CN112054885B

CN112054885B - Method and device for determining calibration information

Info

Publication number: CN112054885B
Application number: CN201910487696.8A
Authority: CN
Inventors: 章勇
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2021-12-28
Anticipated expiration: 2039-06-05
Also published as: CN112054885A

Abstract

The embodiment of the invention provides a method and a device for determining calibration information, wherein the method comprises the following steps: a receiving end receives a measuring signal; performing channel estimation on the measurement signal to determine a frequency domain signal; determining amplitude alignment information according to the frequency domain signal; performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window; determining calibration information according to the amplitude alignment information and the phase fitting information, wherein the calibration information is used for carrying out combined calibration on the phase and the amplitude of the signal to be calibrated; the method can reduce the phase fitting error and the amplitude calibration error caused by channel abnormality, thereby improving the amplitude and phase calibration accuracy.

Description

Method and device for determining calibration information

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for determining calibration information and a method and apparatus for determining calibration information.

Background

With the rapid development of mobile communication systems (e.g., 4G (the 4th Generation mobile communication technology, fourth Generation mobile communication technology) systems or 5G (the 5th Generation mobile communication technology, fifth Generation mobile communication technology) systems), user terminals may access the mobile communication systems for various mobile services, such as internet access, video on demand, sending and receiving mails, downloading, and so on.

In communication, signals are not single frequency, but in a certain frequency range, and signals in a wide frequency band are transmitted, because phase delays of signals of different frequencies are not constant, signals have phase changes at a receiving end. In addition, different radio frequency devices have different production processes, which results in different structures of the different radio frequency devices, so that in the communication process, after the different radio frequency devices are adopted for signal transmission, signals transmitted to a receiving end generate phase and amplitude changes. The phase and amplitude variations of the signal at the receiving end distort the received signal. Therefore, during communication, calibration of the phase and amplitude of the signal is required.

The existing phase calibration technology usually performs phase linear fitting on all phases of the whole frequency domain once to obtain corresponding calibration coefficients; however, the phase-frequency characteristics of the analog device or the transmission network cannot be completely ideal, so that the phase is not completely linear in the full bandwidth range of the frequency domain, and a certain error is caused, thereby affecting the calibration accuracy.

Disclosure of Invention

The embodiment of the invention provides a method for determining calibration information, which aims to improve calibration precision.

Correspondingly, the embodiment of the invention also provides a device for determining the calibration information, which is used for ensuring the realization and the application of the method.

In order to solve the above problem, the present invention discloses a method for determining calibration information, which specifically includes:

a receiving end receives a measuring signal, wherein the measuring signal corresponds to N set frequency points, and the set frequency points are determined according to the reference frequency interval of a signal to be calibrated; performing channel estimation on the measurement signal to determine a frequency domain signal; determining amplitude alignment information according to the frequency domain signal; performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window, wherein one sliding window comprises M set frequency points, and M is less than N; determining calibration information according to the amplitude alignment information and the phase fitting information, wherein the calibration information is used for carrying out combined calibration on the phase and the amplitude of the signal to be calibrated; wherein M and N are positive integers.

Optionally, the measurement signal includes a plurality of signals, and one measurement signal corresponds to one channel; the step of determining amplitude alignment information according to the frequency domain signal includes: aiming at a set frequency point, determining the power corresponding to the set frequency point of the intermediate frequency domain signal of each channel; calculating an average of the power; and carrying out amplitude alignment according to the average value to obtain amplitude alignment information corresponding to the set frequency point of the intermediate frequency domain signal of each channel.

Optionally, the step of performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window includes: for one channel, sliding a target window on the frequency domain signal according to a set step length to obtain a plurality of sliding windows; for one sliding window, determining a phase linear fitting curve of the sliding window; and determining the phase fitting information of the sliding window according to the phase linear fitting curve.

Optionally, the step of determining a phase linear fit curve of the sliding window includes: determining the phase of each set frequency point in the sliding window; determining a fitting slope and an initial phase according to the phase; and determining a phase linear fitting curve of the sliding window according to the fitting slope and the initial phase.

Optionally, the step of determining a fitting slope from the phase comprises: determining the phase difference of adjacent set frequency points in the sliding window and the average value of the phase difference; determining a ratio of a set frequency interval of the measurement signal to the reference frequency interval; determining a fitting slope according to the average value and the ratio of the phase difference; the step of determining an initial phase from the phase comprises: and averaging the phases in the sliding window to obtain an initial phase.

Optionally, the step of obtaining the phase fitting information of the sliding window according to the phase linear fitting curve includes: determining a frequency band corresponding to the sliding window; determining reference frequency points in the sliding window according to the frequency band of the sliding window and the reference frequency interval, wherein the reference frequency points comprise set frequency points which are overlapped with the set frequency points; and determining phase fitting information corresponding to each reference frequency point in the sliding window according to the phase linear fitting curve and the reference frequency point in the sliding window.

Optionally, the step of determining calibration information according to the amplitude alignment information and the phase fitting information includes: aiming at a sliding window of a channel, determining the amplitude alignment information of other reference frequency points in the sliding window according to the amplitude alignment information of all set frequency points in the sliding window, wherein the other reference frequency points are reference frequency points which are not overlapped with the set frequency points in the sliding window; determining calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window; and splicing the calibration information of the reference frequency points in each sliding window to obtain calibration information corresponding to the channel.

Optionally, the step of determining calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window includes: and aiming at one reference frequency point, multiplying the amplitude alignment information of the reference frequency point by the phase fitting information to obtain the calibration information of the reference frequency point.

The embodiment of the present invention further provides a device for determining calibration information, which specifically includes: the signal receiving module is used for receiving a measuring signal by a receiving end, wherein the measuring signal corresponds to N set frequency points, and the set frequency points are determined according to the reference frequency interval of the signal to be calibrated; the channel estimation module is used for carrying out channel estimation on the measurement signal and determining a frequency domain signal; the amplitude alignment information determining module is used for determining amplitude alignment information according to the frequency domain signal; the phase fitting module is used for performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window, wherein one sliding window comprises M set frequency points, and M is less than N; the calibration information determining module is used for determining calibration information according to the amplitude alignment information and the phase fitting information, wherein the calibration information is used for performing combined calibration on the phase and the amplitude of the signal to be calibrated; wherein M and N are positive integers.

