ALC Open-Loop Calibration Method and Apparatus for Microwave Analog Signal Sources

Abstract

This invention provides an ALC open-loop calibration method and apparatus for a microwave analog signal source. The method includes setting a current frequency point; obtaining a first calibration parameter for the current frequency point in a closed-loop operating mode of the signal source; obtaining a second calibration parameter for the current frequency point in an open-loop operating mode of the signal source; and obtaining calibration data for the current frequency point based on the first and second calibration parameters. This invention utilizes the internal resources of the signal source for calibration and uses the detector voltage under closed-loop conditions for sampling and comparison, thus obtaining more accurate calibration parameters and ensuring accurate signal output power even in open-loop operation. This invention can efficiently achieve high-power dynamic calibration, reducing the resource consumption of instruments, equipment, and personnel, and improving the overall production and testing efficiency of the signal source.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to an ALC open-loop calibration method and apparatus for a microwave analog signal source. Background Technology

[0002] Microwave analog signal generators typically require the ability to output continuous wave or pulse signals with controllable and stable power. An ALC (Automatic Level Control) loop ensures that the microwave signal generator continuously outputs a stable continuous wave signal. However, microwave signal generators used in radar testing, electronic countermeasures, and other fields often employ pulse-modulated signals with very small pulse widths. In such environments requiring rapid response, the ALC loop often fails to function properly, resulting in the signal generator's output signal not meeting testing requirements. Therefore, when outputting pulse signals, microwave signal generators often need to operate with the ALC loop disabled. In this operating state, corresponding compensation and calibration data are required to ensure the accuracy of the signal output power.

[0003] The calibration process for signal sources must include output power calibration in open-loop operation. A common method is to disconnect the ALC hardware loop using an internal logic switch, while keeping the signal source gain control driver stage unchanged, essentially using the same control circuit as in closed-loop mode. This method is advantageous because it's the easiest to implement in circuit design, the software logic processing is very simple, and the calibration method is completely consistent with closed-loop. However, this method presents some problems in actual calibration: because calibration is done in open loop, to ensure the output power is as accurate as possible at different frequencies, a smaller frequency step calibration is needed compared to open-loop mode. Furthermore, the non-linear relationship between power and voltage requires more precise power step calibration, resulting in a larger data volume and increased calibration time. This method also occupies more equipment. In addition, some self-calibration methods exist. These methods determine the accurate output power of the signal source by reading the voltage obtained from the detector, and then set a specific digital-to-analog converter (DAC) to make the open-loop detector voltage consistent with (or within the confidence interval of) the closed-loop voltage. The DAC settings at this point are recorded as the calibration data for the current point. However, while existing self-calibration methods have solved the problem of equipment occupancy, they suffer from large amounts of calibration data and long calibration times. Summary of the Invention

[0004] This invention provides an ALC open-loop calibration method and apparatus for a microwave analog signal source, which solves the defects of the existing ALC open-loop calibration process, such as small calibration power range and long calibration time, and improves calibration efficiency.

[0005] This invention provides an ALC open-loop calibration method for a microwave analog signal source, comprising:

[0006] Set the current frequency;

[0007] In the closed-loop working mode of the signal source, the output power of the current frequency point is set to the first output power and the voltage of the current frequency point under the first output power is sampled to obtain the first sampling voltage. The first calibration parameter of the current frequency point is obtained according to the first output power and the first sampling voltage.

[0008] In the open-loop operation mode of the signal source, the output power of the current frequency point is set to the second output power and the voltage of the current frequency point under the second output power is sampled to obtain the second sampling voltage. The second calibration parameter of the current frequency point is obtained according to the second output power and the second sampling voltage.

[0009] The calibration data for the current frequency point is obtained based on the first calibration parameter and the second calibration parameter for the current frequency point.

[0010] According to the present invention, an ALC open-loop calibration method for a microwave analog signal source is provided, which further includes, before setting the current frequency point:

[0011] Set a calibration frequency range and a corresponding calibration power range, and establish a linear sampling curve. The linear sampling curve is used to fit the output relationship between the first calibration parameter and the voltage.

[0012] According to the present invention, an ALC open-loop calibration method for a microwave analog signal source is provided, wherein the first output power is the minimum power and the maximum power of the calibration power range, the second output power is the minimum power of the calibration power range, and the third output power is the power that meets the linearity index within the calibration power range.

