CN112004263A - Group delay fluctuation calibration method and device - Google Patents
Group delay fluctuation calibration method and device Download PDFInfo
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Abstract
The invention provides a group delay fluctuation calibration method and a device, and the method comprises the following steps: receiving a radio frequency signal of a source signal sequence in a bandwidth to be calibrated, and generating a baseband signal based on the radio frequency signal; performing sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal in a module to be calibrated; changing the frequency point of the radio frequency signal in a preset frequency step length in a bandwidth to be calibrated, repeating the steps to obtain time delay values of different frequency points of the bandwidth to be calibrated in sequence, and generating a group time delay fluctuation calibration file based on the time delay values; and performing phase compensation of group delay fluctuation on the corresponding frequency points of the bandwidth to be calibrated according to the group delay fluctuation calibration file. In the invention, a software method is used to obtain the group delay fluctuation calibration data, and the calibration data is used to perform corresponding software phase compensation on the hardware group delay fluctuation, thereby improving the signal transmission quality on the premise of not changing the existing hardware link design.
Description
Technical Field
The invention relates to the field of communication, in particular to a group delay fluctuation calibration method and device.
Background
With the development of communication technology and the upgrade of communication systems, the bandwidth of 4G/5G signals is wider and wider. The wider the signal bandwidth is, the worse the fluctuation index of the in-band group delay in the hardware design is. The group delay reflects how fast the phase changes with frequency. In the signal transmission process, if the group delay fluctuation is large, the signal is distorted. If the problem exists in the communication equipment, the quality of the transmitted signal is deteriorated, the demodulation error rate of the received signal is increased, and the sensitivity is deteriorated; if the problem exists in the instrument, the signal generated by the signal generator cannot reach the standard, and the signal measured by the signal analyzer cannot be accurately demodulated.
Because the influence on the group delay fluctuation index in the hardware link is mainly caused by the group delay fluctuation of the filter, the ideal out-of-band attenuation and the smaller in-band group delay in the filter design are always difficult points of the filter design, and the wider the filter bandwidth is, the higher the out-of-band rejection requirement is, the worse the in-band group delay fluctuation index is inevitably. The traditional method for improving the delay fluctuation of the filter group at present is to add a delay equalizer to the hardware for equalization. However, since the delay equalizer belongs to hardware design, the parameter design is fixed, and only the group delay fluctuation can be relatively reduced passively, but the problem of too large in-band group delay fluctuation cannot be fundamentally solved. And the design of the delay equalizer is increased, so that the insertion loss index of the whole design link is increased, and the out-of-band inhibition index is deteriorated, so that the design of the whole hardware link is changed, and the design volume and the cost of the link are increased. In addition, the method can only improve the group delay fluctuation index of the filter, and can not radically improve the whole group delay fluctuation of the link under the condition of higher requirement on the group delay fluctuation precision
Disclosure of Invention
The embodiment of the invention provides a group delay fluctuation calibration method and device, which are used for at least solving the problem of overlarge in-band group delay fluctuation in the related technology.
According to an embodiment of the present invention, there is provided a group delay fluctuation calibration method, including: receiving a radio frequency signal of a source signal sequence in a bandwidth to be calibrated, and generating a baseband signal based on the radio frequency signal; performing sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal in a module to be calibrated; changing the frequency point of the radio frequency signal in a preset frequency step length in a bandwidth to be calibrated, repeating the steps to obtain time delay values of different frequency points of the bandwidth to be calibrated in sequence, and generating a group time delay fluctuation calibration file based on the time delay values; and performing phase compensation of group delay fluctuation on the corresponding frequency points of the bandwidth to be calibrated according to the group delay fluctuation calibration file.
Wherein, before receiving the radio frequency signal of the source signal sequence in the bandwidth to be calibrated, the method further comprises: based on the source signal sequence, a signal sequence generation module of the signal generator generates corresponding digital signals, the digital signals are converted into analog signals through DAC digital-to-analog change, and the analog signals are converted into radio frequency signals within the bandwidth to be calibrated through a radio frequency link in the signal generation module and output.
