Broadband radio frequency link calibration method and system

Abstract

The invention discloses a broadband radio frequency link calibration method and a broadband radio frequency link calibration system. The broadband radio frequency link calibration method comprises the following steps: dividing a continuous linear change data segment and a non-linear change data segment; selecting two frequency points of the continuously and linearly changed data segment as calibration test points, and setting each frequency point of the non-linearly changed data segment as a calibration test point; and calibrating the calibration test point by adopting a broadband radio frequency signal, and determining a calibration parameter. According to the invention, appropriate calibration strategies can be applied for different data segments, so that the calibration precision and efficiency are improved, and the calibration process is simplified. In the calibration process, the broadband radio frequency signals are sent, multiple frequency points are covered at the same time, and calibration of more frequency points can be completed in a short time.

Description

Technical Field

[0001] The present invention relates to the field of electronic testing technology, and in particular to a wide-band radio frequency link calibration method and system. Background Art

[0002] At present, most RF calibrations use multiple transmissions of signals of different frequencies within the frequency band to be calibrated, and then multiple measurements of the signals are performed to measure the amplitude and phase response within the frequency band to be measured. If the frequency band to be measured is wide, the current method requires multiple transmissions of multiple frequencies to cover the frequency band to be measured, and the test time is long. For example, if the RF link bandwidth is 10GHz and one calibration test is performed at every 1MHz, then 10,000 points need to be calibrated and tested, and the total measurement time is long, which is inefficient.

[0003] Therefore, it is urgent to propose a wideband RF link calibration method to solve the problem of long calibration time in wideband conditions. Summary of the invention

[0004] The object of the present invention is to provide a wideband radio frequency link calibration method and system to solve the problem of long calibration time in a wideband case.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides a wideband radio frequency link calibration method, comprising:

[0006] According to the change trend of the amplitude phase response data of the radio frequency link, a data segment of continuous linear change and a data segment of nonlinear change are divided, and the data segment of continuous linear change and the data segment of nonlinear change are respectively divided into independent segments;

[0007] Selecting two frequency points of the data segment of continuous linear change as calibration test points, and setting each frequency point of the data segment of nonlinear change as a calibration test point;

[0008] The calibration test point is calibrated using a broadband radio frequency signal to determine calibration parameters.

[0009] Optionally, the process of dividing the data segments into continuous linear changes and nonlinear changes according to the changing trend of the amplitude phase response data of the radio frequency link includes: dividing the radio frequency link into multiple sub-bands according to the frequency range of the radio frequency link, respectively acquiring the amplitude phase response data of each of the sub-bands, and analyzing the changing trend of the amplitude phase response data.

[0010] Optionally, the process of selecting two frequency points of the data segment of the continuous linear change as calibration test points includes: selecting a starting point and an ending point in the data segment of the continuous linear change as the calibration test points.

[0011] Optionally, the process of calibrating the calibration test point using a broadband radio frequency signal includes:

[0012] A linear compensation strategy is adopted for the data segment of continuous linear change, the calibration test point selected in the data segment of continuous linear change is measured, and the response data of other frequency points in the entire data segment are calculated based on the measurement data of the calibration test point and combined with the linear relationship to determine the calibration parameters.

[0013] Optionally, the calibration parameters are determined by linear interpolation or fitting method.

[0014] Optionally, the process of calibrating the calibration test points using a broadband radio frequency signal includes: determining the calibration parameters point by point for the nonlinearly varying data segment.

[0015] Optionally, the process of calibrating the calibration test point using a broadband radio frequency signal includes:

[0016] Sending the broadband radio frequency signal and the synchronization signal;

[0017] The broadband radio frequency signal is connected to the receiving module through the radio frequency link;

[0018] The receiving module demodulates the amplitude response and the phase response according to the synchronization signal;

[0019] The amplitude and phase errors are analyzed and compensated into the radio frequency link as calibration data.