Optionally, the measurement signal includes a plurality of signals, and one measurement signal corresponds to one channel; the amplitude alignment information determination module includes: the power determining submodule is used for determining the power corresponding to the set frequency point of the intermediate frequency domain signal of each channel aiming at one set frequency point; the average power calculation submodule is used for calculating the average value of the power; and the amplitude aligning submodule is used for carrying out amplitude aligning according to the average value to obtain amplitude aligning information corresponding to the set frequency point of the intermediate frequency domain signal of each channel.

Optionally, the phase fitting module comprises: the sliding submodule is used for sliding on the frequency domain signal by adopting a target window according to a set step length aiming at one channel to obtain a plurality of sliding windows; the phase fitting curve determination submodule is used for determining a phase linear fitting curve of a sliding window aiming at the sliding window; and the phase fitting information determining submodule is used for determining the phase fitting information of the sliding window according to the phase linear fitting curve.

Optionally, the phase fitting curve determining submodule is configured to determine a phase of each set frequency point in the sliding window; determining a fitting slope and an initial phase according to the phase; and determining a phase linear fitting curve of the sliding window according to the fitting slope and the initial phase.

Optionally, the phase fitting curve determining submodule is specifically configured to determine a phase difference between adjacent set frequency points in the sliding window and an average value of the phase difference; determining a ratio of a set frequency interval of the measurement signal to the reference frequency interval; determining a fitting slope according to the average value and the ratio of the phase difference; and the phase fitting curve determining submodule is specifically used for averaging the phases in the sliding window to obtain an initial phase.

Optionally, the phase fitting information determining submodule is configured to determine a frequency band corresponding to the sliding window; determining reference frequency points in the sliding window according to the frequency band of the sliding window and the reference frequency interval, wherein the reference frequency points comprise set frequency points which are overlapped with the set frequency points; and determining phase fitting information corresponding to each reference frequency point in the sliding window according to the phase linear fitting curve and the reference frequency point in the sliding window.

Optionally, the calibration information determining module is configured to determine, for a sliding window of one channel, amplitude alignment information of other reference frequency points in the sliding window according to the amplitude alignment information of each set frequency point in the sliding window, where the other reference frequency points are reference frequency points that are not coincident with the set frequency points in the sliding window; determining calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window; and splicing the calibration information of the reference frequency points in each sliding window to obtain calibration information corresponding to the channel.

Optionally, the calibration information determining module is specifically configured to, for a reference frequency point, multiply the amplitude alignment information of the reference frequency point by the phase fitting information to obtain the calibration information of the reference frequency point.

Compared with the prior art, the embodiment of the invention has the following advantages:

in the embodiment of the invention, after a receiving end receives a measuring signal, channel estimation can be carried out on the measuring signal to obtain a frequency domain signal; determining amplitude alignment information according to the frequency domain signal; performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window; determining calibration information according to the amplitude alignment information and the phase fitting information so as to perform combined calibration on the phase and the amplitude of the signal to be calibrated; the phase fitting information corresponding to each sub-frequency band is obtained by performing phase linear fitting on the sub-frequency band corresponding to each sliding window respectively, and the phase in each sub-frequency band is more linear relative to the phase in the whole frequency band of the frequency domain signal, so that compared with the prior art in which one-time fitting is performed on the whole frequency band of the frequency domain signal, the phase fitting error can be reduced and the phase calibration accuracy can be improved. In addition, in the embodiment of the invention, the amplitude alignment information of the set frequency points is calculated according to the average value of the set frequency point power in each channel, so that the problem of low amplitude calibration precision caused by the fact that the amplitude of a corresponding channel is reduced due to the abnormity of a part of channels when the minimum amplitude alignment is adopted can be avoided, and the calibration precision is further improved.

Drawings

FIG. 1 is a flow chart of the steps of one embodiment of a method of determining calibration information of the present invention;

FIG. 2 is a flow chart of the steps of an alternative embodiment of a method of determining calibration information of the present invention;

fig. 3a is a schematic diagram of frequency positions corresponding to set frequency points in a measurement sequence according to an embodiment of the present invention;

fig. 3b is a schematic diagram of a measurement signal of a transmitting end according to an embodiment of the present invention;

fig. 3c is a schematic diagram of a measurement signal at a receiving end according to an embodiment of the present invention;

FIG. 3d is a schematic diagram of a frequency domain transformed measurement signal in accordance with an embodiment of the present invention;

fig. 3e is a schematic diagram of a frequency domain signal response corresponding to each set frequency point on a frequency domain signal according to an embodiment of the present invention;

FIG. 3f is a schematic view of a sliding window according to an embodiment of the present invention;

fig. 3g is a schematic diagram of calculating amplitude alignment information corresponding to set frequency points according to an embodiment of the present invention;

fig. 3h is a schematic diagram of calculating calibration information of each reference frequency point in a signal to be calibrated according to an embodiment of the present invention;

FIG. 4 is a block diagram of an embodiment of an apparatus for determining calibration information according to the present invention;

fig. 5 is a block diagram of an alternative embodiment of an apparatus for determining calibration information according to the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

One of the core ideas of the embodiments of the present invention is that amplitude alignment information can be determined according to the frequency domain signal, a frequency band of the frequency domain signal is divided into a plurality of sub-frequency bands, phase linear fitting is performed on each sub-frequency band to obtain phase fitting information corresponding to each sub-frequency band, and calibration information is determined according to the amplitude alignment information and the phase fitting information to perform joint calibration on the phase and the amplitude of the signal to be calibrated, so as to improve calibration accuracy.

Referring to fig. 1, a flowchart illustrating steps of an embodiment of a method for determining calibration information according to the present invention is shown, which may specifically include the following steps:

step 101, a receiving end receives a measurement signal, wherein the measurement signal corresponds to N set frequency points, and the set frequency points are determined according to a reference frequency interval of a signal to be calibrated.

In the embodiment of the invention, a sending end can generate a measuring signal according to a measuring sequence and send the measuring signal to a receiving end, and the receiving end receives the measuring signal; the measurement sequence includes N set frequency points (N is a positive integer), and the set frequency points are determined according to a reference frequency interval of a signal to be calibrated (which may refer to an interval between any two adjacent reference frequency points in the reference frequency points included in the signal to be calibrated), for example, the set frequency interval of the set frequency points may be K times of the reference frequency interval, where K is a positive integer; correspondingly, the measurement signal may also include the N set frequency points. The signal to be calibrated and the measurement sequence may be signals belonging to the same frequency band, and the signal to be calibrated may be a signal whose phase and amplitude need to be calibrated. In the embodiment of the invention, after receiving the measurement signal, the receiving end can process the measurement signal to determine the calibration information corresponding to the signal to be calibrated, and then subsequently after receiving the signal to be calibrated, the receiving end can calibrate the signal to be calibrated according to the calibration information.