[0013] According to the present invention, an ALC open-loop calibration method for a microwave analog signal source is provided, wherein obtaining the first calibration parameter of the current frequency point based on the first output power and the first sampling voltage includes:

[0014] The slope of the linear sampling curve is obtained by the difference between the minimum and maximum power of the calibration power range and the difference between the first sampling voltage corresponding to the minimum and maximum power of the calibration power range.

[0015] The first calibration parameter for the current frequency point is obtained based on the slope of the linear sampling curve.

[0016] According to the present invention, an ALC open-loop calibration method for a microwave analog signal source is provided, wherein obtaining the second calibration parameter of the current frequency point based on the second output power and the second sampling voltage includes:

[0017] When the intercept of the linear sampling curve is adjusted so that the second output power is the minimum power in the calibration power range, the second calibration parameter of the current frequency point is obtained based on the intercept of the linear sampling curve.

[0018] According to the present invention, an ALC open-loop calibration method for a microwave analog signal source is provided, wherein the method for obtaining calibration data for the current frequency point based on the first calibration parameter and the second calibration parameter of the current frequency point further includes:

[0019] By fixing the first calibration parameter and the second calibration parameter, the closed-loop sampling voltage and the open-loop sampling voltage corresponding to the same third output power are obtained in the closed-loop working mode and the open-loop working mode of the signal source, respectively.

[0020] If the difference between the closed-loop sampling voltage and the open-loop sampling voltage is less than the error threshold, the first calibration parameter and the second calibration parameter of the current frequency point are output.

[0021] According to the present invention, an ALC open-loop calibration method for a microwave analog signal source is provided. When the difference between the closed-loop sampling voltage and the open-loop sampling voltage is greater than or equal to the error threshold, the range of the first output power is adjusted by using the binary division method, and the voltage under the first output power is resampled.

[0022] The present invention also provides an ALC open-loop calibration device for a microwave analog signal source, comprising:

[0023] The preparation module is used to set the current frequency point;

[0024] The calibration module is used to set the output power of the current frequency point to a first output power in the closed-loop working mode of the signal source and sample the voltage of the current frequency point under the first output power to obtain a first sampling voltage, and obtain the first calibration parameter of the current frequency point based on the first output power and the first sampling voltage.

[0025] It is also used to set the output power of the current frequency point to a second output power and sample the voltage of the current frequency point under the second output power to obtain a second sampling voltage in the open-loop working mode of the signal source, and obtain the second calibration parameter of the current frequency point according to the second output power and the second sampling voltage;

[0026] The output module is used to obtain the calibration data of the current frequency point based on the first calibration parameter and the second calibration parameter of the current frequency point.

[0027] According to the present invention, an ALC open-loop calibration device for a microwave analog signal source is provided, wherein the first calibration parameter and the second calibration parameter of the current frequency point are respectively the configuration parameters of two digital-to-analog converters.

[0028] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the ALC open-loop calibration method for any of the microwave analog signal sources described above.

[0029] This invention provides an open-loop calibration method and apparatus for an ALC (Automatic Calorific Value) system of a microwave analog signal source. The method obtains calculated first and second calibration parameters by performing closed-loop and open-loop calibrations respectively. It can optimize and compensate calibration values ​​based on existing calibration values ​​by combining the first and second calibration parameters. This invention achieves open-loop power self-calibration, enabling calibration over a wider power dynamic range. The apparatus optimizes the hardware design of the ALC loop, using an ADC (Analog-to-Digital Converter) to sample the voltage at sampling points as a calibration reference point. Therefore, the improved apparatus simplifies the calibration method and improves calibration efficiency. The ADC sampling points determine the DAC (Digital Converter) output compensation; that is, by setting the DAC parameters to fit the linear sampling curve of the ADC, accurate calibration data is obtained. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic flowchart of the ALC open-loop calibration method for a microwave analog signal source provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the calibration circuit provided in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the voltage and output power curves of the signal source output frequency of 10GHz after closed-loop calibration, provided in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the voltage and output power curves of the signal source output frequency of 20GHz after closed-loop calibration, provided in an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the structure of the ALC open-loop calibration device for a microwave analog signal source provided in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] The following is combined Figures 1-4 The ALC open-loop calibration method for the microwave analog signal source of the present invention is described as follows: Figure 1 As shown, the ALC open-loop calibration method for a microwave analog signal source according to an embodiment of the present invention includes the following steps:

[0039] Step 101: Set the current frequency point;

[0040] It should be noted that the current frequency point is within the calibration frequency range.