[0020] The present application also proposes a wideband radio frequency link calibration system, which is used to execute the wideband radio frequency link calibration method as described above, comprising:

[0021] A frequency band division unit, used to divide the frequency band into independent continuous linear change data segments and nonlinear change data segments according to the change trend of the amplitude phase response data of the radio frequency link;

[0022] A transmitting module, used for transmitting a waveform broadband radio frequency signal and a synchronization signal;

[0023] A transmission monitoring module, used for coupling the broadband radio frequency signal as a monitoring signal;

[0024] A receiving module, used for receiving and analyzing the broadband radio frequency signal;

[0025] Wherein, the output end of the transmitting module and the input end of the receiving module are connected through a calibration radio frequency line.

[0026] Optionally, the receiving module is further used to parse out amplitude and phase errors.

[0027] Compared with the prior art, the wideband radio frequency link calibration method and system provided by the present invention divides independent continuous linear change data segments and nonlinear change data segments, implements different calibration test strategies, improves calibration efficiency, simplifies the calibration process by reducing the calibration test points of the continuous linear change data segments; enhances the accuracy of calibration, detects and calibrates all frequency points within the nonlinear change data segments, and ensures the accuracy of the area; during the calibration process, a broadband radio frequency signal is used to cover multiple frequency points at the same time, and the calibration of more frequency points can be completed in a shorter time, thereby improving the efficiency of the calibration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of a wideband radio frequency link calibration method in an embodiment of the present invention;

[0029] Figure 2 It is a block diagram of a wideband radio frequency link calibration system in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be described below in conjunction with schematic diagrams, wherein preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art may modify the present invention described herein, and still achieve the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation of the present invention.

[0031] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0034] Please refer to Figure 1 In an embodiment of the present invention, a wideband radio frequency link calibration method is provided, comprising the steps of:

[0035] S1. According to the change trend of the amplitude phase response data of the radio frequency link, a data segment of continuous linear change and a data segment of nonlinear change are divided, and the data segment of continuous linear change and the data segment of nonlinear change are respectively divided into independent segments;

[0036] S2, selecting two frequency points of the data segment of continuous linear change as calibration test points, and setting each frequency point of the data segment of nonlinear change as a calibration test point;

[0037] S3. Calibrate the calibration test point using a broadband radio frequency signal to determine calibration parameters.

[0038] In this embodiment, by analyzing the change trend of the amplitude phase response data on the RF link, the data segments of continuous linear changes and nonlinear changes in the RF link can be accurately identified, and the RF link can be divided into independent segments including multiple continuous linear changes and nonlinear changes; for the continuous linear changes, two representative frequency points are selected as calibration test points, which reduces the calibration test points and the number of frequency points that need to be tested, thereby improving the calibration efficiency. For the nonlinear changes, each frequency point is set as a calibration test point to ensure accurate calibration in these complex areas. Furthermore, a broadband RF signal is used for more efficient calibration. Calibration using a broadband RF signal can cover multiple frequency points at the same time, and can complete the calibration of more frequency points in a shorter time, thereby improving the efficiency of the calibration process.

[0039] In addition, in this embodiment, the determination of calibration parameters helps to optimize the performance of the radio frequency link, including but not limited to the amplitude, phase, frequency stability and signal quality of the signal. Through the method provided in this embodiment, the calibrated radio frequency link can provide clearer and more stable signal transmission, thereby improving communication quality and reducing signal distortion and interference.

[0040] Furthermore, in step S1, the process of dividing the data segments of continuous linear changes and the data segments of nonlinear changes according to the changing trend of the amplitude phase response data of the RF link includes: dividing the RF link into multiple sub-frequency bands according to the frequency range of the RF link, respectively acquiring the amplitude phase response data of each of the sub-frequency bands, and analyzing the changing trend of the amplitude phase response data.

[0041] In this embodiment, the RF link is divided into multiple sub-bands, allowing independent analysis of each sub-band, more finely identifying data segments of continuous linear changes and nonlinear changes, improving the accuracy of the overall calibration, identifying linear and nonlinear change areas that require special attention, and allocating calibration resources in a more targeted manner.

[0042] In a specific example, an implementation of step S1 may be specifically as follows:

[0043] Determine frequency range: Determine the overall frequency range of the RF link.