Receiving a radio frequency signal of a source signal sequence within a bandwidth to be calibrated, and generating a baseband signal based on the radio frequency signal, including: inputting the radio frequency signal output by the signal generating module into a signal receiving module, performing frequency conversion through a radio frequency link, entering an ADC (analog-to-digital converter) for analog-to-digital change, converting the radio frequency signal into a digital signal, and entering a signal acquisition module for signal acquisition; and carrying out data processing on the acquired signals, and carrying out NCO frequency conversion filtering processing on the data to change the signals into baseband signals.
Performing sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal, including:
and performing sliding correlation calculation on the baseband signal y and the source signal x sequence according to the following formula:
and taking the time delay value corresponding to the time with the maximum correlation as the time delay value of the current frequency point of the radio frequency signal on the link of the module to be calibrated.
In the bandwidth to be calibrated, changing the frequency point of the radio frequency signal by a preset frequency step length, repeating the above steps to sequentially obtain the time delay values of different frequency points in the bandwidth to be calibrated, and generating a group time delay fluctuation calibration file based on the time delay values, including:
let i be i +1, fi＝fstart+ i Δ f, where Δ f is the frequency calibration step, when fi＜＝fstopIf so, repeating the receiving and calculating steps to obtain time delay values of different frequency points in sequence; and taking the time delay value of one of the different frequency points as a standard to obtain the time delay relative values of other frequency points and the frequency point, and storing the time delay relative values in the group time delay fluctuation calibration file.
According to the group delay fluctuation calibration file, performing phase compensation of group delay fluctuation on the frequency points corresponding to the bandwidth to be calibrated, wherein the phase compensation comprises the following steps:
when the module to be calibrated is a signal transmitting module, performing phase compensation of group delay fluctuation on each frequency point in the bandwidth to be calibrated of the transmitted baseband signal; or
And when the module to be calibrated is a signal receiving module, processing the received and acquired signals to obtain baseband signals, and performing phase compensation of group delay fluctuation on each frequency point in the bandwidth to be calibrated of the baseband signals.
Before receiving a radio frequency signal of a source signal sequence within a bandwidth to be calibrated, the method further comprises the following steps: and carrying out Trigger synchronization and clock synchronization on the signal generating module and the signal receiving module.
According to another embodiment of the present invention, there is provided a group delay fluctuation calibration apparatus, including: the signal receiving module is used for receiving a radio frequency signal of a source signal sequence in a bandwidth to be calibrated and generating a baseband signal based on the radio frequency signal; the signal processing module is used for carrying out sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal; a calibration file generation module, configured to change the frequency point of the radio frequency signal in the bandwidth to be calibrated in a predetermined frequency step length, and generate a group delay fluctuation calibration file based on the delay value when the signal receiving module and the signal processing module repeat the above operations to sequentially obtain the delay values of different frequency points of the bandwidth to be calibrated; and the phase compensation module is used for performing phase compensation of group delay fluctuation on the corresponding frequency point of the bandwidth to be calibrated according to the group delay fluctuation calibration file.
Wherein, still include signal generation module, wherein signal generation module includes: a signal generator for generating a corresponding digital signal based on the source signal sequence; a DAC for converting the digital signal to an analog signal; and the first radio frequency link is used for converting the analog signal into a radio frequency signal within the bandwidth to be calibrated and outputting the radio frequency signal.
Wherein, the signal receiving module still includes: the second radio frequency link is used for carrying out frequency conversion on the received radio frequency signal; the ADC is used for carrying out analog-to-digital conversion on the frequency-converted radio-frequency signal into a digital signal; the signal acquisition module is used for acquiring the digital signal; the digital processing module is used for carrying out data processing on the acquired signals; and the filter is used for filtering the signal after the data processing to change the signal into a baseband signal.
Wherein the signal processing module further comprises:
a sliding correlation calculation unit, configured to perform sliding correlation calculation on the baseband signal y and the source signal x sequence according to the following formula:
and the frequency point time delay calculating unit is used for taking the time delay value corresponding to the time with the maximum correlation as the time delay value of the current frequency point of the radio frequency signal in the link of the module to be calibrated.
