Software instrument system-based short-wave broadcast equipment power automatic calibration system

Abstract

The invention relates to the technical field of electronic measurement, and discloses a software instrument system-based short-wave broadcast equipment power automatic calibration system, which comprises a main control unit, a signal excitation unit and a measurement feedback unit. According to the method, an iterative adjustment process is controlled through a main control unit; a measurement feedback unit measures the actual output power of a measured device; and the main control unit directly takes the power difference value as the adjustment amount of the excitation level according to the power difference value between the actual output power and the preset target power, adds the adjustment amount with the current excitation level to obtain the next excitation level, and controls the output of the signal excitation unit until the preset precision is met. According to the method, test link loss calibration is executed before iterative adjustment so as to compensate system errors, a calibration lookup table can be automatically generated after calibration is completed, the problems that a traditional calibration method is low in efficiency and insufficient in precision are solved through an adaptive adjustment strategy and system error compensation, and the calibration accuracy is improved. The method has the beneficial effects of high convergence speed, accurate calibration result and high automation degree.

Description

Technical Field

[0001] This invention relates to the field of electronic measurement technology, specifically to an automatic power calibration system for shortwave broadcasting equipment based on a software instrument system. Background Technology

[0002] As an important radio communication tool, the accuracy of the output power of shortwave broadcasting equipment is a key indicator for ensuring communication quality and meeting regulatory requirements. Therefore, before the equipment leaves the factory or during regular maintenance, it is necessary to accurately calibrate the output of different power levels throughout the entire operating frequency band and generate calibration data for use by the internal firmware of the equipment.

[0003] In existing technologies, such power calibration tasks typically rely on manual or semi-automatic methods. Operators need to manually set up a test system using a series of independent test instruments, such as signal generators, power meters, and spectrum analyzers. The calibration process often requires operators to repeatedly and manually adjust the output of the signal generator at each frequency point and power level, while observing the power meter readings, approximating the target power value through multiple attempts, and then manually recording the final set value.

[0004] However, this traditional calibration method has inherent drawbacks. The process heavily relies on operator experience, making it time-consuming, labor-intensive, and inefficient. Furthermore, human error is easily introduced during reading and data recording, leading to poor consistency in calibration results between different batches and different operators. More importantly, insertion loss from passive components such as RF cables, connectors, and directional couplers is inherent in the RF test link, and this loss varies with frequency. During manual calibration, these link losses are often difficult to compensate for precisely and point-by-point, resulting in systematic deviations in measurement results and directly affecting the accuracy of the final calibration data. Therefore, how to achieve efficient, reliable, and accurate automated calibration of shortwave broadcast equipment power is a pressing technical problem in this field. Therefore, this invention provides an automatic power calibration system for shortwave broadcast equipment based on a software instrument system to address the shortcomings of existing technologies. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automatic power calibration system for shortwave broadcasting equipment based on a software instrument system, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatic power calibration system for shortwave broadcasting equipment based on a software instrument system, comprising: a main control unit, an interface adaptation unit, a signal excitation unit, and a measurement feedback unit. Each unit is connected to a radio frequency link via a preset communication link, forming a closed-loop control system. Specifically, the signal excitation unit generates an excitation signal and provides it to the device under test; the measurement feedback unit measures the output power of the device under test, obtains the actual output power, and feeds it back to the main control unit.

[0007] The main control unit is configured to continuously receive the actual output power fed back by the measurement feedback unit during the iterative adjustment cycle, compare it with the preset target power, and obtain the power difference between the two. Unlike traditional fixed-step or complex PID control, the main control unit directly calculates the next excitation level of the signal excitation unit based on this power difference and controls its output. The principle of this adjustment method is that the logarithmic deviation of the output power is directly used as the adjustment amount of the input excitation. This allows the system to rapidly approximate the target power when the actual power differs significantly from the target power; and when the two are close, the adjustment amount automatically decreases, thereby achieving fine-tuning and significantly improving the convergence speed and stability of the calibration process. This iterative adjustment process continues until the absolute value of the power difference meets the preset accuracy requirements.