[0044] Sub-band division: The entire frequency range is divided into multiple sub-bands, where the number and width of the sub-bands depend on the characteristics of the RF link and the required calibration accuracy.

[0045] Get the amplitude phase response data:

[0046] For each sub-band, obtain the amplitude and phase response data. These data can be obtained by sweeping the frequency, that is, measuring the amplitude and phase at each frequency point in the sub-band.

[0047] Analyze the magnitude phase response data:

[0048] Trend analysis: Perform statistical analysis on the amplitude and phase response data of each sub-band to identify the trend of data changes.

[0049] Linear fitting: Perform linear fitting on the amplitude and phase data of each sub-band to determine whether the data presents continuous linear changes.

[0050] Residual Analysis: Calculate the residuals between the actual data and the linear fit to determine if the data deviate from the linear model, thereby identifying nonlinear changes.

[0051] Threshold judgment: Set a threshold to determine whether the residual is within an acceptable range. If the residual exceeds the threshold, it is considered that there is nonlinear change in the sub-band.

[0052] Divide data into segments:

[0053] Continuous linear change data segment: If the change trend of the amplitude phase response data of a sub-band is close to linear and the residual is within an acceptable range, the sub-band is divided into a continuous linear change data segment.

[0054] Nonlinear change data segment: If the change trend of the amplitude phase response data of a sub-frequency band is nonlinear, or the residual exceeds a threshold, the sub-frequency band is divided into a nonlinear change data segment.

[0055] Furthermore, in step S2, the process of selecting two frequency points of the data segment of the continuous linear change as calibration test points includes: selecting a starting point and an ending point in the data segment of the continuous linear change as the calibration test points.

[0056] In a linear change interval, if the data is strictly linear, then any point in the interval can represent the characteristics of the entire interval. However, in reality, due to various factors, the response of the RF link may have slight nonlinearity. Therefore, the selection of the start point and the end point can ensure that the entire linear change interval is covered and any possible nonlinear deviations can be captured.

[0057] In this embodiment, selecting the start point and the end point can simplify the calibration process, because only the measurement and calibration at these two points need to be performed, rather than multiple measurements in the entire interval. Selecting the start point and the end point as calibration test points can capture the key characteristics of the data segment. By selecting only the start point and the end point, the number of test points that need to be calibrated can be reduced, thereby simplifying the calibration process and saving time and resources.

[0058] Additionally, after calibration is complete, the start and end points and possibly the midpoint can be measured again to verify that the calibration effect is consistent across the interval.

[0059] Furthermore, in step S3, the process of calibrating the calibration test point using a broadband radio frequency signal includes:

[0060] A linear compensation strategy is adopted for the data segment of continuous linear change, the calibration test point selected in the data segment of continuous linear change is measured, and the response data of other frequency points in the entire data segment are calculated based on the measurement data of the calibration test point and combined with the linear relationship to determine the calibration parameters.

[0061] In this embodiment, the linear compensation strategy allows the use of a simple mathematical model to predict and compensate for the change in frequency response, which not only simplifies the calibration process but also improves the efficiency of the calibration.

[0062] Specifically, a broadband radio frequency signal is used to perform amplitude and phase measurements at selected calibration test points (starting point and ending point), and the measurement data of these two points are recorded.

[0063] Calculate linear relationships: Determine the linear relationship between amplitude and phase and frequency based on the measured data at the start and end points. Use the established linear equation to calculate the response data for other frequency points within the entire continuous linear change data segment, ensuring that their responses can be estimated even if no direct measurements are taken at these frequency points.

[0064] Based on the calculated response data, the calibration parameters of the RF link are adjusted so that the response of the entire data segment meets the preset performance standards.

[0065] Furthermore, the calibration parameters may be determined for the continuously linearly varying data segment by a linear interpolation or fitting method.

[0066] Furthermore, the process of calibrating the calibration test points using a broadband radio frequency signal includes: determining the calibration parameters point by point for the nonlinearly varying data segment.