The measurement signals of the sending end and the receiving end can be time domain signals, the measurement sequence can be subjected to time domain transformation to obtain measurement signals, and the sending end sends the measurement signals to the receiving end.

And 102, performing channel estimation on the measurement signal to determine a frequency domain signal.

After receiving the measurement signal, the receiving end may perform frequency domain transformation on the measurement signal, and then perform channel estimation on the measurement signal after the frequency domain transformation to obtain a frequency domain signal; the frequency domain signal may also include N set frequency points corresponding to the N set frequency points of the measurement sequence.

In the embodiment of the present invention, the frequency domain signal may be processed to determine corresponding amplitude alignment information and phase fitting information, and then determine corresponding calibration information according to the alignment information and the phase fitting information, which may refer to steps 103 to 105.

And 103, determining amplitude alignment information according to the frequency domain signal.

In the embodiment of the invention, the power of a set frequency point can be determined aiming at the set frequency point, and then the amplitude alignment information corresponding to the set frequency point is determined according to the power; and the amplitude alignment information is used for carrying out amplitude calibration on the signal to be calibrated.

And 104, performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window.

The embodiment of the invention can adopt a sliding window type phase linear fitting method to perform phase fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window so as to perform phase calibration on the signal to be calibrated. In the embodiment of the present invention, the sliding window type phase linear fitting may refer to: sliding a target window on the frequency domain signal to obtain a plurality of sliding windows, and performing phase linear fitting on each sliding window to obtain phase fitting information corresponding to each sliding window; the target window can be designed according to requirements, and further, two edges and a sliding window center can be designed for the target window, wherein the first edge and the second edge can be respectively located on two sides of the target window, and the sliding window center can be located between the first edge and the second edge; alternatively, the lengths of the first edge, the second edge, and the center of the sliding window may be the same, for example, the length of the target window may be designed to be 3 × L Δ f, and the lengths of the first edge, the second edge, and the center of the sliding window may be L Δ f; each sliding window may correspond to one target window, and each sliding window may include two guard bands and one effective band, where the guard bands and the effective bands of the sliding window correspond to the guard bands and the effective bands of the target window, respectively, and accordingly, the length of the sliding window, the length of the guard bands in the sliding window, and the length of the effective bands may correspond to the length of the target window, the length of the guard bands in the target window, and the length of the effective bands, respectively; the phase fitting method comprises the steps that phases corresponding to all set frequency points in a sliding window can be obtained for the sliding window, and phase linear fitting is carried out on the sliding window according to the phases to obtain phase fitting information corresponding to the sliding window.

In the embodiment of the present invention, the type of the target window may be set as required, such as a hamming window, a hanning window, and the like, which is not limited in the present invention. The target window correspondingly obtains one sliding window every time the target window slides on the frequency domain signal, and each sliding window comprises M set frequency points (wherein M is less than N, and M is a positive integer) and corresponds to one sub-frequency band on the frequency domain signal, so that the whole frequency band of the frequency domain signal can be divided into a plurality of sub-frequency bands in the sliding process of the target window on the frequency domain signal; therefore, the phase fitting information corresponding to the sliding window, that is, the phase fitting information corresponding to the corresponding sub-band.

And 105, determining calibration information according to the amplitude alignment information and the phase fitting information, wherein the calibration information is used for performing combined calibration on the phase and the amplitude of the signal to be calibrated.

In the embodiment of the present invention, the phase fitting information corresponding to each sliding window may include phase fitting information of each reference frequency point contained in the sliding window, and therefore, for each sliding window, the amplitude alignment information of each reference frequency point in the sliding window may be determined according to the amplitude alignment information corresponding to the set frequency point in the sliding window; then according to the phase fitting information and the amplitude aligning information of each reference frequency point in the sliding window, determining the calibration information of each reference frequency point in the sliding window; then, the calibration information of each reference frequency point in each sliding window is spliced, and the calibration information of the full frequency band corresponding to the measurement information, namely the calibration information of the full frequency band corresponding to the to-be-calibrated information, can be obtained.

And when the subsequent receiving end receives the signal to be calibrated, amplitude calibration and phase calibration can be carried out on the information to be calibrated according to the determined calibration information.

In summary, in the embodiments of the present invention, after receiving a measurement signal, a receiving end may perform channel estimation on the measurement signal to obtain a frequency domain signal, determine amplitude alignment information according to the frequency domain signal, perform sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window, and further determine calibration information according to the amplitude alignment information and the phase fitting information to perform joint calibration on the phase and the amplitude of the signal to be calibrated, so as to improve calibration accuracy, where the measurement signal corresponds to N set frequency points, one sliding window includes M set frequency points, M < N, M and N are positive integers, the set frequency points are determined according to a reference frequency interval of the signal to be calibrated, where one sliding window may correspond to one sub-band on the frequency domain signal to perform phase linear fitting on the sub-band corresponding to each sliding window respectively, the phase fitting information corresponding to each sub-frequency band is obtained, and the phase in each sub-frequency band is more linear relative to the phase in the whole frequency band of the frequency domain signal, so that compared with the prior art in which the phase in the whole frequency band of the frequency domain signal is fitted once, the phase fitting method and the phase fitting device can reduce the fitting error and improve the accuracy of phase calibration.

Referring to fig. 2, a flowchart illustrating steps of an embodiment of a method for determining calibration information according to the present invention is shown, where the method is used to determine the phase fitting information, and specifically includes the following steps:

step 201, a receiving end receives a measurement signal, wherein the measurement signal corresponds to N set frequency points, and the set frequency points are determined according to a reference frequency interval of a signal to be calibrated.

In the embodiment of the present invention, the number of the measurement sequences may be multiple, each measurement sequence is subjected to time domain transformation, and a measurement signal may be obtained correspondingly, the transmitting end may transmit multiple measurement signals to the receiving end through multiple channels, and the receiving end may receive corresponding measurement signals through each channel.

In an example of the present invention, the reference frequency points of the signal to be calibrated may include all black squares and white squares in fig. 3a, a position corresponding to each set frequency point on one measurement sequence may be as shown in the black squares in fig. 3a, a distance between two adjacent set frequency points on the measurement sequence may be set as a set frequency interval, Δ f may be the set frequency interval, and Δ f is 4 × Δ f_res，Δf_resThe frequency interval may be a reference frequency interval of a signal to be calibrated in practical application, that is, a frequency interval of two adjacent reference frequency points.