Wherein the signal processing module further comprises: and the group delay fluctuation calculating unit is used for taking the obtained delay value of one frequency point in the plurality of frequency points as a standard, obtaining the delay relative values of other frequency points and the frequency point and storing the delay relative values in the group delay fluctuation calibration file.
Wherein, the group delay fluctuation phase compensation module further comprises: the first phase compensation unit is used for performing phase compensation of group delay fluctuation on the baseband signals of each frequency point corresponding to the bandwidth to be calibrated when the signal transmitting module is a module to be calibrated; or, the second phase compensation unit is configured to, when the signal receiving module is a module to be calibrated, perform phase compensation of group delay fluctuation on the baseband signal of each frequency point corresponding to the bandwidth to be calibrated after receiving the acquired signal and performing frequency conversion on the signal into the baseband signal.
Wherein, the device still includes: and the synchronous cable is used for connecting the signal generating module and the signal receiving module so as to carry out Trigger synchronization and clock synchronization.
According to yet another embodiment of the present invention, there is also provided a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of the above-mentioned method embodiments when executed.
According to yet another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in the above method embodiments.
In the above embodiments of the present invention, a software method is used to obtain the group delay fluctuation calibration data, and the calibration data is used to perform corresponding software phase compensation on the hardware group delay fluctuation, so that the signal transmission quality can be improved without changing the existing hardware link design.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flow chart of a group delay fluctuation calibration method according to an embodiment of the present invention;
fig. 2 is a block diagram of a group delay fluctuation calibration apparatus according to an embodiment of the present invention;
fig. 3 is a block diagram of a group delay fluctuation calibration system according to an embodiment of the present invention;
fig. 4 is a flow chart of group delay fluctuation calibration according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a group delay fluctuation compensation structure of a transmitting system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a group delay fluctuation compensation structure of a receiving system according to an embodiment of the present invention;
fig. 7 is a flow chart of group delay fluctuation compensation of the transmitting system according to an embodiment of the present invention;
fig. 8 is a flow chart of group delay fluctuation compensation of the receiving system according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The traditional method for improving wideband in-band group delay fluctuation needs to change the original hardware design, add a delay equalizer and further compensate for the index deterioration such as insertion loss and out-of-band inhibition caused by adding the delay equalizer. The method can only reduce but cannot really and completely solve the influence of overlarge fluctuation of the in-band group delay due to fixed parameters, the adaptable bandwidth of the delay equalizer is limited, different designs are needed for covering the bandwidth of 5 MHz-400 MHz by 4G/5G signals, and the method has no flexible applicability.
Therefore, this embodiment provides a group delay fluctuation calibration method, which may calibrate group delay fluctuation of a hardware link by using a software method on the premise of not changing the design of the existing hardware link, and perform corresponding software phase compensation on the hardware group delay fluctuation by using the calibration data, thereby eliminating the influence of the hardware group delay fluctuation on the signal transmission quality. The method does not increase the design cost and the hardware cost, and can be flexibly suitable for the design of signal transmission links with any bandwidth and any type.
As shown in fig. 1, the flow of this embodiment includes the following steps:
step S102, receiving a radio frequency signal of a source signal sequence in a bandwidth to be calibrated, and generating a baseband signal based on the radio frequency signal;
step S104, performing sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal in a module to be calibrated;
step S106, changing the frequency point of the radio frequency signal in a preset frequency step length in the bandwidth to be calibrated, repeating the steps S102 and S104, sequentially obtaining the time delay values of different frequency points of the bandwidth to be calibrated, and generating a group time delay fluctuation calibration file based on the time delay values;
and S108, performing phase compensation of group delay fluctuation on the corresponding frequency point of the bandwidth to be calibrated according to the group delay fluctuation calibration file.
In the above embodiment, before step S102, the signal generation module and the signal receiving module are connected by using a synchronization cable to perform Trigger synchronization and clock synchronization, so as to ensure that the signal sequence generation module, the DAC and the ADC, and the signal acquisition module are synchronized.