[0008] To eliminate inherent system errors introduced by passive components such as RF cables and connectors, the main control unit is configured to perform a preprocessing step of test link loss calibration before executing iterative adjustments. Through a single full-band scan, the link loss values ​​corresponding to each frequency point in the test link are accurately measured and stored. During subsequent iterative adjustments, the main control unit uses these stored link loss values ​​to compensate the raw power data measured by the measurement feedback unit in real time. This ensures that the actual output power used to calculate the power difference is a corrected and accurate value, providing a fundamental guarantee for the final accuracy of the entire closed-loop adjustment.

[0009] The main control unit is also configured to record the final excitation level at each calibration point when it successfully converges, and automatically generate a structured calibration lookup table from this data after all calibration tasks are completed. This lookup table can be directly applied to the device under test, enabling precise control and display of its output power.

[0010] An automatic power calibration method for shortwave broadcasting equipment based on a software instrument system includes: a control signal excitation unit generating an excitation signal and providing it to the device under test; measuring the output power of the device under test through a measurement feedback unit to obtain the actual output power; calculating the next excitation level of the signal excitation unit based on the power difference between the actual output power and a preset target power; controlling the signal excitation unit to output the next excitation level, and repeating the aforementioned measurement, calculation, and control steps until the absolute value of the power difference is less than or equal to a preset accuracy threshold.

[0011] The method for calculating the next excitation level involves directly using the power difference as the adjustment amount for the excitation level, and superimposing it with the current excitation level to obtain the next excitation level. This adaptive adjustment strategy dynamically correlates the adjustment step size with the error magnitude, balancing the speed and accuracy of the calibration process.

[0012] Before performing iterative adjustment, a test link loss calibration step is also included, which measures and stores the loss of the test link. During the iterative adjustment process, the measured actual output power is first compensated based on the stored loss, and then the power difference is calculated using the compensated power value, thereby eliminating the influence of system error on the calibration result.

[0013] After all calibration points are completed, a calibration lookup table is generated based on the recorded valid data to enable the final application of the calibration results.

[0014] This invention provides an automatic power calibration system for shortwave broadcasting equipment based on a software instrument system. It has the following advantages: 1. This invention achieves this through its built-in test link loss calibration function. Before executing the core closed-loop adjustment, the system performs full-band loss measurement and generates compensation data for the entire test link from the output of the signal excitation unit to the input of the measurement feedback unit. In the subsequent calibration process, the system uses this compensation data to correct the original measurement value in real time, thereby eliminating the systematic errors introduced by passive components such as RF cables and connectors. This ensures that the power value based on the closed-loop control is the actual output power of the device, fundamentally guaranteeing the accuracy of the final calibration result and improving the accuracy of the calibration result.

[0015] 2. This invention employs a strategy of directly using the logarithmic difference between the actual output power and the target power as the adjustment amount for the next excitation level. This allows for a larger adjustment step when the power deviation is large, enabling rapid approximation; and an automatic reduction in the adjustment step when the power deviation decreases, facilitating precise fine-tuning. This effectively avoids the slow convergence or overshoot oscillation problems caused by traditional fixed-step adjustment methods, significantly improving the efficiency and stability of the calibration process, and enhancing the convergence speed and stability of power calibration.

[0016] 3. This invention integrates all steps, including device self-testing, link calibration, closed-loop power adjustment through multi-point traversal, and the generation of the final calibration lookup table, into a continuous and automatic execution process through unified software scheduling of the main control unit. The operator only needs to configure the initial parameters, and the entire complex calibration task can be completed automatically, which greatly reduces manual operation, avoids random errors introduced by manual reading, calculation and intervention, ensures high consistency and reliability of calibration results, realizes a high degree of automation of the entire calibration process, reduces manual intervention and improves reliability. Attached Figure Description

[0017] Figure 1 This is a system architecture diagram of the present invention; Figure 2 This is a flowchart of the automatic calibration method of the present invention; Figure 3 This is a sub-flowchart of the test link loss calibration of the present invention; Figure 4 This is a sub-flowchart of the optimized successive approximation algorithm of the present invention.