[0067] In this embodiment, the calibration is performed using a broadband radio frequency signal, which can cover multiple frequency points at the same time, and can complete the calibration of more frequency points in a shorter time, thereby improving the efficiency of the calibration process.

[0068] Furthermore, the process of calibrating the calibration test point using a broadband radio frequency signal in step S3 includes:

[0069] S31, sending the broadband radio frequency signal and the synchronization signal;

[0070] S32, the broadband radio frequency signal is connected to the receiving module through the radio frequency link;

[0071] S33, the receiving module demodulates the amplitude response and the phase response according to the synchronization signal;

[0072] S34, analyzing the amplitude and phase errors, and compensating them into the radio frequency link as calibration data.

[0073] In this embodiment, a broadband radio frequency signal is sent in each of the divided independent segments, and a synchronization signal is sent, which is used to synchronize the demodulation process at the receiving end.

[0074] It should be noted that the transmission time and interval time of the broadband radio frequency signal and the synchronization signal can be set according to requirements and link characteristics.

[0075] RF link access receiving module: The broadband RF signal passes through the RF link to be calibrated, including amplifiers, filters, mixers and other components.

[0076] The signal is finally connected to the receiving module, which is responsible for capturing and processing the signal, demodulating the amplitude response and phase response. The receiving module demodulates the signal passing through the RF link according to the synchronization signal; during the demodulation process, the amplitude response and phase response data are extracted; the demodulated amplitude and phase responses are compared with the expected ideal responses, and the amplitude and phase errors are calculated. These errors reflect the performance deviation of the RF link under actual working conditions.

[0077] Furthermore, the analyzed amplitude and phase error data are used as calibration data, and the calibration data are compensated into the radio frequency link to correct the performance deviation.

[0078] In a specific example, after the compensation is completed, the broadband RF signal is resent and the above demodulation and error analysis steps are repeated to verify the calibration effect. If the error still exists, the calibration parameters may need to be further adjusted until a satisfactory performance level is achieved.

[0079] In summary, in this embodiment, a wideband RF link calibration method is provided to provide efficient and accurate calibration for the wideband RF link. By analyzing and segmenting the response data and applying targeted calibration strategies, rapid multi-frequency point coverage is achieved, and the synchronization signal improves the calibration synchronization and simplifies the process.

[0080] Embodiment 2

[0081] This embodiment provides a wideband radio frequency link calibration system for executing the wideband radio frequency link calibration method described in the first embodiment. Figure 2 ,include:

[0082] A frequency band division unit, used to divide the frequency band into independent continuous linear change data segments and nonlinear change data segments according to the change trend of the amplitude phase response data of the radio frequency link;

[0083] A transmitting module, used for transmitting a waveform broadband radio frequency signal and a synchronization signal;

[0084] A transmission monitoring module, used for coupling the broadband radio frequency signal as a monitoring signal;

[0085] A receiving module, used for receiving and analyzing the broadband radio frequency signal;

[0086] Wherein, the output end of the transmitting module and the input end of the receiving module are connected through a calibration radio frequency line.

[0087] Furthermore, the receiving module is also used to parse out the amplitude and phase errors.

[0088] In the system provided in this embodiment, the frequency band division unit analyzes the amplitude and phase response data of the RF link and divides the data into data segments with continuous linear changes and data segments with nonlinear changes; the transmitting module sends a broadband RF signal and a synchronization signal, and the RF signal can be connected to the receiving module through the RF link. The receiving module demodulates the amplitude response and the phase response in time according to the synchronization signal. Since a broadband RF signal is used, the number of tests in the frequency band to be tested can be reduced; the transmitting monitoring module couples the transmitted broadband RF signal to generate a monitoring signal; further, the receiving module parses the amplitude and phase errors, uses these data as the basis for calibration compensation, and calibrates and compensates the RF link according to the amplitude and phase errors parsed by the receiving module to correct the performance deviation.