In the above embodiment, a known source signal sequence may be adopted, a signal sequence generation module of the signal generator generates a corresponding digital signal, the digital signal is converted into an analog signal through DAC digital-analog conversion, and the analog signal is converted into a radio frequency signal output of the bandwidth start frequency point to be calibrated through a radio frequency link in the signal generation module, that is, fi＝fstart(i＝0)。
In step S102 of the above embodiment, f is output from the signal generation moduleiThe radio frequency signal is input into the signal receiving module, the signal is converted into a digital signal through the radio frequency link and enters the ADC for analog-to-digital change, and the digital signal is converted into a digital signal and enters the signal acquisition module for signal acquisition.
In step S104 of the above embodiment, data processing is performed on the acquired signal, and NCO frequency conversion filtering processing is performed on the data to change the signal into a baseband signal. And performing sliding correlation calculation on the baseband signal y and the source signal x sequence, wherein the calculation formula is as follows:
In step S106 of the above embodiment, i +1, f is set to i ═ fi＝fstart+ i Δ f, where Δ f is the frequency calibration step, when fi＜＝fstopThen, repeating steps S102 to S104 to obtain the time delay values of different frequency points in sequence, and taking the time delay value of one of the frequency points (e.g. the center channel) as a standard to obtain the relative time delay value of the other frequency points to the frequency point, i.e. to obtain fstart～fstopGroup delay fluctuations within the frequency bandwidth.
In step S108 of the above embodiment, the group delay fluctuation calibration and compensation may be performed on the signal transmitting system or the signal receiving system by importing the group delay fluctuation calibration file.
In the embodiment of the invention, under the conditions of not changing the original hardware design, ensuring the original better in-band insertion loss and larger out-of-band inhibition, the method can obtain the group delay fluctuation calibration data of the existing hardware, and the calibration data is utilized to carry out phase compensation, thereby improving the signal transmission quality.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a base station, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a group delay fluctuation calibration apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details of which have been already described are omitted. As used below, the term "module" or "unit" may implement a combination of software and/or hardware of predetermined functions. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 2 is a block diagram of a group delay fluctuation calibration apparatus according to an embodiment of the present invention, and as shown in fig. 2, the apparatus includes a signal receiving module 100, a signal processing module 200, a calibration file generating module 300, and a phase compensation module 400.
The signal receiving module 100 is configured to receive a radio frequency signal of a source signal sequence within a bandwidth to be calibrated, and generate a baseband signal based on the radio frequency signal;
the signal processing module 200 is configured to perform sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal;
the calibration file generating module 300 is configured to change the frequency point of the radio frequency signal in a predetermined frequency step length within the bandwidth to be calibrated, and generate a group delay fluctuation calibration file based on the delay value when the signal receiving module and the signal processing module repeat the above operations to sequentially obtain the delay values of different frequency points of the bandwidth to be calibrated;
the phase compensation module 400 is configured to perform phase compensation of group delay fluctuation on the frequency point corresponding to the bandwidth to be calibrated according to the group delay fluctuation calibration file.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
The following examples are provided to illustrate the steps of the embodiments of the present invention in detail.
Fig. 3 is a schematic diagram of a group delay fluctuation calibration system provided in this embodiment, which is different from the previous group delay fluctuation calibration apparatus in module division. The system mainly comprises a signal generating module, a signal receiving module and a signal processing module. As can be seen from fig. 3, compared with the conventional method of increasing the delay equalizer by group delay fluctuation, the present embodiment has no additional hardware design requirement for the calibrated rf link.
Fig. 4 is a schematic diagram of a group delay fluctuation calibration flow according to this embodiment. As shown in fig. 4, the specific steps are as follows:
step S401: the signal generation module which uses ideal group delay fluctuation or known group delay fluctuation parameters of the radio frequency link is connected with the signal generation module and the signal receiving module by a synchronous cable (see figure 3) to carry out Trigger synchronization and clock synchronization, so that the signal sequence generation module, the DAC and the ADC and the signal acquisition module are ensured to be synchronous.