[0018] The components are as follows: 10. Main control unit; 20. Interface adapter unit; 30. Signal excitation unit; 40. Device under test; 50. Measurement feedback unit; 51. Power measurement module; 52. Spectrum analysis module; 60. Signal processing and transmission unit; 61. Directional coupler; 62. RF load. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1 - Appendix Figure 4 This invention provides an automatic power calibration system for shortwave broadcasting equipment based on a software instrument system, comprising: a main control unit 10, an interface adapter unit 20, a signal excitation unit 30, a device under test 40, a measurement feedback unit 50, and a signal processing and transmission unit 60.

[0021] The main control unit 10, as the control core of the system, can be a personal computer, an industrial control computer, or an embedded system with equivalent computing and control capabilities. The main control unit 10 is equipped with a processor, memory, and human-machine interface. A preset automatic calibration application program runs on it. The main control unit 10 is used to uniformly schedule and control the collaborative work of other units in the system, execute calibration algorithms, and is responsible for the acquisition, processing, storage, and display of test data.

[0022] The interface adapter unit 20 is electrically connected between the main control unit 10 and other units in the system that need to communicate. One end of the interface adapter unit 20 is connected to the main control unit 10 through a universal serial bus (USB) or a similar standard interface, while the other end integrates the physical layer and protocol layer conversion functions of various industrial communication buses, such as RS485, RS232 or TCP / IP network interfaces. The interface adapter unit 20 converts the control commands from the main control unit 10 into signal formats that can be recognized by each instrument unit, and at the same time converts the data fed back by each instrument unit into data formats that the main control unit 10 can process, thus realizing unified management and data interaction of heterogeneous communication interfaces.

[0023] The signal excitation unit 30 is a programmable radio frequency signal generator. Its radio frequency signal output terminal is connected to the signal input terminal of the device under test 40, and its communication control interface is connected to the interface adapter unit 20. The signal excitation unit 30 is used to generate a radio frequency excitation signal with precise controllable frequency and output level according to the instructions issued by the main control unit 10 through the interface adapter unit 20. Its operating frequency range covers the shortwave broadcast frequency band, and the output level has a sufficiently large dynamic adjustment range and a sufficiently high setting resolution to meet the needs of the calibration process.

[0024] The device under test 40, i.e. the shortwave broadcasting equipment that needs to be calibrated, receives the excitation signal from the signal excitation unit 30 at its signal input terminal and is connected to the signal processing and transmission unit 60 at its radio frequency power output terminal.

[0025] The measurement feedback unit 50 is used to accurately measure the output signal characteristics of the device under test 40 and feed the measurement results back to the main control unit 10 to form a closed-loop control. The measurement feedback unit 50 includes a power measurement module 51 and a spectrum analysis module 52.

[0026] The power measurement module 51 is a digital power meter. Its radio frequency signal input terminal is connected to the signal sampling output terminal of the signal processing and transmission unit 60, and its communication control interface is connected to the interface adapter unit 20. The power measurement module 51 is used to measure the output power value of the device under test 40 after sampling by the signal processing and transmission unit 60 in real time, and feed the power data back to the main control unit 10.

[0027] The spectrum analysis module 52 is a network spectrum analyzer, and its connection method is similar to that of the power measurement module 51. It is used to assist in monitoring the spectrum purity, harmonics and spurious signals of the output signal of the device under test 40 during the calibration process to ensure the effectiveness of the calibration process.