In the embodiment of the present invention, for a measurement sequence, the sending end may perform time domain transformation on the measurement sequence shown in fig. 3a to obtain a measurement signal shown in fig. 3b, and then send the measurement signal to the receiving end, so that the receiving end receives the measurement signal shown in fig. 3 c. In the process of transmission, the measurement signal may be affected by various factors in the transmission medium, so that the measurement signal received by the receiver is not identical to the measurement signal transmitted by the transmitter, resulting in a difference between the measurement signals in fig. 3b and fig. 3 c.

Step 202, performing channel estimation on the measurement signal, and determining a frequency domain signal.

After receiving a plurality of measurement signals correspondingly transmitted through a plurality of channels, the receiving end can perform frequency domain transformation on the measurement signal corresponding to each channel, and then perform channel estimation on the measurement signal after frequency domain transformation to correspondingly obtain a frequency domain signal.

The following description will take an example of a measurement signal corresponding to one channel.

In the embodiment of the present invention, for a frequency domain signal, the measurement signal received by the receiving end and shown in fig. 3c may be subjected to frequency domain transformation to obtain a measurement signal after frequency domain transformation as shown in fig. 3d, and then subjected to channel estimation to obtain a frequency domain signal, where channel estimation is performed on each set frequency point on the measurement signal after frequency domain transformation to obtain a frequency domain signal response corresponding to each set frequency point on the frequency domain signal as shown in fig. 3 e; the position of each set frequency point on the measurement signal after frequency domain transformation is the same as the position of the corresponding set frequency point on the measurement sequence, for example, the position of the set frequency point 1 in fig. 3d corresponds to the position of the set frequency point 1 in fig. 3 a; in the embodiment of the invention, each set frequency point on the measurement signal after frequency domain transformation can be multiplied by the corresponding set frequency point on the measurement sequence to obtain the frequency domain signal response corresponding to each set frequency point, thereby obtaining the frequency domain signal.

In another embodiment of the present invention, after performing channel estimation on the measurement signal after frequency domain transformation, the frequency domain signal may be further subjected to noise suppression and other processing; the frequency domain signal response corresponding to each set frequency point in the frequency domain signal may be transformed into a time domain signal response, and after performing noise suppression processing on the time domain signal response, frequency domain conversion is performed to obtain a frequency domain signal response after noise suppression, for example, when the number N of the set frequency points of the frequency domain signal is: when the number of channels is M, the frequency domain signal response corresponding to each set frequency point in each channel can be denoted as H (M, N), where W is the frequency band of the frequency domain signal, Δ f is the set frequency interval, M is 1,2, …, M, N is 1,2, …, N; transforming the frequency domain signal response H (m, n) into a time domain signal response H (m, n), and performing noise suppression on the time domain signal response in a manner including, but not limited to, the following manners: h (m, N) around the maximum max (| h (m, N) |) (for example, N/4 samples around the peak max (| h (m, N) |) are retained, N × 1/16 before the peak and N × 3/16 after the peak are taken, and the rest h (m, N) is set to 0); and then, carrying out frequency domain conversion on the time domain signal response to obtain the frequency domain signal response H' (m, n) after noise suppression.

Certainly, when the signal-to-noise ratio of the transmission network is higher, the frequency domain signal response may not need to be subjected to de-noising processing and other processing, so as to simplify the step of determining the calibration information; the embodiments of the present invention are not limited in this regard.

And 203, sliding on the frequency domain signal by adopting a target window according to a set step length aiming at one channel to obtain a plurality of sliding windows.

In the embodiment of the present invention, a target window may be adopted to slide on the frequency domain signal according to a set step length, the frequency domain signal is divided into a plurality of sliding windows, and one sliding window corresponds to one sub-frequency band on the frequency domain signal; the set step length can be set according to the frequency band of the frequency domain signal; for example, when the length of the sliding window is 3 × L Δ f (W ═ N × Δ f > ═ 3 × L × Δ f,), the set step size may be L Δ f (i.e., each sliding distance is L Δ f), where W is the frequency band of the frequency domain signal and Δ f is the set frequency interval, and the frequency domain signal is divided into (N-L × (2)/(3 × L-L ═ 2) ═ N/L) -2 ═ P sliding windows.

And 204, aiming at one sliding window, determining a phase linear fitting curve of the sliding window.

And after a plurality of sliding windows are correspondingly obtained, the phase corresponding to each set frequency point in each sliding window is approximately linear, and phase linear fitting can be respectively carried out on the corresponding set frequency points in each sliding window to obtain a phase linear fitting curve corresponding to each sliding window.

The following description will be given taking a sliding window as an example.

Wherein a phase linear fit curve of the sliding window may be determined with reference to the following steps:

and a substep 41 of determining the phase of each set frequency point in the sliding window.

And a substep 42 of determining the phase difference of adjacent set frequency points in the sliding window and the average value of the phase difference.

Substep 43, determining the ratio of the set frequency interval of the measurement signal to the reference frequency interval.

And a substep 44 of determining a fitting slope based on the average value and the ratio of the phase differences.

And a substep 45 of averaging the phases in the sliding window to obtain an initial phase.

Substep 46, determining a phase linear fit curve of the sliding window based on the fitted slope and the initial phase.

In the embodiment of the invention, aiming at one sliding window, the phase corresponding to each set frequency point in the sliding window can be obtained, and the phase corresponding to each set frequency point in the sliding window is averaged to obtain the initial phase; calculating the phase difference of adjacent set frequency points to obtain the average value of the phase difference of each adjacent set frequency point in the sliding window, then determining the ratio of the set frequency interval of the measuring signal to the reference frequency interval, and determining the fitting slope according to the average value and the ratio of the phase difference; then, according to the fitted slope and the initial phase, a phase linear fitted curve of the sliding window is determined.