[0041] Step 102: In the closed-loop working mode of the signal source, set the output power of the current frequency point to the first output power and sample the voltage of the current frequency point under the first output power to obtain the first sampling voltage. Based on the first output power and the first sampling voltage, obtain the first calibration parameter of the current frequency point.

[0042] Step 103: In the open-loop working mode of the signal source, set the output power of the current frequency point to the second output power and sample the voltage of the current frequency point under the second output power to obtain the second sampling voltage. Based on the second output power and the second sampling voltage, obtain the second calibration parameter of the current frequency point.

[0043] Step 104: Obtain the calibration data for the current frequency point based on the first calibration parameter and the second calibration parameter of the current frequency point.

[0044] It should be noted that the calibration parameters required to obtain the calibration data at the current frequency point in this embodiment include, but are not limited to, the first and second calibration parameters, as well as the third calibration parameter obtained by looking up a table in the closed-loop case. In this embodiment, the sampled voltage corresponds to the output of a logarithmic amplifier in the circuit, and the analog voltage value acquired by the AD converter is used. The sampling point is used as the reference point for calibration.

[0045] The open-loop ALC calibration method for the microwave analog signal source in this invention, like the traditional method, obtains a third calibration parameter in the closed-loop operating mode of the signal source. Because the value of the third calibration parameter is fine-grained, the traditional method requires considerable effort to accurately determine the third calibration parameter in open-loop mode. This method differs from the traditional method in that, due to the calibration data D under closed-loop conditions... DAC1The relationship between the ADC and the output power is approximately linear, and the data obtained from the sampling points also shows an approximately linear relationship with the output power. Therefore, this method adds a first calibration parameter and a second calibration parameter, and sets the third calibration parameter to a fixed value. By using these three calibration parameters to fit the linear sampling curve of the ADC, accurate calibration data can be obtained, simplifying the calibration process and reducing the workload of the calibration method.

[0046] In at least one embodiment of the present invention, before setting the current frequency point, the method further includes:

[0047] Set a calibration frequency range and a corresponding calibration power range, and establish a linear sampling curve. The linear sampling curve is used to fit the output relationship between the first calibration parameter and the voltage.

[0048] Reference Figure 2 The calibration method of this embodiment will be described in conjunction with the structural schematic diagram of the calibration circuit provided in the embodiment of the present invention. Figure 2 The circuit principle is as follows: the signal output from the signal source is converted into a voltage signal through a coupler and a detector. This voltage signal represents the current output power of the signal source. This voltage value, after being a logarithmic amplifier, has a linear relationship with the output power of the signal source. After sampling by an AD converter, it is converted into a digital signal for processing by the controller. At the same time, the controller configures the output voltages of DAC1, DAC2, and DAC3 according to the parameters obtained from calibration to control the voltage-controlled attenuator to balance the final output signal power.

[0049] Specifically, the third calibration parameter, the first calibration parameter, and the second calibration parameter correspond to the detailed parameters of DAC1, DAC2, and DAC3, respectively. This embodiment uses three 16-bit DACs of the same model, and the parameters of the DACs are 0 to FFFF in hexadecimal, which is 0 to 65535 in decimal.

[0050] The voltage fitted by the linear sampling curve is obtained by the combined output of three DACs. The reference voltage of DAC2 is V. REF The output voltage of DAC2 serves as the reference voltage for DAC1. The output voltage V is obtained by combining the output voltages of DAC1 and DAC3 through a non-inverting adder. OUT The expression for the linear sampling curve is Equation 1:

[0051]

[0052] Where K1 and K2 are Figure 2 The proportional conversion parameter of the operational amplifier, D DAC1 It is a constant, V DAC2 and V DAC3 These are the output voltages of DAC2 and DAC3, respectively. V REF It is a constant, which is +2.5V in this embodiment.

[0053] It should be noted that the data from these three DACs characterize a curve representing a segment of data versus output voltage. The data from DAC2 determines the slope of the curve, and the data from DAC3 determines the intercept. The data from DAC1 can be directly fitted to the curve of actual power versus sampling point voltage using the calibration data under closed-loop conditions and these two parameters. If the linearity of the voltage curve obtained at a certain frequency is good, then the calibration parameter corresponding to that frequency is only D. DAC2 and D DAC3 Using two parameters can greatly reduce the amount of data, and the good linearity makes it easier to fit the data, thus improving calibration efficiency.