[0028] The signal processing and transmission unit 60 is connected in series between the output terminal of the device under test 40 and the RF load, and is used to safely and accurately process and transmit the high-power RF signal output by the device under test 40. Specifically, the signal processing and transmission unit 60 includes a directional coupler 61 and an RF load 62.

[0029] The directional coupler 61 is a four-port passive RF device. Its input port is connected to the output of the device under test 40, its main output port is connected to the RF load 62, and its coupling port is connected to the measurement feedback unit 50. The function of this directional coupler 61 is to distribute the high-power signal transmitted through the main path according to a known, fixed coupling ratio, and couple out a low-power signal to the measurement feedback unit 50 for measurement. The relationship between the main path power and the coupling port power is shown in the following formula: P cpl =P main -C; Among them, P main The signal power transmitted in the main path of directional coupler 61 is expressed in dBm. P cpl This represents the signal power output from the coupling port, in dBm. C is the coupling degree of the directional coupler 61, which is a known constant in dB.

[0030] The RF load 62 is connected to the main output port of the directional coupler 61. It has a characteristic impedance (e.g., 50 ohms) that matches the system and a sufficiently large power capacity. The RF load 62 is used to absorb most of the output power from the device under test 40, prevent RF energy reflection from damaging the device under test 40, and provide a stable working load environment for the system.

[0031] This invention also provides an automatic power calibration method for shortwave broadcasting equipment, comprising the following steps: S100 performs system initialization and self-calibration, including the following steps: S110, parameter configuration and task establishment are performed. The operator sets the execution parameters for this automatic calibration task through the human-machine interface deployed on the main control unit 10. These parameters include at least: the start and end frequencies of calibration, the step interval of frequency scanning, one or more target power levels to be calibrated, and the load type information of the device under test 40. After receiving these input parameters, the automatic calibration application in the main control unit 10 parses them and generates a structured task queue. The task queue stores all combinations of frequency points and power levels to be calibrated in the form of a data structure, which serves as the basis for the execution of subsequent automated processes. S120, Perform a system self-test to confirm that the hardware and communication links of the entire calibration system are in normal working order. This can be divided into the following sub-steps: S121, perform hardware module self-test. The main control unit 10, through the interface adapter unit 20, sequentially sends the identity query command and internal self-diagnosis command supported by its standard communication protocol to all instrument units connected through the communication bus, such as the signal excitation unit 30, the power measurement module 51, and the spectrum analysis module 52. The main control unit 10 polls and receives the response information of each unit. If the expected device model, serial number, and other identity information are successfully received, and the self-diagnosis response code is error-free, it is determined that the hardware module is functioning normally and the communication link is unobstructed. If any unit does not respond or returns an error code, the system stops the process and prompts the operator with fault information. S122, perform a self-test of the test link connectivity. After confirming that each hardware module functions normally, the system further verifies the physical transmission and measurement link of the signal end-to-end. In this sub-step, the main control unit 10 controls the signal excitation unit 30 to output a reference radio frequency signal with a preset frequency and power. This signal does not pass through the device under test 40, but is sent directly to the power measurement module 51 through the directional coupler 61 and other paths. The main control unit 10 reads the measurement value of the power measurement module 51 and compares it with the set value of the signal excitation unit 30. If the difference between the two is within the very small tolerance range preset by the system, it proves that the entire physical link from signal generation to signal measurement is complete and connected. S130, Perform test link loss calibration, which is used to accurately measure and quantify the insertion loss introduced by passive devices such as RF cables, connectors, and directional couplers 61 during the actual calibration process, and generate a calibration file for subsequent data compensation, including the following sub-steps: S131, establish the physical connection for link calibration, and maintain the physical connection method in sub-step S122, that is, the output end of the signal excitation unit 30 is connected to the input end of the directional coupler 61, the power measurement module 51 is connected to the coupling port of the directional coupler 61, and the RF load 62 is connected to the main output end of the directional coupler 61. S132, Perform full-band scanning measurement. Based on the frequency range and step size set in step S110, the main control unit 10 controls the signal excitation unit 30 to scan point by point from the starting frequency to the ending frequency. At each frequency point f, the main control unit 10 controls the signal excitation unit 30 to output a known power level. Simultaneously record the power value measured by the power measurement module 51. S133, calculate and store the link loss. For each frequency point f, the total test link loss L in the system is... path (f) Calculated by the following formula: in, The known power output by the signal excitation unit 30 at frequency point f is expressed in dBm. The power value measured by the power measurement module 51 at frequency point f is expressed in dBm. L path (f) represents the total RF loss calculated at this frequency point, from the output of the signal excitation unit 30 to the input of the power measurement module 51, in dB. The main control unit 10 associates f at all frequency points with their corresponding L... path The numerical pairs in (f) are stored as a link loss compensation file in the form of a data table or array. This file will be called in the subsequent S200 step to correct the original measurement data, eliminate inherent system errors, and ensure the accuracy of the final calibration results.