In an example of the present invention, when the length of the sliding window is 3 × L Δ f, and the set step length is L Δ f (that is, each sliding distance is L Δ f), for a sliding window of one channel, such as the sliding window P in the channel m, the phase corresponding to each set frequency point in the sliding window may be obtained through, for example, a CORDIC algorithm (Coordinate Rotation Digital Computer): phi (m, n, p) ═ arg (H '(m, n, p)), where n represents the nth set frequency point in the sliding window, n is 1, …,3 × L, phi (m, n, p) represents the phase corresponding to the set frequency point, H' (m, n, p) represents the frequency domain signal response corresponding to the set frequency point after passing noise suppression, a (m, n, p)) represents the frequency domain signal response corresponding to the set frequency point after passing noise suppression, and a (m, n, p)) represents the frequency domain signal response corresponding to the set frequency point after passing noise suppressionrg is phase taking operation; averaging the phases corresponding to the 3 × L set frequency points in the sliding window to obtain an initial phase: phi _ avg (m, p) ═ Σ_{n＝1,…,3*L}(phi (m, n, p))/(3 x L), where phi _ avg (m, p) represents the initial phase of the sliding window, and Σ is the summing operation; and calculating the phase difference of each adjacent set frequency point in the sliding window: Δ phi (m, n, p) ═ phi (m, n +1, p) -phi (m, n, p), where Δ phi (m, n, p) denotes the phase difference between adjacent set frequency points; averaging the (3 x L-1) phase differences within the sliding window: Δ phi _ avg (m, p) ═ mean (Δ phi (m, n, p),2), where Δ phi _ avg (m, p) represents the average of the phase differences within the sliding window, mean (×) is the averaging operation, mean (x,2) represents the averaging of the columns of matrix x; determining a set frequency interval (Δ f) of the measurement signal and the reference frequency interval (Δ f)_res) Selecting the ratio of delta f to K x delta f_resWherein K is a positive integer; and determining the fitting slope as follows according to the average value delta phi _ avg (m, p) of the phase difference and the ratio K: Δ phi _ res _ avg (m, p) ═ Δ phi _ avg (m, p)/K, where Δ phi _ res _ avg (m, p) represents the fit slope of the sliding window; then, according to the fitting slope Δ phi _ res _ avg (m, p) and the initial phase phi _ avg (m, p), determining a phase linear fitting curve of the sliding window: phi _ new (m, n ", p) ═ n '× Δ phi _ res _ avg (m, p) + phi _ avg (m, p), where n' ═ n" + Δ n ", n" denotes the nth "reference frequency point in the sliding window, n" ═ 1,2, …,3 × L × K, Δ n "is the difference between the index value of the initial phase phi _ avg (m, p) corresponding to the reference frequency point in the sliding window p and the index value of the first reference frequency point in the sliding window p, where the index value of the reference frequency point may be the frequency corresponding to the reference frequency point, or may be other parameters corresponding to the reference frequency point, which is not limited in this invention.

And step 205, determining phase fitting information of the sliding window according to the phase linear fitting curve aiming at one sliding window.

In the embodiment of the present invention, the phase fitting information of the sliding window may be determined by referring to the following steps:

and a substep 51 of determining a frequency band corresponding to the sliding window.

And a substep 52 of determining reference frequency points in the sliding window according to the frequency band of the sliding window and the reference frequency interval, wherein the reference frequency points comprise set frequency points which are overlapped with the set frequency points.

And a substep 53, determining phase fitting information corresponding to each reference frequency point in the sliding window according to the phase linear fitting curve and the reference frequency point in the sliding window.

In one example of the present invention, as shown in fig. 3f, when the length of the sliding window is 3 × L Δ f, the step size is set to L Δ f, and Δ f is 4 × Δ f_resWhen L corresponds to 4 reference frequency points and one sliding window corresponds to 3 × 4 — 12 reference frequency points, one sliding window includes reference frequency point 1, reference frequency point 2 …, and reference frequency point 12 (12 reference frequency points in total); one sliding window comprises a first edge, a sliding window center and a second edge, wherein the first edge can comprise a reference frequency point 1, a reference frequency point 2, a reference frequency point 3 and a reference frequency point 4, the sliding window center comprises a reference frequency point 5, a reference frequency point 6, a reference frequency point 7 and a reference frequency point 8, and the second edge comprises a reference frequency point 9, a reference frequency point 10, a reference frequency point 11 and a reference frequency point 12; the sliding windows can also be divided into edge sliding windows (sliding window 1 and sliding window P as shown in fig. 3 f) and non-edge sliding windows (sliding window 2 to sliding window P-1 as shown in fig. 3 f); for edge sliding window 1, a curve can be linearly fitted according to the phase of step 204: phi _ new (m, n ″, p) ═ n' × Δ phi _ res _ avg (m, p) + phi _ avg (m, p), the values phi _ new (m,1, p), phi _ new (m,2, p) … phi _ new (m,8, p) of reference bin 1 and reference bin 2 … corresponding to the first edge and the center of the sliding window 1 (8 reference bins in total) are calculated, and the 8 values phi _ new (m,1, p), phi _ new (m,2, p) … phi _ new (m,8, p) are calculated as follows: rot _ coef (m, n ", p) ═ exp (-j (phi _ new (m, n", p))), wherein rot _ coef (m, n ", p) represents the rotation coefficient of each reference frequency point in the sliding window, n 'represents the nth" reference frequency point of the sliding window, n' ═ 1,2, …, 3L & ltx.K), and corresponding 8 phase fitting information, namely corresponding 8 rotation coefficients rot _ coef (m,1, p), rot _ coef (m,2, p) … rot _ coef (m,8, p), are obtained; for a non-edge sliding window, determining a rotation coefficient corresponding to reference frequency points 5-8 (4 reference frequency points in total) at the center of the sliding window in the sliding window according to a corresponding phase linear fitting curve; for the edge sliding window P, it can be linear according to the corresponding phaseAnd fitting a curve, and determining rotation coefficients corresponding to the reference frequency points 5-12 (8 reference frequency points in total) at the center and the second edge of the sliding window. The above operation is repeated for each sliding window P of one channel, which is 1,2, …, and the rotation coefficient rot _ coef (m, n, P) corresponding to the reference frequency point in each sliding window is obtained.

In the embodiment of the invention, sliding window type phase linear fitting is carried out on the frequency domain signal to obtain a phase linear fitting curve corresponding to each sliding window; according to the phase linear fitting curve, phase fitting information of reference frequency points at the centers of the sliding windows (except for two edge sliding windows) in each sliding window is obtained, compared with the existing phase calibration algorithm, the edge effect generated in the conventional phase fitting process can be eliminated to a great extent, the fitting error is reduced, and therefore the calibration precision can be further improved.

And step 206, determining amplitude alignment information according to the frequency domain signal.

In the embodiment of the present invention, the measurement signal may include a plurality of measurement signals, one measurement signal corresponds to one channel, and each channel may transmit the measurement signal of the same frequency band; aiming at a set frequency point, determining the power corresponding to the set frequency point of the intermediate frequency domain signal of each channel by using, for example, a CORDIC algorithm, calculating the average value of the power, and performing amplitude alignment on the set frequency point of the intermediate frequency domain signal of each channel according to the average value of the power to obtain amplitude alignment information corresponding to the set frequency point; and repeating the operation of each set frequency point to obtain the amplitude alignment information corresponding to each set frequency point.