[0054] In at least one embodiment of the present invention, the first output power is the minimum power and the maximum power of the calibration power range, the second output power is the minimum power of the calibration power range, and the third output power is the power that meets the linearity index within the calibration power range.

[0055] It should be noted that the minimum power and maximum power of the calibration power range are POW1 and POW2, respectively.

[0056] In at least one embodiment of the present invention, obtaining the first calibration parameter of the current frequency point based on the first output power and the first sampling voltage includes:

[0057] The slope of the sampling curve is obtained by the difference between the minimum and maximum power of the calibration power range and the difference between the first sampling voltage corresponding to the minimum and maximum power of the calibration power range.

[0058] It should be noted that, in the closed-loop operating mode of the signal source, the reference voltages V1 and V2 are respectively used to acquire the POW1 and POW2 signal power, and the slope of the linear sampling curve is obtained.

[0059] The first calibration parameter for the current frequency point is obtained based on the slope of the linear sampling curve.

[0060] It should be noted that, by as well as The first calibration parameter D can be obtained. DAC2 .

[0061] In at least one embodiment of the present invention, obtaining the second calibration parameter of the current frequency point based on the second output power and the second sampling voltage includes:

[0062] When the intercept of the linear sampling curve is adjusted so that the second output power is the minimum power in the calibration power range, the second calibration parameter of the current frequency point is obtained based on the intercept of the linear sampling curve.

[0063] It should be noted that after obtaining the slope, the curve intercept K2V is adjusted. DAC3 The value makes the output power reach POW1, and the DAC3 data at this time is recorded as D. DAC3 .

[0064] In at least one embodiment of the present invention, the step of obtaining calibration data for the current frequency point based on the first calibration parameter and the second calibration parameter of the current frequency point further includes:

[0065] By fixing the first calibration parameter and the second calibration parameter, the closed-loop sampling voltage and the open-loop sampling voltage corresponding to the same third output power are obtained in the closed-loop working mode and the open-loop working mode of the signal source, respectively.

[0066] It should be noted that after fixing the first and second calibration parameters, the calibration voltage output curve at the current frequency is determined. To ensure the accuracy of the signal source output power obtained from this voltage curve, some values ​​need to be selected from the middle of the curve. The sampled voltages of these values ​​are read in closed-loop and open-loop modes, and the difference is calculated. These selected power values ​​follow the principle of "sparse to dense," that is, the value intervals are larger near the starting power point and smaller near the cutoff power point. In addition, the third output power is also selected based on linearity indicators, such as... Figure 4 As shown, if we can obtain as Figure 4 and Figure 5 The relationship between voltage and power indicates good linearity, and the calibration voltage output curve is approximately a straight line.

[0067] If the difference between the closed-loop sampling voltage and the open-loop sampling voltage is less than the error threshold, the first calibration parameter and the second calibration parameter of the current frequency point are output.

[0068] It should be noted that if the calculated voltage and the voltage sampled at the corresponding power point under closed-loop conditions are within a certain error range, the calibration data can be considered valid and stored in the calibration data storage space. The error threshold is the range of voltage changes at the sampling point corresponding to a ±1dBm change in the signal source output power under closed-loop conditions.

[0069] In at least one embodiment of the present invention, when the difference between the closed-loop sampling voltage and the open-loop sampling voltage is greater than or equal to the error threshold, the range of the first output power is adjusted using the dichotomy method, and the voltage under the first output power is resampled.

[0070] It should be noted that in this case, if the two voltage values ​​are out of tolerance, the calibration cutoff power point is set to the midpoint between POW1 and POW2 using the binary method. The above process is repeated, and after completion, the process is repeated from this midpoint to POW2 until the entire calibration task is completed.

[0071] The ALC open-loop calibration method for microwave analog signal sources according to the embodiments of the present invention can achieve high efficiency in calibrating the open-loop output power at a frequency point if the curve obtained from sampling voltage and the calibration data in the closed-loop state have high linearity. It may only take a few cycles to complete the calibration task with large dynamic range.