[0032] S200 performs closed-loop automatic power calibration. For each preset operating frequency and power level, it automatically adjusts the output of the signal excitation unit through an optimized successive approximation algorithm to ensure that the output power of the device under test accurately converges to the target value, and records the excitation level required to reach the target value. This includes the following steps: S210 performs the calibration process traversal and control. The automatic calibration application in the main control unit 10 adopts a nested loop control structure to ensure complete traversal of all calibration points. The outer loop traverses all operating frequency points set in step S110, while the inner loop traverses all set target power levels. The system will perform independent closed-loop calibration for each (frequency, power level) combination in sequence.

[0033] S220 initiates single-point calibration and initial measurement for the selected calibration point in the current cycle, i.e., the operating frequency is f. i The target power level is P. target,j The system performs the following initialization operations: The main control unit 10 first sets the target power level P... target,jThe corresponding power value (in W) is converted to a target power value in logarithmic units. The main control unit 10 controls the excitation unit 30 to operate at frequency f. i It outputs a preset, typically low, initial excitation level. in This represents the initial index of the iterative process. The excitation signal, amplified by the device under test 40, is then used by the power measurement module 51 to measure its original output power. This measurement value is then fed back to the main control unit 10.

[0034] S230, Perform closed-loop adjustment based on optimized successive approximation algorithm. After receiving the raw measurement value fed back by the power measurement module 51, the main control unit 10 starts an iterative adjustment loop. In the k-th iteration, the system executes the following sub-steps: S231, Perform loss compensation for measurement data. The main control unit 10 first finds the current operating frequency f from the link loss compensation file generated in step S130. i The corresponding link loss value L path (f i The original measured value is compensated using the following formula to obtain the true output power of the device under test 40 at the output port. in, For the power measurement module 51 at frequency f during the k-th iteration i The measured raw power value, in dBm; L path (f i () represents the frequency f i The corresponding link loss is expressed in dB. The actual output power after compensation is expressed in dBm.

[0035] S232, calculate the power difference and determine the convergence condition. The main control unit 10 compares the compensated actual output power with the target power and calculates the logarithmic difference ΔP between the two. dB (k): in, The target power value at the current calibration point, in dBm; ΔP dB (k) represents the power difference in the k-th iteration, in dB. After calculating the difference, the system immediately determines whether the absolute value of the difference is less than or equal to a preset accuracy threshold ε. This condition can be expressed as: |ΔP dB (k)|≤ε; If this condition is met, it indicates that the output power of the device under test 40 has reached the preset target accuracy. The system will then exit the current iteration loop and change the output level of the signal excitation unit 30 at this time. Record the result as the final result for this calibration point, and then proceed to step S210 to continue the process for the next calibration point.