Wherein the amplitude leveling information may be determined with reference to the following steps:

and a substep 61, aiming at a set frequency point, determining the power corresponding to the set frequency point of the frequency domain signal in each channel.

Substep 62, calculating the average value of the power.

And a substep 63 of performing amplitude alignment according to the average value to obtain amplitude alignment information corresponding to the set frequency point of the intermediate frequency domain signal in each channel.

In an example of the present invention, the power of each set frequency point in each channel is calculated: pow (M, N) ═ H '(M, N) | ^2, wherein pow (M, N) represents the power of the set frequency point, H' (M, N) represents the frequency domain signal response corresponding to the set frequency point after noise suppression, M represents the mth channel, M is 1,2, …, M, N represents the nth set frequency point, and N is 1,2, …, N; calculating the average power of a set frequency point n according to the power of the set frequency point n in each channel (for example, as shown in fig. 3g, the power of the set frequency point 1 corresponding to channel 1 and channel 2 … in channel M): pow _ avg (n) mean (pow (M, n),1), where M1, 2, …, M, pow _ avg (n) represents the average power of the set frequency point n in each channel, mean (x) represents the averaging operation, and mean (pow (M, n),1) represents the average of the power pow (M, n) of the set frequency point in each channel; calculating amplitude alignment information (namely amplitude alignment factors) of the set frequency points according to the average power of the set frequency points: a (m, n) ═ sqrt (pow _ avg (n))/pow (m, n)), where a (m, n) represents the amplitude leveling factor of the set frequency point; the operation is repeated for each set bin, and the amplitude alignment factor a (m, N) of each set bin N is calculated as 1,2, …, N.

According to the embodiment of the invention, the amplitude alignment information of the set frequency points is calculated according to the average value of the power of the set frequency points in each channel; and determining the amplitude aligning information corresponding to each reference frequency point in the sliding window according to the amplitude aligning information of the set frequency points, so that the problem of excessively low amplitude calibration precision caused by the fact that the amplitude of a corresponding channel is reduced due to the abnormity of a part of channels when the minimum amplitude is aligned can be solved.

And step 207, aiming at one sliding window of one channel, determining the amplitude alignment information of other reference frequency points in the sliding window according to the amplitude alignment information of the set frequency points in the sliding window, wherein the other reference frequency points are reference frequency points which are not overlapped with the set frequency points in the sliding window.

In one example of the present invention, as shown in fig. 3f, the length of the sliding window is 3 × L Δ f, and each sliding distance is L Δ f, where Δ f is 4 × Δ f_res(i.e. L corresponds to a set frequency point, and a set frequency point corresponds to 4 reference frequency points, and the length of the sliding window is 3 × 4 — 12 reference frequency points), for one sliding window in one channel, for example, for sliding window 1 in channel m, sliding window 1 includes set frequency point 1 and set frequency point 1A fixed frequency point 2 and a set frequency point 3 (three set frequency points in total), wherein the set frequency point 1 is located in a first edge of the sliding window 1; setting a frequency point 2 to be positioned in the center of a sliding window 1; setting the frequency point 3 to be positioned in the second edge of the sliding window 1; according to step 206, a first amplitude alignment factor a (m,1), a second amplitude alignment factor a (m,2) and a third amplitude alignment factor a (m,3) (three amplitude alignment factors in total) corresponding to the set frequency point 1, the set frequency point 2 and the set frequency point 3 can be obtained respectively; aiming at 4 reference frequency points (namely, a reference frequency point 1, a reference frequency point 2, a reference frequency point 3 and a reference frequency point 4) on the first edge in the sliding window 1, because the reference frequency point 2 is superposed with the set frequency point 1, the amplitude alignment factor of the reference frequency point 2 is the first amplitude alignment factor a (m,1) of the set frequency point 1; for the reference frequency point 1, the reference frequency point 3 and the reference frequency point 4 which are not overlapped with the set frequency point in the sliding window 1, because the reference frequency point 1, the reference frequency point 3, the reference frequency point 4 and the set frequency point 1 are all reference frequency points on the first edge in the sliding window 1, the amplitude leveling factors of the reference frequency point 1, the reference frequency point 3 and the reference frequency point 4 can be set as a first amplitude leveling factor a (m,1) of the set frequency point 1; by analogy, the amplitude leveling factors of the reference frequency point 5, the reference frequency point 6, the reference frequency point 7 and the reference frequency point 8 corresponding to the sliding window center of the sliding window 1 may be a second amplitude leveling factor a (m,2) of the set frequency point 2; and repeating the operation to determine the amplitude aligning factors of other corresponding reference frequency points in each sliding window.

In the embodiment of the present invention, other manners may also be adopted to determine the amplitude alignment information of each other reference frequency point in the sliding window according to the amplitude alignment information of each set frequency point in the sliding window, which is not limited in this regard.

And 208, determining the calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window.

In the embodiment of the invention, aiming at one reference frequency point, the amplitude alignment information of the reference frequency point is multiplied by the phase fitting information of the reference frequency point to obtain the calibration information of the reference frequency point.

In an example of the present invention, for a sliding window P in a channel m, a rotation coefficient rot _ coef (m,1, P) corresponding to a reference frequency point 1 can be obtained according to step 203 and step 207, an amplitude alignment factor a (m,1) corresponding to the reference frequency point 1 can be obtained according to step 206 and step 207, and calibration information (i.e., calibration factor) of the reference frequency point 1 in the sliding window P is ac _ coef (m,1, P) ═ a (m,1) × ot _ coef (m,1, P). Repeating the operation, as shown in fig. 3h, obtaining calibration factors corresponding to reference frequency points 1-8 (8 reference frequency points in total) at the first edge and the sliding window center in the edge sliding window 1, calibration factors corresponding to reference frequency points 5-8 (4 reference frequency points in total) at the sliding window center in each non-edge sliding window, and calibration factors corresponding to reference frequency points 5-12 (8 reference frequency points in total) at the sliding window center and the second edge of the edge sliding window P.

And 209, splicing the calibration information of the reference frequency points in each sliding window to obtain calibration information corresponding to the channel.