Step S402: using a known source signal sequence (such as WCDMA signal with 5MHz BW), generating corresponding digital signal by a signal sequence generation module of a signal generator, and converting the digital signal into analog signal through DAC digital-to-analog change, wherein the sampling clock is selected to be fs307.2 MHz. The sampling clock rate cannot be too low because of 1/fsThe minimum resolution of time delay measurement is determined, and the accurate group delay fluctuation parameters cannot be obtained due to the too low resolution, so that the aim of group delay fluctuation calibration cannot be fulfilled.
Step S403: the frequency of the radio frequency signal is converted into a radio frequency signal of a bandwidth initial frequency point to be calibrated, namely fi＝fstart(i＝0)。
Step S404: RF signal fiAnd (6) outputting.
Step S405: f output from signal generating moduleiThe radio frequency signal is input into a signal receiving module, the signal is converted into a digital signal through a radio frequency link and enters an ADC (analog to digital converter) for analog-to-digital conversion, the digital signal is converted into a digital signal and enters a signal acquisition module for signal acquisition, and the acquired data volume is approximately equal to (link time delay x f)s). If the delay value cannot be estimated, as much data as possible is collected. The signal receiving module and the signal generating module adopt the same sampling rate of fsIf the rates are different, the data needs to be interpolated or decimated to ensure subsequent slidingAnd calculating correctness of the correlation.
Step S406: and (3) carrying out data processing on the acquired signals, and firstly carrying out NCO frequency conversion filtering processing on the data to change the signals into zero-frequency baseband signals. Performing sliding correlation calculation on the baseband signal and the source signal sequence, namely respectively delaying the collected baseband signal by j (1/f)s) (j belongs to (0, N-1), N is the total amount of the collected data), and the corresponding time delay value j (1/f) when the correlation is maximum is takens) Is the value of the delay on this radio frequency link.
Step S407: let i be i +1, fi＝fstart+ i Δ f, Δ f is a frequency calibration step).
Step S408: when f isi＜＝fstopAnd if so, repeating the steps S404 to S406 to sequentially obtain the time delay values of different frequency points.
Step S409: the time delay value of one frequency point is taken as a standard, the known group time delay fluctuation of the signal generation module is subtracted to obtain the time delay relative value of other frequency points to the frequency point, and then f can be obtainedstart～fstopThe group delay within the frequency bandwidth fluctuates,
step S410: and storing the time delay value of each frequency point in a corresponding group delay fluctuation calibration file, wherein the file comprises the radio frequency points and corresponding group delay fluctuation information.
Based on the calibration file obtained in the above embodiment, the group delay fluctuation of the transmitting system or the receiving system can be subjected to phase compensation.
Fig. 5 and 6 are schematic diagrams of group delay fluctuation compensation systems of a transmitting system and a receiving system, respectively. As shown in fig. 5 and 6, in this embodiment, only by adding the group delay fluctuation calibration data to the signal processing portions of the signal generating module and the signal receiving module for phase compensation according to the different systems in which the calibrated radio frequency link is located, the influence of the in-band group delay fluctuation in the hardware design on the signal quality can be eliminated.
Fig. 7 and 8 are schematic diagrams of group delay fluctuation compensation processes of a transmitting system and a receiving system, respectively. The method comprises the steps of calibrating the group delay fluctuation of the equipment in the production process of the system equipment, storing the obtained calibration data as a calibration file, and calling the group delay fluctuation calibration data in the calibration file to perform phase compensation of corresponding frequency points in the data processing process of normal work, so that the influence of the group delay fluctuation of link hardware on the signal transmission quality can be eliminated.
The following describes in detail the group delay fluctuation compensation procedure of the transmitting system by embodiments. As shown in fig. 7, the method comprises the following steps:
step S701: when the signal transmitting module works normally, the signal generating module receives a baseband signal;
step S702: importing a group delay fluctuation calibration file to perform group delay fluctuation phase compensation on corresponding frequency points of a signal sequence of the baseband signal so as to make up for the influence of group delay fluctuation of a radio frequency link;
step S703: performing DAC digital-to-analog conversion on the signal;
step S704: the EVM index of the radio frequency signal sent by the signal transmitting module is improved after the signal is subjected to frequency conversion, amplification, filtering and other operations.