[0036] S233, dynamically update the excitation level. If the convergence condition in sub-step S232 is not met, the system needs to adjust the output level of signal excitation unit 30 for the next step (k+1th iteration). It can be calculated using the following formula: in, The output level of signal excitation unit 30 at the k-th iteration is expressed in dBm. The principle behind this formula is to directly use the logarithmic difference between the current output power and the target power as the adjustment amount for the next excitation level. This dynamic step adjustment method allows the system to rapidly approximate the target power when the actual power differs significantly from the target power; conversely, when the two are close, the adjustment amount automatically decreases, thus achieving fine-tuning and avoiding overshoot and oscillations caused by traditional fixed-step algorithms.

[0037] After calculating the new excitation level, the main control unit 10 controls the signal excitation unit 30 to output the new level value. Subsequently, the system returns to the beginning of sub-step S231 and begins a new round of "measurement-compensation-calculation-adjustment" iteration until the convergence condition is met.

[0038] S300 performs calibration data processing and generation, organizing and storing all valid data recorded during the calibration process in a structured manner, and generating a calibration lookup table that can be directly accessed by the device under test based on this structured data, including the following steps: In step S310, the calibration data is structured and stored. For each successfully converged calibration point in step S200, the system has recorded a set of valid data. This set of data contains at least three key pieces of information: the operating frequency, the target power level, and the output excitation level of the finally determined signal excitation unit 30. This step organizes and processes all the collected valid data sets in a unified manner, constructing them into one or more structured datasets.

[0039] As a specific implementation method, this data can be organized into a multidimensional array, or an associative data structure with operating frequency as the first-level index and power level as the second-level index. The main control unit 10 persistently stores this structured dataset. The storage format can be a local database file, a comma-separated value text file, or an Extensible Markup Language (Extreme Markup Language) file, to facilitate subsequent querying, analysis, and retrieval.

[0040] S320: Generate and apply the calibration lookup table. This step generates the final calibration lookup table based on the structured dataset stored in S310. This lookup table is a two-dimensional data matrix, where the row index corresponds to the calibration operating frequency, and the column index corresponds to the target power level. The value stored in the cell located in the i-th row and j-th column of the matrix is ​​the value of the device under test 40 at frequency f. i When the output power reaches the j-th power level, the required precise output excitation level value of the corresponding signal excitation unit 30 is determined. If the frequency points or power level points in the task queue are discontinuous, this step may also include interpolation calculations. The main control unit 10 can use algorithms such as linear interpolation, polynomial interpolation, or spline interpolation to calculate the existing discrete calibration data to generate excitation level values ​​at intermediate points that are not directly calibrated, thereby forming a smoother and more complete lookup table. The generated calibration lookup table is finally exported as a data file in a specific format, which can be read and loaded by the internal control firmware of the device under test 40. In actual operation, when the user sets a working frequency and an output power level for the device under test 40, its internal control firmware does not need to perform real-time measurement or estimation, but directly performs a fast lookup operation in the loaded lookup table to obtain the corresponding precise excitation level, and uses this to drive its internal signal source or preamplifier circuit. In this way, the device under test 40 can accurately control and display its actual output power, thereby achieving the final technical effect of the present invention.

[0041] In summary, this invention transforms the complex power calibration task into a series of interconnected, automatically executable deterministic operations through three major stages: systematic initialization and self-calibration, programmed closed-loop adjustment, and automated data generation. Ultimately, it constitutes and realizes a complete automatic power calibration system for shortwave broadcasting equipment based on a software instrument system.

Claims

1. An automatic power calibration system for shortwave broadcasting equipment based on a software instrument system, characterized in that, include; Main control unit (10); An interface adapter unit (20) is electrically connected to the main control unit (10). The communication control interface is connected to the signal excitation unit (30) of the interface adapter unit (20) to generate an excitation signal and provide it to the device under test (40). The communication control interface is connected to the measurement feedback unit (50) of the interface adapter unit (20) to measure the output power of the device under test (40) and feed back the measured actual output power to the main control unit (10). The main control unit (10) is used to receive the actual output power fed back by the measurement feedback unit (50); and to calculate the next excitation level for the signal excitation unit (30) based on the power difference between the actual output power and the preset target power. The signal excitation unit (30) is controlled to output the next excitation level to iteratively adjust the output power of the device under test (40) until the absolute value of the power difference is less than or equal to the preset accuracy threshold.