[0072] The present invention provides a current frequency point calibration method, which includes the following steps:

[0073] Step 301: Determine the calibration frequency range Fmin~Fmax and the corresponding power range POW1~POW2 at the corresponding frequency;

[0074] Step 302: Determine the calibration frequency step Fstep of the signal source;

[0075] Step 303: Set the signal source output frequency to Fmin and the working state to closed-loop mode;

[0076] Step 304: Measure the sampling voltages V1 and V2 corresponding to the output power of the sampling point POW1 and POW2 at the current frequency point respectively;

[0077] Step 305: Determine the slope of the curve and calculate the parameters of DAC2;

[0078] Step 306: Switch the signal source operating mode to open loop;

[0079] Step 307: Adjust the curve intercept to make the signal source output power POW1, and record the parameters of DAC3 at this time;

[0080] Step 308: Fix the two DAC parameters mentioned above, change the signal source output power and select a characteristic value between POW1 and POW2 to obtain the corresponding sampling point voltage;

[0081] Step 309: Switch the signal source working mode to closed loop, and set the output power to measure the voltage at the sampling point.

[0082] Step 310: If the sampling point voltage error in both modes is less than the preset error, then proceed to step 311.

[0083] If the sampling point voltage error in both modes is greater than or equal to the preset error, the power segment is re-divided and calibrated using the binary method and the process returns to step 305.

[0084] Step 311: Record the parameters of DAC2 and DAC3 as the calibration parameters for the current frequency point;

[0085] Step 312: Select the next calibration frequency point;

[0086] Step 313: If the next calibration frequency is less than or equal to the calibration cutoff frequency Fmax, then set the signal source output frequency + Fstep and return to step 304.

[0087] The calibration process ends if the next calibration frequency is greater than the calibration cutoff frequency Fmax.

[0088] It should be noted that this invention can make this function available to users through the interactive interface of the signal source, which can facilitate users to calibrate the open-loop power of the signal source.

[0089] The ALC open-loop calibration device for a microwave analog signal source provided by this invention will be described below. The ALC open-loop calibration device for a microwave analog signal source described below can be referred to in correspondence with the ALC open-loop calibration method for a microwave analog signal source described above. Figure 5 As shown, the apparatus of this embodiment includes:

[0090] Preparation module 501 is used to set the current frequency point;

[0091] The calibration module 502 is used to set the output power of the current frequency point to a first output power in the closed-loop working mode of the signal source and sample the voltage of the current frequency point under the first output power to obtain a first sampling voltage, and obtain the first calibration parameter of the current frequency point according to the first output power and the first sampling voltage.

[0092] It is also used to set the output power of the current frequency point to a second output power and sample the voltage of the current frequency point under the second output power to obtain a second sampling voltage in the open-loop working mode of the signal source, and obtain the second calibration parameter of the current frequency point according to the second output power and the second sampling voltage;

[0093] The output module 503 is used to obtain the calibration data of the current frequency point according to the first calibration parameter and the second calibration parameter of the current frequency point.

[0094] The open-loop ALC calibration device for a microwave analog signal source according to this invention can efficiently perform high-power dynamic calibration, reducing the resource consumption of instruments, equipment, and personnel, and improving the overall production and testing efficiency of the signal source. It utilizes the internal resources of the signal source for calibration and uses the detector voltage under closed-loop conditions for sampling and comparison, thus obtaining more accurate calibration parameters and ensuring that the signal source still has accurate signal output power in open-loop operation.

[0095] In at least one embodiment of the present invention, the first calibration parameter and the second calibration parameter of the current frequency point are respectively the configuration parameters of two digital-to-analog converters.

[0096] In at least one embodiment of the invention, the sampling point is selected after the ALC loop detector is connected to the logarithmic amplifier. The voltage value representing the power obtained here has a linear relationship with the actual output power, such as... Figure 3 and Figure 4 As shown, these two figures are curves plotted after closed-loop calibration, with the power measured at sampling points from -5dBm to +20dBm when the signal source output frequency is 10GHz and 20GHz respectively. The figures show that the voltage and power have a linear relationship. The subsequent open-loop calibration process is to obtain the same curve by fitting the open-loop calibration data when the signal source is working in open-loop mode.

[0097] In at least one embodiment of the present invention, the preparation module 401 is further configured to:

[0098] Set a calibration frequency range and a corresponding calibration power range, and establish a linear sampling curve. The linear sampling curve is used to fit the output relationship between the first calibration parameter and the voltage.

[0099] In at least one embodiment of the present invention, the first output power is the minimum power and the maximum power of the calibration power range, the second output power is the minimum power of the calibration power range, and the third output power is the power that meets the linearity index within the calibration power range.