In the embodiment of the present invention, as shown in fig. 3h, for a channel, calibration factors corresponding to reference frequency points 1 to 8 in an edge sliding window 1 (8 reference frequency points in total), calibration factors corresponding to reference frequency points 5 to 8 in each non-edge sliding window (4 reference frequency points in total), and calibration factors corresponding to reference frequency points 5 to 12 in an edge sliding window P (8 reference frequency points in total) are spliced to obtain calibration factors corresponding to the channel, that is, calibration factors corresponding to all reference frequency points of the signal to be calibrated. And repeating the operation on each channel to respectively obtain the calibration factor corresponding to each channel so as to carry out combined calibration on the phase and the amplitude of the signal to be calibrated corresponding to each channel.

In another embodiment of the present invention, for a channel, the rotation coefficients corresponding to reference frequency points 1 to 8 (8 total reference frequency points) in the edge sliding window 1, the rotation coefficients corresponding to reference frequency points 5 to 8 (4 total reference frequency points) in each non-edge sliding window, and the rotation coefficients corresponding to reference frequency points 5 to 12 (8 total reference frequency points) in the edge sliding window P may be spliced to obtain the rotation coefficients corresponding to the channel; after splicing, multiplying the rotation coefficient corresponding to each reference frequency point by the amplitude alignment factor corresponding to each reference frequency point to obtain the calibration information corresponding to each reference frequency point in the channel.

In the embodiment of the invention, sliding window type phase linear fitting is carried out on the frequency domain signal to obtain a phase linear fitting curve corresponding to each sliding window; and according to the phase linear fitting curve, the rotation coefficient of the reference frequency point at the center of the sliding window (except for two edge sliding windows) in each sliding window is obtained, and compared with the existing phase calibration algorithm, the method can eliminate the edge effect generated during conventional phase fitting to a great extent, reduce the fitting error and further improve the calibration precision.

In addition, the embodiment of the invention calculates the amplitude aligning information of the set frequency points according to the average value of the set frequency point power in each channel, and can avoid the problem of low amplitude calibration precision caused by the fact that the amplitude of a corresponding channel is reduced due to the abnormity of a part of channels when the minimum amplitude aligning is adopted.

It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.

Referring to fig. 4, a block diagram of an embodiment of the apparatus for determining calibration information according to the present invention is shown, which may specifically include the following modules:

a signal receiving module 401, configured to receive a measurement signal at a receiving end, where the measurement signal corresponds to N set frequency points, and the set frequency points are determined according to a reference frequency interval of a signal to be calibrated;

a channel estimation module 402, configured to perform channel estimation on the measurement signal to determine a frequency domain signal;

an amplitude alignment information determining module 403, configured to determine amplitude alignment information according to the frequency domain signal;

a phase fitting module 404, configured to perform sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window, where one sliding window includes M set frequency points, where M is less than N;

a calibration information determining module 405, configured to determine calibration information according to the amplitude alignment information and the phase fitting information, where the calibration information is used to perform joint calibration on the phase and the amplitude of the signal to be calibrated; wherein M and N are positive integers.

Referring to fig. 5, a block diagram of an alternative embodiment of an apparatus for determining calibration information of the present invention is shown.

In an optional embodiment of the present invention, the measurement signal comprises a plurality of signals, one measurement signal corresponds to one channel;

the amplitude alignment information determination module 403 includes:

a power determining submodule 4031, configured to determine, for a set frequency point, a power corresponding to the set frequency point of the intermediate frequency domain signal in each channel;

an average power calculation sub-module 4032 for calculating an average of the power;

and the amplitude aligning submodule 4033 is configured to perform amplitude aligning according to the average value to obtain amplitude aligning information corresponding to the set frequency point of the intermediate frequency domain signal of each channel.

In an alternative embodiment of the present invention, the phase fitting module 404 includes:

the sliding submodule 4041 is configured to slide on the frequency domain signal according to a set step length by using a target window for one channel, so as to obtain a plurality of sliding windows;

a phase fitting curve determination submodule 4042, configured to determine, for one sliding window, a phase linear fitting curve of the sliding window;

and the phase fitting information determining submodule 4043 is configured to determine the phase fitting information of the sliding window according to the phase linear fitting curve.

In an optional embodiment of the present invention, the phase fitting curve determining submodule 4042 is configured to determine the phase of each set frequency point in the sliding window; determining a fitting slope and an initial phase according to the phase; and determining a phase linear fitting curve of the sliding window according to the fitting slope and the initial phase.

In an optional embodiment of the present invention, the phase fitting curve determining submodule 4042 is specifically configured to determine the phase difference between adjacent set frequency points in the sliding window and the average value of the phase difference; determining a ratio of a set frequency interval of the measurement signal to the reference frequency interval; determining a fitting slope according to the average value and the ratio of the phase difference;

the phase fitting curve determining submodule 4042 is specifically configured to average the phases in the sliding window to obtain an initial phase.

In an optional embodiment of the present invention, the phase fitting information determining sub-module 4043 is configured to determine a frequency band corresponding to the sliding window; determining reference frequency points in the sliding window according to the frequency band of the sliding window and the reference frequency interval, wherein the reference frequency points comprise set frequency points which are overlapped with the set frequency points; and determining phase fitting information corresponding to each reference frequency point in the sliding window according to the phase linear fitting curve and the reference frequency point in the sliding window.

In an optional embodiment of the present invention, the calibration information determining module 405 is configured to determine, for a sliding window of a channel, amplitude alignment information of other reference frequency points in the sliding window according to the amplitude alignment information of each set frequency point in the sliding window, where the other reference frequency points are reference frequency points that do not coincide with the set frequency points in the sliding window; determining calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window; and splicing the calibration information of the reference frequency points in each sliding window to obtain calibration information corresponding to the channel.

In an optional embodiment of the present invention, the calibration information determining module 405 is specifically configured to, for a reference frequency point, multiply the amplitude alignment information of the reference frequency point by the phase fitting information to obtain the calibration information of the reference frequency point.

For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The method for determining calibration information and the apparatus for determining calibration information provided by the present invention are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, and the descriptions of the above embodiments are only used to help understand the method and the core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method of determining calibration information, comprising:

a receiving end receives a measuring signal, wherein the measuring signal corresponds to N set frequency points, and the set frequency points are determined according to the reference frequency interval of a signal to be calibrated;

performing channel estimation on the measurement signal to determine a frequency domain signal;

determining amplitude alignment information according to the frequency domain signal;

performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window, wherein one sliding window comprises M set frequency points, and M is less than N;

determining calibration information according to the amplitude alignment information and the phase fitting information, wherein the calibration information is used for carrying out combined calibration on the phase and the amplitude of the signal to be calibrated;

wherein M and N are positive integers.