[0089] The system provided in this embodiment can achieve targeted application of different calibration strategies by accurately dividing different data segments, thereby improving calibration efficiency and accuracy. The collaborative work of the transmission monitoring module and the receiving module enables the system to monitor the performance of the RF link in real time and perform calibration in a timely manner. The use of synchronization signals ensures that the receiving module can accurately demodulate the RF signal, thereby improving the synchronization accuracy of the calibration process. The receiving module can accurately resolve the amplitude and phase errors, thereby providing accurate data support for calibration. The design of the entire system integrates multiple modules, making the calibration process more automated and systematic.

[0090] In summary, the present invention discloses a wideband radio frequency link calibration method and system. By accurately analyzing and dividing the amplitude and phase response data of the radio frequency link, the system can apply appropriate calibration strategies for different data segments, thereby improving the accuracy and efficiency of calibration and simplifying the calibration process. During the calibration process, a broadband radio frequency signal is sent, which can cover multiple frequency points at the same time, and can complete the calibration of more frequency points in a shorter time. The use of a synchronous signal during the calibration process improves the synchronization accuracy of the calibration process and reduces the response time.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A wideband radio frequency link calibration method, characterized in that: include: According to the change trend of the amplitude phase response data of the radio frequency link, a data segment of continuous linear change and a data segment of nonlinear change are divided, and the data segment of continuous linear change and the data segment of nonlinear change are respectively divided into independent segments; Selecting two frequency points of the data segment of continuous linear change as calibration test points, and setting each frequency point of the data segment of nonlinear change as a calibration test point; The calibration test point is calibrated using a broadband radio frequency signal to determine calibration parameters.

2. The wideband radio frequency link calibration method according to claim 1, characterized in that: The process of dividing the data segments of continuous linear change and the data segments of nonlinear change according to the change trend of the amplitude phase response data of the radio frequency link includes: dividing the radio frequency link into multiple sub-bands according to the frequency range of the radio frequency link, respectively acquiring the amplitude phase response data of each of the sub-bands, and analyzing the change trend of the amplitude phase response data.

3. The wideband radio frequency link calibration method according to claim 1, wherein: The process of selecting two frequency points of the data segment of continuous linear change as calibration test points includes: selecting a starting point and an ending point in the data segment of continuous linear change as the calibration test points.

4. The wideband radio frequency link calibration method according to claim 3, wherein: The process of calibrating the calibration test point using a broadband radio frequency signal includes: A linear compensation strategy is adopted for the data segment of continuous linear change, the calibration test point selected in the data segment of continuous linear change is measured, and the response data of other frequency points in the entire data segment are calculated based on the measurement data of the calibration test point and combined with the linear relationship to determine the calibration parameters.

5. The wideband radio frequency link calibration method according to claim 4, characterized in that: The calibration parameters are determined by linear interpolation or fitting methods.

6. The wideband radio frequency link calibration method according to claim 1, wherein: The process of calibrating the calibration test points using a broadband radio frequency signal includes: determining the calibration parameters point by point for the nonlinearly varying data segment.

7. The wideband radio frequency link calibration method according to claim 1, wherein: The process of calibrating the calibration test point using a broadband radio frequency signal includes: Sending the broadband radio frequency signal and the synchronization signal; The broadband radio frequency signal is connected to the receiving module through the radio frequency link; The receiving module demodulates the amplitude response and the phase response according to the synchronization signal; The amplitude and phase errors are analyzed and compensated into the radio frequency link as calibration data.

8. A wideband radio frequency link calibration system, used to execute the wideband radio frequency link calibration method according to any one of claims 1 to 7, characterized in that: include: A frequency band division unit, used to divide the frequency band into independent continuous linear change data segments and nonlinear change data segments according to the change trend of the amplitude phase response data of the radio frequency link; A transmitting module, used for transmitting a waveform broadband radio frequency signal and a synchronization signal; A transmission monitoring module, used for coupling the broadband radio frequency signal as a monitoring signal; A receiving module, used for receiving and analyzing the broadband radio frequency signal; Wherein, the output end of the transmitting module and the input end of the receiving module are connected through a calibration radio frequency line.

9. The wideband radio frequency link calibration system as claimed in claim 8, characterized in that: The receiving module is also used to analyze the amplitude and phase errors.

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