[0100] In at least one embodiment of the present invention, the calibration module 502 obtains the first calibration parameter of the current frequency point based on the first output power and the first sampling voltage, including:

[0101] The slope of the linear sampling curve is obtained by the difference between the minimum and maximum power of the calibration power range and the difference between the first sampling voltage corresponding to the minimum and maximum power of the calibration power range.

[0102] The first calibration parameter for the current frequency point is obtained based on the slope of the linear sampling curve.

[0103] In at least one embodiment of the present invention, the calibration module 502 obtains a second calibration parameter for the current frequency point based on the second output power and the second sampling voltage, including:

[0104] When the intercept of the linear sampling curve is adjusted so that the second output power is the minimum power in the calibration power range, the second calibration parameter of the current frequency point is obtained based on the intercept of the linear sampling curve.

[0105] In at least one embodiment of the present invention, the output module 503 is further configured to:

[0106] By fixing the first calibration parameter and the second calibration parameter, the closed-loop sampling voltage and the open-loop sampling voltage corresponding to the same third output power are obtained in the closed-loop working mode and the open-loop working mode of the signal source, respectively.

[0107] If the difference between the closed-loop sampling voltage and the open-loop sampling voltage is less than the error threshold, the first calibration parameter and the second calibration parameter of the current frequency point are output.

[0108] In at least one embodiment of the present invention, when the difference between the closed-loop sampling voltage and the open-loop sampling voltage is greater than or equal to the error threshold, the output module 503 adjusts the range of the first output power using the binary method and resamples the voltage under the first output power.

[0109] In at least one embodiment of the present invention, the ALC loop can be implemented using a digital system. The above method involves some calculations implemented through hardware circuits, which limits its flexibility. Implementing the above process using a digital system simplifies the hardware circuitry, provides a faster closed-loop response, and allows for more efficient processing of the calibration procedure, further reducing calibration time.

[0110] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other through the communication bus 640. The processor 610 can call logic instructions in the memory 630 to execute an ALC open-loop calibration method for a microwave analog signal source, the method including:

[0111] Set the current frequency;

[0112] In the closed-loop working mode of the signal source, the output power of the current frequency point is set to the first output power and the voltage of the current frequency point under the first output power is sampled to obtain the first sampling voltage. The first calibration parameter of the current frequency point is obtained according to the first output power and the first sampling voltage.

[0113] In the open-loop operation mode of the signal source, the output power of the current frequency point is set to the second output power and the voltage of the current frequency point under the second output power is sampled to obtain the second sampling voltage. The second calibration parameter of the current frequency point is obtained according to the second output power and the second sampling voltage.

[0114] The calibration data for the current frequency point is obtained based on the first calibration parameter and the second calibration parameter for the current frequency point.

[0115] Furthermore, the logical instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0116] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is capable of executing the ALC open-loop calibration method for the microwave analog signal source provided by the above methods, the method comprising:

[0117] Set the current frequency;

[0118] In the closed-loop working mode of the signal source, the output power of the current frequency point is set to the first output power and the voltage of the current frequency point under the first output power is sampled to obtain the first sampling voltage. The first calibration parameter of the current frequency point is obtained according to the first output power and the first sampling voltage.

[0119] In the open-loop operation mode of the signal source, the output power of the current frequency point is set to the second output power and the voltage of the current frequency point under the second output power is sampled to obtain the second sampling voltage. The second calibration parameter of the current frequency point is obtained according to the second output power and the second sampling voltage.

[0120] The calibration data for the current frequency point is obtained based on the first calibration parameter and the second calibration parameter for the current frequency point.

[0121] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements an ALC open-loop calibration method for a microwave analog signal source provided by the methods described above, the method comprising:

[0122] Set the current frequency;

[0123] In the closed-loop working mode of the signal source, the output power of the current frequency point is set to the first output power and the voltage of the current frequency point under the first output power is sampled to obtain the first sampling voltage. The first calibration parameter of the current frequency point is obtained according to the first output power and the first sampling voltage.

[0124] In the open-loop operation mode of the signal source, the output power of the current frequency point is set to the second output power and the voltage of the current frequency point under the second output power is sampled to obtain the second sampling voltage. The second calibration parameter of the current frequency point is obtained according to the second output power and the second sampling voltage.

[0125] The calibration data for the current frequency point is obtained based on the first calibration parameter and the second calibration parameter for the current frequency point.