2. The method of claim 1, wherein the measurement signal comprises a plurality of signals, one measurement signal for each channel;

the step of determining amplitude alignment information according to the frequency domain signal includes:

aiming at a set frequency point, determining the power corresponding to the set frequency point of the intermediate frequency domain signal of each channel;

calculating an average of the power;

and carrying out amplitude alignment according to the average value to obtain amplitude alignment information corresponding to the set frequency point of the intermediate frequency domain signal of each channel.

3. The method according to claim 2, wherein the step of performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window comprises:

for one channel, sliding a target window on the frequency domain signal according to a set step length to obtain a plurality of sliding windows;

for one sliding window, determining a phase linear fitting curve of the sliding window;

and determining the phase fitting information of the sliding window according to the phase linear fitting curve.

4. The method of claim 3, wherein the step of determining a phase linear fit curve for the sliding window comprises:

determining the phase of each set frequency point in the sliding window;

determining a fitting slope and an initial phase according to the phase;

and determining a phase linear fitting curve of the sliding window according to the fitting slope and the initial phase.

5. The method of claim 4,

the step of determining a fitted slope from the phase comprises:

determining the phase difference of adjacent set frequency points in the sliding window and the average value of the phase difference;

determining a ratio of a set frequency interval of the measurement signal to the reference frequency interval; the set frequency interval is the distance between two adjacent set frequency points;

determining a fitting slope according to the average value and the ratio of the phase difference;

the step of determining an initial phase from the phase comprises:

and averaging the phases in the sliding window to obtain an initial phase.

6. The method of claim 3, wherein the step of obtaining phase fitting information of the sliding window according to the phase linear fitting curve comprises:

determining a frequency band corresponding to the sliding window;

determining reference frequency points in the sliding window according to the frequency band of the sliding window and the reference frequency interval, wherein the reference frequency points comprise set frequency points which are overlapped with the set frequency points;

and determining phase fitting information corresponding to each reference frequency point in the sliding window according to the phase linear fitting curve and the reference frequency point in the sliding window.

7. The method of claim 6, wherein said step of determining calibration information from said amplitude alignment information and said phase fitting information comprises:

aiming at a sliding window of a channel, determining the amplitude alignment information of other reference frequency points in the sliding window according to the amplitude alignment information of all set frequency points in the sliding window, wherein the other reference frequency points are reference frequency points which are not overlapped with the set frequency points in the sliding window;

determining calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window;

and splicing the calibration information of the reference frequency points in each sliding window to obtain calibration information corresponding to the channel.

8. The method according to claim 7, wherein the step of determining the calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window comprises:

and aiming at one reference frequency point, multiplying the amplitude alignment information of the reference frequency point by the phase fitting information to obtain the calibration information of the reference frequency point.

9. An apparatus for determining calibration information, comprising:

the signal receiving module is used for receiving a measuring signal by a receiving end, wherein the measuring signal corresponds to N set frequency points, and the set frequency points are determined according to the reference frequency interval of the signal to be calibrated;

the channel estimation module is used for carrying out channel estimation on the measurement signal and determining a frequency domain signal;

the amplitude alignment information determining module is used for determining amplitude alignment information according to the frequency domain signal;

the phase fitting module is used for performing sliding window type phase linear fitting on the frequency domain signal to obtain phase fitting information corresponding to each sliding window, wherein one sliding window comprises M set frequency points, and M is less than N;

the calibration information determining module is used for determining calibration information according to the amplitude alignment information and the phase fitting information, wherein the calibration information is used for performing combined calibration on the phase and the amplitude of the signal to be calibrated;

wherein M and N are positive integers.

10. The apparatus of claim 9, wherein the measurement signal comprises a plurality of signals, one measurement signal for each channel;

the amplitude alignment information determination module includes:

the power determining submodule is used for determining the power corresponding to the set frequency point of the intermediate frequency domain signal of each channel aiming at one set frequency point;

the average power calculation submodule is used for calculating the average value of the power;

and the amplitude aligning submodule is used for carrying out amplitude aligning according to the average value to obtain amplitude aligning information corresponding to the set frequency point of the intermediate frequency domain signal of each channel.

11. The apparatus of claim 10, wherein the phase fitting module comprises:

the sliding submodule is used for sliding on the frequency domain signal by adopting a target window according to a set step length aiming at one channel to obtain a plurality of sliding windows;

the phase fitting curve determination submodule is used for determining a phase linear fitting curve of a sliding window aiming at the sliding window;

and the phase fitting information determining submodule is used for determining the phase fitting information of the sliding window according to the phase linear fitting curve.

12. The apparatus of claim 11,

the phase fitting curve determining submodule is used for determining the phase of each set frequency point in the sliding window; determining a fitting slope and an initial phase according to the phase; and determining a phase linear fitting curve of the sliding window according to the fitting slope and the initial phase.

13. The apparatus of claim 12,

the phase fitting curve determining submodule is specifically used for determining the phase difference of adjacent set frequency points in the sliding window and the average value of the phase difference; determining a ratio of a set frequency interval of the measurement signal to the reference frequency interval; determining a fitting slope according to the average value and the ratio of the phase difference; the set frequency interval is the distance between two adjacent set frequency points;

and the phase fitting curve determining submodule is specifically used for averaging the phases in the sliding window to obtain an initial phase.

14. The apparatus of claim 11,

the phase fitting information determining submodule is used for determining a frequency band corresponding to the sliding window; determining reference frequency points in the sliding window according to the frequency band of the sliding window and the reference frequency interval, wherein the reference frequency points comprise set frequency points which are overlapped with the set frequency points; and determining phase fitting information corresponding to each reference frequency point in the sliding window according to the phase linear fitting curve and the reference frequency point in the sliding window.

15. The apparatus of claim 14,

the calibration information determining module is used for determining the amplitude alignment information of other reference frequency points in a sliding window according to the amplitude alignment information of each set frequency point in the sliding window aiming at the sliding window of one channel, wherein the other reference frequency points are reference frequency points which are not overlapped with the set frequency points in the sliding window; determining calibration information of each reference frequency point in the sliding window according to the amplitude alignment information and the phase fitting information of each reference frequency point in the sliding window; and splicing the calibration information of the reference frequency points in each sliding window to obtain calibration information corresponding to the channel.

16. The apparatus of claim 15,

the calibration information determining module is specifically configured to, for a reference frequency point, multiply amplitude alignment information of the reference frequency point by phase fitting information to obtain calibration information of the reference frequency point.