The following describes in detail the group delay fluctuation compensation procedure of the receiving system by an embodiment. As shown in fig. 8, the method comprises the following steps:
step S801: when the signal receiving module works normally, the signal receiving module receives the broadband signal and converts and collects the broadband signal into a corresponding digital signal;
step S802: the normally received and collected signals are converted into baseband signals with zero frequency at the central frequency point;
step S803: performing Fast Fourier Transform (FFT) calculation on the baseband signal;
step S804: importing a group delay fluctuation calibration file, and performing phase compensation of group delay fluctuation on each frequency point by using group delay fluctuation calibration data of the corresponding frequency point;
step S805: and performing calculation such as demodulation and decoding on the compensated signal.
It should be noted that the solution for calibrating and compensating group delay fluctuation provided in this embodiment may be applied to all radio frequency links including the fields of mobile communication devices and instruments, and the implementation manner and parameter setting of the specific system solution may be changed accordingly.
Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is configured to perform the steps of the above-mentioned method embodiments when running.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide an electronic device, comprising a memory having a computer program stored therein and a processor configured to execute the computer program to perform the steps in the above-described method embodiments.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. A group delay fluctuation calibration method is characterized by comprising the following steps:
receiving a radio frequency signal of a source signal sequence in a bandwidth to be calibrated, and generating a baseband signal based on the radio frequency signal;
performing sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal in a module to be calibrated;
changing the frequency point of the radio frequency signal in a preset frequency step length in a bandwidth to be calibrated, repeating the steps to obtain time delay values of different frequency points of the bandwidth to be calibrated in sequence, and generating a group time delay fluctuation calibration file based on the time delay values;
and performing phase compensation of group delay fluctuation on the corresponding frequency points of the bandwidth to be calibrated according to the group delay fluctuation calibration file.
2. The method of claim 1, wherein receiving the source signal sequence precedes the radio frequency signal within the bandwidth to be calibrated, further comprising:
based on the source signal sequence, a signal sequence generation module of the signal generator generates corresponding digital signals, the digital signals are converted into analog signals through DAC digital-to-analog change, and the analog signals are converted into radio frequency signals within the bandwidth to be calibrated through a radio frequency link in the signal generation module and output.
3. The method of claim 2, wherein receiving a radio frequency signal of a source signal sequence within a bandwidth to be calibrated and generating a baseband signal based on the radio frequency signal comprises:
inputting the radio frequency signal output by the signal generating module into a signal receiving module, performing frequency conversion through a radio frequency link, entering an ADC (analog-to-digital converter) for analog-to-digital change, converting the radio frequency signal into a digital signal, and entering a signal acquisition module for signal acquisition;
and carrying out data processing on the acquired signals, and carrying out NCO frequency conversion filtering processing on the data to change the signals into baseband signals.
4. The method of claim 3, wherein performing sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal comprises:
and performing sliding correlation calculation on the baseband signal y and the source signal x sequence according to the following formula:
and taking the time delay value corresponding to the time with the maximum correlation as the time delay value of the current frequency point of the radio frequency signal on the link of the module to be calibrated.
5. The method according to claim 4, wherein the frequency point of the radio frequency signal is changed by a predetermined frequency step length in the bandwidth to be calibrated, the above steps are repeated to sequentially obtain the delay values of different frequency points in the bandwidth to be calibrated, and a group delay fluctuation calibration file is generated based on the delay values, including:
let i be i +1, fi＝fstart+ i Δ f, where Δ f is the frequency calibration step, when fi＜＝fstopIf so, repeating the receiving and calculating steps to obtain time delay values of different frequency points in sequence;
and taking the time delay value of one of the different frequency points as a standard to obtain the time delay relative values of other frequency points and the frequency point, and storing the time delay relative values in the group time delay fluctuation calibration file.
