optimizes the operating states of HR2 / 2 / 0.5 and 5 MHz - 5.01 MHz. The control module sends the HR2 / 2 / 0.5 program command to the original short-wave antenna system to make the operating state of the original short-wave antenna system in the target operating program. The control module determines the number of turns the motor needs to rotate to achieve L = 5 μH and C = 8 pF by looking up a table, and sends an instruction to the drive module.

[0057] Step 3, the drive module drives the corresponding servo motor to rotate the corresponding number of turns to achieve L = 5 μH and C = 8 pF;

[0058] Step 4, in the data acquisition module, the vector network analyzer is connected to the input end of the ATU to measure the standing wave ratio, and sends the measured standing wave ratio data to the data processing module.

[0059] Step 5, in the data processing module, it is judged whether the sent standing wave ratio meets the requirements. If it meets the requirements, the optimization is stopped, and the current standing wave ratio, inductance, and capacitance values are sent to the human-machine interface; if the maximum value of the standing wave ratio does not meet the requirements, the automatic optimization algorithm is used to perform the next round of optimization of the standing wave ratio objective function. Through calculation, a new set of inductance and capacitance values is generated, which is sent to the control module, and then to Step 1 to start the next round of loop until there is an optimal value, and the optimal standing wave ratio curve is visualized, and then the capacitance and inductance values corresponding to the optimal value of the ATU input standing wave ratio in the HR2 / 2 / 0.5 and 5 MHz - 5.01 MHz modes are stored.

[0060] Loop Steps 2 - 4. When a loop is completed, the operating mode is changed at Step 2 in the next round of loop to traverse all program and frequency combinations.

[0061] Finally, four sets of capacitance and inductance values corresponding to the optimal value of the ATU input standing wave ratio in the HR2 / 2 / 0.5 and HR4 / 4 / 0.5 programs in the 5 MHz - 5.01 MHz and 5.01 MHz - 5.02 MHz frequency bands are obtained.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A broadcast antenna ATU input standing wave ratio automatic adjustment system, characterized in that: Including human-machine interface, control module, transmission module, data acquisition module, and data processing module; The human-machine interface is used to set the target working program, working frequency band, initial inductance and capacitance values, and display the standing wave ratio curve and inductance and capacitance values ​​after tuning; The control module is used to send instructions to the other modules, decompose the input initial inductance and capacitance values ​​into the number of rotations required by the current motor, and transmit them to the transmission module, and send the target working program to the original shortwave antenna system, so that the working state of the original shortwave antenna system is in the target working program; The transmission module includes a motor, an inductor and a capacitor, and rotates the motor according to the number of revolutions required by the current motor transmitted by the control module, so that the motor is located at the target position, and accordingly, the target inductor and capacitor values ​​are achieved; The data acquisition module includes a vector network analyzer and related signal lines, which are used to test the system standing wave ratio and read the current inductance and capacitance values, record the maximum standing wave ratio of this group, and send the maximum standing wave ratio, inductance value and capacitance value of this group to the data processing module; The data processing module is used to process the collected data, and judge whether the current standing wave ratio meets the requirements in combination with the collected standing wave ratio. If the requirements are met, the optimization is stopped, and the current standing wave ratio, inductance, and capacitance values ​​are sent to the human-machine interface; if the maximum standing wave ratio value does not meet the requirements, the automatic optimization algorithm is used to perform the next round of optimization of the standing wave ratio objective function, and a newly generated set of inductance and capacitance values ​​are sent to the control module through calculation to start the next round of circulation.

2. The broadcast antenna ATU input standing wave ratio automatic adjustment system according to claim 1, characterized in that: The target working program can select one, several or all programs; the target working frequency band can select one, several or all frequency bands; the selected working frequency band and working program are determined by the working program and working frequency band required for the shortwave antenna to work.

3. The broadcast antenna ATU input standing wave ratio automatic adjustment system according to claim 1, characterized in that: The target working program, working frequency band and initial inductance and capacitance values ​​are set on the human-machine interface and can be input manually or selected from given options.

4. The broadcast antenna ATU input standing wave ratio automatic adjustment system as claimed in claim 3, characterized in that: The correspondence between the number of motor revolutions and the inductance and capacitance values ​​is obtained by reading a table. The number of revolutions-inductance value and number of revolutions-capacitance value in the table have been stored in the system in advance.

5. The broadcast antenna ATU input standing wave ratio automatic adjustment system according to any one of claims 1 to 4, characterized in that: Use the following steps to debug: Step 1: According to the working requirements of the broadcast antenna, the user determines the working frequency band and antenna mode as well as the initial L and C values ​​from the human-machine interface and sends them to the control module; Step 2, the control module decomposes the input inductance L and capacitance C values ​​into the number of revolutions required by the current motor and sends them to the transmission module, driving the corresponding motor to the corresponding position; sends the target working program to the original shortwave antenna system, so that the working state of the original shortwave antenna system is in the target working program; Step 3, after the motors are ready to rotate, the vector network analyzer in the data acquisition module automatically tests and reads the standing wave ratio of the ATU input terminal, and sends the standing wave ratio test data to the data processing module; Step 4, after data processing module obtains current standing wave ratio test data, standing wave ratio maximum value and target value are compared, if it meets the requirements, then stop optimization, send current standing wave ratio, inductance, capacitance value to man-machine interface; If standing wave ratio maximum value does not meet the requirements, use automatic optimization algorithm to carry out next round of optimization of standing wave ratio target function, by calculation, produce a group of new inductance, capacitance value, send it to control module, start next round of circulation.

6. The broadcast antenna ATU input standing wave ratio automatic adjustment system as claimed in claim 5, characterized in that: In the step 1, initially L=Lmax / 2, C=Cmax / 2, wherein Lmax refers to the maximum inductance value that can be achieved by the shortwave antenna system, and Cmax / 2 refers to the maximum capacitance value that can be achieved by the shortwave antenna system.

7. The broadcast antenna ATU input standing wave ratio automatic adjustment system as claimed in claim 5, characterized in that: In step 4, the automatic optimization algorithm determines the values ​​of L and C by using an optimization algorithm.

8. The broadcast antenna ATU input standing wave ratio automatic adjustment system as claimed in claim 7, characterized in that: The step 4 comprises: First, create the optimization function: VSWR0=F(fq,L,C) In the formula, frequency fq is the independent variable, VSWR is the dependent variable, L and C are unknown parameters, and F is the nonlinear function of unknown parameters. The parameter estimation of this equation is to determine the values ​​of L and C by the standing wave ratio VSWR sequence tested by the vector network. The automatic optimization problem is expressed as: min y=max(F(fq,L,C))-VSWR0 st.(L,C)∈D In the formula, y is the optimization criterion function, and D is the variation domain of the unknown parameters. The above optimization problem can be optimized by genetic algorithm, and the inductance value L and capacitance value C that meet the conditions can be determined by optimization.

9. The broadcast antenna ATU input standing wave ratio automatic adjustment system as claimed in claim 5, characterized in that: The steps 1-4 are a set of program and automatic debugging steps for a frequency range. The frequency band optimized by the broadcast antenna ATU input standing wave ratio automatic adjustment method can be freely selected at one time, and a certain frequency range, several frequency ranges or all frequency ranges can be selected.

10. The broadcast antenna ATU input standing wave ratio automatic adjustment system according to claim 9, characterized in that: The broadcast antenna ATU input standing wave ratio automatic adjustment method can freely select the optimized mode, and can select a certain mode, several modes or all modes; can freely combine the optimized frequencies and modes, and can also select all of them.

Images