2. The automatic power calibration system for shortwave broadcasting equipment based on a software instrument system according to claim 1, characterized in that, The main control unit (10) is used to control the signal excitation unit (30) and the measurement feedback unit (50) to perform full-band scanning before performing the iterative adjustment, so as to measure and store the link loss value corresponding to each frequency point in the test link; During the iterative adjustment process, the actual output power is compensated according to the stored link loss value to obtain the compensated actual output power, and the power difference is calculated based on the compensated actual output power.

3. The automatic power calibration system for shortwave broadcasting equipment based on a software instrument system according to claim 1, characterized in that, When the absolute value of the power difference is less than or equal to the preset accuracy threshold, the main control unit (10) records the current operating frequency, the preset target power, and the finally determined excitation level. After completing all preset calibration points, a calibration lookup table is generated based on all recorded data.

4. The automatic power calibration system for shortwave broadcasting equipment based on a software instrument system according to claim 1, characterized in that, Before performing the iterative adjustment, the main control unit (10) sends a query command to the signal excitation unit (30) and the measurement feedback unit (50) through the interface adapter unit (20) and receives their response in order to perform system self-test.

5. The automatic power calibration system for shortwave broadcasting equipment based on a software instrument system according to claim 1, characterized in that, It also includes a signal processing and transmission unit (60), which includes: A directional coupler (61) has its input port connected to the output of the device under test (40) and its coupling port connected to the measurement feedback unit (50). The radio frequency load (62) is connected to the main output port of the directional coupler (61).

6. A method for automatic power calibration of shortwave broadcasting equipment based on a software instrument system, applied to the automatic power calibration system for shortwave broadcasting equipment based on a software instrument system as described in any one of claims 1-5, characterized in that, Includes the following steps: The control signal excitation unit (30) generates an excitation signal and provides it to the device under test (40). The actual output power is obtained by measuring the output power of the device under test (40) through the measurement feedback unit (50); The next excitation level of the signal excitation unit (30) is calculated based on the power difference between the actual output power and the preset target power. The signal excitation unit (30) is controlled to output the next excitation level, and the aforementioned steps are repeated until the absolute value of the power difference is less than or equal to the preset accuracy threshold.

7. The method for automatic power calibration of shortwave broadcasting equipment based on a software instrument system according to claim 6, characterized in that, Before the control signal excitation unit (30) generates the excitation signal, a full-band scan is performed to measure and store the link loss value corresponding to each frequency point in the test link. The calculation based on the power difference between the actual output power and the preset target power includes the following steps: The actual output power is compensated based on the stored link loss value to obtain the compensated actual output power; The power difference is obtained based on the difference between the actual output power after compensation and the preset target power.

8. The method for automatic power calibration of shortwave broadcasting equipment based on a software instrument system according to claim 6, characterized in that, After the absolute value of the power difference is less than or equal to the preset accuracy threshold, the method further includes: Record the current operating frequency, the preset target power, and the finally determined excitation level; After completing all preset calibration points, a calibration lookup table is generated based on all recorded data.

9. The method for automatic power calibration of shortwave broadcasting equipment based on a software instrument system according to claim 6, characterized in that, Before the control signal excitation unit (30) generates an excitation signal, a query command is sent to the signal excitation unit (30) and the measurement feedback unit (50) and the response is received to perform a system self-test.

10. The method for automatic power calibration of shortwave broadcasting equipment based on a software instrument system according to claim 6, characterized in that, The step of calculating the next excitation level based on the power difference includes the following steps: The power difference is used as an adjustment amount for the excitation level, and added to the current excitation level to obtain the next excitation level.

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