6. The method according to claim 1, wherein performing phase compensation of group delay fluctuation on the frequency points corresponding to the bandwidth to be calibrated according to the group delay fluctuation calibration file comprises:
when the module to be calibrated is a signal transmitting module, performing phase compensation of group delay fluctuation on each frequency point in the bandwidth to be calibrated of the transmitted baseband signal; or
And when the module to be calibrated is a signal receiving module, processing the received and acquired signals to obtain baseband signals, and performing phase compensation of group delay fluctuation on each frequency point in the bandwidth to be calibrated of the baseband signals.
7. The method of any one of claims 1 to 6, further comprising, prior to receiving the radio frequency signal of the source signal sequence within the bandwidth to be calibrated:
and carrying out Trigger synchronization and clock synchronization on the signal generating module and the signal receiving module.
8. A group delay fluctuation calibration apparatus, comprising:
the signal receiving module is used for receiving a radio frequency signal of a source signal sequence in a bandwidth to be calibrated and generating a baseband signal based on the radio frequency signal;
the signal processing module is used for carrying out sliding correlation calculation on the baseband signal and the source signal sequence to obtain a time delay value of a current frequency point of the radio frequency signal;
a calibration file generation module, configured to change the frequency point of the radio frequency signal in the bandwidth to be calibrated in a predetermined frequency step length, and generate a group delay fluctuation calibration file based on the delay value when the signal receiving module and the signal processing module repeat the above operations to sequentially obtain the delay values of different frequency points of the bandwidth to be calibrated;
and the phase compensation module is used for performing phase compensation of group delay fluctuation on the corresponding frequency point of the bandwidth to be calibrated according to the group delay fluctuation calibration file.
9. The apparatus of claim 8, further comprising a signal generation module, wherein the signal generation module comprises:
a signal generator for generating a corresponding digital signal based on the source signal sequence;
a DAC for converting the digital signal to an analog signal;
and the first radio frequency link is used for converting the analog signal into a radio frequency signal within the bandwidth to be calibrated and outputting the radio frequency signal.
10. The apparatus of claim 9, wherein the signal receiving module further comprises:
the second radio frequency link is used for carrying out frequency conversion on the received radio frequency signal;
the ADC is used for carrying out analog-to-digital conversion on the frequency-converted radio-frequency signal into a digital signal;
the signal acquisition module is used for acquiring the digital signal;
the digital processing module is used for carrying out data processing on the acquired signals;
and the filter is used for filtering the signal after the data processing to change the signal into a baseband signal.
11. The apparatus of claim 10, wherein the signal processing module further comprises:
a sliding correlation calculation unit, configured to perform sliding correlation calculation on the baseband signal y and the source signal x sequence according to the following formula:
and the frequency point time delay calculating unit is used for taking the time delay value corresponding to the time with the maximum correlation as the time delay value of the current frequency point of the radio frequency signal in the link of the module to be calibrated.
12. The apparatus of claim 11, wherein the signal processing module further comprises:
and the group delay fluctuation calculating unit is used for taking the obtained delay value of one frequency point in the plurality of frequency points as a standard, obtaining the delay relative values of other frequency points and the frequency point and storing the delay relative values in the group delay fluctuation calibration file.
13. The apparatus of claim 8, wherein the phase compensation module further comprises:
the first phase compensation unit is used for performing phase compensation of group delay fluctuation on the baseband signals of each frequency point corresponding to the bandwidth to be calibrated when the signal transmitting module is a module to be calibrated; or
And the second phase compensation unit is used for performing phase compensation of group delay fluctuation on the baseband signals of each frequency point corresponding to the bandwidth to be calibrated after receiving and converting the acquired signals into baseband signals when the signal receiving module is a module to be calibrated.
14. The apparatus of any one of claims 8 to 13, further comprising:
and the synchronous cable is used for connecting the signal generating module and the signal receiving module so as to carry out Trigger synchronization and clock synchronization.
15. A storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 7 when executed.
16. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 7.
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