[0126] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0127] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ALC open-loop calibration method for a microwave analog signal source, characterized in that, include: Set the current frequency; In the closed-loop working mode of the signal source, the output power of the current frequency point is set to the first output power and the voltage of the current frequency point under the first output power is sampled to obtain the first sampling voltage. The first calibration parameter of the current frequency point is obtained according to the first output power and the first sampling voltage. In the open-loop operation mode of the signal source, the output power of the current frequency point is set to the second output power and the voltage of the current frequency point under the second output power is sampled to obtain the second sampling voltage. The second calibration parameter of the current frequency point is obtained according to the second output power and the second sampling voltage. The calibration data for the current frequency point is obtained based on the first and second calibration parameters of the current frequency point. The step of obtaining calibration data for the current frequency point based on the first and second calibration parameters of the current frequency point, prior to which the following is also included: By fixing the first calibration parameter and the second calibration parameter, the closed-loop sampling voltage and the open-loop sampling voltage corresponding to the same third output power are obtained in the closed-loop working mode and the open-loop working mode of the signal source, respectively. If the difference between the closed-loop sampling voltage and the open-loop sampling voltage is less than the error threshold, the first calibration parameter and the second calibration parameter of the current frequency point are output. If the difference between the closed-loop sampling voltage and the open-loop sampling voltage is greater than or equal to the error threshold, the range of the first output power is adjusted using the binary search method, and the voltage under the first output power is resampled.

2. The ALC open-loop calibration method for a microwave analog signal source according to claim 1, characterized in that, Before setting the current frequency point, the following steps are also included: Set a calibration frequency range and a corresponding calibration power range, and establish a linear sampling curve. The linear sampling curve is used to fit the output relationship between the first calibration parameter and the voltage.

3. The ALC open-loop calibration method for a microwave analog signal source according to claim 2, characterized in that, The first output power is the minimum and maximum power within the calibration power range, the second output power is the minimum power within the calibration power range, and the third output power is the power within the calibration power range that meets the linearity index.

4. The ALC open-loop calibration method for a microwave analog signal source according to claim 3, characterized in that, The step of obtaining the first calibration parameter for the current frequency point based on the first output power and the first sampling voltage includes: The slope of the linear sampling curve is obtained by the difference between the minimum and maximum power of the calibration power range and the difference between the first sampling voltage corresponding to the minimum and maximum power of the calibration power range. The first calibration parameter for the current frequency point is obtained based on the slope of the linear sampling curve.

5. The ALC open-loop calibration method for a microwave analog signal source according to claim 4, characterized in that, The step of obtaining the second calibration parameter for the current frequency point based on the second output power and the second sampling voltage includes: When the intercept of the linear sampling curve is adjusted so that the second output power is the minimum power in the calibration power range, the second calibration parameter of the current frequency point is obtained based on the intercept of the linear sampling curve.

6. An ALC open-loop calibration device for a microwave analog signal source, characterized in that, include: The preparation module is used to set the current frequency point; The calibration module is used to set the output power of the current frequency point to a first output power in the closed-loop working mode of the signal source and sample the voltage of the current frequency point under the first output power to obtain a first sampling voltage, and obtain the first calibration parameter of the current frequency point based on the first output power and the first sampling voltage. It is also used to set the output power of the current frequency point to a second output power and sample the voltage of the current frequency point under the second output power to obtain a second sampling voltage in the open-loop working mode of the signal source, and obtain the second calibration parameter of the current frequency point according to the second output power and the second sampling voltage; The output module is used to obtain the calibration data of the current frequency point based on the first calibration parameter and the second calibration parameter of the current frequency point; The output module is also used before outputting the calibration parameters for: By fixing the first calibration parameter and the second calibration parameter, the closed-loop sampling voltage and the open-loop sampling voltage corresponding to the same third output power are obtained in the closed-loop working mode and the open-loop working mode of the signal source, respectively. If the difference between the closed-loop sampling voltage and the open-loop sampling voltage is less than the error threshold, the first calibration parameter and the second calibration parameter of the current frequency point are output. If the difference between the closed-loop sampling voltage and the open-loop sampling voltage is greater than or equal to the error threshold, the range of the first output power is adjusted using the binary search method, and the voltage under the first output power is resampled.

7. The ALC open-loop calibration device for a microwave analog signal source according to claim 6, characterized in that, The first and second calibration parameters for the current frequency point are the configuration parameters for the two digital-to-analog converters, respectively.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the ALC open-loop calibration method for the microwave analog signal source as described in any one of claims 1 to 5.

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